Product Data

Wide Range Measuring Amplifiers — Types 2610 and 2636USES:

IEC651 Type 0 precision sound level meter with Brüel&Kjær 1/2-inch Condenser Microphones

Versatile vibration meter with Brüel&Kjær piezoelectric accelerometers and other vibration transducers

Wide-range, high-accuracy voltmeter. Max.Hold for capture and display of short duration signal levels

Low-noise amplifier with calibrated gain, selectable from –30 to +100dB, and built-in calibration source

Frequency analyzer with Brüel&Kjær Band Pass Filters

COMMON FEATURES:

Overall frequency range from 1Hz up to 200kHz Measuring ranges from 10µV to 30V FSD (300V

with 10:1 input probe) selectable in 10dB steps Interchangeable meter scales for sound, vibration

and voltage measurements etc. Automatic indication of measurement mode, range,

gain, and input and output overload Direct, plus Mic. Preamp. Input with 0; 28 and 200V

microphone polarization Wide-range analog AC and DC outputs for magnetic

FEATURES 2610:

Accurate true RMS indication for AC signals with crest factors up to 10 (up to 20 below FSD)

Selectable “Fast”, “Slow” and “20s” RMS averaging

Max.Hold mode for RMS and Peak measurements. Max.Peak indication with signals of 25 µs or longer

22.4Hz high-pass and “A”-weighting networks

FEATURES 2636:

Accurate true RMS and Impulse indications for AC signals with crest factors up to 10 (50 below FSD)

Selectable “Fast”, “Slow” and 0.1 to 30s RMS averaging. Auto-control via Band Pass Filter Type 1617

Accurate +Peak, –Peak and Max.Peak indications with signals of 8µs or longer

Max.Hold mode for RMS, Impulse and Peak measurements

Log and Lin meter display and DC output modes

Selectable 22.4Hz high-pass, 22.4kHz low-pass, plus “A”-, “B”-, “C”- and “D”-weighting networks

IEC-625-1/IEEE-488 compatible digital interface bus for digital read-out and control

2610

Automatic self-test mode

tape and graphic recording

Introduction

The Brüel&Kjær Measuring Amplifi-ers Types 2610 and 2636 are two easyto use, multi-purpose, calibrated am-plifier-voltmeters, featuring extremeversatility, a wide measurementrange and laboratory precision. Theymay be used alone, or as the basisaround which numerous measure-ment and analysis set-ups may bebuilt for comprehensive and detailedinvestigation of sound, vibration andvoltage signals.

The two Measuring Amplifiers areessentially similar. However, Type2636 has a variety of extra facilitiesincluding a digital interface buswhich greatly expand its range of

Brüel & Kjær B K

2636measurement applications and uses.Both Measuring Amplifiers feature

Ref. Oscillator

Direct Input

Input Selector

and Attenuator

Input Overload Detector x 5 or 10

Input Amplifiers

Internal Filter

Selection

Output Amplifiers

Recorder Amplifier

To Detector Amplifier

AC OutputAC Output

2610 22.4 Hz "A" Weight 2636 22.4 Hz 22.4 kHz "A", "B", "C" and "D" Weight

Output200 V

28 V

0 VFrom Ext. Filter

Input

Direct Sens.

Preamp. Sens.

Input Gain

Ext. Filter Selector

+ Buffer

Amplifier

Output Overload Detector

x 10

Front Panel Controls, Steering, Range Calculating and Indicating CircuitryFront Panel Controls, Steering, Range Calculating and Indicating Circuitry

Fig.1 Input and Output AC Amplifier Sections of Measuring Amplifiers Types 2610 and 2636

interchangeable meter scales permit-ting direct reading of measuredsound, vibration and voltage levels.They are also equipped with indicat-ing lights which show the particularmeasurement mode, range and gainsettings selected, as well as warn ofinput and output overload.

When used with one of a variety ofBrüel&Kjær 1/2-inch Condenser Mi-crophones and Preamplifiers availa-ble, Types 2610 and 2636 serve as aprecision sound level meter meetingthe strictest international and na-tional standards for precision soundlevel measuring instrumentation.Type 2610 conforms with IEC 651

addition, Type 2636 conforms to “Im-pulse” sound measurement require-ments of IEC and DIN.

Description

Operation and principle features ofthe 2610 and 2636 are discussed withreference to the simplified block dia-gram of the instruments shown inFigs.1 and 2.

Multi-purpose InputsTypes 2610 and 2636 are furnishedwith two alternative AC coupled sig-

al plugs and is used for voltage andvibration measurements etc., and aPreamp. Input which accepts the 7-pin plug of Brüel&Kjær MicrophonePreamplifiers for sound measure-ments. Both inputs have a high inputimpedance of 1 MΩ and can with-stand voltage overloads as high as220 V RMS (400 V Peak including DCcomponent) without damage.

Besides serving as a signal input,the Preamp. Input supplies stabilizedvoltages for powering MicrophonePreamplifiers. Furthermore it may beswitched to provide +28 and +200Vpolarization necessary for operationof condenser microphones. A “0V” po-

800007/1e

Preamp. Input

Pol. Volt.

1.6 V FSD-2610 5 V FSD-2636

1 V FSD

(Type 0), DIN 45633 (Part 1) andANSI S14-1983 (Type 1), whilst, in

nal inputs — a Direct Input whichaccepts standard Brüel&Kjær coaxi-

larization setting is also available forprepolarized types of microphone.

+5

+10dB

0

–5

–10

–15

–20

–25

–30

–35

Linear 2 Hz to 200kHzLinear 2 Hz to 200kHz

AC and DC Outputs

22.4 Hz High Pass 18 dB/oct.

"A" Weighting AC (1.6 V FSD) DC (5 V FSD)

Outputs

"A" Weighting

790469/1e

1 10 100 1k2 5 20 50 200 500 2k 5k0.2 0.5 10k 20k 50k 100k 200k 500kFrequency Hz

1M

2

Fig.3 Typical overall frequency response of Measuring Amplifier Type 2610, with and without internal filter and weighting networksselected

Peak Rise Time

2610 1.7 dB/µs

2610 "Fast" "Slow"

20 s 2636

"Fast" "Slow"

0.1 to 30 s "Impulse"

2610 "Log" 2636 "Log" "Lin"

Normal Hold Reset

DC Output

IEC Digital

Interface Bus 2636 only

Digital Processor

+ Analog

to Digital

Converter 2636 only

Meter +

Range Indicators

DC Amplifier

+ Hold

Circuit

Log - Lin Converter 2636 only

IntegratorPeak

DetectorLog

RectifierDetector Amplifier

2610 RMS

Max. Peak 2636 RMS

+ Peak – Peak

Max. Peak Impulse

Band Pass Filter 2636 only

Averaging Time

Control 2636 only

From Recorder Amplifier

Front Panel Controls, Steering, Range Calculating and Indicating CircuitryFront Panel Controls, Steering, Range Calculating and Indicating Circuitry

Fig.2 Rectifier and Meter Sections of Measuring Amplifier Type 2610, plus Digital Processing section of Measuring Amplifier Type 2636

To facilitate use of a wide range ofmeasurement transducers of differ-ent sensitivity, the Direct andPreamp. Inputs are each equippedwith their own individual, screwdriv-er accessible, sensitivity adjustment.These adjust the gain of the inputsection amplifier and together with abuilt-in 50mV, 1kHz sinusoidal refer-ence source, enable the MeasuringAmplifiers to be quickly and easilycalibrated to give a direct meter read-ing for sound, vibration and voltagemeasurements, etc. Apart from elim-inating the need of using an externalreference for calibration, the internal

cording equipment which may beused with the Measuring Amplifiers.

Input and Output AmplifiersThe particular combination of cascad-ed amplifier and attenuator stagesused with the input and output am-plifier sections of the 2610 and 2636,gives them particularly good signalamplification linearity plus very lownoise and distortion (see CommonSpecifications). Their nominal overallamplification and attenuation is from+100 to – 30dB and may be switchedin accurate 10dB steps to give voltagemeasurement ranges from 10µV to30V for full scale meter deflection.

Gain knobs and one at the bottom ofthe meter, automatically indicatewhich particular gain settings andmeasurements range have been se-lected.

As with most front panel controlsettings, the input and output sectiongain may be switched remotely. Withthe 2610 a remote switching arrange-ment may be connected via two mul-tipin sockets inside the instrument,whilst with the 2636 switching maybe conducted using a computer con-nected via the Digital Interface sock-et on the rear panel.

To facilitate measurement of verylow signal levels, possibly in conjunc-

800008/1e

2636 5; 0.5; 0.05 dB/µs

5 V FSD

reference voltage is ideal for calibrat-ing magnetic tape and graphic re-

Three rows of indicator lamps, twobeside the Input and Output Section

tion with external filters, an extra 0to +10dB of continuous gain adjust-

+10

+15dB

+5

+0

–5

–10

–15

–20

–25

–30

Linear 1 Hz to 200kHz Linear 1 Hz to 200kHz

AC and DC Outputs

(5V FSD)

AC and DC Outputs

(5V FSD)

22.4 Hz High Pass 30 dB/oct.

22.4 kHz Low Pass 30 dB/oct.

B + C

D

D–AABDC

1 10 100 1k2 5 20 50 200 500 2k 5k0.2 0.5 10k 20k 50k 100k 200k 500k 1M

800048/1e

Frequency Hz

3

Fig.4 Typical overall frequency response of Measuring Amplifier Type 2636, with and without internal filter and weighting networksselected

“Max. Peak” indicating modes areavailable with the 2636. To accommo-

+20

+10

0

–10

–20

–30

–40

Sig

nal L

evel

re

FS

D (

dB)

± 0.2 dB

± 0.5 dB

+ 0.7

the RMS Detector of the 2610 and 2636

+20

+10

0

–10

–20

–30Sig

nal L

evel

re

FS

D (

dB)

± 0.2 dB

± 0.5 dB

± 0.5 dB

± 0.4 dB

± 2

±1 dB

ment is available via a separate knob.Alternatively for measurement of sig-nals with voltage levels up to 300VRMS or Peak, extra attenuation maybe obtained using a 10:1 Input ProbeZC0016 and BNC Adaptor JP0144with the Direct Input of the Measur-ing Amplifiers. These are supplied asstandard accessories with the 2636.

Overload WarningFor a reliable overload warning, theinput and output amplifier sectionshave separate overload detectors.These are of particular help when us-ing weighting networks or externalfilters with the Measuring Amplifi-ers, as overload by signals outside thefilter pass band can sometimes pro-duced a misleading meter indication,which without the benefit of overloaddetectors might not be interpreted asoverload.

The two overload detectors respondto positive and negative going signalspeaks as short as 200µs and whentriggered cause the appropriate Inputand (or) Output Section Gain lightsto flash. The lights continue to flashfor a minimum of 0.5 seconds, thusenabling very short duration over-loads to be spotted.

To suit different maximum inputvoltage requirements, the input over-load trigger level may be switched sothat it is equivalent to 5 or 10 timesthe particular voltage range selectedfor measurements. These correspondto a maximum input voltage ratingof 5 or 10V peak at the input of anexternal filter.

Filter SectionThe overall frequency characteristicsof the 2610 and 2636 are shown inFigs.3 and 4 respectively. Both Meas-uring Amplifiers are equipped with a22.4Hz high-pass filter and an “A”-weighting network. In addition the2636 includes a 22.4kHz low-pass fil-ter plus “B”-, “C”- and “D”-weightingnetworks.

Whereas either one or both of thehigh- and low-pass filters may be se-lected, only one of the weighting net-works may be used at any one time.The weighting networks are intendedfor sound measurements and complywith Type 0 requirements of IEC 651for precision sound level meters. Thehigh- and low-pass filters on the oth-er hand, are useful for all types ofmeasurement covering the audio fre-

frequency environmental disturbanc-es on measurements.

If required the Measuring Amplifi-ers may be connected with externalfilters for frequency analysis. Thesemay be used with or without the in-ternal filters and weighting networksselected and permit detailed investi-gation of the frequency compositionof signals. See “Examples of Use”.

Rectifier and Meter Section – 2610The 2610 has a logarithmic meter re-sponse with true RMS and Max. Peakindicating modes. All commonly en-countered signals can be measuredincluding those with complex wave-forms. A wide range Log. Rectifierwith dynamic range of 70dB is usedto perform the necessary signal rec-tification which with subsequentprocessing by a special integrator cir-cuit provides a true RMS meter indi-cation with overall accuracy of± 0.5dB (± 0.2dB typical — see Fig.5).Signals with crest factors up to 10can be handled at full scale, increas-ing to 20 for lesser deflections.

The integrator has selectable timeconstants enabling “Fast” and “Slow”time weighting characteristics in ac-cordance with Type 0 requirementsof IEC 651 for precision sound levelmeters to be selected. In addition a“20s” effective averaging time may bechosen which is beneficial for meas-urements and analyses using narrowband filters with the 2610.

For a peak indication, the Log rec-tified signal is applied to a separatePeak Detector, having a dynamicrange of 60dB. This detects the max-imum peak value (positive or nega-tive, whichever is the greatest) of theinput signal and has a typical riseand decay rate of 1.7dB/µs and 40dB/s respectively.

To facilitate measurement of veryshort duration transient signals andsingle events a “Hold” mode may beselected. This permits the maximumPeak or maximum RMS level of thesignal to be captured and displayedon the meter. Using the Peak Holdmode for example, signals as short as25 µs may be measured which have apeak excursion of 40 dB or less.

Rectifier and Meter Section – 2636This is similar to that included in the2610, but has a number of extra fea-tures, including a selectable Lin –Log response. For RMS measure-ments the same 70dB dynamic range

4

quency range and help reduce the in-fluence of unwanted low and high

and ± 0.5 dB overall (± 0.2dB typical)indication accuracy are available,

plus a crest factor allowance of 10 atfull scale. With reduced meter deflec-tions, however, signals with crest fac-tors of more than 50 can be handled,in contrast to 20 with the 2610.

In addition to “Fast” and “Slow”time weighting functions there is an“Impulse” mode. This includes a35 ms time constant and is for meas-urement of the maximum RMS levelof impulsive sounds in accordancewith IEC 651. Also included for RMSmeasurements are a choice of timeconstants for precise averaging of sig-nals when external filters are em-ployed for frequency analysis. Sixaveraging time settings from 0.1 to30 s are available, which if requiredmay be selected remotely via the Av-eraging Time or Digital Interfacesocket on the rear panel. This featureis of major benefit when using an Oc-tave and Third Octave Band Pass Fil-ter Type 1617 with the 2636, possiblytogether with a computer. See “Ex-amples of Use”.

For comprehensive measurementof peak levels, “+Peak”, “–Peak” and

800016/1e

–502 20 200

Frequency (Hz)2k 50k

–0dB

200k

Fig.5 Typical measurement accuracy of

800017/2e

–502 20 200

Frequency (Hz)

± 1 dB

2k 50k

dB

200k

Fig.6 Typical measurement accuracy ofthe Peak Detector of the 2610 and 2636

scale for direct reading of measured

date for different types of signal, in-dependent selection of 5; 0.5 and0.05dB/µs rise rates plus “Fast”,“Slow” and “0.5s Hold” decay func-tions is possible, which if desired canbe set to ignore unwanted high fre-quency noise spikes and overshootcomponents.

Like the 2610, the 2636 has a“Hold” mode whereby the maximumPeak, RMS or Impulse level of shortduration signals and single eventsmay be captured and displayed. Inthis case, however, signals as shortas 8 µs may be measured which havea peak excursion of 40 dB. For meas-urements over the full 60 dB dynamicrange of the Peak Detector, signals asshort as 12 µs may be measured.

Indicating MeterBoth Measuring Amplifiers include arow of range indicating lights at thebottom of their meter and are sup-plied with interchangeable scaleswhich are calibrated for direct read-ing of measured sound, vibration andvoltage levels. With the 2610 the me-ter has a fixed 30dB Log displayrange, whilst with the 2636 separatesettings for selection of Lin, 30dBLog and 60dB Log display ranges areavailable, which are indicated bylights at the top of the meter.

Besides the meter scales supplied,a variety of other interchangeablescales are available, including typesfor sound absorption and underwatersound measurements. Scales forsound measurement are furnishedwith a K-factor range whereby the

sound, vibration and voltage levels

Measuring Amplifiers may be cali-brated for different microphone sen-

sitivities using their internalreference voltage. If required specialscales can be made to order, or madeusing the Blank Scales SA 0082(2610) and SA 0280 (2636) which areavailable. For a complete list ofscales, ask for a “General Accesso-ries” Product Data.

Analog OutputsFor feeding magnetic tape as well aslevel and X-Y recording equipment,there are two AC and one DC cali-brated signal outputs from the Meas-uring Amplifiers. The AC Outputsprovide an amplified (and if connect-ed filtered) version of the input sig-nal, whilst the DC Output producesa rectified, time-weighted, DC volt-age proportional to the meter deflec-tion on the Measuring Amplifiers.The maximum signal-to-noise ratio ofthe AC Outputs is 100dB. Similarlyfor RMS and Impulse measurementsthe maximum dynamic range of theDC Output is approximately 70dB,while for peak measurements it is60dB.

Digital Interface – 2636Supplementing the analog outputs ofthe 2636 is a Digital Interface bus.This conforms to IEC 625-1 for pro-grammable measuring apparatusand is for output of measurement re-sults transmitted by a 10-bit A/DConverter in the instrument. Resultscan be sent at 10 ms intervals andare transmitted in printer or calcula-tor format suitable for application toa computer or other digital equip-ment having an IEC 625-1 or IEEE-488 compatible interface.

Besides output of measurement re-sults, information can be sent aboutwhich front panel control settings areselected. If required these settingsmay be controlled remotely via a com-puter, thus permitting fully automat-ic operation of the 2636. Controllights on the front panel of the Meas-uring Amplifier automatically showwhich control settings are chosen atany given instant.

Also shown by the control lights isthe status of the IEC interface. Theseindicate whether the 2636 is underremote control, requests service(SRQ) or is a Listener or Talker.When in “Talk Only” the start andstop of a read-out can be controlledmanually using the Read-Out switchof the instrument or may be control-

In addition to a special program forautomatic operation with theBrül&Kjær Band Pass Filter Type1617 (See “Examples of Use”) includ-ing read-out of measurement resultsand filter centre frequency to a print-er etc., a program is provided for au-tomatic self-test of the 2636. Thisprovides a basic check of most analogfunctions available with the frontpanel control switches and tests theattenuator and detector linearity, fil-ter throughput and noise, as well asthe detector time constants. If a faultis detected, then a warning is provid-ed and a print out of the fault can beobtained. The total check out time isapproximately 3 minutes.

Examples of Use

There are many applications of theBrüel&Kjær Measuring Amplifiers.They can be used alone for accuratespot measurements on voltage sig-nals, including very short durationtypes with high crest factors and fastslew rates; or they can be used asamplifiers where a wide choice of cal-ibrated gain settings and high signal-to-noise ratio are required. They mayalso be used for comprehensive meas-urement in acoustics, electroacousticsand in shock and vibration investiga-tions etc., for which Brüel&Kjær pro-duce an extensive range of accessoryequipment including transducers.

For detailed investigation of sound,vibration and voltage signals, the2610 and 2636 can be coupled withan external filter enabling discrete orswept frequency analysis to be per-formed. Suitable types of filter areshown in Fig.8. For AC or DC graphicrecording of the analysis, aBrüel&Kjær Level or X-Y Recordercan be used, thereby enabling theanalysis to be performed entirely au-tomatically with synchronous switch-ing or tuning of the filter centrefrequency.

An important advantage of DC re-cording is that averaging of the signalis performed by precise electrical R-C time constants in the MeasuringAmplifiers. This is of particular valuewhen using the 2636 Measuring Am-plifier with the 1617 Octave andThird Octave Band Pass Filter. Withthis instrument combination analy-ses can be performed entirely auto-matically with the 1617 stepping the

Fig.7 Insertion of interchangeable meter

5

led from an external clock in a com-puter or printer, for example.

Measuring Amplifier averaging timeduring the course of the analysis. For

IEC/IEEE Interface

Bus

Measuring Amplifier 2636/WH 1769

Test Head 4602 with Mouth Simulator 4227

and Ear Simulator for

Telephonometry 4185

Telephone Interface 5906

DOS 6.0 PC

Sine Generator 1051

this purpose the 1617 has a numberof averaging time programs which se-lect the appropriate averaging time.The appropriate averaging time ischosen on the basis of keeping theoverall analysis time as short as pos-sible, whilst maintaining a good over-all confidence level for the analysis.This saves considerable time espe-cially when low frequency signalshave to be analysed.

Another way of processing and doc-umenting results is by digital means.For this purpose the 2636 can be usedto supply data in digital form to acomputer and/or alphanumeric print-

Fig.8 Configuration of Basic Telephone Test

6

er. Besides allowing large amounts ofdata to be quickly processed, a com-

puter can be used to control whichparticular measurement range, filter,detector, averaging time etc. is select-ed on the 2636, thus enabling a seriesof repetitive measurements, frequen-cy analyses and production-line prod-uct checks to be performed entirelyautomatically.

The Type 2636 is also an integralpart of the Basic Telephone TestBench Type 6702 which is based onElectroacoustic Test Software Type5302 (see Fig.8).

The ETS software is a high-levelapplications program which controlsmeasurements, performs post-

ment. Pop-up menus simplify the cre-ation of test Sequences. Thesesystems are equally suited for bothdevelopment and quality-control ap-plications.

Typical measurement results in-clude frequency response, sensitivity,Loudness Rating, distortion, imped-ance and polarity. A check againsttolerance limits resulting in a pass/fail indication can also be performed.

The Basic Telephone Test BenchType 6702 is particularly well suitedfor testing telephones and loudspeak-ers, as the software controls the nec-essary electrical and acoustical

Bench Type 6702 controlled by a PC

950875e

processing, creates displays andstores results in a flexible environ-

interfaces to these measurement ob-jects.

Approximately 100dB in “100mV” reference po-sition

COMPLIANCE WITH STANDARDS:

CE-mark indicates compliance with: EMC Directive and Low Voltage Directive.

Safety EN 61010–1 and IEC 1010–1: Safety requirements for electrical equipment for measurement, control and laboratory use.

EMC Emission EN 50081–1: Generic emission standard. Part 1: Residential, commercial and light industry.CISPR 22: Radio disturbance characteristics of information technology equipment. Class B Limits.FCC Rules, Part 15: Complies with the limits for a Class B digital device.

EMC Immunity EN 50082–1: Generic immunity standard. Part 1: Residential, commercial and light industry.Note 1: The above is guaranteed using accessories listed in this Product Data sheet only.Note 2: Susceptibility to radiated RF (3 V/m, 80% AM): Input noise in all bandwidths up to 120 µV (2610), 38 µV (2636).

Temperature IEC 68–2–1 & IEC 68–2–2: Environmental Testing. Cold and Dry Heat.Operating Temperature: 5 to 40°C (41 to 104°F)Storage Temperature: –25 to +70 °C (–13 to 158°F)

Humidity IEC 68–2–3: Damp Heat: 90% RH (non-condensing at 30°C (86°F))

Mechanical Non-operating:IEC 68–2–6: Vibration: 0.3 mm, 20 m/s2, 10–500 HzIEC 68–2–27: Shock: 1000 m/s2

IEC 68–2–29: Bump: 1000 bumps at 250 m/s2

AMPLIFIER RESPONSE:Measuring Ranges:10µV to 30V FSD with LED indication of partic-ular meter range selected. 100µV to 300V with10:1 Attenuator Probe ZC0016 supplied with2636Frequency Range (without filters):2Hz to 200kHz (±0.5dB) – 2610 only1Hz to 200kHz (±0.5dB) – 2636 only10Hz to 50kHz (±0.2dB) – 2610:2636Phase Deviation (without filters):±5° between any two 2610’s or 2636’s in 20Hzup to 20kHz rangeGain (for 1V FSD Output):From –30 to +100dB selectable in 10 ±0.05dBsteps, plus extra 0 to 10dB of continuous gainadjustment between steps. LED indication ofparticular gain setting selected

DIRECT INPUT:Via standard Brüel&Kjær coaxial socketImpedance: 1MΩ || 70pF (2610) or 1MΩ ||90pF (2636)Max. Input Voltage: 42V RMS in accordancewith IEC 348, but can withstand up to 220V RMS(50 to 60Hz). 400V peak including DC compo-nent

PREAMP. INPUT:Via standard Brüel&Kjær 7-pin microphonepreamplifier socket. Supplies followingMicrophone Polarization: 0; +28 and +200Vfrom 20MΩ sourcePreamplifier Voltage: +150V (2mA max.) 12kΩsourceHeater Voltage: +6V (at 200mA) from 30Ωsource or +12V (200mA max.) from 100mΩsource

INTERNAL REFERENCE:Facilities calibration of 2610 and 2636 for sound,vibration and voltage measurementsReference Signal: 50mV RMS (~94dB re 1µV),1kHz sine waveAmplitude Stability: Better than 2% between+5 and 40°C (+41 and +104°F)

EXTERNAL FILTERS:Provision for connecting external filters in serieswith internal filters and weighting networks viatwo BNC sockets on rear panelTo (Ext. Filter) Input: 1V RMS nominal, 10Vpeak max. output. Max. load 5kΩ || 200pFFrom (Ext. Filter) Output: 1V RMS nominal,10V peak max. input. Input impedance 1MΩ ||50pF

AC OUTPUTS:From Output Section Amplifier via standardBrüel&Kjær coaxial socket on front panel1V FSD Output: 10V peak max. with max. loadof 10kΩ || 200pFOutput Impedance: ~100ΩFrom Recorder Amplifier via BNC socket on rearpanel1.6V FSD Output (2610 only): 16V peak max.with max. load of 10kΩ || 200pF5V FSD Output (2636 only): 50V peak max.

Common Specification

load of 10kΩ || 200pFOutput Impedance: ~50Ω

OVERLOAD WARNING:Gain indicators flash when Input and (or) OutputSection is overloaded by positive or negativesignal peaks of too high levelInput Overload L evel: Equivalent to 5 or 10times FSD on meter. Level selectable usingswitch on rear panelOutput Overload Level: Equivalent to 10 timesFSD on meterMin. Overload Duration: 200µsDuration of Warning: 0.5s or longer

HARMONIC DISTORTION:Input Section: <0.01% at 1kHz, <0.1% at50kHz. Max. load 5kΩ || 200pFOutput Section: <0.1% at 1 kHz. <0.3% at50kHz. Max. load 10kΩ || 200pF

NOISE REFERRED TO INPUT:Max. amplification with input shortedInput Section Noise:Lin 2 (or 22.4)Hz to 200kHz ≤5µVLin 2 (or 22.4)Hz to 22.4kHz ≤1.5µVA-, B- and C-Weighting ≤1.5µVD-Weighting ≤2.5µVSee EMC Immunity, Note 2Output Section Noise:Lin 2Hz to 200kHz typ. 50µV

SIGNAL-TO-NOISE RATIO:

INFLUENCE OF MAGNETIC FIELDS:Input section with maximum gain and input shortcircuited typ.10µV at 80A/m 50Hz

DETECTOR TEMP. STABILITY:±0.5dB from +5 to +40°C

POWER REQUIREMENTS:Supply Voltage: 100; 115; 127; 200; 220; 240V(50–60Hz) ±10% ACPower Consumption:~25VA nominal (2610 only)~35VA nominal (2636 only)

CABINET:Supplied as model A (light-weight metal cabinet)or model C (as A but with flanges for standard19-inch rack)

DIMENSIONS:Metal cabinet excluding knobs and feetHeight: 133mm (5.2in)Width: 430mm (16.9in)Depth: 200mm (7.9in)

WEIGHT:2610: 5.2kg (11.5lb.)2636: 6.5kg (14.3lb.)

s 2610 and 2636

7

Enclosure IEC 529 (1989): Protection provided by enclosures: IP 20

FILTER MODES:22.4Hz: High-pass filter with low frequency at-tenuation slope of 18dB/octave (60dB/decade)A-Weighting: In accordance with IEC 651 (Type0) for precision sound level metersExt.: See Common Specifications

METER INDICATION:Moving coil meter with interchangeable meterscales and LED indication of particular meas-urement range selectedMeasurement Range: 10µV to 30V FSD se-lectable in accurate 10 ±0.05dB stepsIndication Ranges: 0 to 10 and 1 to 30 loga-

Additional Specificatio

8

rithmically graduated amplitude ranges, plus 0to 30dB linearly graduated range

For Meter and DC output

DETECTOR CHARACTERISTICS:For Meter and DC OutputRMS Mode:Crest Factor Capability: 10 at full scale. 20 forlesser deflectionsDynamic Range: +20 to –50dB re FSDAccuracy: ±0.2dB typ. ±>0.5dB overallAveraging: “Fast” and “Slow” in accordance withIEC 651 (Type 0), plus 20s effective averagingtimeMax. (Positive or Negative) Peak Mode:Dynamic Range: +20 to –40dB re FSDAccuracy: ±0.2dB typ. See Fig.6Rise Rate: 1.7dB/µs corresponding to rise time

Max. Hold Mode: Meter and DC Output holdmax. RMS or max. Peak level of signal. Holddecay <0.2dB/minute at 25°CReset Mode: Meter and DC Output reset to zerowith 0.3s delay before meter indication and DCoutput voltage restored

DC OUTPUT:From Detector Amplifier via BNC socket on rearpanelOutput Voltage: 100mV/dB; 5V DC re FSD; 7V(10mA) max.Output Impedance: ~50ΩDynamic Range: See Detector Characteristics

ns 2610

of ~25 µs for 40 dB change in signal levelDecay Rate: 40dB/s

FILTER MODES:22.4Hz: High-pass filter with low frequency at-tenuation slope of more than 30dB/octave(100dB/decade)22.4kHz: Low-pass filter with high frequency at-tenuation slope more than 30dB/octave (100dB/decade)A-, B-, C- and D-Weighting: In accordance withIEC 651 (Type 0) for precision sound level me-tersExt.: See Common Specifications

METER INDICATION:Moving coil meter with interchangeable scalesand LED indication of measurement and scalerange selectedMeasurement Ranges: 10µV to 30V FSD se-lectable in accurate 10 ±0.05dB steps. 100µVto 300V FSD with 10:1 Attenuation ProbeZC0016 suppliedLin. Mode Indicating Ranges: 0 to 10 and 0to 31.6 Linearly graduated amplitude ranges,plus –∞ to +20dB range30dB Log. Mode Indicating Ranges: 0 to 10and 1 to 30 Logarithmically graduated amplituderanges, plus 0 to 30dB Linearly graduated range60dB Log. Mode Indicating Ranges: 0.3 to300 and 1 to 1000 Logarithmically graduatedamplitude range, plus 0 to 60dB Linearly grad-uated range

DETECTOR CHARACTERISTICS:

Additional Specificatio

RMS Mode:In accordance with IEC 651 Type 0 except formeter overswing with the Log-60dB indicatingmodeCrest Factor Capability: 10 at full scale;Up to 50 for lesser deflectionsDynamic Range: +20 to –50dB re FSDAccuracy: ±0.2dB typ. ±0.5dB overallAveraging: “Fast” and “Slow” to IEC 651 (Type0), plus 0.1; 0.3; 1; 3; 10 and 30s averagingtimesPositive, Negative and Max. Peak Modes:Dynamic Range: +20 to –40dB re FSDAccuracy: ±0.2dB typ. See Fig.6Rise Rate: 5; 0.5 and 0.05dB/µs correspondingto rise time of 8, 80 and 800µs for 40dB changein signal levelDecay Rate: “Fast” (43.4dB/s); “Slow” (4.34dB/s) and 0.5s Max. HoldImpulse Mode: In accordance with IEC 651(Type 0 impulse) for precision sound level metersMax. Hold Mode: Meter and DC Output holdMax. RMS, Impulse and Peak Level of signal.Hold decay <0.2dB/minute at 25°CReset Mode: Meter and DC Output reset to zerowith ~0.3s delay before meter indication and DCoutput voltage restored

DC OUTPUT:From Detector Amplifier via BNC socket on rearpanelLog. Mode Output: 100mV/dB; 5V DC re FSD;

Lin. Mode Output: 5V DC re FSD; 12V (10mA)max.

DIGITAL SECTION:Accuracy: ±0.1dB (Log) at 25°C±0.3% (Lin) of FSDGain Error: ±0.2dB at FSD at 5 to 40°CConversion Time: 10ms ±0.1%

IEC DIGITAL INTERFACE:Conforms to IEC 625-1, compatible with IEEEStd. 488 interfaceIEC Functions Implemented: Source Hand-shake (SH1), Acceptor Handshake (AH1), Talker(T5), Talk Only, Listener (L4), Remote Local(RL1), Service Request (SR1)Data: Format for calculator or printer may beselected. Data transmitted via A/D converterevery 10msCode: ISO 7-bit code (i.e. ASCII, but withoutparity bit)Remote Control: Front panel settings selectablevia standard interfaceSpecial functions included:1617–2636 Control: Program for automatic op-eration with 1617 Band Pass Filter and averag-ing time selection with 2636, plus read-out offrequency and measurement results to printerSelf Test: Program for automatic self-test andbasic check out of 2636. Checks front panelswitch functions, attenuator and detector linear-ity, detector time constants, filter attenuation and

ns 2636

7V (10mA) max. noise. Check out time approximately 3 minutes

Type 2610 : Measuring AmplifierIncludes the following Accessories:JP 0144: B&K to BNC coaxial adaptorSA 0250: ms–2 Scale (30 dB Log)SA 0252: dB SPL Scale (28 – 89 mV/Pa.

30 dB Log)

Ordering Information 2

SA 0253: dB SPL Scale (5 – 16 mV/Pa. 30 dB Log)

Ordering Information Type 2636 : Measuring AmplifierIncludes the following Accessories:JP 0144: B&K to BNC coaxial adaptorJP 0802: 8-pin DIN plugSA 0259: Volts, dB Scale (Lin)SA 0261: Volts, dB Scale (60 dB Log)SA 0262 dB SPL Scale (28 – 89 mV/Pa.

30 dB Log)SA 0263: dB SPL Scale (5 – 16 mV/Pa.

30 dB Log)SA 0267: dB re 1µV Universal Scale (Lin;

30 and 60 dB Log)SA 0270: ms–2 Universal Scale (30 dB Log)See General Accessories Product Data for otherscales availableUA 0793: IEC 625-1 25-way Bus3 × VF 0042: 315 mA slow blow fuse2 × VF 0051: 160 mA slow blow fuse2 × VS 1273: Scale lamps, 7 V/250 mAZC 0016: 10:1 Attenuator Probe

Power Cable

Brüel&Kjær rese

See General Accessories Product Data for other scales available2 × VF 0030: 125 mA slow blow fuse3 × VF 0031: 250 mA slow blow fuse2 × VS 1273: Scale lamps, 7 V/250 mA

Power cable

Accessories Available:DB 2609: Preamp. Input Adaptor for old

Brüel & Kjær 7-pin plugsZG 0350: 7-pin LEMO to B & K Adaptor

610

9

2636

Accessories Available:DB 2609: Preamp. Input Adaptor for old

Brüel & Kjær 7-pin plugsZG 0350: 7-pin LEMO to B & K AdaptorAQ 0034: 1617 Filter Control CableAO 0145: Averaging Time Control CableAO 0194: Interface Cable (2 m), IEC 625-1

(25-way)AO 0184: Interface Cable (2 m), IEC (25-

way male, slide lock) to IEC 625-1AO 0264: Interface Cable (2 m), IEC 625-1

(25-way) to IEEE-488AO 0195: Adaptor to convert IEEE-488

connector to IEC 625-1 (25-way)

Modifications AvailableWH 1769: 10 s and 30 s RMS averaging

changed to 10 ms and 30 ms, respectively. This modification is used in Basic Telephone Test Bench Type 6702

WH 1698: “D” weighting network replaced by a standardised Psophometric filter (CCITT Rec.P.53)

WH 2632: “D” weighting network replaced by a standardised C-Message filter (IEEE 743)

These modifications are not standard productioninstruments. Specifications can be modified, ona contract basis, to meet individual require-ments. For prices and delivery time, please con-tact your local Brüel&Kjær representative

rves the right to change specifications and accessories without notice

Brüel & Kjær B K

BP 0205 – 16 96/09

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