BRUEL & KJAER 2607 User guide

Measuring Amplifier

Type 2607

portable

instrument measuring

true

RMS signal levels with

averaging times from

0.1

to 300 sec,

and positive peak, negative peak,

maximum

peak

levels with a

rise time

sec. With a B &K

microphone

and

preamplifier

conforms

precision

sound level

meter recommendations and the

DIN standard

for

impulse sound

level meters.

MEASURING

AMPLIFIER

TYPE 2607

November 1970

CONTENTS

1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2. CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1.

Front

Panel

2.2. Rear

Panel

.................................

3. OPERATION

........................................

3.1. Adjustments

................................

Preliminary Adjustments

......................

Polarization Voltage

..........................

Signal

Chassis

Ground

.......

..............

3.2. Calibration

for

Sound Measurements

.............

Using Pistonphone

Sound Level Calibrator

.......

Using Internal Reference Voltage

................

3.3. Measurement

Sound . . . . . . . . . . . . . . . . . . . . . . . . 16

3.4. Calibration

for

Vibration

Measurements

...........

Using Accelerometer Calibrator 4291

.............

Using Internal Reference Voltage . . . . . . . . . . . . . . . . 18

3.5. Measurement

Vibration

.....................

3.6. Calibration

for

Voltage Measurements

............

3.7. Voltage Measurements

.....

..................

Input

Voltages up

300

Volts

RMS

.............

Input

Voltages up

700

Volts

Peak

.............

3.8. Insert Voltage Calibration

......................

Using Internal Reference Voltage

................

Using

External Generator . . . . . . . . . . . . . . . . . . . . 22

3.9.

Use

the Averaging Time Socket

...............

Remote Selection

Averaging Time

Decay Time Constant

.......................

Remote Meter Reset . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Remote Indication

Overload . . . . . . . . . . . . . . . . . 25

Operation

2607

with

Filter Set 1612

...........

4. DESCRIPTION

.........................•.•...........

4.1.

Input

Circuit and

Input

Amplifier

...............

4.2. Reference Oscillator

..........................

4.3.

Input

Overload Indicator . . . . . . . . . . . . . . . . . . . . . . 28

4.4. Filter Section

...............................

4.5.

Output

Section

Amplifier

......................

4.6.

Output

Overload Indicator . . . . . . . . . . . . . . . . . . . . .

4.7.

RMS

Detection and Averaging

..................

4.8.

Peak

Rectifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.9.

Lin/Log

Converter

...........................

4.1

0. Power Supply

...............................

4.11. Overall Characteristics

........................

Dynamic

Range

.............................

Frequency

and

Phase

Characteristics

.............

5. FREQUENCY

ANALYSIS

AND

RECORDING

..............

5.1. General

....................................

5.2.

RMS

Measurements and Statistical Accuracy

.......

5.3. Practical Notes

Recording Analyses

............

Averaging Time

with

AC Recording

..............

Level Recorder Setting

for

output

2607

......

Filter Scanning

Speed

.........................

5.4. Analysis Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . .

Recording

...............................

AC Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

5.5. Power Spectral Density . . . . . . . . . . . . . . . . . . . . . . . . 57

5.6. Tape Recording

.............................

6. ACCESSORIES

.......•.....•.•........••.......•.....

6.1. General

....................................

6.2. Rack Mountings

.............................

SPECIFICATIONS

......•...........•...............•.

INTRODUCTION

The

2607

Measuring Amplifier

capable

an extensive range

sound,

vibration and voltage

measuremen~s.

combines

extreme

versatility with a

wide

measurement

range and

laboratory

precision. Used

with

one

the

8 & K

condenser

microphones

and

a suitable preamplifier,

the

2607

becomes a precision

sound

level

meter

the

Recommendation

179

and

an impulse

sound

level

meter

the

German DIN

Standard

45633

parts 1

and 2 (March

1967).

basically a wide range measuring amplifier

for

linear as well as

logarithmic

operation

and

includes

true

RMS

and

Peak rectifier circuits.

The

rectifier circuits

contain

time

constants

ranging

from

0.1

300

sec which

can be directly

remotely

selected

give averaging times

for

RMS

measurements

and decay times for Peak measurements. A display

meter

with interchangeable

meter

scales

which

the

range setting

automatic-

ally indicated facilitates

the

direct

calibration

the

2607

for

sound

pressure level, acceleration and voltage measurements.

Amongst

other

features are mains

battery

operation,

overload indicat-

ors

input

and

output

sections, an internal calibration source and facilities

for

the

insert voltage calibration

microphones.

The

2607

also

contains

the

internationally

standardized

sound

level

meter

frequency

weighting

networks

A, 8

and

C as well as

the

network

for

jet

engine noise measurement.

For

frequency

analysis

the

2607

may be

used

with

the

1614/15

Filter Sets

the

2020

Heterodyne

Slave Filter.

The

analysis may be recorded using

the

2305

Level Recorder for which

both

and

outputs

are available

the

2607.

Normally, however,

the

output

will be preferred

for

recording since a fully averaged

RMS

signal level

provided,

the

accuracy

which

controlled

the

time

constants

the

2607.

This

also an

extremely

important

feature

when

digital processing

signal levels

performed.

2.1. FRONT PANEL

Gain Control

Uncal.

CONTROLS

r---Overload

Indicators----,

Range Setting Indicator

Meter

Function

Averaging

Time

Input Section

Attenuator

Outpu Section

Attenuator

METER SCALE:

Fig.2.1.

Front

Panel

2607

Tilt

the

glass

panel forward

slide the

scale

out.

Immediately below the meter

are

two

rows

push-buttons. Their

funct-

ions

are

follows:

POWER:

INPUT:

REF.:

On/Off

push-button

for

power.

"Direct"

input

via

"Preamplifier"

may

chosen.

Supplies

mV,

kHz

sine

wave

signal

for

internal calibration.

INSERT

VOLT.

CAL.:

EXT.:

22.4 Hz:

22.4

kHz:

WEIGHTING:

Choice

"Internal"

"External"

signal.

"Internal"

from

the 1 kHz sine wave

generator.

"External"

for

connection

frequency generator

via

rear panel input. The

load impedance

1 k!1. For

use

in connect-

ion

with

microphone

input

from

the Insert

Voltage Cathode Follower 2617.

Choice

external

internal

filter

selection.

High

pass

filter

with

cut-off

frequency at

22.4 Hz.

Sets

lower

limit

audio frequency

range.

Low

pass

filter

with

cut-off

frequency at

22.4 kHz.

Sets

upper

limit

audio frequency

range.

For selection

one

the weighting net-

works D,

When

none

are

selected

the amplifier

has

a linear frequency

response

from

2 Hz

200 kHz.

The remaining controls and sockets on the

front

panel are:

GAIN

CONTROL:

UNCAL.:

INPUT SECTI

ATTENUATOR:

For continuous control

gain

the

input

amplifier.

When

in position

"Cal."

the gain

fixed. Maximum attenuation

from

"Cal."

position

10-11

dB. The control operates

with

either

DIRECT

PREAMP.

input

selected.

This

light

operates when the

GAl

CONTROL

knob

uncalibrated posit-

ion.

For attenuation

input

signal by 10 dB

steps.

Voltages marked around the knob show

the maximum

input

voltage (for

full

scale

deflection)

for

each

knob setting. By using the

Gain Control

input

voltages

700 V peak

can

measured.

See

section 3.7.2.

OVERLOAD

INDICATORS:

These indicate overload in

input

output

amplifiers. While the lights flash the meter

reading

inaccurate

and

less

than the correct

value.

DIRECT

INPUT:

PREAMP. INPUT:

SENS.:

OUTPUT;SECTION

ATTEI"fUATOR:

METER

FUNCTION:

LOG/LIN:

Coaxial socket

input

the

input

amplifier.

Input

impedance 1

MQ//50

pF. Takes B & K

plugs

0101.

7 pin socket

for

connection

B & K micro-

phones

via

their

preamplifiers.

Input

imped-

ance

900

kQ//50

pF.

Two

screwdriver operated potentiometers

situated

their

respective inputs. They

adjust the gain

the

input

amplifier

com-

pensate

for

different

transducer sensitivities.

They

work

independently

each

other and

each

has

a range

approx. 14 dB.

Stepped attenuator (10 dB steps)

for

attenuat-

ion

the signal level between

filter

outputs

and the

output

amplifier.

ensure the best

possible signal/noise ratio the knob should

kept

far

clockwise

possible.

This selects the appropriate meter character-

istics

for

RMS, Impulse

and

Peak

measure-

ments. In the

"Impulse

Hold"

position the

meter

will

hold the maximum impulse sound

level value

the applied signal. In the

"Peak"

positions, the decay characteristic

the

meter

selected on the

AVERAGING

TIME

control.

Two

position switch

with

the

following

funct-

ions:

"Log".

Meter display and

output

pro-

portional

the measured dB value.

Range

dB.

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