BRUEL & KJAER 1024 User Manual

BROEL & KJ.ER
NC2rum - Denmark
Service Instructions
Sine - Random Generator
Consisting of:
tv'.eter Circuit
Output Amplifier
Oscillator
Compressor
Position of Components
Parts
Li st
Circuit Diagram
Removal of the !Vetal Case
1024.1
1024.2
1024.3
1024.4
1024.5
1024.6
1024.7
1024
After removing the four threaded re tainers at the back of the instrument, it is possible to slide the chassis and the front ponel out
of the case.
Troub le Shooting
If the reason for a fault is not an obvious one such as a de ad tv be, broken down resistor, blown or disconnected fuse etc., then
first test the voltages of all the tubes and compare them with the voltages shown in the circuit diagram in order to localize the
defect. Should this method of finding the fault prove unsuccessful, then check the instrument by adopting the method described in
the adjustment procedure . When the trouble has be en found and remedied, the vo ltages and adjustments which ar e i nfluenced by
the remedy must
be rechecked.
The tolerances stated in the instructions can anly be used as a guide for adjustment and control, but any deviations must not be
corrected without being sure that the tolerances of the instruments used for making the ad justme nt are so small as to have no i n-
fluence on the mea$urements .
The instructions in this
tv\anual are given purely as a guide to the service of equipment with minor faults . Some faults, as f .inst.
small deviations in tolerances require for their correctio n special control equipment and extensive experience, and in these cases
it is necessary to ~nd the instrument to the factory .
~
Please state type and serial numb er of apparatus when spare parts are ordered.
Instruments necessary for
service and repair
Multimeter (SO ~)
Frequency Analyzer Type 2107
(Frequency counter or a frequency standard and a service oscilloscope)
(Vacuum Tube Voltmeter Type 2409)
(Frequency and Distortion .v.easuring Br Jdge Type 1607)
1024-16 5

BRUEL & KJAER 1024 Specifications

General

Brand	BRUEL & KJAER
Model	1024
Category	Inverter
Language	English

Summary

Meter Circuit Adjustments

Mechanical Zero-point Calibration

Adjust for zero output with no power applied.

Meter Circuit Balance Adjustment

Adjust output level for specific deflection and check voltages.

Sensitivity Verification

Adjust output level for precise deflection and check sensitivity.

Meter Time Constant Check

Adjust output level for deflection and check meter response time.

Voltage Divider Calibration

Adjust output level for deflection and check voltage divider accuracy.

Output Amplifier Performance Checks

Frequency Response Verification

Adjust output level and vary frequency to check response.

Power Output Testing

Check power output capability and voltage with specified load.

Instability Check

Check amplifier stability by applying a condenser and observing oscillation.

Attenuator Performance

Adjust output level and check attenuator positions against a reference.

Distortion Measurement

Adjust output level and check distortion at various frequencies.

Noise and Hum Measurement

Measure noise and hum levels under specified conditions.

Output Transformer Check

Adjust output level and check output transformer performance.

Oscillator Calibration Procedures

Fixed Oscillator Adjustment

Adjust air trimmer for target frequency on the 123 kHz socket.

Variable Oscillator Calibration

Adjust air trimmer and iron core for specific frequencies.

3 kHz Filter Verification

Adjust filter components and check frequency response curve.

3 kHz Oscillator Frequency

Short-circuit and connect frequency counter to verify oscillator frequency.

Noise Generator Calibration

Connect oscilloscope and adjust output level for noise distribution check.

1000 Hz Reference Signal

Adjust oscillator at line frequency and set reference signal.

120 kHz Selective Amplifier

Adjust output level and filter iron cores for maximum deflection.

Balanced Modulator Check

Measure signal level after short-circuiting to ground.

Frequency Drift Monitoring

Adjust oscillator after warm-up and monitor drift over time.

Magnet Clutch Lubrication

Lubricate magnet slip-ring and capacitor-slipper with petroleum jelly.

Compressor Functionality Tests

Compressor Balance Adjustment

Adjust output level and check signal on anodes of V 14.

Frequency Response of Compressor

Adjust compressor voltage and vary frequency to check response.

Gain Reserve Measurement

Adjust output level with compressor input disconnected.

Compression Ratio Test

Adjust compressor voltage and check deflection change.

Component Layout Diagrams

Main Board Component Layout

Diagram showing component placement on the main printed circuit board.

Sub-board Component Layout

Diagram showing component placement on secondary printed circuit boards.

Attenuator Component Layout

Diagram showing component placement for the attenuator section.

Bandwidth Selector Layout

Diagram showing component placement for the bandwidth selector.

Meter Switch Component Layout

Diagram showing component placement for the meter switch.

Parts List

Capacitors and Resistors

List of capacitors and resistors with stock reference and circuit diagram reference.

Switches and Potentiometers

List of switches and potentiometers with stock reference and circuit diagram reference.

Rectifiers and Tubes

List of rectifiers and vacuum tubes with stock reference and circuit diagram reference.

Miscellaneous Components

List of miscellaneous parts including connectors, knobs, and transformers.

Circuit Diagram

Overall Circuit Schematic

Comprehensive circuit diagram showing all functional blocks and components.