Noise, Channel A - BRUEL & KJAER 5998 Service Manual

3.3.5

Noise, Channel A

1. Set the front panel controls on Type 5998 as follows:
2. Terminate the Channel A Receiver input with a 50 Ω resistor between pins 2
3. Using the Measuring Amplifier, check that the noise in the band 22.4 Hz to
BI 5044 –11
Control
Gain
Output
HP Filter
Ref.
Polarization Voltage
and 4 of the Lemo connector.
22.4 kHz does not exceed the values given below at the indicated gain settings:
Gain 0 dB
Maximum Noise 100µV
Reciprocity Calibration Apparatus Type 5998
Setting
0
A
20
Off
0
10 dB 20 dB
300 µV
140µV
Service Manual
Chapter 3 — Checking Procedure
Checking Procedure
30 dB 40 dB 50 dB
425µV 1mV 3mV
3 − 7