Checking Procedure; Gain And Frequency Response, Channel A - BRUEL & KJAER 5998 Service Manual

3.3

Checking Procedure

3.3.1

Gain and Frequency Response, Channel A

1. Set the front panel controls on Type 5998 as follows:
2. Apply 1 V at 1 kHz to the Channel A Receiver input using cable AO 0479.
3. Use the Measuring Amplifier to check there is 1 V on the Output BNC socket.
4. Change the frequency to 200 kHz. The output should still be 1 V.
5. Reduce the frequency towards 1 Hz and check that the frequency response is flat
6. Reduce the generator signal by 10 dB and increase the front panel Gain by
7. Repeat the measurements from
BI 5044 –11
Control
Gain
Output
HP Filter
Ref.
Polarization Voltage
until 50 Hz. By 20 Hz the level should fall by –3 dB.
10 dB.
30 dB, 40 dB, 50 dB).
Reciprocity Calibration Apparatus Type 5998
Setting
0
A
20
Off
0
step 3.
Service Manual
Chapter 3 — Checking Procedure
Checking Procedure
for all gain settings (i.e. 10 dB, 20 dB,
3 − 3