3.3.12 Transmitter Unit Ze 0796 - BRUEL & KJAER 5998 Service Manual

3.3.12 Transmitter Unit ZE 0796

1. Set the front panel controls on Type 5998 as follows:
2. Connect Transmitter Unit ZE 0796 to the Channel B Transmitter socket.
3. Screw a JJ 2617 onto the Transmitter Unit and short-circuit this with JP 0169.
4. Apply 1 V at 1 kHz to the Genarator Input BNC socket using cable AO 0479.
5. Use the Measuring Amplifier to check there is about –34 dB re.1 V on the Out-
6. Change the frequency to 25 kHz. The output should still be about –34 dB re.1 V.
7. Reduce the frequency towards 1 Hz and check that the frequency response is flat
8. Set Ref. to On and the Gain to 40.
9. Use the Measuring Amplifier to check there is about 1 V on the Output BNC
10. Remove the JJ 2617 adaptor. Check there is still about 1 V on the Output BNC
BI 5044 –11
Control
Gain
Output
HP Filter
Ref.
Polarization Voltage
put BNC socket.
until 50 Hz. By 20 Hz the level should fall by –3 dB.
socket.
socket. (This checks the Transmitter unit as far as the microphone capsule on
both the T and T pathways (see
1 5
Reciprocity Calibration Apparatus Type 5998
Setting
0
B
20
Off
0
section
Service Manual
Chapter 3 — Checking Procedure
Checking Procedure
5.3).)
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