Chapter 8 427
IF Section
Log Amplifier Assembly (P/O A4)
4. On the HP 8560E/EC, press SGL SWP.
5. Disconnect W27 (coax 3) from A5J5. Connect a test cable from A5J5
to the input of an HP 8566A/B.
6. Set the HP 8566A/B as follows:
Center frequency ................................................. 10.7MHz
Span ........................................................................... 2kHz
Reference level ..................................................... +10dBm
Sweep ......................................................................... Single
7. Press TRACE A
CLEAR-WRITE on the HP 8566A/B.
8. Trigger a sweep on the signal generator and on the HP 8566A/B
simultaneously. The HP 8566A/B should display a 3 dB bandwidth of
approximately 500 Hz.
9. Reconnect W27 (coax 3) to A5J5 and W29 (coax 7) to A5J3.
4.8 kHz and 10.7 MHz IF Filters
1. On the HP 8560E/EC, press PRESET, FREQUENCY, 300 MHz, SPAN,
600
Hz, CAL, and IF ADJ OFF.
2. Disconnect W29 (coax 7) from A5J3. Set the signal generator for a
10.7 MHz signal at −60 dBm and connect it to A5J3.
3. Fine tune the frequency of the signal generator to center the signal
on the HP 8560E/EC display. Set the signal generator to sweep one 2
kHz span about this center frequency.
4. On the HP 8560E/EC, press SGL SWP.
5. Set the HP 8566A/B to 4.8 kHz center frequency and 2 kHz span.
CAUTION Damage to the HP 8566A/B results if a dc block is not used. The HP
8566A/B and many other spectrum analyzers have dc-coupled inputs
and cannot tolerate dc voltages on their inputs.
6. Connect the VIDEO OUTPUT (rear panel) of the spectrum analyzer
through a 20 dB attenuator and dc block to the input of the HP
8566A/B. Set the sweep time of the HP 8566A/B to 10 seconds.
7. Set the HP 8566A/B to single trigger and press TRACE A
CLEAR-WRITE. Trigger a sweep on the HP 8566A/B and on the signal
generator simultaneously. The HP 8566A/B should show a 3 dB
bandwidth of 600 Hz ±100 Hz.
8. Reconnect W29 (coax 7) to A5J3.
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