When Using An Hp 8350 Lo Source - HP 85325A Operating And Service Manual

When Using an
HP 8350 LO Source
Installation
Mixer Operational Check
13. Determine which receiver input has the test signal connected to it (b1,
b2, or a2).
14. Measure that input using the USER softkeys (on HP 8510) or SERVICE
PARAMETER softkeys (on HP 8530).
15. Press:
[DISPLAY]
{SELECT DEFAULTS}
{DEFAULT to MEMORY: 1}
{DATA and MEMORY}
Adjust the display reference so the two traces are centered vertically.
Refer to the value you wrote down in Step 7.
16. Set display scale to 1 dB/division.
17. Make sure the two signals are within 3 dB of each other.
18. If your system has more than one test channel, check each one in the
same way.
Perform the following steps ONLY if using an HP 8350 LO source:
1. Press
{DATA and MEMORY}
2. On the rear panel of the HP 85309A:
a. Disconnect the green (b2) wire from the TEST IF OUT connector.
b. Move the brown (a1) cable from the REFERENCE IF OUT
connector to the TEST IF OUT connector.
3. Make sure the two displayed traces are within 3 dB of each other. (This
step is required so the receiver can phase lock.)
4. If your system has a second test channel:
a. Move the red (b1) wire to the TEST IF OUT connector.
b. Make sure the two displayed traces are within 3 dB of each other.
5. If your system has a third test channel:
a. Move the yellow (a2) wire to the TEST IF OUT connector.
b. Make sure the two displayed traces are within 3 dB of each other.
6. Move the a1 and b2 (and possibly b1 and a2) input lines back to their
original configuration.
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