HP 85325A Operating and Service Manual 1-17
Installation
Mixer Operational Check
9. Make sure the signal is at anticipated levels. The coupled arm attenuates
the output of the HP 8355xA by 30 dB (this can vary depending on the
type of coupler used). Power flatness should be approxi/-3 dB
across the band.
10. Press:
[DISPLAY]
{DATA -> MEMORY}
11. Disconnect the reference mixer from the coupled arm of the directional
coupler. Put the test mixer in its place, as shown in Figure 1-7.
NOTE
If your system has more than one test channel, connect the coupled arm to
the first test channel (TEST 1).
12. Connect the Test LO and Test IF cables to the test module first, then to
the test mixer.
Figure 1-7
Test Mixer Connections
NOTE
Perform steps 13 through 18 ONLY if using a synthesized LO source.
Proceed to “When Using an HP 8350 LO Source” on page 1-18 if you have
an HP 8350 LO source.
