Anritsu 682XXB - Manual (Page 182)

5-16 682XXB/683XXB MM
Output Power Related Problems
(>40 GHz)
682XXB/683XXB Models with SQM
Description: The signal generator does not display any error message
during self-test; however, there is no or low RF output above 40 GHz.
Step 1. Set up the 682XXB/683XXB as follows:
a. 682XXB Setup:
CW/SWEEP SELECT: Step
F1: 40.0 GHz
F2: 50.0, 60.0, or 65.0 GHz (Model dependent)
Number of Steps: 400
L1: –2.0 dBm
683XXB Setup:
CW/SWEEP SELECT: Analog
F1: 40.0 GHz
F2: 50.0, 60.0, or 65.0 GHz (Model dependent)
Sweep Time: 0.100 Sec
L1: –2.0 dBm
Step 2. Connect the X input of an oscilloscope to the 682XXB/
683XXB rear pane
HORIZ OUT connector.
Step 3. Using the oscilloscope, check the following voltages:
a. For models having a high end frequency of 50 GHz, check
the SQM bias voltages at A14TP5 and A14TP7. The bias
voltage at A14TP5 should be +10 volts; the bias voltage
at A14TP7 should be –5 volts.
For models having a high end frequency of 60 or 65 GHz,
check for a +12 volts SQM bias voltage at A14TP6.
b. For all models, check for a –2 volt PIN switch drive volt-
age at A9TP22.
G If the SQM bias and PIN switch drive voltages are
correct, go to step 4.
G If the SQM bias voltage(s) is not correct, replace the
A14 PCB.
G If the PIN switch drive voltage is not correct, replace
the A9 PCB.
Table 5-4. Malfunctions Not Displaying an Error Message (5 of 6)
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