Anritsu 682XXB - Manual (Page 211)

682XXB/683XXB MM 5-45
Unleveled with no/low output power:
Step 1. Set up the 682XXB/683XXB as follows:
a. 682XXB Setup:
CW/SWEEP SELECT: Step
F1: 0.010 GHz
F2: 20.000 GHz
Number of Steps: 400
L1: +1.00 dBm
683XXB Setup:
CW/SWEEP SELECT: Analog
F1: 0.010 GHz
F2: 20.000 GHz
Sweep Time: 0.100 Sec
L1: +1.00 dBm
b. LEVEL/ALC SELECT: ALC Mode
Leveling Menu: Internal
Step 2. Connect the X input of an oscilloscope to the 682XXB/
683XXB rear panel
HORIZ OUT connector.
Step 3. Using the oscilloscope, check the switched filter bias volt-
ages at A13TP4 and A13TP9. The bias voltage at A13TP4
should be +6 volts; the bias voltage at A13TP9 should be +8
volts. If the 682XXB/683XXB has a SDM installed, also
check for a +20 volt PIN switch drive voltage at A9TP9.
G If the bias and the PIN switch drive voltages are correct,
go to step 4.
G If the bias voltages are not correct, replace the A13 PCB.
G If the PIN switch drive voltage is not correct, replace the
A9 PCB.
Step 4. Connect a 562 Scalar Network Analyzer to the 682XXB/
683XXB as follows:
a. Connect the 682XXB/683XXB AUX I/O to the 562 AUX
I/O .
b. Connect the 562 DEDICATED GPIB to the 682XXB/
683XXB IEEE-488 GPIB .
c. Connect the RF Detector to the 562 Channel A Input.
Table 5-20. Error Messages 128, 129, 130, 131, 132, 133, 134, and 135 (5 of 8)
TROUBLESHOOTING
TROUBLESHOOTING TABLES