Anritsu 682XXB - Manual (Page 207)

682XXB/683XXB MM 5-41
Output Power Level Related Problems
(0.01 to 20 GHz)
Error 128 .01-2 GHz Unleveled
Description: Error 128 indicates a failure of of the down converter
leveling circuitry. The 682XXB/683XXB may or may not produce an RF
output in the 0.01 to 2 GHz frequency range. Thus, there are two trou-
bleshooting paths for this problem—unleveled with output power and
unleveled with no/low output power.
Unleveled with output power (The warning message UNLEVELED
appears on the front panel display):
Step 1. Set up the 682XXB/683XXB as follows:
a. 682XXB Setup:
CW/SWEEP SELECT: Step
F1: 0.010 GHz
F2: 2.000 GHz
Number of Steps: 400
L1: +1.00 dBm
683XXB Setup:
CW/SWEEP SELECT: Analog
F1: 0.010 GHz
F2: 2.000 GHz
Sweep Time: 0.100 Sec
L1: +1.00 dBm
b. LEVEL/ALC SELECT: ALC Mode
ALC Mode: Ext ALC Front
Leveling Menu: External Detector
Step 2. Connect a detector to the 682XXB/683XXB RF OUTPUT con-
nector and connect the detected DC output of the detector to
the front panel
EXTERNAL ALC IN connector.
G If the warning message UNLEVELED no longer appears
on the front panel display, replace the down converter.
G If the warning message UNLEVELED is still displayed,
replace the A10 PCB.
Table 5-20. Error Messages 128, 129, 130, 131, 132, 133, 134, and 135 (1 of 8)
TROUBLESHOOTING
TROUBLESHOOTING TABLES