Keysight Technologies N5244/5B Service Manual page 132

Troubleshooting
Measurement System Troubleshooting
Equipment Used for This Check
Equipment Type
Power meter
Power sensor, 2.4 mm
Adapter, 2.4 mm (f) to 2.4 mm (f)
Equipment Setup
1. Before starting these checks, zero and calibrate the power meter. (See the
power meter user's guide for instructions on setting the calibration factor.)
2. If the Receiver Display
screen, perform the following: Press UTILITY
Utilities
3. Set the sweep speed for a 10 second sweep: Press STIMULUS
then
box.
To isolate a broadband RF signal generation failure, check the test port
output power:
1. Note the power reading displayed on the power meter; it should be the
preset power level +/- 1 dB.
2. Connect the power sensor, in turn, to Ports 2, 3, and 4 and set trace to
measure S22, S33, and S44 respectively. Note the power reading
displayed on the power meter.
— If the power level is low or high on all test ports, the problem is LO signal
related. Continue with
— If the power level is low or high on only one of the test ports, the problem is
either source group or in the signal separation group. Continue with
"Checking the A14 50 MHz Reference Outputs"
Checking the A14 50 MHz Reference Outputs
1. Refer to the block diagram at the end of this chapter and to
All Cables—All Options, S/N Prefixes <6021" on page
cables W75, W76, and W77, at the A14 frequency reference board.
4-38
(Figure 4-8
Receiver Display
, then
Sweep Time
. Set the time to 10.000 seconds in the Sweep Time
"Checking the A14 50 MHz Reference
Model or Alternate Model or
Part Number Part Number
E4418B/E4419B E4418A/E4419A
E8487A None
11900B 85056-60007
or Figure 4-9) is not on the analyzer
System , then
.
to check the source group.
6-24. Locate flexible
Keysight N5244B/45B Service Guide
Service
, then
,
Sweep
Outputs".
"Top Cables,