Checking The Signal Separation Group - Agilent Technologies PNA Series Service Manual

PNA Series Microwave Network Analyzers
E8361A

Checking the Signal Separation Group

Before checking the signal separation group, perform the following procedures:
• "Getting Ready to Test" on page 4-41
Checking the Output Power of the A and B Signals
Using a power meter, you can measure the outputs of the A and B signals from the front
panel. The measurement results will help you isolate a faulty assembly. The outputs of the
R1 and R2 channels cannot be measured because it would necessitate breaking the phase
lock loop, causing all of the signals to be lost.
Equipment Used for These Tests
Equipment Type
Power meter
Power sensor, 1.85 mm
Adapter, 3.5 mm (f) to 3.5 mm (f)
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
On the menu, point to
System
3. Set the sweep speed for a 10 second sweep: On the
set the time to 10.000 seconds in the
Checking Port 1 Power (A Signal)
The object of this check is to verify the power of the A signal across the entire frequency
range. Perform this test if there is an observed problem only with the channel A trace. The
ten second sweep is slow enough to allow you to observe the output power on the power
meter as the sweep occurs.
1. Connect the power sensor to Port 1.
2. Observe the power reading on the power meter as the sweep occurs on the analyzer.
3. The measured output power on the power meter should be within −15 dBm ±4 dB for all
E8361A PNAs, over the entire frequency range.
• If the measured power is correct, go to
• If the measured power is not correct, go to
Separation Path" on page
Service Guide E8361-90001
Model or
Part Number
E4418B/E441B
V8486A
83059B
8487A
11900B
(Figure 4-9) is not on the analyzer screen, perform the following:
Service, Utilities,
Sweep Time
"Checking the Receiver Group" on page
4-50.
Measurement System Troubleshooting
Alternate Model
or Part Number
E4418A/E4419A
None
85052-60012
None
85056-60007
and then click
Receiver Display.
menu, click
Sweep
box.
"Checking the Signal through the Signal
Troubleshooting
and
Sweep Time
4-52.
4- 49