Agilent Technologies 8719ET Service Manual page 59

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
4. On the analyzer, press the following:
PRESET: FACTORY
Preset
POWER
Sweep Setup
5. Enter the power value listed in
Table 2-8 Power Values for Flatness Test
Analyzer Model Type
8719ES and 8720ES
8719ET and 8720ET
8719ES Option 007
8720ES Option 007
8722ES
8722ET
8722ES Option 007
6. To set a 300 second sweep, press
7. To initiate a single sweep, press
8. During the sweep, notice the minimum and maximum power level readings, and record
these in the "Min." and "Max." columns on the "Level Accuracy" performance test
record.
The analyzer remains at each frequency point for 1.5 seconds to allow the power meter
sufficient time to settle.
If the Analyzer Fails This Test
1. Ensure that the power meter and power sensor are operating to specification.
2. Inspect the connectors for damage. Poor match at these connections can generate power
reflections and cause the analyzer to appear to be out of limits.
3. Marginal failures (especially at the high or low end) may be due to the power sensor
calibration factor approximation method. A calibration factor approximation of ±4%, as
in the above example, induces an error of about 0.15 dB. To eliminate the calibration
factor approximation as the cause of failure, do the following:
a. Press
Sweep Setup
b. Set the calibration factor on the power meter to the value indicated by the power
sensor.
c. The corrected power level reading should be between the limits shown in the "Level
Accuracy" performance test record.
4. The source relies on the power adjustments for proper performance, refer to
"Adjustments and Correction Constants."
power adjustments, refer to
Service Guide
Preset
PWR RANGE MAN
Table 2-8 and then press
Test Power Setting
0 dBm
5 dBm
−10 dBm
−5 dBm
Sweep Setup
Sweep Setup
and rotate the knob to the frequency in question.
CW FREQ
If failures still occur, after you have made the
Chapter 7 , "Source Troubleshooting."
System Verification and Performance Tests
POWER RANGES
.
x1
SWEEP TIME
300
TRIGGER MENU SINGLE
Performance Tests
RANGE 0
.
x1
.
Chapter 3 ,
2- 37