1
Performance Verification and Adjustments
26
Keysight 8990B Service Guide
1
Connect the standard sensor (N8481A/N8487A) to the power meter's channel
A and the incident sensor (N8481A/N8487A) to the power meter's channel B.
2
The equipment setup is as shown below.
Figure 1-2
Equipment setup for low power verification
3
Zero and calibrate the standard and incident sensors on channels A and B
respectively.
4
Set the frequency of the signal generator to 50 MHz and the power level to
0 dBm. Turn on the RF output.
5
Set the frequency of the power meter's channels A and B to the same
frequency as the signal generator.
6
Measure the standard power (P
STD
) of channel A and the incident power
(P
INC1
) of channel B. Compute and record the power ratio (P
ratio
) of these
channels for the current frequency and power level, based on the following
equation:
7
Repeat steps 4 to 6 for other frequencies with the same power level.
8
Turn off the RF output of the signal generator.
9
Remove the standard sensor from the test port.
10
Replace it with the 8990B and N1923A/N1924A power sensor, which is the
device-under-test (DUT).
Signal generator
Power splitter
Standard sensor
Incident sensor
Power meter
A
B
P
ratio
dB
(
)
P
STD
P
INC1
–
=
Содержание 8990B
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