Figure 1-2 Equipment Setup For Low Power Verification - Keysight 8990B Service Manual

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