518 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Functional Tests
Amplitude Accuracy at 50 MHz
FREQ Channel, Center Freq, 50, MHz
SPAN X Scale, 2, MHz
AMPTD Y Scale, Attenuation, Mech Atten, 10, dB
Input/Output, RF Input, RF Coupling, select DC
Sweep/Control, Sweep Setup, Swp Time Rules, SA - Accuracy
Meas Setup, Average/Hold Number, 20, Enter
Trace/Detector, Trace Average
Single
7. Perform the following steps for each row listed in Table 17-4:
a. Set the synthesized sweeper amplitude to the value listed in the
Nominal Source Amplitude column in Table 17-4.
b. Set the Mech Atten as indicated in the Attenuation column in Table
17-4.
c. Set the Span as listed in the Span column of Table 17-4.
d. Record the synthesized sweeper amplitude, as measured by the
power meter, in the Power Meter Amplitude column of Table 17-4.
e. On the signal analyzer, press Restart.
f. Wait for the signal analyzer to finish averaging.
g. Press Peak Search.
h. Record the signal amplitude, as measured by the analyzer in the
Measured Amplitude column of Table 17-4.
i. Calculate the signal amplitude accuracy error using the following
equation, and record the results under the Amplitude Accuracy
Error column:
Amplitude Accuracy Error = Meas_amp - Power_meter
Table 17-4 Amplitude Accuracy Results
Nominal
Source
Amplitude
(dBm)
Attenuation
(dB)
Span
(MHz)
Measured
Amplitude
Meas_amp
(dBm)
Power Meter
Amplitude
Power_meter
(dBm)
Amplitude
Accuracy
Error
(dB)
Test Limit
(dB)
-4 10 2 ±1.13 dB
-9 10 1 ±1.13 dB
-14 10 0.5 ±1.13 dB
-4 20 0.1 ±1.13 dB
-14 20 0.1 ±1.13 dB
-4 30 0.1 ±1.13 dB
-14 30 0.1 ±1.13 dB
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