694 Keysight N9038A MXE Service Guide
Tests
Frequency Response (Flatness)
RF Input 2
9. Move the power splitter from RF Input 1 to RF Input 2.
10.Select RF Input 2 on the receiver by pressing Input/Output, RF Input, RF
Input Port, RF Input 2.
11.Tune the receiver to a center frequency of 50 MHz by pressing FREQ
Channel, Center Freq, 50 MHz.
12.On the receiver, press Restart.
13.Set the signal generator output power to -4 dBm.
14.Perform the following steps for each row listed in Table 22-18:
a. Tune the receiver center frequency to the value listed in the Center
Frequency column of Table 22-18 by pressing FREQ Channel,
Center Freq, [Value]
b. Tune the signal generator frequency to the value listed in the Center
Frequency column of Table 22-18.
c. Enter the power sensor calibration factor into the power meter for
the signal generator frequency.
d. Adjust the signal generator output power for a power meter reading
of -10 dBm ±0.1 dB.
e. Enter the power meter amplitude value into the Power Meter
Amplitude column of Table 22-18.
f. On the receiver, press Restart.
g. On the receiver, press Peak Search to position the marker on the
peak of the signal.
h. Enter the receiver marker amplitude value into the Receiver
Amplitude column of Table 22-18.
i. Calculate the measurement error using the following equation, and
record the results under the Measurement Error column in Table
22-18:
Measurement Error = Meas_Amp − Power_Meter
j. Calculate the frequency response error normalized to 50 MHz using
the following equation, and record the results under the Normalized
to 50 MHz column in Table 22-18:
Normalized to 50 MHz = Meas_Error − Meas_Error @ 50 MHz
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