Chapter 5 255
Post-Repair Procedures
Baseband I/Q Amplitude Accuracy Test
Baseband I/Q Amplitude Accuracy Test
Description
The amplitude accuracy test measures the absolute amplitude of the
baseband I/Q inputs at 100 kHz and 5 MHz. An arbitrary waveform
generator or synthesized signal generator is used as the signal source
for the test. Most input configurations and ADC voltage ranges for the
baseband I/Q signal path are tested.
Test Limits
Amplitude accuracy results should remain within +/-1 dB of the
measured source value for all input connector and impedance settings.
Procedure
1. Press Mode, then Basic to select the Basic mode for the UUT.
2. Press
Preset to preset the UUT.
3. If the auto alignment for the UUT has not been run within the last
hour, press
System, Alignment, then Align All Now to activate the
alignment.
4. Initialize the parameters for the instrument as listed in Table 5-6 by
following these steps:
a. Press
Input, Input Port, I only.
b. Press
Input, I/Q Setup, I/Q Input Z, 50 ohms Unbalanced.
c. Press
Meas Setup, Span, 200kHz.
Table 5-6 UUT Initialization for 100kHz Test
Parameter Setting
Mode Basic
Measure Spectrum
Input Input Port I only
I/Q Setup I/Q Input Z 50 ohms
I/Q Z Ref 50 ohms
I/Q Range 1 Volt
Span 200 kHz
Resolution Bandwidth 4 kHz
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