Specifications

Chapter 13 119
Stimulus Response Measurements (ESA Options 1DN and 1DQ)
Making a Reflection Calibration Measurement
Stimulus Response Measurements
(ESA Options 1DN and 1DQ)
Step 5. Turn on the tracking generator and set the output power to –10 dBm:
Press
Source, Amplitude (On), –10, dBm.
CAUTION Excessive signal input may damage the DUT. Do not exceed the
maximum power that the device under test can tolerate.
Step 6. Set the center frequency, span and resolution bandwidth:
Press
FREQUENCY Channel, Center Freq, 200, MHz.
Press
SPAN X Scale, Span, 100, MHz.
Press
BW/Avg, Res BW, 3, MHz.
Step 7. Replace the DUT with a short circuit.
Step 8. Normalize the trace:
View/Trace, More, Normalize, Store Ref (1→3), Normalize (On).
This activates the trace 1 minus trace 3 function and display the results
in trace 1 (see Figure 13-8). The normalized trace or flat line represents
0 dB return loss. Normalization occurs each sweep. Replace the short
circuit with the DUT.
NOTE Since the reference trace is stored in trace 3, changing trace 3 to
Clear Write invalidates the normalization.
Figure 13-8 Short Circuit Normalized