Chapter 11 87
IQ Waveform (Time Domain) Measurements
Measurement Procedure
Measurement Procedure
Step 1. Press Mode, TD-SCDMA with HSPA/8PSK to enable the TD-SCDMA with
HSPA/8PSK mode measurements.
Step 2. Press
Mode Preset to preset the analyzer.
Step 3. Select the signal inputs for the measurement.
For BBIQ measurements this will be the I or I input and the Q or Q
input. Use the procedure in “Using Option BBA Baseband I/Q Inputs.“
Step 4. Press
Input/Output, External Gain, BTS and enter the number and −dB
according to the external attenuator connected to the analyzer.
Step 5. Press
Mode Setup, Radio, Device to toggle the device to BTS.
Step 6. Press
Meas, IQ Waveform to initiate the IQ Waveform measurement.
Step 7. Press
Trigger to select the appropriate trigger source.
If no measurement is performed and only a symbol of yellow ‘*’ displays
on the top right of the screen, you need to check the trigger settings.
You need the correct trigger signal to make the IQ Waveform
measurement.
Step 8. Press
FREQ Channel, 2, GHz to set the center frequency to 2 GHz.
Step 9. Press
View/Display to select the desired view from the following views.
•RF Envelope
• I/Q Waveform
Step 10. Press
SPAN X Scale to set the span so that the waveform is shown at a
convenient time scale for viewing.
Step 11. Press the
AMPTD Y Scale, and down arrow keys until the waveforms are
shown at a convenient voltage scale for viewing.
Step 12. Press the
Marker, Select Marker, keys to activate a marker. Rotate the
RPG knob until the marker is shown at a desired time in the waveform
for viewing the trace values at the time position of the marker.
Step 13. To make a measurement repeatedly, press
Cont.
Step 14. Press the
Meas Setup key to see the keys available to change the
measurement parameters from the default condition.
For more details about changing measurement parameters, see
N9079A TD-SCDMA with HSPA/8PSK User’s and Programmer’s
Reference.
If you have a problem, and get an error message, see the “Instrument
Messages Guide”.
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