User`s guide

Agilent E6432A Microwave Synthesizer User’s Guide 3-131
Soft Front Panel Help
I/Q Calibration (Option UNG Only)
4. Enter an I/Q Upconverter Calibration Frequency from
2GHz</=20GHz.
The I/Q Upconverter calibration is only valid for synthesizer
frequencies between 2 GHz </= 20 GHz. The I/Q Upconverter
calibration cannot be used for synthesizer frequencies from
10 MHz < 2 GHz.
For synthesizer frequencies from 10 MHz < 2 GHz, a Power Search
may be used to improve level accuracy with ALC off. Alternately, the
IFAttenuator, available from the pull down View menu by selecting
Configuration, can be adjusted in 2 dB steps to obtain the correct
level within +/- 1 dB; above 2 GHz or with ALC on, this is
unnecessary because the I/Q Upconverter calibration controls the
level accuracy.
5. Select the Calibrate I/Q Upconverter button.
Performing this calibration supersedes the calibration DAC settings
obtained from running IF Upconverter Level Calibration
(Option 300 Only).
6. From the pull down View menu, point to Calibration, and select I/Q
External Source Adjustments.
7. When the External I/Q Source Adjustments Dialog Box appears,
select Normal as the I/Q Input.
8. Configure the External I and Q Source generators to produce signals
with equal levels, with a quadrature phase relationship (I input is a
cosine wave and Q input is a sine wave), and both at the same
frequency (for example, 10 kHz).
The recommended input level is Sqrt(I^2 + Q^2) = 0.5 Vrms. With
equal signal levels applied to the I and Q inputs, this is equivalent to
0.35 Vrms on each input.