4 MEASUREMENT CONDITIONS SETTING
89
To enable/disable frequency offset mode, click softkeys:
Stimulus > Frequency Offset > Frequency Offset
To enter offset coefficients for port 1, click softkeys:
Stimulus > Frequency Offset > Port 1 > Multiplier | Divider |
Offset
To enter offset coefficients for port 2, click softkeys:
Stimulus > Frequency Offset > Port 2 > Multiplier | Divider |
Offset.
4.11.3 Automatic Adjustment of Offset Frequency
When you perform mixer measurements in frequency offset mode, you need to set the
offset frequency equal to LO frequency. The accuracy of the offset frequency setting
must be no less than IF filter bandwidth, otherwise, the receiver will not get the output
signal from the mixer. In practice, there is always some LO frequency setting error
(unknown to the user) when the tested mixer has an internal LO.
The Analyzer offers the automatic adjustment function of the offset frequency. This
function enables you to accurately set the offset frequency equal to the frequency of the
internal LO of the DUT.
Automatic adjustment function of the offset frequency can be activated only for one
port. The value of the offset frequency automatic adjustment will be indicated in the line
of the respective port in the channel window (See figure 4.20).
The automatic adjustment can be made within ±500 kHz range from the offset
frequency set by the user. The function can be enabled/disabled by the user. Adjustment
can be performed upon key pressing, or continuously with the set time interval.
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