2-20
Making Mixer Measurements (Option 089 Only)
High Dynamic Range Swept RF/IF Conversion Loss
High Dynamic Range Swept RF/IF Conversion Loss The frequency offset mode enables the testing of high dynamic range frequency converters
(mixers), by tuning the analyzer’s high dynamic range receiver above or below its source,
by a fixed offset. This capability allows the complete measurement of both pass and reject
band mixer characteristics.
The analyzer has a 35 dB dynamic range limitation on measurements made directly with
its R (phaselock) channel. For this reason, the measurement of high dynamic range mixing
devices (such as mixers with built in amplification and filtering) with greater than 35 dB
dynamic range must be made on either the analyzer’s A or B channel, with a reference
mixer providing input to the analyzer’s R channel for phaselock.
This example describes the swept IF conversion loss measurement of a mixer and filter.
The output filtering demonstrates the analyzer’s ability to make high dynamic range
measurements.
Set Measurement Parameters for the IF Range
Set the following analyzer parameters:
NOTE No reduction in source output power is required for the 8722ES.
Perform a Power Meter Calibration Over the IF Range
1. Calibrate and zero the power meter.
2. Connect the measurement equipment as shown in Figure 2-16.
CAUTION To prevent connector damage, use an adapter (part number 1250-1462) as a
connector saver for R CHANNEL IN.
Preset
Start 100 M/µStop 1G/n
Power −5
PWR RANGE MAN
x1
Sweep Setup
NUMBER of POINTS
10 x1