User`s guide

2-12

Making Mixer Measurements (Option 089 Only)

Measurement Considerations

5. Measure the output power in the R channel by pressing:

Observe the 13 to 16 dB offset in measured power. The actual input power level to the R

channel input must be 0 dBm or less, −10 dBm typical, to avoid receiver saturation

effects. The minimum signal level must be greater than −35 dBm to provide sufﬁcient

signal for operation of the phaselock loop.

6. You cannot trust R channel power settings without knowing about the offset involved.

Perform a receiver calibration to remove any power offsets by pressing:

Once completed, the R channel should display the reference power (−10 dBm in this

example).

Power Meter Calibration

Mixer transmission measurements are generally conﬁgured as follows:

measured output power (Watts) / set input power (Watts)

measured output power (dBm) − set input power (dBm)

For this reason, the set input power must be accurately controlled in order to ensure

measurement accuracy.

The amplitude variation of the analyzer is speciﬁed at ±1 dB over any given source

frequency. This may give a maximum 2 dB error for a mixer transmission test setup: ±1dB

for the source over the IF range during measurement and ±1 dB over the RF range during

measurement.

Higher measurement accuracy may be obtained through the use of power meter

calibration. You can use power meter calibration to correct for power offsets, losses, and

ﬂatness variations occurring between the analyzer source and the input to the mixer

under test. Refer to the power meter documentation for its calibration procedures.

Meas

INPUT PORTS

Cal

RECEIVER CAL

−10 x1

TAKE RCVR CAL SWEEP