User`s guide

2-11
Making Mixer Measurements
Measurement Considerations
The following steps can be performed to observe this offset in power:
1. To set the power range to manual, press:
Setting the power range to manual prevents the internal source attenuator from
switching when changing power levels. If you choose a different power range, the R
channel offset compensation and R channel measurement changes by the amount of the
attenuator setting.
2. Connect the analyzer source output, port 1, directly to the R channel input as shown in
Figure 2-9.
CAUTION To prevent connector damage, use an adapter (part number 1250-1462) as a
connector saver for R CHANNEL IN.
Figure 2-9 R Channel External Connection
3. To activate the frequency offset mode, press:
Since the LO (offset) frequency is still set to the default value of 0 Hz, the analyzer will
operate normally.
4. 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.
Power
PWR RANGE MAN
0 x1
System
INSTRUMENT MODE
FREQ OFFS MENU
FREQ OFFS ON
Meas
INPUT PORTS
R