U3022AH10
High Power Measurements
12.
Verify the gain of the booster amplifier(s). For example
,
if the PNA-X output power level is –20
dBm and the output power measured from the Output of the coupler is –5 dBm, the gain of
the booster amplifier would be +15 dB.
13.
Verify that the power measured in the previous step is less than +43 dBm for the 20 watt
configuration, or less than 30 dBm for the 1 watt configuration. Reduce the PNA-X power level
if needed. Save this state as User Preset to avoid an over power condition. This is the
maximum power level setting of the PNA-X.
14.
Turn Off the Booster Amplifier.
Setting the Power Level at the Output of the DUT
This procedure determines the required power level to the input and output of the DUT.
1. Connect the external Coupler Output to ODD PORTS, SRC IN or the desired source ports
CPLR THRU.
2. Install the isolators inputs to the SRC OUT, and the isolator outputs to the CPLR THRU
connector for of all other ports. (If using ports 13 or 14, install isolators as well). This will
protect the Test Set switch loads, and the PNA-X source. The isolators placement is
important to ensure that the signal is attenuated into SOURCE IN. The reverse attenuation or
isolation factor of the isolator should be 20 dB or greater.
3. Turn On the Amplifier.
4. Select S11 and measure the power at Port 1 on the PNA-X, using the power meter. If you are
using another port as the source port, set Sxx to the port desired. For example, S33 would be
Port 3. Ensure the power is less than +43 dBm for the 20 watt configuration, or less than 30
dBm for the 1 watt configuration.
5. Reduce the PNA-X power to a minimum.
Failure to reduce the input power to the DUT may result in damage.
6.
Connect the port source output to the input of the DUT.
7.
Measure the power level out of the DUT. Increase the PNA-X power level to determine the
DUT’s desired input or compression level. This value will be used to determine the receiver
input attenuator values. Save this state to recall the power level for the Input power level to
the DUT. The power level should not be above the level that was determined in
U3022AH10 User's and Service Guide
63
