HP 70427A User Manual page 564

NOTE
Step 2 - Configure the DUT
1. Make sure the DUT is the active MMS module (ACT indicator lit):
a. Press the
DISPLAY
b. Press the
NEXT INSTR
lights.
2. Press the
INSTR PRESET
3. Put the downconverter in input AM noise mode.
a. Press the
AM Noise
b. Press the
AM NSE IN|IF
4. Set input power to +10 dBm.
a. Disconnect the cable from the downconverter's SIGNAL input and
connect it to the power sensor.
Make sure the measuring receiver has the sensor modules cal factors entered
and that the 600 MHz test frequency has been entered.
b. Adjust the 1 dB step attenuator for a power meter reading of
+10 dBm, ±0.5 dB.
c. Re-connect the cable from the step attenuator to the downconverter's
SIGNAL input.
d. Autorange the downconverter's input attenuator: Press the
softkey.
ATTEN
Step 3 - Set calibration source power to equal DUT input power
The calibration source power and the DUT input power are compared by
measuring the DC voltage at the AM detector's output with the
downconverter's internal voltmeter.
1) Measure and record the DUT input power
a. Read the AM Det Voltage: display.
b. Press the
Read AM Det
c. Repeat from "2." above until the reading on the AM Det Voltage
display doesn't change from one reading to the next.
2) Set up the calibration source
a. Frequency: 600 MHz
b. Power: +10 dBm
c. Modulation: OFF
Test 7 - AM Detector Noise Floor (AM NOISE)
key.
softkey until the DUT's ACT indicator
key.
softkey.
softkey until is underlined.
IN
softkey
HP 70427A/HP 70428A User's Guide 14-53
Performance Tests
AUTO