HP 70427A User Manual page 565

NOTE
Performance Tests
Test 7 - AM Detector Noise Floor (AM NOISE)
3) Measure and adjust the calibration source power
Connect the calibration source's output to the downconverter's SIGNAL
input.
Adjust the calibration source's output power until the voltage measured by
the internal voltmeter is within ±5% of the DC voltage measured in "1"
above. This is done as follows:
a. Read the
AM Det Voltage:
b. Press the
Read AM Det
c. Repeat from "2." above until the reading on the
display doesn't change from one reading to the next.
d. If necessary, increment / decrement the calibration source's output
power.
e. Repeat "1." through "3." to read new power.
f. Repeat "1." through "4." above until the calibration source's output
power is within ±5% of the DUT's input power.
Leave the calibration source connected to the downconverter until prompted
to remove the calibration spur in step 6 below.
Step 4 - Modulate the calibration source
•
Type: Internal AM
•
Frequency: 1 kHz
•
Depth: 2%
14-54 HP 70427A/HP 70428A User's Guide
display.
softkey
AM Det Voltage