HP 70427A User Manual page 538

NOTE
5. Set the output power to +10 dBm:
a. Press the
Output
b. Press the
POWER
c. Enter 10 with the numeric keypad.
d. Press the softkey.
dBm
6. Measure the DUT output with a power meter and if necessary, adjust the
DUT power for the +10 dBm ±0.5 dB.
7. Disconnect the DUT end of the HP 33330C detector.
8. Connect a power meter to the DUT output, at the point where the
HP 33330C was connected. That is, if the HP 33330C was connected to
a cable from the DUT's output, connect the power meter to the end of
the cable.
9. If necessary adjust the DUT's output power for +10 dBm ±0.5 db.
a. Press the
Output
b. Press the
POWER
c. Adjust the power with the knob (0.1 dB steps) or the Up/Down
arrow keys (1 dB steps).
When entering 0.1 dB steps the actual power may change as much as 0.2 dB.
Step 3 - Set calibration source power to equal DUT power
Power is measured by bridging the HP 3561A across the output of the AM
detector and making a DC voltage measurement.
1. Set up the HP 3561A for DC voltage measurement
Press the following HP 3561A keys:
•
VERT SCALE
softkey.
•
RANGE
softkey so that
•
DEFINE TRACE
softkey.
•
in the MARKER key group then the
MKR
so that
The Y value of the marker will indicate the dc voltage across the AM
detector. This voltage is proportional to RF output power.
Test 3 - AM Noise and Spurs (mW LO)
softkey.
softkey.
softkey.
softkey.
in the DISPLAY key group then the
in the INPUT key group then the
is underlined.
ON
in the DISPLAY key group then the
is underlined.
ON
HP 70427A/HP 70428A User's Guide 14-27
Performance Tests
LINEAR
AUTO RNG
TIME
softkey
MKR