Wavetek 3000 Instruction Manual page 49

4 .5 .3 Step Attenuator Accuracy Test
EQUIPMENT
Power Meter HP435A/8481A
and Sensor
Spectrum Analyzer
HP8554L/8552B/141T
10 dB Attenuator
Pad
20 dB Attenuator Weinschel 50-20
Pad
30 dB Attenuator Weinschel 50-30
Pad
40 dB Attenuator Weinschel 50-40
Pad
Wideband Amplifier
HP8447D
26 dB
7 . Set the Signal Generator
FREQUENCY selector to 050 .000
MHz and
the OUTPUT step attenuator to 0 dBm . Adjust the
OUTPUT VERNIER for
a
-7 dBm power meter reading .
Weinschel 50-10
PROCEDURE 1 . Set the Signal Generator controls as follows :
FREQUENCY selector
520 .000 MHz
MODULATION MODE
AM
MODULATION FREQ
VERNIER
MODULATION FM/AM
0% AM
OUTPUT VERNIER
Fully Clockwise
OUTPUT step attenuator
0 dBm
PERFORMAMCF TESTS
2 . Set the power meter to the +10 dBm range .
Connect the
power sensor to the Signal Generator RF out connector .
3 .
Adjust the MODULATION FM/AM control of the Signal Gen-
erator for a +7 dBm power meter reading .
NOTE : Increasing the MODULATION FM/AM control
setting in
the preceeding step causes the OUTPUT meter needle to read
off scale .
This is normal .
8 .
Repeat step
4 above except observe the maximum change
in the power meter readings from the -7 dBm reading in step
7 . Record the maximum change from the -7 dBm reading to the
nearest 0 .05 dB on line 11 of the PTR .