HP 8340B Manual page 57

4-11.
PULSE MODULATION ON/OFF RATIO TEST
NOTE
THIS TEST
IS NOT APPLICABLE TO INSTRUMENTS EQUIPPED WITH
OPTION 006. DELETE PULSE MODULATION
Specification
Table 4-24. Pulse Modulation
ON/OFF
Ratio Test Specifications
For
CW mode
and
RF frequencies s400
MHz
only:
On/Off
Ratio:
>80 dB
Description
The DUT under test
is
set to
a
CW
frequency at
0 dBm. The RF output
level is viewed
on a spectrum
analyzer.
A
reference level
is
set
on the spectrum
analyzer
display, the
PULSE
key
is
pressed
(ON).
NOTE
The 50 ohm termination
on
the DUT's PULSE input simulates the RF OFF
state when PULSE
is
selected (ON).
The
difference between
the two spectrum analyzer displayed levels is
the pulse
ON/OFF
ratio.
HP 8340B/41B
UNDER TEST
SPECTRUM ANALYZER
50(1
TERMINATION
ADAPTER
APC-3.5(fl
TO N (m)
SEMI-RIQIO
CABLE
Figure 4-11. Pulse Modulation
ON/OFF
Ratio Test Setup
HP 8340B/41B
Performance Tests