HP 8340B Manual page 53

4-11. PULSE MODULATION ONIOFF RATIO TEST
THIS TEST IS NOT APPLICABLE TO INSTRUMENTS EQUIPPED WITH
OPTION 006, DELETE PULSE MODULATION
Specification
For CW mode and RF frequencies =400 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).
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.
50
TERMINATION
HP 8340B/41B
Table 4-24. Pulse Modulation ON/OFF Ratio Test Specifications
HP 8340B/418
UNDER TEST
fl
Figure 4-11. Pulse Modulation ON/OFF Ratio Test Setup
NOTE
NOTE
SPECTRUM ANALYZER
ADAPTER
APC—3. 5( I~
(in)
TO N
Performance Tests 4-55