Specifications

6-8 FREQUENCY
TRANSLATING
GROUP DELAY
MEASUREMENT
The measurement process consists of generating the modulating signal,
modulating the source, demodulating the received signal, and performing
the phase comparison. The modulating signal is generated in the Option
Module and is fixed at 453.125 kHz. The modulating signal is input to J5
of the Source Module 1 to modulate the source signal.
The demodulating of the received signal is done in the Option Module.
The phase comparison is done in the DSP section of the Receiver PCB.
If the instrument fails the Frequency Translating Group Delay test, re
-
place the assemblies in the following order:
1. Option Module
2. Source Module 1
3. Receiver PCB
NOTE
The Option Module is also used to perform a Noise Figure
Measurement. Perform a Noise Figure Measurement calibra-
tion and operational check if the Option Module is replaced.
TROUBLESHOOTING GROUP DELAY
MS462XX MM 6-27/6-28