Racal Instruments 3151 User Manual page 70

Using The Instrument 3-40
PHASe 120
Use the following commands on the third Model 3151/3151A:
PHASe:SOURce SLAVe
PHASe:LOCK ON
PHASe 240
The three Model 3151/3151A modules are now synchronized.
To insure jitter free synchronization, the sample clock
rate should not exceed 67MHz
The sample clock rate has no effect on phase offset accuracy.
However, when trying to synchronize modules that are programmed
to output waveforms with few memory points, a "1 count error
between modules may be seen. To remove this error, use the
following command:
PHASe:LOCK:NULL
The PHASe:NULL command toggles between removing
one count and adding one count. Therefore, if there was
no error, sending this command may add a 1 count error.
The query:
PHASe:LOCK?
queries the Phase Lock mode and returns "0" (OFF) or "1" (ON).
The query:
PHASe?
queries the phase offset and returns a value in degrees.
In query:
PHASe:SOUR?
queries the phase lock source and returns MAST or SLAV.
3151 And 3151A User Manual
NOTE:
CAUTION