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Mode! 5344S
Operation and Programming
Either format will produce the same results. Depending on the controller, this can help speed
programming.
3-164.
Parameter data messages (CW, CF, DF, SR, SP, LR. Ml, M2, M3, M4, SS, ST, FM) are
usually, but not necessarily followed by a frequency. The parameter data message by itself results
in the specified parameter being displayed on the front panel.
3-165.
Special Programming Considerations
3-166.
Only the first 11 digits of a simple number are significant. Others are ignored. Also, only
the first decimal point has any effect.
3-167.
Only the first 2 digits of an exponent are significant. Others are ignored.
3-168.
The FM parameter may be terminated with any frequency units data message (GZ, MZ,
HZ).
3-169.
Output Format
3-170.
The 5344A does not have the capability to output data. The 5344A can only output status
information as described in paragraph 3-150.
3-171.
Remote Frequency Offset Locking
3-172.
To fully understand Frequency Offset Locking during remote, a few points should be
discussed.
3-173
First, the 5344A and the counter cannot be in Remote at the same time.The 5344A needs
the counter's circuitry to perform its functions. To avoid any conflict, whenever the 5344A is
placed into Remote and Lock in ON, the counter is automatically switched to Local and thefront
panel controls are locked out.
3-174.
In Frequency Offset Locking, the counter must have a frequency offset activated. The
counter always adds the offset to the frequency being counted. For
Frequency
Offset Locking the
offset value is entered as negative, such as -3.8 GHz. This can be done over the HP-IB (provided
the counter has HP-IB) using the following command string:
SOM-3800EOM1
See the appropriate counter manual for specific details.
3-175
Both the 5342A and 5343A Microwave Counters will retain any offset entered when they
return to Local. This is necessary, so when the 5344A is set to Remote, the counter will still have
the offset active. This allows the 5344S System to operate completely under remote control.
3-176.
To summarize, the following is the basic procedure for remote operation of Frequency
Offset Locking.
a.
b.
c.
Set both the counter and 5344A to Local.
Place the counter into Remote. Send the code string to enter the required frequency offset.
For example, if -3.8 GHz must be subtracted, the code string SOM -3800EOM1 would be
sent.
Place the 5344A into Remote and send the desired commands. When the 5344A goes
Remote, the counter will automatically go to Local. The frequency offset will still be active in
the counter. Remember to send the SHI command (activate Subharmonic mode).
3-73
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