5.e TRACK/HOLD FUNCTION
See Section 5.b, above, for instructions on setting a 3500 Series instrument to
TRACK/HOLD mode. When a 3500 instrument is in TRACK/HOLD mode, it can be
commanded to freeze the analog input signal in any of three ways:
1. By the front-panel PEAK/TRACK button (WHEN THE "PEAK" TERMINAL OF
THE REAR LOGIC I/O CONNECTOR IS AT "LOGIC 0"). Pressing this button
once will place the unit in "HOLD" MODE, if the "PEAK" terminal is disconnect-
ed (i.e., at "Logic 0").* The existing analog input reading will be held without
decay, regardless of the subsequent behavior of the input signal. Pressing
the button once more will return the unit to "TRACK" MODE.
2. By a PEAK (PEK) command applied via the RS-232/485 Interface (WHEN THE
"PEAK" TERMINAL OF THE REAR LOGIC I/O CONNECTOR IS AT "LOGIC 0"). A
command of
PEK=ON [CMT]
will place the unit in "HOLD" MODE, if the "PEAK" terminal is disconnected (i.e.,
at "Logic 0").* A command of
PEK=OFF [CMT]
will return the unit to "TRACK" MODE.
3. By a LOGIC-STATE TRANSITION at the "PEAK" terminal of the rear Logic I/O
Connector. Thus, a transition from Logic 0 to Logic 1 will place the unit in
"HOLD" MODE, while a transition from Logic 1 to Logic 0 will return it to
"TRACK" MODE, regardless of the last-entered PEAK (PEK) command or the
current state of the PEAK/TRACK button.
5.7
RUN-TIME OPERATION
5
5.e TRACK/HOLD FUNCTION
* When the "PEAK" terminal is connected to GROUND (i.e., at the "Logic 1" level), both the
PEAK/TRACK button and the PEAK (PEK) command are disabled.
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