HP 5335A - Page 39

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Operation and Programming
3-109. TOT A
3-110. The TOT A mode will display the number of counts (events) received in Channel A.
When TOT A is selected, the 5335A will automatically shift the GATE MODE from NORM to
MANUAL, with the Gate initially closed. Pressing the MANUAL key opens the Gate and
allows counts to accumulate. To stop counting, press the MANUAL key again. Pressing the
MANUAL key once more allows counting to continue without resetting the previous total.
To zero the count, press RESET. To begin a new measurement, close the gate and then press
RESET. RESET is independent of the Gate.
NOTE
SMOOTH and MATH operations using “MEASt-i” will not oper¬
ate in manual totalize.
3-111. In other gate modes TOT A behaves slightly differently. With GATE MODE set to NORM
or FAST, the totalize acts somewhat like a frequency measurement. Based on the CYCLE and
ARM modes, the totalizing will start and stop without the need for manual operation. Also,
between measurements, the count will automatically reset itself.
3-112. To totalize the number of events in a burst of pulses which occur at one second
intervals, set the GATE MODE to NORM. Adjust the GATE ADJ control for a gate time of just
under one-second (=0.8 s). Set CYCLE to MIN. At a one-second rate, the counter will update the
display by the number of counts in each burst. The counter will reset and arm itself automatically
for each cycle.
CHANNEL A
BURST REP RATE
L ADJUSTED GATE TIME
3-113. To totalize the number of events within a specified window, connect an externally
generated arming signal to the rear panel ARM input. Set the START SLOPE switch to negative
and the STOP to positive. Press EXT ARM ENABLE, and the counter will display the number of
events within the window, if only the start point is specified by the ARMING signal, you may set
the STOP SLOPE switch to OFF, and specify the stop point by putting the GATE MODE into FAST
or NORM and setting the GATE ADJ control (as in paragraph 3-107). The SMOOTH and MATH
operations can also be used for any totalize CATE MODE except MANUAL.
CHANNEL A
ARMING SIGNAL
EVENTS
j WINDOW '
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3-114. Normally, the total is not sent to the HP-IB bus until the gate is closed. Some applications
call for the total to be sent while the gate is still open and allowing counts. This is called totalize
on the fly. To totalize on the fly put the counter in Totalize and set the GATE MODE to MANUAL
and the CYCLE MODE to SINGLE. Start the count by pressing the MANUAL key. Data will
then be sent on the fly during counting and once after the gate is closed. Data is sent only if
two successive readings of the counting registers are equal, thus assuring an accurate reading.
3-23
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