Philips 6652C - Page 22

PHILIPS
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HOLD OFF
HOLD OFF is a feature which gives the user the
opportunity of delaying the retriggering to
avoid false counts (as from relay bounce), The
hold off time is set when HOLD OFF is on (the ON
LED is alight) and by adjusting the potentio-
meter. With the potentiometer pushed, the ad-
justment range is 5t,rs to 1 ms; pulled out from
1ms
to 200ms. The value of HOLD OFF is displayed
by pressing READ. NOTE that HOLD OFF value can-
not be stored. A similar bus programmable func-
tion, the Time Interval Delay, is available on
the PM 6654C, see Chapter 5.
MEASURING TIME/DISPLAY TIME
The measuring time for continuous measurement is
set on the variable potentiometer, which has a
range of 0.1ms to 96s. To make measurements on
signals having a short duration; MINIMUM/SINGLE
is used, giving a measuring time of one cycle or
1 microsecond (PM 6652) or 2 microseconds
(PM 6654), whichever is the longer. With MINI-
MUM/SINGLE selected, the potentiometer becomes a
display time control. In this case the display
will show a measured result for the time set on
the potentiometer. It changes to the latest
measured result only after the set measuring
(i.e. display) time has expired.
260Vrma.(1M nl
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When DISPL HOLD is switched on, the counter completes
the measurement in process, "freezes" the result on the
display and stops measuring. Single measurements can
thereafter be made by pressing the RESET button. The
counter will not start continous measurements again
until DISPL HOLO is switched off.
If OISPL HOLD is pressed when TOT A/MAN is selected, the
counter will freeze the result on the display
immediately without stopping the measurement.
The
currently set measuring time is displayed
with READ.
Note that after a power down the counter will
use the measuring time set by the potentiometer
unless a stored panel program P1 •••. P8 is selec-
ted.
Measuring time can be stored in a stored panel
program.
FUNCTION
The "UP" and "DOWN" push buttons control the
movement of the function and program cursors on
the display panel. Continuous pressure causes
the cursor to "scroll", though the function cur-
sor will hesitate at FREQ A and TEST. Once past
FREQ A (going up), or TEST (going down), the
program cursor appears. When any stored panel
program cursor is lit and t.he push button re-
leased,
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