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48
6.4.6.
Starting
The start made is selected by pressing one of the START push-buttons. A LED in the push-button knob
indicates which start mode is selected. The following start modes are possible.
f
iNT START
:
a measurement is started automatically after completing the previous one.
EXT START:
a measurement can be started externally via the
|
— BNC connector at the rear of the PM2528
— A measurement is started by making this input low (see fig. 14)
The EXT start input is galvanically separated from the measuring circuit,
— 1EC-bus interface PM9291 (see relevant specification, page 31).
— BCD parallel output PM9292 (see relevant specification, page 28).
MAN START:
By pressing the push-button MAN once, one measurement is performed. At AUTO
RANGING
first the correct range is selected and then a new measurement is performed and displayed.
"Q"=~20V...+1V
or
short-circuited BNC input.
Hl
y's 42,4V.,20V
or
open BNC input.
.
Fig. 14, Start pulse for EXT START input.
Remarks
@
Notice the different meaning of START INT and START EXT in the V * and Vv
function (page 55).
@
Switching to another function and up-ranging or down-ranging in the EXT and MAN start mode will
cause a displayed value in which the digits are replaced by dashes e.g, —~~-—.-— k Q.
After performing a measurement the measured value will be displayed.
@
Selecting or switching off the OFFSET and HIGH RES mode becomes effective only after performance
H
of a measurement.
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