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3. OPERATION
3.1 DISPLAY AND KEYBOARD
The various keys on the keyboard have the following functions (cf. Fig. 1 on the cover of
the user’s guide):
ITEM KEYBOARD
Description:
ON/OFF
Switching instrument on/off.
% mA / SETUP
Alternating between readout in mA and %. If
the key is held down for more than 2 sec., a
change to SETUP takes place. Under SETUP
this key is used to select next parameter.
AUTO
AUTO ramp or AUTO-STEP function is started
or stopped.
DOWN ARROW
“Less” key. If the key is held down, the key
press is repeated.
UP ARROW
“More” key. If the key is held down, the key
press is repeated.
STEP
The STEP function is activated or de-activated.
FUNC. (FUNCTION)
Change-over takes place between SOURCE
mA, MEASURE mA and MEASURE Volt
function.
PWR.
(POWER)
Change-over takes place between EXT. (the
+24VDC of the current loop is generated by an
external power supply) and INT. (the +24VDC
of the current loop is generated by the mAcal
itself).
The various segments of the display indicate the following (cf. Fig. 1 on the cover of the
user’s guide):
ITEM DISPLAY
SEGMENT
Description:
Shows numerical value in mA, %, V or sec.,
and for readout of error codes etc.
EXT
(EXTERNAL)
External loop supply is selected.
INT
(INTERNAL)
Internal loop supply is selected, the internal
+24VDC of the mAcal being used to supply the
current loop with power.
MEASURE
Measurement of current or voltage is selected
(indicated by unit).
SOURCE
Generation of current is selected.
STEP
The STEP function is active. When the
segment flashes, this indicates that the AUTO-
STEP function is activated.
%, s, V
or
mA
Indication of unit for readout numerical values.
