103887 01
7
Press
for automatic changing of current value. If STEP is selected
(the AUTO-STEP function), change-over takes place automatically between the pre-
defined current values. For proportional transmitters (VALVE), change-over takes
place between 3.8 - 4 - 4.2 - 4..... and 19 - 20 - 21 - 20..... mA
(the range is selected using the “up arrow” or “down arrow” keys).
The mAcal now generates the current shown in the display.
3.4 HOW THE CURRENT IS MEASURED
Connect the mAcal to the transmitter to be tested as shown in Fig. 5 or Fig. 6 on the cover
of the user’s guide and switch the unit on.
Press
until the display shows
MEASURE mA
or
MEASURE %
Press
for selection of INT or EXT (the present selection is
shown in the display).
If INT is selected, the +24VDC of the current loop is generated by the mAcal itself. If EXT is
selected, the +24VDC of the current loop is generated by an external power supply.
Press
for selection of readout in mA or %.
The display thus has the following appearance in the measurement of 20mA in the current
loop.
The current is printed out with a resolution of 0.001mA:
The mAcal now measures the current shown in the display.
3.5 HOW THE VOLTAGE IS MEASURED
Connect the mAcal to the instrument to be tested as shown in Fig. 7 on the cover of the
user’s guide and switch on the unit.
Press
until the display shows
MEASURE V
. Readout in %
cannot be selected.
The display thus has the following appearance in the measurement in V. The voltage is
printed out with a resolution of 0.1Volt:
