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5.2 Current Input
The CL3001 can measure DC current from 0 mA to 50 mA.
a) Disconnect any test leads from external devices.
b) Press the
key to select isolated DC voltage and current
input mode, if not already selected. If the DC current mode is
not displayed, press the key again to cycle to it.
c) Connect the unit under test to the isolated voltage/current input
terminals of the CL3001 as shown in figure 18.
Figure 18 - Isolated DC Current Input Connection
d) If the UUT is a 2 wire loop powered transmitter that is
disconnected from the wiring, press the
key to activate
the CL3001 internal 24V supply in series with the current
measuring circuit. The top line changes to 24mA LPWR to
indicate that the supply is activated. Press the key again to
deactivate the supply, and the top line reverts to 50mA RANGE.
e) If a 250 ohm resistor is required during a HART calibration
procedure, press the
key to switch in the CL3001 internal
250 ohm resistor. The word HART is appended to the top line of
the display to indicate that the resistor is switched in. Press the
key again to switch out the resistor, and the display reverts to its
previous state. This resistor lowers the maximum load driving
capability from 1000 ohms at 20 mA to 750 ohms at 20 mA.
5.3 Pressure Input
The isolated pressure display uses the same physical pressure
connector as the primary display. It is possible to have both displays
selected to pressure simultaneously, showing the same source in
different pressure units. See section 4.9 for a general discussion on
pressure module selection.
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Содержание CL3001
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