Simulation Mode For Ma Output - Agilent Technologies U1401A User's Manual And Service Manual

5 Application Examples

Simulation Mode for mA Output

C A U T I O N
88
Always use the supplied special yellow test lead to perform mA
simulation.
Disconnect the test lead from the current loop before turning the rotary
switch to change function or to power-off this instrument. Failure to do
so will result in a current of at least 16 mA in the 250 Ω load connected
loop.
In simulation mode, the instrument simulates a current loop
transmitter. Use this simulation mode when an external DC
24 V or 12 V supply is in series with the current loop being
tested. Always use the special yellow test lead. Follow the
procedure below when performing mA output simulation.
1 Turn the rotary switch to any one of the
or /
2 Connect the special yellow test lead between the positive
output terminal of the instrument and the positive
terminal of the measurement device on the current loop.
Refer to Figure 5- 2
3 Connect the black alligator lead between the COM terminal
of the loop source and the negative terminal of the
measurement device on the current loop.
4 Connect the red alligator lead between the negative output
terminal of the instrument and the positive terminal of
the current loop source. Make sure the polarity is correct.
5 Set the current level of the calibrator between 0 mA and
20 mA. Do not set a negative current output value.
6 Press OUTPUT to output the test current.
This connection can be used for any loop voltage from 12 V
to 30 V.
positions.
on page 89.
U1401A User's and Service Guide
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