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4.4.2 Constant Current Output (SIMULATE mode)
When the SIMULATE (SINK) function is enabled, the CA450 can sink the specified amount
of current from an external voltage source (such as a distributor) through the SI)
terminal, and you can use the CA0 to simulate a two-wire system transmitter in a loop test.
(You can connect the CA0 instead of a transmitter to test a transmitter or signal conditioner.)
CAUTION
• When sinking 20 mA from an external power source, keep the voltage within the
range of to 8 V.
•
Set the polarity of the applied voltage as shown in the figure below, and be careful
not to apply voltage in the opposite direction.
Transmitter (signal conditioner)
Distributor
SIMULATE
(SINK)
Two-wire system transmitter
4 to 20 mA
Black
Red
) Turn the function switch to the “
” position.
After you turn the function switch, “OUTPUT” appears on the screen, and the output is
set to 0% of the current span setting.
(If you turn the function switch from the “
” position to the “
” position, the
output value setting and SOURCE/SIMULATE setting are retained.)
2) Press the SHIFT key. “SIMULATE” appears. (Current sinking starts.)
