Practical Instrument Electronics 850 - Manual (Page 16)

Page 14
Pr
eliminar
y
2 Wire SIM mA, 2 Wire SIM % (Percent of 4-20 or 10-50 mA)
Choose this function to simulate a 2 Wire Transmitter output from
0.000 to 24.000/0.000 to 52.000 milliamps. Operates in loops
with power supply voltages from 2 to 60 VDC.
Move the power switch
w to SOURCE then Double Click the
EZ-DIAL knob to get into the Menu. Turn the knob to scroll
through the settings and press the knob to make your selection.
Select mA for the FUNCTION and 2W SIM for the MODE.
Choose either mA or % and whether you need the 250Ω HART
resistor active in the loop (250Ω resistor is only available in
4-20mA operation).
If you would also like to see the condition of the loop turn the e
DIAL KNOB to move to the second (or third) menu page so the
word
mA RANGE appears at the top of the menu.
LOOPSCOPE turns on the Loop Diagnostic display which
simultaneously indicates the current, voltage and resistance of
the loop. When enabled the
LOOPSCOPE also indicates errors
by flashing the LED and writing diagnostic messages on the
display. Messages include
LOW LOOP VOLT, HIGH LOOP
VOLT and HIGH LOOP IMPED. With LOOPSCOPE on the 850
occasionally performs a test on the loop. During this short test
the loop mA signal will be affected.
2-WIRE
SUPPLY
25.4 V
LOAD
485 Ω
12.000
mA
2-WIRE
12.000
mA
850 with LOOPSCOPE 850 Simulating a
Transmitter
mA RANGE
> EXIT
mA RANGE 4-20mA 10-50mA
LOOPSCOPE OFF ON