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47DAC OPERATING MANUAL EM-9518-B Rev.4
24. LOOP TESTING
The 47DAC can provide simulated analog output with the display value manually adjusted. It is called loop test output. It is
convenient to check or calibrate a receiving instrument. The alarm trip and the BCD output function according to the scal-
ing values during the loop test.
24.1 LOOP TEST OUTPUT RANGE
-10 to +110% of the display scaling span can be set manually.
e.g. With the display scaling values 0.00 to 100.00, setting manually within the range of -10.00 to 110.00 is available.
The DC output is provided within the range of -10 to +110% of the output span. The output is saturated at approximately
-10% or 110%.
e.g. With the DC output 4 – 20 mA DC, the output can be provided within the range of 2.4 to 21.6 mA DC.
NOTE
• Loop Test Output Mode can be used only with the DC output option.
• Do not attempt to write via Modbus while in Loop Test Output Mode.
• With the latching alarm set to “output latched / measuring continued”, when the display value reaches a setpoint in Loop
Test Output Mode, the alarm output is held, and even back in Measuring Mode. Reset the latching alarm.
• With the latching alarm set to “output latched / measuring stopped”, when the display value reaches a setpoint, the
alarm and DC outputs are held. However the BCD output follows the display value. The outputs are still held back in
Measuring Mode, and therefore the BCD output is also held with the input value. Reset the latching alarm.
