AOIP CALYS 150, Инструкция по эксплуатации, Страница: 123 / 194

Measurement on channel V1
B
NTA47224-300A9 123 / 194
Measuring current
Display the MEASUREMENT MENU dialogue box:
Select the Idc measurement function then the correct range of measurement using the function and navigation
keys.
Confirm with ENTER.
Depending on the range selected, several modes of measurement are available:
Range 100 mA 4-20 mA 0-20 mA
Resolution 0.1 µA 0.1 µA 0.1 µA
Input impedance < 30
Ω
< 30 Ω
< 280 Ω if HART ON
< 30 Ω
< 280 Ω if HART ON
Loop power supply No Possible Possible
Set to scale No Linear or square law Linear or square law
If loop power supply is on, the connection is made between terminals 4-w and mA.
In this case, the CALYS 150 supplies a passive transmitter with 24 V and at the same time measures the current established
by the transmitter.
If the loop power supply is off, the connection is made between terminals mA and COM.
When set to the square law scale, the calibrator takes the square root of the input and displays the result as a percentage.
For example, if the calibrator is connected to the output of a differential pressure transmitter, it displays a result proportional
to the flow rate.
If the input current x varies between a and b, the scale is set according to the formula:
( ) (
)
( )
a b
a x
a b a y
−
−
− + =