Martel Electronics BetaGauge 330 - Manual (Page 17)

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Figure 6
5. Measuring and Generating Current (4 to 20 mA)
1. To measure current use the input terminals in the front of the calibrator. Select the mA
function on the lower display. Current is measured in mA and percentage of range.
The range on the calibrator is set to 0% at 4 mA and 100% at 20 mA.
For example:
If the current measured is displayed as 75% then the mA value is 16 mA.
Note: The display will indicate “OL” when the measured current exceeds the nominal
range of current measurement (24 milliAmps).
2. To source current the same connections are used. From the configuration screen
select mA source or mA Sim-2W.
3. Note that this function can only be done on the LOWER screen. Also in the source
mode the calibrator will generate 0 to 24 mA using its own internal 24 volt supply
whereas in the simulate mode the calibrator acts as a 2 wire transmitter and requires
an external 24 volt supply.
4. Pressing any of the arrow keys will start the output mode and allow you to use the
arrow keys to adjust the mA output. The function keys can also be used to step the
output in either 25% steps (4, 8, 12, 16, 20 mA) or 0% (4 mA) and 100% (20 mA).
5. While in the mA output mode if the loop is opened or the compliance is exceeded the
unit will flash “OL” .