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Operating Instructions Teledyne API M100E Analyzer Operation Manual
108
6.9.4.5. CURRENT LOOP OUTPUT ADJUSTMENT
A current loop option is available and can be installed as a retrofit for each of the analog outputs of the analyzer
(refer to Section 5.3). This option converts the DC voltage analog output to a current signal wit
h 0-20 mA output
current. The outputs can be scaled to any set of limits within that 0-20 mA range. However, most current loop
applications call for either 2-20 mA or 4-20 mA range. All current loop outputs have a +5% over-range. Ranges
with the lower limit set to more than 1 mA (e.g., 2-20 or 4-20 mA) also have a -5% under-range.
To switch an analog output from voltage to current loop after installing the current output printed circuit
assembly, follow the instructions in Section 6.9.4.1 and select CURR from the list of options on the “Output
Range” menu.
Adjusting the signal zero and span values of the current loop output is done by raising or lowering the voltage of
the respective analog output. This proportionally raises or lowers the current produced by the current loop option.
Similar to the voltage calibration, the software allows this current adjustment to be made in 100, 10 or 1 count
increments. Since the exact current increment per voltage count varies from output to output and from instrument
to instrument, you will need to measure the change in the current with a current meter placed in series with the
output circuit (refer to Figure 6-27).
Figure 6-27: Setup for Calibrating Current Outputs
NOTE
Do not exceed 60 V between current loop outputs and instrument ground.
04515F DCN6048