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Operating Instructions Model 360E Instruction Manual
6.13.4.4. 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
(s 5.2). This option converts the DC voltage analog output to a current signal with 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 6.13.4.4 and select CURR from the list of options on the 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 (Figure 6-16).
mA
IN OUT
V OUT +
V OUT -
I IN +
I IN -
Recording
Device
Analyzer
See Table 3-1 for
pin assignments of
the Analog Out
connector on the
rear panel.
Figure 6-16: Setup for Calibrating Current Outputs
NOTE
Do not exceed 60 V between current loop outputs and instrument ground.
To adjust the zero and span values of the current outputs, activate the ANALOG I/O CONFIGURATION MENU
(See Section 6.13.1), then press:
114 05232 Rev B3