Operating Instructions Teledyne API Model T360/T360M Operation Manual
142
4.13.4.4. 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 4.13.4.4 and
select CU
RR 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.
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 4-12: Setup for Calibrating Current Outputs
NOTE
Do not exceed 60 V between current loop outputs and instrument ground.
