WX16 User Manual | 35
RTD or 4-20mA input. These dual position jumpers, JP1 – JP16, must both be placed
into the UP position for RTD inputs or both in the DOWN position for 4-20mA inputs
(see Figure 3.6).
Channels receiving input data from this board should have the
Data From:
menu set
for
Sensor,
as described in section 2.2.4. This activates
Cal Mode
menus, described in
section 2.2.9, needed to perform
zero
and
span
calibrations of RTD sensor readings.
Each channel must be calibrated individually by either simulating desired zero and
span calibration resistance values or by actually placing the channel’s RTD into an
actual precision temperature generator. Ice water is an acceptable method for
generating the 0°C zero temperature value. Upscale span values are best simulated
with an RTD calibrator. Since RTD’s are stable and repeatable over long time periods,
calibrations normally only need to be performed upon initial installation. Since the PCB
has 8 channels, two are required for 16-channel applications. JP25 configures inputs
for channel groups 1-8 or 9-16.
Summary of Contents for WX16
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