Martel Electronics 320 User Manual
Page 29
Function to calibrate
Required ref source
Volts In
10VDC
±
.01%
mA In
20mA
±
.01%
pressure; zero, span
pressure at 0%, 25%,
linearity
50%, 75%, 100% of
scale. Accuracy should
be 3 times better than the
Model 320 range.
The sequence required to perform the calibrations is
(1) apply the required calibration source, (2) observe
the reading on the Model 320, (3) if the reading on the
320 is outside of the required tolerance, enter the
desired reading. If the reading is correct, proceed to
the next calibration step.
The pressure ranges are calibrated using the
engineering units that were selected when calibration
mode is activated. Ensure that the proper engineering
units are selected before entering the calibration mode.
Also be sure to select the proper temperature
compensation value if inches of water column are
selected. The temperature compensation value should
be the same for the Model 320 and the pressure
source.
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