Edgetech PPM1, Operator'S Manual, Page: 20 / 29

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We have now made all the desired changes, and the display defaults to the
standard Hyperterminal window with periodic updates. See the illustration below.
5.4.5 CALIBRATING THE ANALOG OUTPUTS
If you have a precise
milliammeter, the PPM1 and
PPM2 allow you to check the
calibration of the two 4 to 20 mA
analog outputs. In order to utilize
this capability, connect the meter
in series with one of the analog
outputs and the load. Observe
the correct meter polarity.
Press the “Escape” key on your
keyboard, which will interrupt the
data stream and give you the
Calibration option. Than, press
“C” for C)alibrate. For this
example, select Output 1 to
calibrate. Next, read your
precision ammeter, which will give
you the high end current. It
should read around 20 mA. In
this case, the actual reading is
19.9 mA as shown. Type this
value in.