Data Translation DT9800 Series, User Manual

Page: 118 / 162

Chapter 5
106
Using the Manual Calibration Procedure
To calibrate the analog input subsystem manually, perform the
following steps:
1. Click A/D Ch. 1 .
2. Click the increment or decrement arrows in the Offset box until
the A/D value on the screen reads 0 V (within 0.001 V for the
DT9803, DT9803-EC, DT9803-EC-I, DT9804, DT9804-EC,
DT9804-EC-I, DT9805, and DT9806 modules and within 0.010 V
for the DT9801, DT9801-EC, DT9801-EC, DT9802, DT9802-EC,
and DT9802-EC-I modules).
3. Click A/D Ch. 0 .
4. Click the increment or decrement arrows in the Gain box until
the A/D value on the screen reads +9.3750 V (within 0.001 V for
the DT9803, DT9803-EC, DT9803-EC-I, DT9804, DT9804-EC,
DT9804-EC-I, DT9805, and DT9806 modules and within 0.010 V
for the DT9801, DT9801-EC, DT9801-EC-I, DT9802, DT9802-EC,
and DT9802-EC-I modules).
Note: If you are not satisfied with the analog input calibration, you
can load the factory default settings stored in the EEPROM by
clicking
Restore in the A/D Configuration Factory Settings box.
Once you have finished this procedure, the analog input circuitry is
calibrated. If you are using a DT9805 or DT9806 function module, it is
recommended that you calibrate the thermocouple circuitry using the
instructions in the next section. Otherwise, you can calibrate the
analog output circuitry, if you wish, following the instructions on
page 109 .