ADLINK PCM-9112+ - Manual (Page 85)

Calibration • 77
6.3.2 Unipolar Calibration (Gain = 1, i.e. input range = 0~+10V)
1. Set the A/D input range to bipolar 5V.
2. Adjust the voltage calibrator’s voltage output to –4.9987V (i.e. –V
full
scale
+ 1/2 LSB). Apply this signal to A/D channel 0.
3. Trim VR1 to obtain a reading which toggles between 0 and 1.
4. Set A/D input range to unipolar 10V (i.e. gain = 1, 0 to +10V range).
5. Adjust the voltage calibrator’s voltage output to +1.22mV (-V
full scale
+
1/2 LSB, i.e. 0V+1.22mV). Apply this signal to A/D channel 0.
6. Trim VR5 to obtain a reading which toggles between 0 and 1.
7. Adjust the voltage calibrator’s voltage output to +9.9963V (+V
full scale
--
3/2 LSB, i.e. 10V - 3.66mV). Apply this signal to A/D channel 0.Trim
VR2 to obtain a reading which toggles between 4094 and 4095.