Real Time Devices AD1200 User Manual page 75

. Bipolar Range Adjustments: -10 to +10 Volts
To adjust the bipolar 20-volt range (-10 to +10 volts), change the jumper on P3 so that it is insalled across the
20V pins. Leave the P4 and Pll jumpers at +/-. Then, set the input voltage o +5.0000 volts and adjust TRI until the
output matches the data in the table below.
Data Value for Calibrating Bipolar 20 Volt Range (-10 to +10 volts)
TR1
lnput Voltage = +5.0000V
A/D Converted Data
0100 0000 0000
D/A Calibration (ADA1200)
The D/A converter requires no calibration for the Xl ranges (0 to +5 and +5 volts). The followingparagraph
describes the calibration procedure for the X2 multiplier ranges.
To calibrate foir X2(0 to +10 or +10 volts), set the DAC output voltage range to 0 to + 10 volts (iumpers on X2
and 5 on P9, AOUTI, orP10, AOUT2). Then, program the corresponding D/A converter (DACI or DAC2) with rhe
digital value 2048. The ideal DAC output for 2048 atX2 (0 to +10 volt range) is 5.0000 volts. Adjust TR5 for
AOUTI and TR6 for AOUTZ until 5.0000 volts is read at the output. Table 5-3 lists ttre ideal output volrages per bir
weight for unipolar ranges and Table 54 lists ttre ideal output voltages for bipolar ranges.
Table 5-3 - D/A Converter Unipotar Catibration Tabte
D/A Bit Weight
ldeal Output Voltage (in mlllivotts)
0 t o + 5 V
0 t o + 1 0 V
4095 (Max. Output)
4998.8
9997.6
2048
2500.0
5000.0
1024 12s0.0
2500.0
512
625.00
1250.0
256
312.50
625.00
'128
156.2s0 312.50
64
78.125
156.250
32
39.063
78.125
1 6
19.5313
39.063
I
9.7656 19.s313
4
4.8828
9.7656
2
2.4414
4.8828
1 1.2207
2.4414
0
0.0000
0.0000
5-6