參數(shù)資料
型號(hào)： PCADADIO-CS
英文描述： PC(ISA)BUS I/O CARD
中文描述： 電腦（ISA）總線(xiàn)的I / O卡
文件頁(yè)數(shù)： 15/26頁(yè)
文件大小： 393K
代理商： PCADADIO-CS
Page 15
2192-09061-000-000
J489 PCADADIO
Calibrating the DACs
In order to calibrate the DACs it is necessary to have a DVM with at least 5 digit resolution. On
the demonstration disk there is a facility useful for calibrating the DACs. This allows each DAC
to be set to the required value for calibration.
A single trim (VR2) is provided to trim the reference voltage used by the DACs. Additionally, two
trimmers are provided for adjusting the zero offset and gain of each DAC channel. VR5 and VR3
trim the zero offset and gain of DAC channel A and VR6 and VR4 DAC channel B respectively.
These trims are for fine adjust only within standard ranges.
Set the necessary links for the required mode and voltage ranges. Run the screen display
software. Put the DVM on the AGND and VREF test point and adjust VR2 to read 5.02V.
Unipolar Calibration
For DAC channel A.
Zero Offset Adjust
1)
Set DAC A output to 000 hex.
2)
Measure between the DAC A output on PL1 and analogue ground and adjust
VR5 to give 0.000V.
Full Scale Gain Adjust
1)
Set the DAC A output to 800 hex.
2)
Measure between the DAC A output on PL1 and adjust VR3 to exactly give half scale output
(2.500V for the 0V to 5V output and 5.000V for the 0V to 10V output).
3)
Set DAC A to FFF hex and check full scale is:-
9.9975 for 0V to 10V range.
4.9985 for the 0V to 5V range.
4)
Adjust VR3 if necessary.
Repeat for DAC channel B replacing VR5 with VR6, and VR3 with VR4.
Bipolar Calibration
For DAC channel A.
Zero Offset Adjust
1)
Set DAC A output to 000 hex.
2)
Measure between the DAC A output on PL1 and analogue ground and adjust VR5
to give full scale negative i.e. -5.000V.
Full Scale Gain Adjust
1)
Set the DAC A output to 800 hex.
2)
0.000V.
Measure between the DAC A output on PL1 and adjust VR3 to give half scale output
3)
Set DAC A to FFF hex and check full scale is 4.9975V.
Repeat for DAC channel B replacing VR5 and VR6, and VR3 and VR4.
Note: If the gain adjust trimmers (VR3 & 4) have insufficient range, adjust VR2 to read
5.01V and repeat the calibration procedure.
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