500-003111-000
4-22
4.8.2 Calibration
Self-Testing
On-board precision reference voltages permit calibration, verification,
and autocalibration of the ADC and the analog output channels during system
operation. Reference voltages on the VMIVME-3111 board are jumper-selected for
nominal ranges of as ±2.5 VDC, ±5 VDC, or ±10 VDC. The actual voltages are
adjusted to be approximately 0.49 percent below their nominal values in order to
produce full-range readings which are 10 (0A HEX) counts
below full-scale.
This is
done in order to minimize the occurrence of ambiguous "end-of-scale" readings.
Table 4.8.2-1. Calibration Test Limits
NOMINAL
SELF-TEST
STANDARD
(VDC)
REFERENCE
VOLTAGE
(VDC)
FULL-SCALE
RANGE
(VDC)
ACCEPTANCE RANGE (HEX)
±
0 LSB
(NOMINAL)
±
2 LSB
MAX MIN
±
4 LSB
MAX MIN
+10.0
+5.0
+2.5
ZERO
ZERO
-2.5
-5.0
-10.0
+9.9512
+4.9756
+2.4878
0.0000
0.0000
-2.4878
-4.9756
-9.9512
0 TO +10
±
10
0 TO +5
±
5
±
2.5
ALL BIPOLAR
RANGES
ALL UNIPOLAR
RANGES
±
2.5
±
5
±
10
0FEC
0FF6
0FEC
0FF6
0FEC
0800
0000
000A
000A
000A
0FEE
0FF8
0FEE
0FF8
0FEE
0802
0002
000C
000C
000C
0FEA
0FF4
0FEA
0FF4
0FEA
07FE
0000
0008
0008
0008
0FE8
0FF2
0FE8
0FF2
0FE8
07FC
0000
0006
0006
0006
0FF0
0FFA
0FF0
0FFA
0FF0
0804
0004
000E
000E
000E
All reference voltages are measured with converter PGA gain adjusted to unity (x1).
M3111/T4.8.2-1
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