Measurement Computing Data Translation DT3034, User Manual

Page: 143 / 178

Appendix A
142
Analog Input Specifications
Table 23 lists the specifications for the A/D subsystem on the DT3034 board.
Table 23: A/D Subsystem Specifications
Feature DT3034 Specifications
Number of analog input channels
Single-ended/ pseudo-differential:
Differential:
32
16
Number of gains 4 (1, 2, 4, 8)
Resolution 16 bits
Data encoding
Bipolar:
Unipolar:
Offset binary
Binary
System accuracy
(full-scale)
Gain = 1:
Gain = 2:
Gain = 4:
Gain = 8:
0.01%
0.02%
0.02%
0.03%
Nonlinearity (integral) ±2.0 LSB
Differential linearity ±0.75 LSB (no missing codes)
Range
Bipolar:
Unipolar:
±10 V
0 to 10 V
Drift
Zero:
Gain:
±20

V + (+10

V * Gain)/

C
±25 ppm/

C
Input impedance
a
Off:
On (Differential):
On (Single-ended):
100 M

10 pF
100 M

100 pF
100 M

200 pF
Input bias current ±20 nA
Common mode voltage ±11 V maximum (operational)
Maximum input voltage ±20 V maximum (protection)
A/D converter noise 0.5 LSB rms
Amplifier input noise 15.0

V rms + (20

V rms * gain)
20.0 pA rms (current)
Channel-to-channel offset ±30.0

V
Channel acquisition time, typical 1

s to 0.01%
A/D conversion time 2.0

s