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© National Instruments Corporation A-1 Lab-PC+ User Manual
Appendix A
Specifications
This appendix lists the specifications of the Lab-PC+. These specifications are typical at 25°C
unless otherwise stated. The operating temperature range is 0° to 70°C.
Analog Input
Input Characteristics
Number of channels ...................................... 8 single-ended, 4 differential
Type of ADC................................................. Successive approximation
Resolution ..................................................... 12 bits, 1 in 4,096
Maximum sampling rate ............................... 83 ksamples/s
Input signal ranges ........................................
Board Gain
(Software
Board Range
(Jumper Selectable)
Selectable) bipolar unipolar
1 ±5 V 0 to 10 V
2 ±2.5 V 0 to 5 V
5 ±1 V 0 to 2 V
10 ±0.5 V 0 to 1 V
20 ±0.25 V 0 to 0.5 V
50 ±0.1 V 0 to 0.2 V
100 ±0.05 V 0 to 0.1 V
Input coupling ............................................... DC
Overvoltage protection.................................. ±45 V powered on, ±45 V powered off
Inputs protected....................................... ACH<0..7>
FIFO buffer size ............................................ 512 samples
Data transfers ................................................ DMA, interrupts, programmed I/O
DMA modes .................................................. Single transfer
Transfer Characteristics
Relative accuracy .......................................... ±1.0 LSB typ, ±1.5 LSB max
DNL .............................................................. ±0.5 LSB typ, ±1 LSB max
No missing codes .......................................... 12 bits, guaranteed
Offset error
Pregain error after calibration ................. Adjustable to 0 V
Postgain error after calibration................ Adjustable to 0 V
Gain error (relative to calibration reference)
After calibration ...................................... Adjustable to 0%
Before calibration.................................... ±0.76% of reading (7,600 ppm) max
Gain ≠ 1 with gain error
adjusted to 0 at gain = 1 ........................ ±0.5% of reading (500 ppm) max