Measurement Computing USB-7202 - Manual (Page 19)

19
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Parameter Conditions Specification
A/D converter type 16-bit successive approximation type
Number of channels 8 single-ended
Input configuration Individual A/D per channel
Sampling method Simultaneous
Absolute maximum input voltage CHx IN to GND ±15 V max
Input impedance 100 M
Ω min
Input ranges Software-selectable ±10 V, ±5 V, ±2 V, ±1 V
Sampling rate Scan to system memory 0.6 S/s to 50 kS/s, software-selectable
BURSTIO scan to 32 k sample FIFO 20 S/s to 50 kS/s, software-selectable
Throughput Software paced 500 S/s all channels, system-dependent
Scan to system memory (Note 1) (100 kS/s) / (# of channels); maximum of
50 kS/s for any channel
BURSTIO scan to 32 k Sample FIFO (200 kS/s) / (# of channels), maximum of
50 kS/s for any channel
Resolution 16 bits
No missing codes 15 bits
Crosstalk Signal DC–25 kHz –80 dB
Trigger source Software-selectable External digital: TRIG_IN
Calibration Cal factors stored in firmware. Cal factors
must be applied to data via application
software.
Note 1: Maximum throughput scanning to system memory is machine dependent.
Table 2. Calibrated absolute accuracy
Range Accuracy (mV)
±10 V 5.66
±5 V 2.98
±2 V 1.31
±1 V 0.68
Table 3. Accuracy components - All values are (±)
Range % of Reading Gain error at FS (mV) Offset (mV)
±10 V 0.04 4.00 1.66
±5 V 0.04 2.00 0.98
±2 V 0.04 0.80 0.51
±1 V 0.04 0.40 0.28