Specifications; Analog Input Section - Measurement Computing USB-1608FS User Manual

Specifications

Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input section

Parameter
A/D converter type
Number of channels
Input configuration
Sampling method
Absolute maximum input voltage
Input impedance
Input ranges
Sampling rate
Throughput
Gain queue
Resolution
No missing codes
Crosstalk
CAL output
CAL output accuracy (Note 2)
CAL current
Trigger source
Maximum throughput scanning to PC memory is machine dependent. While the majority of XP
Note 1:
equipped PC's we tested allowed acquisition at the maximum rates, a few would not. The lowest
maximum rate we observed on an XP equipped PC during multi-channel testing was 95 kS/s,
aggregate. The rates specified are for Windows XP only. Maximum rates on operating systems
that predate XP may be less and must be determined through testing on your machine.
Actual values used for calibration are measured and stored in EEPROM.
Note 2:
Range
±10 V
±5 V
±2 V
±1 V
Table 1. Analog input specifications
Conditions
CHx IN to GND.
Software selectable
Scan to PC memory
Burst scan to 32 k sample FIFO
Software paced
Scan to PC memory (Note 1)
Burst scan to 32 k
sample FIFO
Signal DC-25 KHz
User calibration source
Software selectable
Table 2. Calibrated absolute accuracy
Accuracy (mV)
5.66
2.98
1.31
0.68
4-1
Chapter 4
Specification
16-bit successive Approximation type
8 single-ended
Individual A/D per channel
Simultaneous
±15 V max
100 MOhm, min
±10 V, ±5 V, ±2 V, ±1 V
0.6 S/s to 50 kS/s, software
programmable
20 S/s to 50 kS/s, software
programmable
500 S/s all channels
= (100 kS/s) / (# of channels), max of
50 kS/s for any channel
= (200 kS/s) / (# of channels), max of
50 kS/s for any channel
Software configurable. Eight elements,
one gain element per channel.
16 bits
15 bits
-80 dB
0.625 V, 1.25 V, 2.5 V, 5.0 V, software
selectable
±0.5% typ, ±1.0% max
±5 mA max
External digital: TRIG_IN