Measurement Computing USB-1602HS-2AO - Manual (Page 38)

38
Chapter 5
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
All signal names refer to 68 pin SCSI connector, unless otherwise specified.
Analog input
Table 1. Analog input specifications
Parameter Conditions Specification
A/D converter type 16-bit successive approximation type
Number of AI channels 2 SE simultaneous
Input configuration Single-ended
Sampling method Simultaneous; individual A/D per channel
Input ranges ±10 V, ±2.5 V, ±500 mV
Absolute maximum input
voltage ±30 V maximum (power on)
±20 V maximum (power off)
Input impedance 10 MΩ (typical, power on)
Input bias current < 2 µA
Input bandwidth (-3 dB) 3 MHz, typical
Crosstalk Remaining inputs grounded 100 dB (at 100 kHz )
Pacer sources
 Onboard A/D clock or external digital source
(XAPCR or EXT CLK BNC)
 External pacing (XAPCR or EXT CLK BNC)
See Table 12 for additional information.
Trigger sources and modes See Table 11
Sampling rate 0.01 S/s to 2 MS/s each channel, software
programmable
Clock sources Internal, software programmable or external pacing
Resolution 16-bits
INL (integral non-linearity) ±2.0 LSB
DNL (differential non-linearity) ±1.0 LSB
Table 2. Calibrated accuracy
Range Accuracy
±10 V ±1 mV
±2.5 V ±0.5 mV
±500 mV ±0.15 mV
Table 3. Noise performance, note 1
Range Typical counts LSB rms
±10 V 8 1.3
±2.5 V 11 1.6
±500 mV 17 2.5
Note 1: Noise distribution is determined by gathering 50,000 samples with inputs tied to ground at the
BNC connectors. Samples are gathered at the maximum specified rate.