Measurement Computing USB-2527 - Manual (Page 53)

53
Chapter 5
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
A/D converter type Successive approximation
Resolution 16 bits
Number of channels 16 single-ended/8 differential, software-selectable
Input ranges (SW programmable) Bipolar: ±10 V, ±5 V, ±2 V, ±1 V , ±0.5 V, ±0.2 V, ±0.1 V
Maximum sample rate 1 MHz
Nonlinearity (integral) ±2 LSB maximum
Nonlinearity (differential) ±1 LSB maximum
A/D pacing Onboard input scan clock, external source (XAPCR)
Trigger sources and modes See Table 8
Acquisition data buffer 1 MSample
Configuration memory Programmable I/O
Maximum usable input voltage
+ common mode voltage (CMV +
V
in
)
Range: ±10 V, ±5 V, ±2 V, ±1 V ,
±0.5 V 10.5 V maximum
Range: ±0.2 V, ±0.1 V 2.1 V maximum
Signal to noise and distortion 72 dB typical for ±10 V range, 1 kHz fundamental
Total harmonic distortion -80 dB typical for ±10 V range, 1 kHz fundamental
Calibration Auto-calibration, calibration factors for each range stored onboard in non-volatile
RAM.
CMRR @ 60 Hz -70 dB typical DC to 1 kHz
Bias current 40 pA typical (0 °C to 35°C)
Crosstalk -75 dB typical DC to 60Hz; -65 dB typical @ 10kHz
Input impedance 10 MΩ single-ended, 20 MΩ differential
Absolute maximum input voltage ±30 V
Accuracy
Table 2. Analog input accuracy specifications
Voltage range Accuracy
±(% of reading + %
range)
23°C ±10 °C, 1 year Temperature coefficient
±(ppm of reading + ppm range)/°C Noise (cts
RMS)
-10 V to 10 V
Note 1
0.031% + 0.008% 14 + 8 2.0
Note 2
-5 V to 5 V 0.031% + 0.009% 14 + 9 3.0
-2 V to 2 V 0.031% + 0.010% 14 +10 2.0
-1 V to 1 V 0.031% + 0.02% 14 + 12 3.5
-500 mV to 500 mV 0.031% + 0.04% 14 +18 5.5
-200 mV to 200 mV 0.036% + 0.075% 14 +12 8.0
-100 mV to 100 mV 0.042% + 0.15% 14 +18 14.0
Note 1: Specifications assume differential input single-channel scan, 1 MHz scan rate, unfiltered,
CMV=0.0 V, 30 minute warm-up, exclusive of noise, range is +FS to -FS.