Specifications; Analog Input - Measurement Computing USB-2416 User Manual

Specifications

All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
All specifications apply to all temperature and voltage input channels unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input

Parameter
A/D converter type
A/D data rates
Throughput
Number of channels
Input isolation
Channel
configurations
Input voltage range
Absolute maximum
input voltage
Input impedance
Input leakage current
Input capacitance
Maximum working
voltage (signal +
common mode)
Common mode
rejection ratio (Note 1)
ADC resolution
Crosstalk
Input coupling
Channel gain queue
Warm-up time
Open thermocouple
detect
Table 1. General analog input specifications
Conditions Specification
ADS1256, 24-bit Sigma Delta
3750 samples per second (S/s), 2000 S/s, 1000 S/s, 500 S/s, 100 S/s,
60 S/s, 50 S/s, 25 S/s, 10 S/s, 5 S/s, 2.5 S/s
Single channel: 2.5 Hz to 1102.94 Hz, software selectable
Multiple channels: 0.16 Hz to 1102.94 Hz, software selectable
(see "Throughput rate" on page 35 for details)
Up to 32 channels individually software-configurable as single-
ended or differential
Thermocouples require differential mode. For each channel
configured as differential, you essentially lose one single-ended
channel. You can add channels by connecting to an AI-EXP32.
500 VDC min between field wiring and USB interface
Temperature sensor input, software programmable to match sensor
type
Voltage input
Thermocouple mode ±0.078125 V
Voltage mode (Note 1) ±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.3125 V,
±0.15625 V, ±0.078125 V, software- configurable
CxH-CxL relative to ±30 V max (power on)
GND
±10 V max (power off)
2 GΩ (power on)
390Ω (power off)
±10.6 nA
590 pf
Voltage mode: ±20V ±20.01 V max
range
Voltage mode: all other ±10.25 V max
voltage input ranges
Thermocouple mode, 110 dB
(f = 60 Hz)
IN
Voltage mode,(f = 90 dB
IN
60 Hz, all input ranges)
24 bits
Adjacent channels 100 dB
DC
Up to 64 elements Software configurable channel and range
45 minutes min
Automatically enabled when the channel is configured for a
thermocouple sensor.
21
Chapter 4