Chapter 5 Specifications; Analog Input Section; Channel Configurations - Measurement Computing USB-5201 User Manual

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

Analog input section

Parameter
A/D converters
Number of channels
Input isolation
Channel configuration
Differential input voltage
range
Absolute maximum input
voltage
Input impedance
Input leakage current
Normal mode rejection ratio
Common mode rejection ratio
Resolution
No missing codes
Input coupling
Warm-up time
Open thermocouple detect
CJC sensor accuracy

Channel configurations

Sensor Category
Thermocouple
Channel configuration information is stored in the EEPROM of the isolated microcontroller by
Note 1:
the firmware whenever any item is modified. Modification is performed by commands issued
over USB from an external application, and the configuration is made non-volatile through the
use of the EEPROM.
Note 2: The factory default configuration is Type J.
Table 1. Generic analog input specifications
Conditions
Thermocouple
±C0x through ±C7x relative to GND
(pins 9, 19, 28, 38)
Open thermocouple detect enabled
f = 60 Hz
IN
f = 50 Hz/60 Hz
IN
15 °C to 35 °C
0 °C to 70 °C
Table 2. Channel configuration specifications
Conditions
J, K, S, R, B, E, T, or N
22
Specification
Four dual 24-bit, Sigma-Delta type
8 differential
500 VDC minimum between field wiring and
USB interface
Thermocouple sensor type
±0.080 V
±25 V power on, ±40 V power off.
5 Gigohm, min.
105 nA max.
90 dB min.
100 dB min.
24 bits
24 bits
DC
30 minutes min.
Automatically enabled when the channel pair is
configured for thermocouple sensors.
The maximum open detection time is
3 seconds.
±0.25 °C typ.,
±0.5 °C max.
-1.0 to +0.5 °C max
Specification
8 differential channels
Chapter 5