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Chapter 5
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in
italic
text are guaranteed by design.
Analog input section
Table 1. Generic analog input specifications
Parameter
Conditions
Specification
A/D converters
Four dual 24-bit, Sigma-Delta type
Number of channels
8 differential
Input isolation
500 VDC minimum between field wiring and
USB interface
Channel configuration
Thermocouple sensor type
Differential input voltage
range
Thermocouple
±0.080 V
Absolute maximum input
voltage
±C0x through ±C7x relative to GND
(pins 9, 19, 28, 38)
±25 V power on, ±40 V power off.
Input impedance
5 Gigohm, min.
Input leakage current
Open thermocouple detect enabled
105 nA max.
Normal mode rejection ratio
f
IN
= 60 Hz
90 dB min.
Common mode rejection ratio
f
IN
= 50 Hz/60 Hz
100 dB min.
Resolution
24 bits
No missing codes
24 bits
Input coupling
DC
Warm-up time
30 minutes min.
Open thermocouple detect
Automatically enabled when the channel pair is
configured for thermocouple sensors.
The maximum open detection time is
3 seconds.
CJC sensor accuracy
15 °C to 35 °C
±0.25 °C typ.,
±0.5 °C max.
0 °C to 70 °C
-1.0 to +0.5 °C max
Channel configurations
Table 2. Channel configuration specifications
Sensor Category
Conditions
Specification
Thermocouple
J, K, S, R, B, E, T, or N
8 differential channels
Note 1:
Channel configuration information is stored in the EEPROM of the isolated microcontroller by
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
.
Summary of Contents for USB-5201
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