Isolation And Protection Specifications - Data Translation DT9871 User Manual

Isolation and Protection Specifications

Table 17 lists the isolation and protection specifications for the analog input subsystem on the
DT9871, DT9871U, DT9872, DT9873, and DT9874 instruments.
DT9871U, DT9871, and DT9874 Thermocouple Channels Overvoltage
Protection (Power On/Off)
Pin 2 referenced to pin 3:
Pin 2 and 3 referenced to earth ground:
DT9872 and DT9874 RTD Channels Overvoltage Protection (Power
On/Off)
Pin 1 referenced to pin 4:
Pin 2 referenced to pin 4:
Pin 3 referenced to pin 4:
Pin 1, 2, or 3 referenced to earth ground:
DT9873 and DT9874 Voltage Input Channels Overvoltage Protection
(Power On/Off)
Pin 1 referenced to pin 3:
Pins 1 and 3 referenced to earth ground:
ESD protection per standard EN61000-4-2:2009 (see
Arc:
Contact:
Isolation voltage to the host computer
Channel-to-channel isolation
a. These pins are functionally isolated for a maximum of 30 VAC, 60 VDC Ch-Earth, verified by a 500 Vpk withstand.
b. Determined by internal protection diodes to the power supply. No damage occurs if current is limited to ±10 mA.
Table 17: Isolation and Protection Specifications
Feature
±40 V
30 VAC, 42.4 Vpk, 60 VDC max.
±4 V
±40 V
±20 V
30 VAC, 42.4 Vpk, 60 VDC max.
±30 VAC, 42.4 Vpk, 60 VDC max.
30 VAC, 42.4 Vpk, 60 VDC max.
page 125 for more)
8 kV
4 kV
30 VAC, 42.4 Vpk, 60 VDC max.
30 VAC, 42.4 Vpk, 60 VDC max.
Specifications
b
Specifications
a
a
a
a
a
a
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