SECTION 1 - TECHNICAL SPECIFICATION
Page 1.1
pickering
ISOLATED MILLIVOLT THERMOCOUPLE SIMULATOR 41-761
SECTION 1 - TECHNICAL SPECIFICATION
pickeringtest.com
PXI Isolated Millivolt Thermocouple Simulator 41-761
ISSUE E NOV 2019
PRELIMINARY DATA
• 32, 24, 16 or 8 Channel Low Voltage Source
• Ideal For Thermocouple Simulation
• +/-100mV, +/-50mV and +/-20mV Output Ranges
• 0.7µV Voltage Resolution (+/-20mV Range)
• Two-Wire Output for Each Channel
• Independently Isolated Channels
• Open Circuit Simulation
• Supported in PXI or LXI Chassis
• Kernel and VISA Drivers
• 3 Year Warranty
78-Pin D-Type Front Panel Connector
VOLTAGE
GENERATOR
1
Vo1 Vcold1
Channel 2 Channel 32Channel 1
VOLTAGE
GENERATOR
2
Vo2 Vcold2
VOLTAGE
GENERATOR
32
Vo32 Vcold32
Functional Diagram for the 41-761-001 Isolated Millivolt Thermocouple Simulator Module
The 41-761 is a low voltage output module ideal for simulating the
operation of a thermocouple, available with a choice of 32, 24, 16
or 8 channels. Each channel of the 41-761 provides a low voltage
output across two connector pins capable of providing ±20mV with
0.7µV resolution, ±50mV with 1.7µV resolution and ±100mV with
3.3µV resolution, covering most thermocouple types.
The use of two wire outputs and isolation from ground ensures that
the 41-761 can be used to accurately simulate low voltages even in
the presence of common mode voltages in the system. Each Vcold
connection is independent permitting the 41-761 to be connected
to multiple cold junctions.
Each simulation channel is able to provide an open circuit setting
to simulate faulty wiring connections to a sensor.
For improved accuracy each channel of the Low Voltage Output
carries accurate calibration data stored in EEPROM on the
module. Regular calibration of the channels is not necessary.
When used for Thermocouple Simulation the 41-761 can be
connected straight into the measurement system, bypassing the
need for Isothermal Blocks and Cold Junction Compensation. To
aid in this, Pickering offers a 78-pin connector solution that has
32, 24, 16 or 8 copper twisted pairs terminated with mini copper
thermocouple plugs. Use of copper connections minimizes offset
voltage generation in the connection interface.
Alternatively Pickering can also supply connector blocks that
convert the copper connections of the module’s 78-pin connector to
that of the required thermocouple type.
