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Planning for
Thermocouple
Measurements
34 Field Wiring
You can wire your thermocouples and your thermocouple reference
temperature sensor to any of the HP E1415's channels. When you execute
your scan list, you only have to make sure that the reference temperature
sensor is specified in the channel sequence before any of the associated
thermocouple channels.
External wiring and connections to the HP E1415 are made using the
Terminal Module (see Figure 2-3 on page 36).
Note
The isothermal reference temperature measurement made by an HP E1415
applies only to thermocouple measurements made by that instrument. In
systems with multiple HP E1415s, each instrument must make its own
reference measurements. The reference measurement made by one
HP E1415 can not be used to compensate thermocouple measurements
made by another HP E1415.
Note
To make good low-noise measurements you must use shielded wiring from
the device under test to the Terminal Module at the HP E1415. The shield
must be continuous through any wiring panels or isothermal reference
connector blocks and must be grounded at a single point to prevent ground
loops. See "Preferred Measurement Connections" later in this section and
"Wiring and Noise Reduction Methods" in Appendix E page 361.
Chapter 2
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