Reference Temperature Sensing With The Hp E1313 - HP E1313A Manual

Reference Temperature Sensing with the HP E1313

HP E1313 Module
On-Board Current Source
On-Board Current Source Return
HP E1313 Module
40 Field Wiring
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The HP E1313 can have two terminal modules installed. To obtain the
specified accuracy through each terminal module, the temperature of both
must be sensed. A sense channel is required on each terminal module which
leaves 31 channels on each terminal module for thermocouple and other
measurements. Figure 2-5 shows how the HP E1313 internally connects its
single current source to the two reference thermistors in series. Note that a
diode provides a current path when terminal module 2 is absent, but that
terminal module 1 must be in place and configured properly to provide a
current path to terminal module 2. Figure 2-7 shows sensing the on-board
thermistor. Refer to Figure 2-6 for remote thermistor connection.
Terminal Module 1 (Chs 0 - 31)
Any Sense Channel on Terminal Module 1
Terminal Module 2 (Chs 32 - 63)
Any Sense Channel on Terminal Module 2
Figure 2-5. HP E1313 Reference Temperature Circuit
REM LCL
JM1
REM LCL
JM1
Field Wiring
HTI
LTI
HTS
LTS
Hnn
Lnn
Field Wiring
HTI
LTI
HTS
LTS
Hnn
Lnn
Chapter 2