Cold Junction Calibration - Omega Engineering OMB-NETSCAN 1500 User Manual

Cold Junction Calibration

Required Equipment
Equipment for CJC Calibration
Cold (ice) cell for calibration with thermocouples at 0°C
T/C wire and subminiature plug connectors (T-Type T/C wire is recommended)
U-Type copper shorting plugs
Thermocouples
Equipment for Verification of Calibrated Temperature
Option (a): Cold Cell Method
Cold (ice) cell
Volts DC Calibrator
Digital Voltmeter or Digital Multimeter
2-22 Twisted-pairs
Voltage-to-temperature reference tables
Thermocouples
T/C wire and subminiature plug connectors (T-Type T/C wire is recommended)
Option (b): Hot Cell Method
Hot Cell
Thermocouple
T/C wire and subminiature plug connector (T-Type T/C wire is recommended)
Option (c): T/C Calibrator/Simulator Method
Using a T/C Calibrator/Simulator is not recommended due to possible transient effects which can cause erroneous readings.
T/C Calibrator
Thermocouple
T/C wire and subminiature plug connector (T-Type T/C wire is recommended)
*
see required specifications on page 6-2
Note: See figures, Cold Junction Calibration, Equipment Setup and Verification of Calibrated Temperatures.
The cold junction calibration applies only to thermocouple cards (CSN14/TC/P). The figure on the next
page, Cold Junction Calibration, Equipment Setup represents the setup for a T/C card in slot #1. In this
example channels 3, 6, 11, and 14 must be used for the cold junction calibration. The following table
indicates channel numbers applicable to the T/C card in each of the eight possible card slots.
Unit
Main Chassis
Expansion Chassis (Option)
Use approved ESD precautions, including static-free work area and grounded wrist strap,
when handling circuit boards and electronic components. Failure to do so could cause
equipment damage due to electrostatic discharge.
Note: The Cold Cell Simulator in the following figure shows a special connection box attached to it. This
connection box, which can be easily made, is not part of the cold cell device.
NetScan User's Manual
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Cold Junction Channel Numbers
Slot #
1 (bottom slot)
2
3
4
5
6
7
8 (top slot)
Required CJC Channels
3, 6, 11, 14
19, 22, 27, 30
35, 38, 43, 46
51, 54, 59, 62
67, 70, 75, 78
83, 86, 91, 94
99, 102, 107, 110
115, 118, 123, 126
Calibration 6-17