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.

Cold Junction Channel Numbers

Unit	Slot #		Required CJC Channels
Main Chassis	1	(bottom slot)	3, 6, 11, 14
	2		19, 22, 27, 30
	3		35, 38, 43, 46
	4		51, 54, 59, 62

Expansion Chassis (Option)	5		67, 70, 75, 78

	6		83, 86, 91, 94
	7		99, 102, 107, 110
	8	(top slot)	115, 118, 123, 126

CAUTION

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.

ChartScan User’s Manual

Calibration 6-17

1400 specifications

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Omega Vehicle Security 1400 manual Cold Junction Calibration, Option a Cold Cell Method

Models: 1400