API Commands

Appendix A

 

 

J- Calibrate Cold Junction Offset

TYPE

Calibration

 

EXECUTION

Immediate

 

SYNTAX

Jchan,

Calibrate the cold-junction offsets for cold-junction compensation of the

 

type,

thermocouple signals where chan is the channel number such that

 

temp

1 < chan < max, where max = 128 for ChartScan/1400.

 

 

type is the thermocouple channel type.

 

 

temp is the reference temperature currently being applied to the selected

 

 

channel, with the form nnn.n in degrees º C.

DESCRIPTION

 

 

Note: This command is only for advanced users who perform their own calibration. It is not necessary for normal, everyday operation.

Active only in calibration mode, the Calibrate Cold Junction Offset (J) command is used to calibrate the cold junction offsets for cold-junction compensation of the thermocouple signals. Each thermocouple input channel has associated with it one of these temperature sensors. Although calibrated at the factory, these temperature sensors are subject to component aging which may affect their accuracy over time. The function of the Calibrate Cold Junction Offset (J) command is to allow the adjusting of the internal firmware to compensate for the affects of component aging.

Since there are 4 cold junction temperature sensors associated with 32 temperature input channels, it is necessary to select 4 channels. Each channel is associated with one of the 4 cold junction temperature sensors in order to calibrate all cold junction temperature sensors on a given card.

Note: Four separate channels on each card must be supplied with an accurate thermocouple signal of known warm junction temperature.

The parameter type is the same channel type that is used with the Configure Channels (C) command.

After the command has been issued, the applied thermocouple signal must remain at its value until the trigger LED stops flashing in order to achieve accurate results. For further details on channel calibration, see Chapter 6.

EXAMPLE

PRINT#1, “OUTPUT07;K12345X”

‘ Enter Calibration Mode

 

‘ Apply precision temperature

PRINT#1, “OUTPUT07;J1,2,101.7X”

‘ Compute cold junction offset for the temperature

 

sensor associated with the type K thermocouple

 

on channel 1 of card #1, at 101.7°C

 

‘ Wait for command to complete

 

‘ Remove precision temperature

PRINT#1, “OUTPUT07;EX”

‘ End calibration mode

A-38

ChartScan User’s Manual

Page 163 Page 165
Page 164
Image 164
Omega Vehicle Security 1400 manual Calibrate Cold Junction Offset, Temp, PRINT#1, OUTPUT07J1,2,101.7X
Page 163 Page 165

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