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100mm GRAPHICS RECORDER TECHNICAL MANUAL
HA249875
Issue 1 Jan 99
Section 2
Page 2 - 9
2.3.2 Internal cold junction compensation (CJC) checking
These checks are carried out by placing the relevant type of calibrated thermocouple in a temperature reference (e.g.
triple-point device), and connecting it to an input channel using thermocouple or temperature compensated cable.
The channel is configured as follows:
Input type
= Thermocouple
Linearisation = type of thermocouple being used
CJC
= Internal
Range and scale: appropriate to the temperature reference.
The displayed value for the channel to which the thermocouple is connected is then checked (after a suitable time
period) to ensure that the channel reading is equal to the reference temperature to within 1.3˚
±
thermocouple accu-
racy.
2.3.3 Resistance inputs
The accuracy quoted against the equipment below is necessary to demonstrate that the recorder is performing to speci-
fication. If appropriate, this accuracy may be relaxed according to customer requirements.
EQUIPMENT REQUIRED
1. Resistance box 0 to 10 k
Ω
(Absolute accuracy: 5 m
Ω
)
Notes:
1. Calibration checks must be carried out with the recorder located in an area in which the ambient
temperature is maintained at 20
±
1 ˚C. The checks must be carried out only after the recorder has
been switched on for a minimum of 1 hour with the rear terminal cover fitted and with the door
closed.
2. Ensure that all leads to the resistance box are of the same length, gauge and material.
CALIBRATION CHECK
1
It is recommended that to save time, all the channels to be checked are connected to a terminal block as indicated
in figure 2.3.3. For low resistance values, the resistance of the wiring from resistance box to input termination
may have an effect. Ensure that a suitable gauge of wire is used. Ensure that the terminal cover is in place after
wiring.
2.
If required, configure a group to contain all the relevant channels
3.
For the first channel to be checked, use the channel configuration pages to set the input type to ‘Ohms’, linearisa-
tion to ‘Linear’ and the scale and range to the first of the input ranges in table 2.3.3 below. Repeat this configura-
tion with other relevant channels.
4.
Connect the resistance box to the first channel to be checked, using the terminal block. Set the resistance value
to the first checkpoint value in table 2.3.4, and after a suitable time period (see note above), check that the chan-
nel’s value is equal to the applied resistance within the specified tolerance.
5. Set the resistance box to each of the remaining checkpoints in turn * and check that the channel values are correct.
6. Repeat steps 4 and 5 for the remaining hardware ranges.
7. Repeat steps 4 to 6 for the remaining channels.
8. Restore any input wiring and restore configuration for the relevant channels.
* Note: The above process is time consuming and it is suggested that, unless a fault is suspected, only
checkpoints 2, 6 and 10 are checked for each range.
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Содержание 4100G
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