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100/180 MM GRAPHICS RECORDER: USER GUIDE
User Guide
Page 65
HA261742
Issue 16 Nov 04
Break Response
Cold Junction Type
Remote CJ Temp from
Descriptor
None
Remote
Channel 3
˚C
F u r n a c e 1 T e m p
Break Response
Cold Junction Type
External CJ Temp
Descriptor
None
External
0
F u r n a c e 1 T e m p
Input
95%
3 x
Damping
Recorder
response
Effect of damping on step
change in input signal
Figure 4.3.3c Channel filter
4.3.3 CHANNEL/ALARM CONFIGURATION (Cont.)
FILTER
For 'noisy' slowly changing signals, damping can be used to filter noise so
that the underlying trend can be seen more clearly. None, 2, 4, 8, 16, 32,
64, 128 or 256 seconds can be selected.
It is not recommended that damping be used on quickly changing signals.
BREAK RESPONSE
For thermocouples and other low level inputs (i.e. input voltages less than 150mV), the recorder can be made to re-
spond in one of the following ways, if a break in the input circuit is detected.
None
trace drifts with the input wiring acting as an aerial.
Drive hi
trace placed at full scale
Drive lo
trace placed at scale 'zero'
COLD JUNCTION COMPENSATION (CJC)
For input type = thermocouple, None, Internal, External or Remote can be selected for cold junction compensation.
INTERNAL
Internal CJC is by means of an RTD connected across pins 11 and 12 of the input board connector.
EXTERNAL
If the cold junction is maintained (by the user) at a known, fixed tempera-
ture, 'external' should be selected. An extra numeric entry box appears to
allow the user to enter the temperature at which the cold junction is main-
tained.
REMOTE
'Remote' is selected if the cold junction temperature is to be
measured by an external device connected to the instrument.
An extra picklist appears which allows the user to select any
input or maths channel to act as the cold junction temperature
source channel. The temperature units displayed here, are those of the channel being configured, not those of the CJ
source channel. The CJ source channel must be configured appropriately for the external device, and must provide a
value which is consistent with the configured channel's units.
DESCRIPTOR
Allows a text string of up to 20 characters (including spaces) to be entered for the channel descriptor. (E.G. 'Turbine 2
tempA').
A/B SWITCHING
If enabled, this function allows alternative Span, Zone and Trace Colour values to be entered. 'A' values are used
during normal operation. 'B' values are switched to by job action, as described in