Section 3 – OPERATION
3.5 INITIAL OBSERVATION
NOTE:
For Series 43 Models 43-04F and 43-02C,
allow a 15-minute warm-up time before proceeding
with any observation or adjustment.
With all initial adjustments complete, you are ready
to apply power to the MODLINE 4 and any related
equipment. As heated object moves into the field
of view, the MODLINE 4 will respond to temperatures
within its temperature range. If you have the IRCON
Model AI-4 Analog Indicator or equivalent, the
pointer will move upscale as the lower inscribed
temperature is reached. If you have a digital readout
such as the IRCON Model IDP-4 Digital Indicator, the
temperature will be displayed on the readout.
If you are using a recorder with a fast response
time, you may note that it is not plotting a straight
line. This doesn’t necessarily mean the instrument
is faulty. You may be reading surface temperature
variations especially if the target material is moving.
3.6 RESPONSE TIME ADJUSTMENT
The temperature signal outputs have a full scale
step response time from 0.15 sec to 10 sec as
adjusted by the Response Time control on the panel
of the MODLINE 4.
Fig. 3.2 illustrates the effect of response time as it
might be displayed by a strip chart recorder. Notice
that longer response times tend to average out
signal fluctuations and produce more constant
signal outputs. On an analog or digital indicator,
this would give a more stable pointer action or less
digital “bounce.”
As you observe the temperature readings on your
indicator, adjust the Response Time control to
provide the most useful temperature information
without any distracting “jitter.” For instruments
with Peak Pickers, insert a small screwdriver in
the slot on the potentiometer and turn to the
desired setting.
3-4
®
FIG. 3.2 – EFFECT OF RESPONSE
TIME ON TEMPERATURE
SIGNAL
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