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GFS2102™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company Page 174
The LCM default front panel display shows the output of the ambient temperature
PRT in its lower right corner on power up (see Figure 110).
A one point verification against an ambient temperature reference is all that is
needed.
If a full adjustment is desired, at least two points should be selected within the range
of the sensor and encompass the range of measurements the sensor may
encounter during normal operation.
To adjust the value of Rzero use GFS Tools and select the [Setup] ,
[Calibration] , <Ambient> tab (see Figure 4) to access a screen in which the
Rzero value can be edited. Normally, only Rzero is adjusted. Calculate a new
Rzero using the following formula:
Rzero(new) = Rzero(current) + ((Tdisplay – Tref)*0.3896)
Where:
Rzero(new) is the new resistance at 0°C in ohms.
Rzero(current) is the current resistance at 0°C in ohms from the <Ambient>
tab.
Tdisplay is the observed temperature in °C from the LCM display.
Tref is the reference temperature reading in °C.
From here, press OK and wait while the coefficients are uploaded to the LCM.
When the upload is complete, cycle the power on the LCM, and the LCM
reading should reflect the newly applied calibration coefficients.
See Section 1.1 for ambient temperature sensor specifications.
7.5.4.4 RELATIVE HUMIDITY SENSOR
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PURPOSE
To view and adjust the output of the ambient relative humidity sensor.
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OPERATION
The LCM default front panel display shows the output of the ambient relative
humidity sensor in its upper right corner on powerup (see Figure 110).
A one point verification against an ambient humidity reference is all that is
needed.
If a full adjustment is desired, at least two points should be selected within the
range of the sensor and encompass the range of measurements the sensor may
encounter during normal operation.
To adjust the values of the Adder and/or Multiplier use GFS Tools and select the
[Setup], [Calibration], <Ambient> tab (see Figure 111) to access a screen in
which the values of the Adder and Multiplier can be edited. Normally, only the
Adder is adjusted. From here, press OK and wait while the coefficients are
uploaded to the LCM. When the upload is complete, cycle the power on the
LCM, and the LCM enclosure sensor reading should reflect the newly applied
calibration coefficients.
See Section 7.5.4 for an explanation of Adders and Multipliers and their use in
adjusting internal sensors.