GFS2102™ OPERATION AND MAINTENANCE MANUAL
© 2007 DH Instruments, a Fluke Company
Page 138
5.5.7
[CALIBRATION]
5.5.7.1
[TIME/MASS]
Figure 91.
Calibration
[Time/Mass]
Tab
Table 60.
Calibration Editor
[Time/Mass]
Tab Fields
FEATURE
DESCRIPTION
Reference Mass (g)
(Required numeric entry field)
The calibrated true mass value of the Reference Mass in grams.
Reference Mass density
(Required numeric entry field)
The Reference Mass material density used in the calibration to determine the bouyancy
corrected true mass value.
Mass span multiplier
(Required numeric entry field)
The mass balance span correction multiplier to correct for a variation in the slope of the
balance readings. Although this number can be manually calculated and entered, it is
recommended to run the Balance Zero and Span function in Section 7.8.2 to automatically
calculate and apply the multiplier.
This multiplier has a default value of 1 for no correction.
If the internal balance calibration is run this number must be reset back to 1 or the Balance
Zero and Span function must be rerun or errors in the mass reading will occur, degrading
the overall accuracy of the GFS system.
PC clock time span
multiplier
(Required numeric entry field)
The PC clock time span correction multiplier to correct for the variation of time of the
System Controller (PC) from the calibrated LCM time. Although this number can be
manually calculated and entered, it is recommended to run the PC Timer Calibration
function in Section 7.2 to automatically calculate and apply the multiplier.
This multiplier has a default value of 1 for no correction.
LCM timer pre-scale
coefficient
(Required numeric entry field)
The pre-scale coefficient used by the LCM to adjust the internal 15.359 MHz crystal
frequency to calibrate the 1000 Hz counter used for GFS time functions.
The default value of this coefficient is 15359.
In the unlikely event that this value ever needs adjustment, adjustments greater than one
count should be regarded with skepticism. See Section 7.5.3.3 for instruction on adjusting
this value.