Model 574 Programmable Counting System (PCS)
80 - GSE Scale Systems
proceeding prompts to exit and save all changes.
The 574's calibration zero is now set to establish the
platform's gross zero at the current input signal from
your scale platform.
NOTE:
If the keyed in weight exceeds Full Scale by +4% or falls
below 0.1% of Full Scale, an error message will be
displayed. If you forgot to add the calibration weight
before pressing <ENTER>, the 574 will prompt you to
do so. In this case, place the calibration weight on the
scale and press <ENTER>.
If an overload exists or the previously set instrument gain
is too high, the indicator will display an overload
message. In this case, press <CLR> and the 574 will
reduce the current instrument gain and return you to step
2 so you can re-start the calibration.
The system will perform the calibration, display the
value of the calibration weight and prompt you by
displaying CAL OK? At this point, the accuracy of the
calibration can be checked by weight without leaving the
Calibration Mode.
If the calibration was accurate, press <ENTER>.
The system will prompt you to save the new calibration
plus any other changes that were made. Press <ENTER>
to save and then <ENTER> to exit.
If the calibration is not accurate, press <CLR>.
The system will return to the New Zero? prompt.
Proceed as described in step 3 of this section.
NOTE:
If the calibration weight was less than 5% of capacity or
if there was a large change in the calibration, the
indicator will prompt you with the message ReCal
Req'd. Press <ENTER> and you will be returned to
step 3 of this procedure, or press <CLR> to obtain the
CAL OK? prompt and override the re-calibration
requirement. However, we recommend you perform a
re-calibration in order to avoid any serious inaccuracy.
e) "Cal Reset"
The “Cal Reset” adjusts the zero and gain factors of the
amplifier on the A/D. The parameters being adjusted are
listed below.
P61104 Coarse Zero
P61105 Fine Zero
P61106 Coarse Gain
P61107 Fine Gain
When reset, these parameters are ajusted to the lowest
possible values. Refer to the chapter on Information
Parameters for a more detailed explanation on the gain
factors.
Normally a Cal Reset is performed if the amplifier is
locked in at extremely high gain factors and will not
allow a new calibration to be performed. If an over or
under load condition exists while in the Cal mode, press
<CLR> to perform a Cal Reset. This has the same effect
as pressing the <ENTER> key at the Cal Reset prompt.
After a Cal Reset is performed, the unit goes back to the
“New Zero?” prompt. The <SELECT> key will toggle
to the desired calibration routine.
After performing a Cal Reset, a re-calibration should be
performed before exiting the calibration or setup modes.
The reset will not be saved unless a re-cal is performed
and changes are saved.
7.2 Multi-Point Linearization
If the load cell signal input to the 574 has good
repeatability and stability, then using multi-point
linearization during calibration may significantly
improve the ultimate accuracy of the data displayed by
the 574. Setup Mode parameter P119 enables or disables
this feature. Initially, the same basic procedures as a
normal calibration are used to perform a multi-point
linearization. All of the prompts provided will be exactly
the same up to the CAL OK? prompt (steps 1-3a thru 3e
described in previous sections of this chapter)
At this point, the system will prompt you with Keyin Pnt
2 which will instruct you to key in the second calibration
point. Simply add the weight which you want to use for
the next calibration point, then key in the total applied
weight and press <ENTER>. You may wish to add
weight until the displayed weight differs from the actual
applied weight and then perform the next calibration at
NOTE:
A Calibration Reset is performed if the amplifier
is locked in at extremely high gain factors and will
not allow a new calibration to be performed.
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