Electronics 500-P - Manual (Page 8)

IM0053A Page 8 of 10
SET ACTUAL CATCH
180
300
420
540
660
780
900
1020
1140
1200
7.4.3.2 Select either + or - Compensation
7.4.3.2.1 If the catch amounts are less than expected, you will need to select positive
(+) polarity compensation.
7.4.3.2.2 If the catch test amounts are more than expected then you must select
negative (-) polarity compensation. Only one polarity can be chosen for entire range.
7.4.3.3 Install Compensation Values
The compensation values can now be installed into the Pre-Amp. This is
accomplished by using the Pre-Amp selector switch and the nine (9) linearity
compensator trimpots. Each trimpot has a corresponding red LED. Only one trimpot
will be active at a time, as indicated by its LED.
7.4.3.3.1 Rotate the Pre-Amp selector switch to position three. The 15% LED should be
lighted. Adjust the 15% trimpot until the value in the Pre-Amp display corresponds to
the catch value.
7.4.3.3.2 Continue this procedure for the remaining values through 95% and then return
the Pre-Amp selector switch to the RUN position.
CAUTION: During this time various output signals will go from the Pre-Amp to the
shot flow controller input. The auto-zero feature of the controller will attempt to "zero"
these values. This is not a concern at the present time. Before running additional
catch and weigh trials always be sure that the shot flow controller display is resting at
ZERO.