Rice Lake SURVIVOR 420HE Hostile Environment - Installation Manual - Manual (Page 32)

28 420HE Installation Manual
3. Place test weights on the scale and use the
WVAL command to enter the test weight value
in the following format:
WVAL=nnnnnn<CR>
4. Send the WSPAN EDP command to calibrate
span. The indicator displays *CAL* while
calibration is in progress.
5. To remove an offset value, clear all weight
from the scale, including hooks or chains used
to hang test weights, then send the REZERO
EDP command. The indicator displays
*CAL*
while the zero and span calibrations are
adjusted.
6. Send the KUPARROW EDP command to exit
setup mode.
4.3 Revolution® Calibration
To calibrate the indicator using Revolution , the
indicator EDP port must be connected to a PC running
the
Revolution configuration utility.
Use the following procedure to calibrate the indicator:
1. Select Calibration Wizard from the Revolution
tools menu.
2. Revolution uploads calibration data from the
indicator then presents the information in a
display like that shown in Figure 4-2.
Figure 4-2. Revolution Calibration Display
3. Enter the Value of Test Weight to be used for span
calibration then click OK .
4. The Zero Calibration dialog box prompts you
to remove all weight from the scale. Clear the
scale and click
OK to begin zero calibration.
Note
If your test weights require hooks or
chains, place the hooks or chains on the scale
for zero calibration.
5. When zero calibration is complete, the Span
Calibration dialog box prompts you to place
test weights on the scale for span calibration.
Place tests weights on the scale then click
OK .
6. When calibration is complete, the New Settings
fields of the Indicator Calibration display are
filled in. Click
Exit to save the new values and
return to the Revolution main menu; to restore
the previous calibration values, click Restore
Settings .
4.4 More About Calibration
The following topics provide additional information
about compensating for environmental factors
(Section 4.4.1) and diagnostic information for
determining expected zero and span coefficients.
4.4.1 Adjusting Final Calibration
Calibration may be affected by environmental factors
including wind, vibration, and angular loading. For
example, if the scale is calibrated with 1000 lb, a strain
test may determine that at 2000 lb the calibration is 3 lb
high. In this case, final calibration can be adjusted by
tweaking WVAL to 998.5 lb. This adjustment provides
a linear correction of 1.5 lb per 1000 lb.
To adjust the final calibration, return to the WVAL
prompt and press to show the test weight value.
Press or to adjust calibration up or down. Press
to save the value, then press to return to the CALIBR
menu.
4.4.2 A/D Counts
Table 4-1 lists the ideal A/D counts that result from
input signals of 0–3.0 mV with zero deadload. Actual
values will typically be higher than the values shown in
Table 4-1 but the ideal values can be used when
calibrating the indicator with no attached scale.
Table 4-1. Ideal A/D Raw Counts
Input Signal (mV) Raw A/D Counts
0.0 mV/V 167,840
0.5 mV/V 335,613
1.0 mV/V 503,377
1.5 mV/V 671,143
2.0 mV/V 838,908
2.5 mV/V 1,100,668
3.0 mV/V 1,174,446
Note
When Raw A/D Count is displayed, the six
most significant digits appear. Scroll left or
right to see the full value.