Tracer AV Installation Manual - Calibration
25
4.4
Revolution
®
Calibration
To calibrate the
Tracer AV
using
Revolution
, the EDP
p o r t m u s t b e c o n n e c t e d t o a P C r u n n i n g t h e
Revolution
configuration utility.
Use the following procedure to calibrate the
Tracer
AV
:
1. Select
Calibration Wizard
from the
Revolution
tools menu.
2.
Revolution
uploads calibration data from the
Tracer AV
then presents the information in a
display like that shown in Figure 4-3.
Figure 4-3.
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 other items,
place them 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
.
4.5
More About Calibration
The following topics provide additional information
about compensating for environmental factors
(Section 4.5.1) and diagnostic information for
determining expected zero and span coefficients.
4.5.1
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
s t r a i n t e s t m a y d e t e r m i n e t h a t a t 2 0 0 0 l b t h e
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 Zero to show the test weight
value. Press
Units
to adjust calibration up or down.
Press Zero to save the value, then press
Units
to
return to the CALIBR menu.
4.5.2
A/D Counts
Table 4-3 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 4-3, but the ideal values can be used when
calibrating the
Tracer AV
with no attached scale.
NOTE:
When Raw A/D Count is displayed, the six most
significant digits appear. Scroll left or right to see the full
value.
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
Table 4-3. Ideal A/D Raw Counts