Set the Coarse Zero
control
to position 8
and
Coarse
Span control to
position 0.
Position the front panel switches to the desired settings for the application. Refer to Fig. 2
for details. Connect readout device (i.e. voltmeter) to ANO & A Common.
(b)
(c)
13
With the transducer unloaded, adjust the Coarse Zero and the Fine Zero control until the
desired analog output is achieved. If greater zero authority is desired, place the front panel
Switch 7 - "Zero Adj" to the extended range. This will allow the user to obtain 100% zero offset control.
The Normal postion of switch 7 allows for approx. 25% Zero authority.
(d)
calibration resistor can be approximated
mv/v sensitivity rating of the transducer
known.
as follows, assuming that
and the bridge resistance
the
are
13
Apply a known dead weight value which is greater than one half of full scale
in the positive direction or activate the "SHP" terminal (shunt positive) by connecting"SHP" to
"Power Common" as described in Fig. 3. Adjust Coarse Span to obtain your nominal full scale
analog output. Use Fine Span control to adjust the signal to the precise value required (or for an
analog value that correspondes with the appropriate Shunt Calibration value). Unload the
transducer and check "Zero" and adjust as necessary. Repeat Span load and verify values. If the
transducer is to be also used in the negative realm, load the transducer in the negative direction
with the the same dead weight value or activate the "SHN" (shunt negative) and adjust the
Symmetry control until you obtain the proper negative output reading.
(e)
Repeat step (e) as needed to obtain analog output precision. Note that any Span (gain)
adjustments will effect the Zero (balance) value.
the Coarse and Fine SPAN controls. If not, adjust the Symmetry control
to obtain the negative Equivalent Input value.
If dead weight calibration is not practical and the transducer calibration
data is unknown, the Equivalent Input value for the factory-installed
calibration resistor can be approximated
mv/v sensitivity rating of the transducer
known.
as follows, assuming that
and the bridge resistance
the
are
13
(f)
(m)
When completed, ensure connections and proper shielding are correct to the moduleand re-install the top conver
to the IL70A case.
Note:
When appling the SHUNT resistor value for calibration, the sensor should be in an "unloaded" condition.
3. CALIBRATION
Calibration IL70A.3
DC Strain Gage Conditoner
Module
IL70A
