DAD 141.1 Technical Manual, Rev. 2.5 – April 2015
Page 27 of 54
f
Go to Menu 2.3. by using the
UP/DOWN
and
ZERO
keys. The display shows 00.000mV/V. The load cells
signal @ 3000kg is e.g. 2.0123mV/V ((signal #1 + signal #2 + signal #3) / 3). By using the
UP/DOWN
and
TARE
keys you have to setup each number of the 6 digit display to 02.0123. Press the
ZERO
key to set the
display to read 3000.0kg. The electronic span calibration is done.
Leave this menu point with
ZERO
key.
The mV/V setting conform to our example with 1500kg live range means, we would have to setup only
01.0062
– which is 50% of mV/V @ 3000kg.
g
The last point for this example are the settings of over/under range.
Go to chapter 7.4 menu 3.1 (over/under range) by using the
UP/DOWN
and
ZERO
keys.
Press
ZERO
key again for setup over range (3.1.o) or additional with
UP
key under range (3.1.U).
The display shows in both cases 099999.9. By using the
UP/DOWN
and
TARE
keys you have to setup
each number of the 6 digit display to 01600.0 for over range and 00200.0 for under range. As default, the
under range
value is always negative, shown trough the ‘-‘ LED in the display (left lower corner).
Leave each menu point with the
ZERO
key.
This procedure defines the over range to 1600.0, which leads @ weight readings of >1600.0kg to all upper
LEDs of the 6 display numbers.
This procedure defines the under range to -200.0, which leads @ weight readings of <-200.0kg to all lower
LEDs of the 6 display numbers.
Press the
TARE
key two or three times and the DAD 141.1 will be back in weighing mode.
Calibration is now completed and stored. Please switch 1x OFF/ON for new TAC value.
Remark
After calibration procedure you can adjust the filter settings back to your application.
As rule of thumb you can calculate the weight/force true value of nearly100% as 1/cut off frequency.
Examples:
-
fcut = 0.5Hz means it takes about 2 seconds for the true value
– the value will increase while these
2 seconds to the true value.
-
fcut = 8Hz means it takes about 0.125 seconds for the true value
– the value increase take only
125 milliseconds.
Practicle Hint
A mix between gravimetric & electronic calibration is possible, too. For silos or tanks can a complete
gravimetric calibration lead to a problem when you have to apply e.g. 50 tons. In such a case we recommend
to calibrate zero gravimetrically (dead load of silo / tank) and span electronically (average mV/V values of load
cells).
