Jäger ADwin-Pro, System And Hardware Description

Page: 199 / 218

ADwin-Pro Hardware, manual version 2.9, June 2006
195
Calibrating a module
Calibration with Trimmers
ADwin
If the button "
Calibrate
" is not displayed in the "
Dialog
" window, the
selected module is calibrated by trimmers, see the following chapter 6.3.2
"Calibration with Trimmers" .
Calibration Connect the measurement device and the reference voltage source.
The individual calibration steps are described in the windows "
AOUT Cali-
brate
" or "
AIN Calibrate
". Please note that
– with the AIN modules the calibration of the ADC is effected via the input
channel 1.
– with the AIN-F modules the connected channel is selected in the window
"
Input channel
".
6.3.2 Calibration with Trimmers
Please note the general information in chapter 6.1 .
If access to the trimmers is not easily possible, use an adapter board with a
connector according to DIN 41612 with 96 pins. Please take into consideration
that the DAC and ADC are rapidly cooling down: Finish the calibration after
some minutes.
Offset and Gain
Program start Start ADbasic and boot your system.
Connecting Connect the measurement device and the reference voltage source.
Calibration programs In the annex of this chapter you will find the programs for easy and fast cali-
bration. You will find:
– The position of the offset and gain trimmers in the figures of your module
description in this manual.
– The configurations in the following fig. 327 , if you do not want to work
with the calibration programs.
– Please pay also attention to the previous notes about INL and DNL.
Caution: Risk of electric shock.
ADwin-Pro systems have a power supply device, which gives
access to high-voltage lines and connectors if the system is open.
The ventilation slots are wide enough to pass through an align-
ment tool of 2.5 mm (=0.1inch).
Calibrate the system only when it is closed!
Do not pass any conductive objects through the ventilation slots!
Max. value Max. test value
Mean test
value
Min. test value Min. value
Vo l -
tage Digits dec.
Digits hex. 65535
FFFFh
64080
FA50h
32768
800h
1456
5B0h
0
0h
-10V
to
+10V
16 bit
U
LSB
: 305.1758µV + 9.9996948V
+ 9.5556641V 0V - 9.5556641V - 10V
12 bit
U
LSB
: 4.8 9.9951172V
-5V
to
+5V
16 bit
U
LSB
: 152.5879µV + 4.9998474V
+ 4.7778320V 0V - 4.7778320V - 5V
12 bit
U
LSB
: 2.4 4.9975586V