24
ADwin-Gold
Hardware Manual, Version 2.3
ADwin
The position of the gain and offset trimmers is described in the figure above.
The dotted frame shows how the trimmers are allocated to the converters, that
is, an offset and gain potentiometer for each of the converters. The trimmers
can be found
between the printed circuit boards
and have lateral adjusting
screws (in the picture they are adjusted in upward position).
The position of the trimmers for the DA add-on can be found in the description
of the DA add-on.
6.3 Initializing the Software
– Start
ADbasic
, boot the system and open the window: „Options/Parameter“.
– Enter in
ADbasic
the programs described in chapter 6.5. Afterwards compile
and start these programs.
You can execute the programs either individually or all together (with diffe-
rent process numbers).
In the window „Options/Parameter“ you can set and compare the parameters:
Output channel DAC:
PAR_10
Output value DAC:
PAR_9
(default value 32,768 => 0 V)
Input channel ADC:
PAR_3
Input value ADC:
PAR_1
, mean value in
FPAR_1
for 16-bit ADC
PAR_2
, mean value in
FPAR_2
for 12-bit ADC
Please pay attention to the fact that the set channel corresponds to the con-
nected measurement cables during the following adjustment.
The values indicated in the programs refer to the voltage range of 20 Volt
(-10V...+10V) of the
ADwin-Gold
at the analog inputs and outputs.
Notes for the conversion of voltage into digits, digits into voltage as well as
information about the quantization levels (
U
LSB
)
and the offset
(U
OFF
) can be
found in chapter 5.1.3.
Please pay also attention to the information about INL and DNL in chapter 5.1.3.
12 Bit ADC-2
LTC1410
16 Bit ADC-2
LTC1605
12 Bit ADC-1
LTC1410
16 Bit ADC-1
LTC1605
DAC-1
DAC712
DAC-2
DAC712
INA-1
PGA206
INA-2
PGA206
OPA-1
OPA2131
J15
J7
J9
J5
J11
J3
J16
J14
J13
J12
J10
J8
J6
J4
J2
J1
P11 P12
P9 P10
P7
P8
P5
P6
P1
P2
P3
OPA27
LS175
LS175
OPA27
LS125
ALS14
721
836
8921
721
836
721
836
F32
ALS14
LS125
OFF GAIN
OFF GAIN
OFF
GAIN
OFF
GAIN
OFF GAIN
OFF GAIN
OPA
2132
ALS175
DC-DC-converter
LM399
MUX-1
ADG407
MUX-2
ADG407
ADwGLD11
P4
Buffer DAC-1 & -2
Position of the trimmers
Conversion of digits into
voltage
Figure 6-1: Position of the potentiometers for calibration
6. Calibration
