ADwin-Gold
USB / ENET, manual version 3.8, October 2005
11
Inputs and Outputs
ADwin
Fig. 6 – Pin assignment of analog channels with Gold-D option
5.1.1 Analog Inputs
Multiplexer
The system has 16 analog inputs IN1 … IN16. The inputs with odd numbers (1,
3, … 15) are allocated to multiplexer 1, those with even numbers (2, 4, … 16)
to multiplexer 2. The output of each multiplexer is connected to both a 14 bit-
ADC and a 16 bit-ADC (see also Block diagram of the ADwin-Gold, page 4).
Differential
The analog inputs are differential. For each of the measurement channels there
is a positive and a negative input, between them the voltage difference is mea-
sured (but not free of potential). Both, the positive and negative input have to
be connected.
The inputs are equipped with male BNC-plugs, which are arranged in 2 rows;
the Gold-D option has the inputs connected to the DSub-connector ANALOG
IN. At the BNC-plugs, the positive input is the inner conductor, the negative
input is the outer conductor.
Please note, that the inputs do need a mass connection between the system’s
GND-plug and the signal source. This is in addition to the connections to the
positive and negative input.
Fig. 7 – Input circuitry of an analog input
16-bit and 14-bit
measurements
You can convert the signals at the multiplexer outputs optionally with a 14-bit or
a 16-bit analog-to-digital-converter (ADC), (see Fig. 2 "Block diagram of the
ADwin-Gold"). You are measuring with
– the 14-bit ADC very fast (max. 0.5µs, resolution 1.221mV)
– the 16-bit ADC very accurately (max. 5µs, resolution 305µV).
ADC instruction
The instructions
ADC()
for the 16-bit ADC and
ADC12()
for the 14-bit ADC
execute a
complete measurement
with one of the ADCs on the analog input.
The ADC instructions consider for instance the settling of the multiplexer and
assure perfect measurements (see also
ADbasic
manual).
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
IN 1 (
+
)
IN 2 (
+
)
IN 3 (
+
)
IN 4 (
+
)
IN 5 (
+
)
IN 6 (
+
)
IN 7 (
+
)
IN 8 (
+
)
IN 9 (
+
)
IN 10 (
+
)
IN 11 (
+
)
IN 12 (
+
)
IN 13 (
+
)
IN 14 (
+
)
IN 15 (
+
)
IN 16 (
+
)
DGND
IN 1 (
-)
IN 2 (
-)
IN 3 (
-)
IN 4 (
-)
IN 5 (
-)
IN 6 (
-)
IN 7 (
-)
IN 8 (
-)
IN 9 (
-)
IN 10 (
-)
IN 11 (
-)
IN 12 (
-)
IN 13 (
-)
IN 14 (
-)
IN 15 (
-)
IN 16 (
-)
ANALOG IN
(female)
R
ESER
VED
R
ESER
VED
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
ANALOG OUT
(male)
OUT
1
OUT
2
DGND
GND 1
GND 2
RESERVED
RESERVED
BNC-
jack
IN x
330k
330k
InAmp
+
-
to
ADC
MUX
PGA
G = 1, 2, 4, 8
+
-
GND
