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ADwin
19
18
17
16
15
14
13
12
11
10
9
8
37
36
35
34
33
32
31
30
29
28
27
ANALOG IN
Fig. 6 – Pin assignment of analog channels with Gold-D option
5.1.1 Analog Inputs
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).
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.
BNC-
IN x
jack
GND
Fig. 7 – Input circuitry of an analog input
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).
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).
ADwin-Gold USB / ENET, manual version 3.8, October 2005
7
6
5
4
3
2
1
19
18
17
26
25
24
23
22
21
20
37
36
35
(female)
MUX
InAmp
330k
+
-
330k
16
15
14
13
12
11
10
9
8
7
6
5
4
3
34
33
32
31
30
29
28
27
26
25
24
23
22
ANALOG OUT
(male)
PGA
to
+
ADC
-
G = 1, 2, 4, 8
Inputs and Outputs
2
1
21
20
Multiplexer
Differential
16-bit and 14-bit
measurements
ADC instruction
11
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