D
25
103
1,175
19.6 hours
8.1 days
3.5 wks
14 wks
3.2 Channels
There are two ‘types’ of channels with D, hardware channels and software
channels. The former is the electronic hardware that is fitted to your D. The
hardware that you have will be shown in the front of this manual in the “Hardware
Configuration Certificate”. There are potentially 54 hardware channels, though only a total of
16 can ever be in any one D. Channels can be used for a variety of inputs as is
shown on your certificate, eg. voltage, current, digital, etc. The electronic components will be
different in each case according to which input type that channel has been dedicated.
The connections for external sensors to the hardware channels will be marked on the
Hardware Configuration Certificate located in the Calibration Certificates booklet provided
with each logger. The connections and calibration for those sensors that require it, will be
covered in subsequent sections of the manual.
3.2.1 Voltage Input Channels
In reality each is a differential amplifier (that is an amplifier which measures the voltage
difference between both its inputs) but which has been has been arranged so that each of
its inputs may be used as a separate channel if required. Usually only one or two of these
channels will be fitted on any logger, though the full list is shown below.
Hardware Channel Number
Function and Description
0
Single ended Voltage Input, gain = 1, 10,100, or 1000
1
Single ended Voltage Input, gain = 1, 10,100, or 1000
2
Differential Voltage Input, gain = 1, 10,100, or 1000
(note that channel 2 uses the connections of channels 0 and 1)
3
Single ended Voltage Input, gain = 1, 10,100, or 1000
4
Single ended Voltage Input, gain = 1, 10,100, or 1000
5
Differential Voltage Input, gain = 1, 10,100, or 1000
(note that channel 5 uses the connections of channels 3 and 4)
6
Single ended Voltage Input, gain = 1, 10,100, or 1000
7
Single ended Voltage Input, gain = 1, 10,100, or 1000
8
Differential Voltage Input, gain = 1, 10,100, or 1000
(note that channel 8 uses the connections of channels 6 and 7)
9
Single ended Voltage Input, gain = 1, 10,100, or 1000
10
Single ended Voltage Input, gain = 1, 10,100, or 1000
11
Differential Voltage Input, gain = 1, 10,100, or 1000
(note that channel 11 uses the connections of channels 9 and 10)
12
Single ended Voltage Input, gain = 1, 10,100, or 1000
13
Single ended Voltage Input, gain = 1, 10,100, or 1000
14
Differential Voltage Input, gain = 1, 10,100, or 1000
(note that channel 14 uses the connections of channels 12 and 13)
14
