Configuring The Clm100 - Maretron CLM100 User Manual

Wire Gauge (AWG)
26
24
22
20
18
16
14
12
10
Calculate the voltage drop across the cable by multiplying the maximum current (20mA) times
the length of the cable. For example, if you are extending the cable by 500 ft. and are using
22AWG wire, then the voltage drop is calculated as follows:
First, calculate the resistance of the wire
be multiplied by two, because the current needs to travel from the CLM100 to the transducer
and then back again.
��
Now, multiply the resistance of the wire by the maximum current (20mA) to calculate the total
voltage drop across the extension cable ��
Finally, subtract the voltage drop from the minimum power supply voltage created by the
CLM100 to calculate the voltage at the transducer ��
So, for this example, if your transducer can operate with a minimum supply voltage of 11.68V,
the wire can be extended to this length.
If your calculated ��
��
then you have two choices:
 Move the CLM100 closer to the transducer to reduce the wire length, or
 Use a larger gauge wire to reduce the wire resistance

4 Configuring the CLM100

The CLM100 has several configurable parameters, which are shown below including the default
values. If you are not using the default values, then you will need to refer to the corresponding
section for configuring the CLM100 appropriately.
Revision 1.0
(Ω/1000ft)
��
��������
40.81
25.67
16.14
10.15
6.385
4.016
2.525
1.588
0.998
= 2 × �� × ��
�������� ��������
�� = �� × ��
�������� ��������
�� = 12V − 0.32V = 11.68V
��
is less than the minimum supply voltage specification of your transducer,
R
. Remember that the wire length
WIRE
16.14Ω
= 2 × 500ft ×
����
1000ft
.
��������
= 16.14Ω × 0.020A = 0.32V
������
.
��
(Ω/1000m)
��
��������
133.9
84.22
52.96
33.31
20.95
13.17
8.286
5.211
3.277
L
WIRE
= 16.14Ω
needs to
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