Campbell TDR200, Инструкция по эксплуатации

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TDR200-Based Time-Domain Reflectometry System
10
6.3 SDM8X50 Major Specifications
6.3.1 Physical
Consists of Size When Used
SDM8X50 50
Ohm Coaxial
Multiplexer
Multiplexer circuit
board encased in
metal housing and
a separate strain
relief bracket.
Both the circuit
board and bracket
include mounting
holes and hardware
for attaching them
to the backplate of
an enclosure
(typically the
ENCTDR100) or
to a wall.
Weight: 590 g
(1.3 lb)
Multiplexer Housing
Dimensions with
Mounts: 24.9 x 12.2
x 4.6 cm (9.8 x 4.8 x
1.8 in)
Strain Relief
Bracket
Dimensions: 20.3 x
4.3 x 1.3 cm (8.0 x
1.7 x 0.5 in)
When the
multiplexer
will be housed
in the same
enclosure as
the datalogger
and power
supply or
when the
multiplexer
will reside in a
building
SDM8X50-E SDM8X50
multiplexer with an
ENC10/12
environmental
enclosure.
Enclosure includes
a bracket for
mounting to a
tripod, a tower, or a
1.0 in. to 1.25 in.
IPS Schedule 40
pipe.
Weight: 4.4 kg
(9.8 lb)
Enclosure Outside
Dimensions with
Mounts: 40.4 x 29.2
x 17.5 cm (15.9 x
11.5 x 6.9 in)
Enclosure Inside
Dimensions:
25.4 x 30.4 x 12.7
cm (10 x 12 x 5 in)
When the
multiplexer
will be housed
in its own
enclosure
without the
datalogger and
power supply
Temperature range: –40 to 55 °C
6.3.2 Electrical
Input power: 12 Vdc
Quiescent current drain: < 1 mA
Current drain during switching: ~90 mA (all multiplexers of the same level
switch simultaneously for less than 1 s.
See FIGURE 7-1 , TDR System
Components
(p. 11)
.)
Relay contact life expectancy:
100 x 10 6 operations