3 connection to earth ground, 2 rear panel, 1 sensors – INFICON STM-2XM 2-Channel Rate/Thickness Monitor User Manual
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STM-2XM Operating Manual
2.1.3 Connection to Earth Ground
If an earth ground is not established:
1
Where soil conditions allow, drive two 2.4 m (8 ft.) copper clad steel rods into
the ground 1.8 m (6 ft.) apart. Follow local regulations and codes.
2
Pour a copper sulfate or a salt solution around each rod to improve the
ground conductivity.
3
Measure the resistance. A near zero resistance between the two rods indicates
that a good earth ground is achieved.
4
After verifying a near zero resistance between the rods, connect the rods
together with a 7.62 cm (3 in.) wide copper strap.
2.2 Rear Panel
Figure 2-2 STM-2XM rear panel
CAUTION
Connecting cables must be routed away from any
potential source of electrical noise.
2.2.1 Sensors
The Sensors input provides the remote sensor oscillator interface to STM-2XM,
providing both the signal and power path to the oscillator.
NOTE: Sensors connection requires coaxial cable type RG58 or RG59.
The maximum BNC cable length connecting the oscillator to
STM-2XM is 30 m (98 ft.).
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