INFICON STM-2XM 2-Channel Rate/Thickness Monitor - Manual (Page 127)

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PN
07
4-
61
4-
P1
A
STM-2XM Operating Manual
6.2 Maintenance
Routine maintenance is not required for STM-2XM. Regular sensor maintenance
procedures should be followed according to the sensor operating manual.
6.3 Spare Parts
Oscillator . . . . . . . . . . . . . . . . . . . . . PN 783-500-013
BNC Cable (15.2 cm (6 in.)) . . . . . . . PN 782-902-011
BNC Cable (3.0 m (10 ft.)) . . . . . . . . PN 782-902-012-10
BNC Cable (7.6 m (25 ft.)) . . . . . . . . PN 782-902-012-25
BNC Cable (15.2 m (50 ft.)) . . . . . . . PN 782-902-012-50
6.4 Persistent Crystal Fail Indication
Remote oscillators have a test feature to help isolate this type of problem (see
Figure 6-1 ). To activate the test feature, press the Push to Test button using a
small, pointed object, such as a pencil or small screwdriver. This connects the
internal test crystal to the circuit instead of the normal Sensor connector. If
STM-2XM and the oscillator are functioning correctly, the BAD indicator will be
replaced with a crystal life percentage while this button is depressed.
If crystal life is displayed while the Push to Test button is depressed, the problem
has been isolated to be in the path between the oscillator and the sensor head. If
the bad crystal indication continues while the Push to Test button is depressed,
the problem is either the programming of the sensor selection, in the electronics of
the oscillator, or the STM-2XM unit.
Figure 6-1 OSC-100A oscillator