INFICON STM-2 USB Thin Film Rate/Thickness Monitor - Manual (Page 24)

2 - 4
PN
07
4-
61
3-
P1
A
STM-2 Operating Manual
2.3 Switching Between Internal and External Oscillator
Three jumpers must be repositioned inside the STM-2 case to switch between the
internal oscillator and an external oscillator.
CAUTION
STM-2 contains delicate circuitry, susceptible to
transient power line voltages. Disconnect the USB cord
whenever making any sensor connections or when the
case is open.
CAUTION - Static Sensitive Device
Observe proper ESD procedures when the STM-2
case is open.
Remove the two phillips screws which secure the back of the case, and remove the
back of the case.
Near the BNC connector are three jumpers on the circuit board, labeled Internal
and External. Move all three jumpers:
 To Internal for internal oscillator operation (see Figure 2-3 ).
 To External for external oscillator operation.
Figure 2-3 Jumpers set for internal oscillator operation