struers Tenupol-3 Gebrauchsanweisung Seite 14

Adjusting screw for photo sensitivity
(Fig. 10.11)
Adjusting knob
for timer (Fig. 10.12)
Push button for
Start/stop (Fig. 10.13)
Voltmeter (Fig. 10.5)
Ammeter (Fig. 10.7)
Start/Stop-diode (Fig. 10.14)
12
Tenupol-3
Instruction Manual
With the adjusting screw the dial range for the photo sensitivity is moved.
When the screw is turned counter clockwise the intensification of the signal
from the photo cell is reduced, and reverse, when it is turned clockwise. The
ratio between the luminous intensities in the two outer positions is approx.
1:4. The procedure is described in detail in section OPERATION, Operation
Parameters.
When pre-thinning and blanking electrolytically it may be an advantage to
perform the polishing with time control. The process is then carried out in
the preset span of time. The photo cell system will switch off the process
before the set time is out (photo sensitivity higher than 0), if a hole
unexpectedly develops in the specimen.
The start/stop-button is activated when the process parameters are set, just
as the polishing unit must be prepared for a process performance as far as
electrolyte, jets, specimen holder etc. are concerned. The process is
automatically switched off, either when the IR-detector system registers a
hole in the specimen, or if the preset time on the timer is out.
The process can be switched off manually by re-activating the Start/Stop-
button. Switching off the process is marked by a sound signal, whether it is
switched off manually or automatically.
The push-button is also used together with the main switch (Fig. 10.1) when
the instrument is set in "Adjust Mode" for adjusting the flow rate. The
procedure is described in section OPERATION, Operation Parameters
2.5.2. Reading of Instruments and Indicators
The voltmeter is a double dial instrument with max. reading for 40 V and
120 V respectively. Change-over between the two dial ranges is done
automatically when selecting voltage range with the switch (Fig. 10.3). The
voltmeter is cut in when the polishing is started on the push button
Start/Stop.
The ammeter is a dial instrument with max. deflection for 5 A. With the
selector button (Fig. 10.6) the deflection range can be changed in the scale
1:10 so that full deflection corresponds to 0.5 A. Always start with the
setting 5 A if the current is not known in advance in the actual process.
This diode indicates whether the IR-detector, depending on the preset photo
sensitivity, registers infrared light from the transmitter. The diode can light
either green or red, so that:
Red means light transmittance. I.e. there is no specimen holder in the
polishing cell or, there is no specimen in the specimen holder. When the
diode lights red the polishing cannot be started by activating the start
button.
Green means that there is no light transmittance. I.e. the light beam is
blocked by the specimen, presuming that the specimen holder is mounted
correctly in the polishing cell. The polishing can be started when the diode
lights green.