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numerical values for t
determined as above.
•
Set up a graph with the quantity E on the x-
axis and the quantity I on the y-axis. (See
Fig. 3).
Fig. 2 Connection of 3B NETlog
Fig. 3: Determination of critical potentials for helium atoms (curve recorded using 3B NETlog
7.2.2
Procedure with an oscilloscope
•
Connect output Fast1 on the control unit to
Channel 1 (X deflection) on the oscilloscope
and output Fast 2 to Channel 2 (Y deflec-
tion). (See Fig. 4)
•
Set the minimum voltage output V
control unit to approximately 10 V and the
maximum voltage to about 35 V. Use a mul-
timeter to measure the voltage between
socket 3 and ground or socket 4 and
ground, which will be a factor of 1000 times
smaller.
•
On the DC power supply, set the heater
voltage to 3.5 V.
and t
in s
1
2
+
OUT
3
1
60
200 mV
!
V
A
4
HERTZ TUBE CONSOLE
0...±1 VOLT OUT
0...±1 VOLT OUT
2
1 SLOW
FAST
2
1
RING
TM
to the control unit for critical potential tubes
on the
A
•
In order to display the ionisation curve,
reverse the polarity of the collector voltage.
MAX
3
Channel
V
Rate
Date/Time
SET
Store
A
4
MIN
SLOW
2
RUN
in
I
+
A
out
U
A
in
+
U
U
A
Oscilloscope settings:
Channel 1: 50 mV/div
Channel 2: 0.2 V/div
Time-base: 5 ms
Trigger on Channel 1
•
Vary the heating voltage, the upper and lower
limits of the accelerating voltage and the os-
cilloscope parameters until the best curve can
be seen.
•
In order to display the ionisation curve, re-
verse the polarity of the collector voltage.
•
Zur Aufzeichnung der Ionisationskurve die
Polarität
der
schen.
4
On/Off
out
U
B
in
+
B
TM
)
Kollektorspannung
vertau-
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