3B SCIENTIFIC PHYSICS U189021 Instructions D'utilisation page 9

•
Hold the yoke in place with your thumbs and
use your fingers to pull the magnet unit towards
the front till the yoke is between the two mag-
nets. Then take the entire unit out of the basic
unit (see Fig. 5).
•
Take the discs out of the sample chamber.
Fig. 5 Removing the magnet unit from the basic unit
6.2 Connection to control console
•
Insert the probe into the sample chamber in
such a way that it rests on the housing (see Fig.
6).
•
Connect the cable for the probe to the "Probe
In" socket of the control console, taking note of
the socket's slot.
•
Connect the coils to the "Coil" sockets on the
back of the control console.
•
Connect the control console to its power supply
via the "12 VAC/1A" socket.
Fig. 6 Basic unit with probe
6.3 Calibration and settings
6.3.1 Using an oscilloscope
•
Connect the "SIGNAL OUT" socket of the control
console to channel 1 of the oscilloscope and the
"FIELD OUT" output to channel 2 (see Fig. 8).
•
Set the oscilloscope as follows:
Channel 1: 0.5 V DC
Channel 2: 0.5 V DC
Time base: 5 ms
Trigger from a falling edge on channel 1.
6.3.2 Using 3B NETlog™
•
Connect the "SIGNAL OUT" socket of the control
console to input
and "FIELD OUT" to the input
•
Connect the 3B NETlog™ unit to a computer and
run the 3BNETlab
•
Create a new data record from the "Measure-
ment lab" menu and define the following pa-
rameters:
Input A: Field, Input mode VDC, Input range 2 V
Input B: Signal, Input mode VDC, Input range 2
V
Measurement interval: 500 μs (2 kHz)
•
Set to trigger from Input A with a falling edge
and a positive trigger point at about 10 to 20%.
•
Activate the "Oscilloscope" button and start
measuring.
The oscilloscope window will open.
6.4 Experiment procedure
•
Insert the glycerine sample (yellow top) into the
sample chamber (see Fig. 7).
Fig. 7 Basic unit with glycerine sample inserted
•
Set a frequency of about 13 MHz on the control
console (since the frequency knob is a 10-turn
potentiometer, it may need to be turned by mul-
tiple revolutions).
•
Set the sensitivity to medium and adjust if nec-
essary.
At the optimum setting, the LED can be seen to
flicker slightly. If the LED lights up fully, the signal is
overloaded.
3
IN
U on the 3B NETlog™ unit
B
IN
U .
A
TM
software