3B Scientific SW Sensors Set (115 V, 50__60 Hz) - Manual (Page 2)

2
Dynamic force sensor set-up
The sensors are optimally designed to be mounted on
stands assembled from the SW stand equipment set
(1012849). (See instructions for pendulums listed
below.)
In addition, they can be mounted on plates or on
any rods of 10-mm diameter by means of their
knurled screw.
Caution: Dynamic force sensors must not be
subjected to mechanical overloading
• Neither sensor hook may be loaded with
more than 5N in the axial direction and 1 N
in transverse direction.
• Be especially careful with the maximum
loading force when assembling the system
or suspending loops or springs from the
hook.
2.2 MEC electronics board
12V AC
M
f
A
B
C
Δϕ
AB
1a
1b 1c
1d
Fig. 1 MEC electronics board
1a Connector for plug-in mains supply
1b A and B inputs for dynamic
force sensors
1c A and B outputs for dynamic force sensors
1d Δφ
AB
output for phase detector
Amplifier channels
Amplifier channels A and B on the MEC elec-
tronics board are used in conjunction with the
dynamic force sensors. The board converts the
signals from both sensors to make them suitable
for display in an oscilloscope or other display
instrument. The two channels have high internal
resistance. In addition, the phase difference
between the two signals can also be evaluated
and output. The other inputs on the board are
not used for this purpose.
Phase detector
A phase detector compares the waveforms for
channels A and B in the time domain to deter-
mine the difference in phase between them.
Output Δφ
AB
supplies the actual phase differ-
ence Δφ
AB
in the form of a DC voltage between
8 V (∆φ = 0°) and +8 V (∆φ = 180°).
3. Contents
2 Dynamic force sensors
2 HF cables
1 MEC electronics board
1 Plug-in power supply, 12 V AC
4. Technical data
Dynamic force sensor
Maximum force
Axial plane:
5 N
Radial plane: 1 N
Lower frequency limit: 0.2 Hz
Connector: 3.5-mm
jack plug
Length of cable 0.8 m
Dimensions: 52 x 37 x 26 mm approx.
Weight: 80 g approx.
Electronic board
Power supplied via plug-in mains transformer
Input sockets:
3.5-mm jack sockets
Output sockets: BNC
Amplifier A, B: Output ±8 V,
Ri = 100 MΩ
Ra = 1 kΩ
Phase detector (XOR): Output ±8 V,
Ra = 1 kΩ
Dimensions: 65 x 100 x 40 mm approx.
Plug-in power supply for 1012850
Primary side:
230 V, 50/60 Hz
Secondary side: 12 V AC; 700 mA
Plug-in power supply for 1012851
Primary side:
115 V, 50/60 Hz
Secondary side: 12 V AC; 500 mA
Only power the MEC electronics board from the
supplied 12 V AC mains transformer.