3B Scientific SW Ultrasonics Set (115 V, 50__60 Hz) - Manual (Page 4)

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A and B and converts the results into a DC cur-
rent proportional to the phase difference. This
current is then fed via the input socket of chan-
nel A to the ultrasonic pen. If the phase differ-
ence is a multiple of 360°, the brightness of the
LED on the pen will be reduced to a minimum.
Generator G1:
Frequency: 40.000
kHz,
stabilised by quartz os-
cillator
Amplitude: Adjustable
Output:
2 BNC sockets,
connected in parallel
Generator G2:
Frequency range 1:
38 … 42 kHz approx.
Frequency range 2: 24 … 26 kHz approx.
Frequency ranges: Switchable
Amplitude: Adjustable
Output:
2 BNC sockets,
connected in parallel
Amplifiers (channels A and B):
Input resistance:
10 kΩ
Bias: 8 V
Gain 100 approx.
Output resistance: 1 kΩ
Frequency range: 2 kHz … 43 kHz
(± 3 dB) with high-pass
filter
2 Hz … 43 kHz
(± 3 dB) without high-
pass filter
Inputs: Jack sockets
Outputs: BNC sockets
Phase comparison between A and B:
Control current for
ultrasonic pen:
0 …15 mA (DC)
Coupling with B: Generator signal G1,
Generator signal G2
or off
General data:
Power supply:
12 V AC, 500 mA
from plug-in transformer
Dimensions: 100x140x45 mm approx.
Weight: 530 g approx. including
plug-in power supply
Plug-in power supply for 1012845:
Primary side:
230 V, 50/60 Hz
Secondary side: 12 V AC; 750 mA
Plug-in power supply for 1012846:
Primary side:
115 V, 50/60 Hz
Secondary side: 12 V AC; 500 mA
5.2 Ultrasonic transmitter, 40 kHz
Ultrasonic transmitter for setting up on a table
top with an ultrasonic transducer located flush
with the exit opening inside a square aluminium
tube. Gently curved resonance characteristic for
operation in frequency range 1 of Generator G2
or at a frequency of 40.000 kHz.
Note: Frequency range 2 on the ultrasonic elec-
tronics board can only be output using a sepa-
rate ultrasonic transducer which is not included
in the SW ultrasonics set.
Input voltage: 20 V AC RMS/
70 Vpp max.
Impedance: > 500 Ω
Acoustic pressure: 110 dB at 10 V
Band width: > 7 kHz/-90 dB
Frequency: 40 kHz (±1 kHz)
Connectors: BNC plugs
Dimensions: 20 x 20 x 60 mm approx.
Cable length: 1 m approx.
5.3 Microphone probe
Warning: The transducer in the microphone
probe is sensitive to moisture and mechanical
effects.
• Do not subject the transducer to any me-
chanical stresses and do not let it come into
contact with liquids.
Microphone probe for setting up on a table top
with transducer positioned flush with the entry
opening in a thin metal tube.
Frequency range: 1 Hz to 43 kHz
Output: Signal for
channel A or B
Connectors: 3.5-mm jack plugs
(tip)
Cable length: 1 m approx.
Dimensions: 6 mm x 150 mm approx.
Weight: 25 g approx.