Level Mode - 3B SCIENTIFIC PHYSICS 1014520 Manual De Instrucciones

3. Contents
1 Microphone box
1 Plug-in power supply
1 Instruction sheet
4. Technical data
Inputs:
Channels: 2 separate channels for electret
microphones
Inputs: 3.5 mm jack plugs
Outputs: BNC socket
Output
impedance: 1 kOhm
Gain: 20 to 70x
Band width: 10 Hz to 42 kHz
Output signal: Switchable
Level and Pulse
Sensitivity using microphone 4008308:
800 mVpp approx. at 80 dB
noise level, 1 kHz and minimum
gain
2.5 Vpp approx. at 90dB noise
level, 1 kHz and minimum gain
Outputs:
Signal: 0 - 14 Vpp max.
Level: 0 - 7 V DC max.
Puls: Low: 0 V, High: 8 V DC, length:
150 ms
General data:
Voltage supply: Plug-in power supply 12 V AC,
500 mA
Dimensions: 100 x 75 x 35 mm³ approx.
Weight: 450 g approx. incl. plug-in
power supply
5. Additionally required equipment
1 Microphone probe, short
or
1 Microphone probe, long
6. Operation
6.1 Amplifier (signal) mode
•
Set the selector switch to ~ (Signal), con-
nect an electret microphone to the input and
an oscilloscope or amplifier to the output.
•
Set the required gain with the amplitude
knob.
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between Signal,
4008308
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2

6.2 Level mode

•
Set the selector switch to = (level) and con-
nect an electret microphone to the input.
•
Set a measuring instrument (meter) to the
required DC measuring range and connect it
to the output.
•
Set the required gain with the amplitude
knob.
6.3 Trigger (pulse) mode/measurement of
time in motion
•
Set both switches to _∏_ (Trigger or Pulse)
and connect an electret microphone to the
input of Channel A to detect the start pulse.
•
Connect another microphone to the input of
Channel B to detect the stop pulse.
•
Connect the start input of the counter to the
output of Channel A and the stop input of
the counter to the output of Channel B. Both
amplitude knobs should be set to the same
gain.
Caution: the gain should be turned down
enough to ensure that the trigger is not set off by
noises from the surroundings.
7. Example experiment
Determining the speed of sound in Kundt's
tube
Additionally required:
1 Microsecond counter (230 V, 50/60 Hz) 1017333
or
1 Microsecond counter (115 V, 50/60 Hz) 1017334
1 Kundt's tube E
1 Pulse box K
1 Microphone probe, long
1 Microphone probe, short
2 HF patch cords, BNC/4-mm plugs
•
Place the microphone probes in the Kundt's
tube and set up the apparatus. (see Fig. 1)
•
Connect the long microphone probe to the
Channel A input of the microphone box and
connect the short one to the input for Chan-
nel B.
•
Use a BNC/4-mm adapter cable to connect
the output of Channel A to the Start input of
the microsecond counter (plug red 4-mm
plug into green socket, black 4-mm plug into
black ground socket).
•
Connect the output of Channel B to the Stop
input of the microsecond counter (plug red
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