3B SCIENTIFIC® PHYSICS
1
Microphone box (230 V, 50/60 Hz) 1014520
Microphone box (115 V, 50/60 Hz) 1014521
Instruction sheet
01/14 SD/ALF
1 Plug-in
power
supply
2
Input socket
3
Amplitude adjustment knob
4 Selector switch: Signal, Level,
Pulse
5 Output
socket
A Channel
A
B Channel
B
1. Safety instructions
The microphone box conforms to all safety regu-
lations for electrical measuring, control, moni-
toring and laboratory equipment, as specified
under DIN EN 61010, Section 1. It is intended
for operation in a dry environment, suitable for
the operation of electrical equipment and sys-
tems.
Safe operation of the equipment is guaranteed,
provided it is used correctly. However, there is
no guarantee of safety if the equipment is used
in an improper or careless manner.
If it may be assumed for any reason that non-
hazardous operation will not be possible (e.g.
visible damage), the equipment should be
switched off immediately and secured against
any unintended use.
•
Use the equipment in dry rooms only.
•
Only operate using the supplied plug-in
power supply.
•
Do not apply any external voltage to the
output sockets.
2. Description
The microphone box is a universal, dual-channel
amplifier for electret microphones with a band
width of 10 Hz to 40 kHz. Both channels (A und B)
can be switched between Signal, Level and Trig-
ger modes. The sensitivity of the pre-amp is ad-
justable and allows measuring instruments and
oscilloscopes to be connected directly. The
threshold for the trigger is also adjustable. The
microphone box is particularly suitable for use with
long and short microphone probes and the micro-
second counter in order to carry out experiments
on the speed of sound.
The microphone box with order number
1014521 is intended for a mains voltage of
115 V (±10%), whereas the one numbered
1014520 is for 230 V (±10%).
