3B Scientific Microwave Set 9.4 GHz User Manual

3B SCIENTIFIC

Microwave Set 9.4 GHz (230 V, 50/60 Hz)

Microwave Set 10.5 GHz (115 V, 50/60 Hz)

1009951 / U8493600-230
1009950 / U8493600-115

Instruction sheet

08/11 ERL/ALF

®

PHYSICS

Control unit

1 Receiver terminal
2 Amplifier output
3 Amplifier output (ground)
4 Transmitter terminal
5 Modulation input (ground)
6 Modulation input
7 Modulator selector switch (inter-

nal/off/external),
8 Switch for internal speaker
9 Controller for receiver signal

amplification
10 Socket for 12-V AC plug-in power

supply (rear of case)

Accessories

11 Transmitter with horn antenna
12 Stand for prism
13 Paraffin prism
14 Reflection plate
15 Cover plate for double slit
16 Plate with double slit
17 Absorption plate
18 Polarisation grating
19 Receiver with horn antenna
20 Microwave bench
21 Microwave probe
22 Folding microwave bench with

plate holder

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1. Safety instructions

High frequency radio waves can penetrate biological
tissues and cause them to heat up. The microwave
transmitter included here is sufficiently low-powered
that the hazards are negligible when it is used cor­rectly.

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.

• Before setting up or starting any experiments,

check the housing and mains lead for any dam­age.

• If it is deemed that the equipment can no longer

be operated without risk (e.g. visible damage has
occurred), the equipment should be switched off
immediately and secured against any inadver­tent use.

• The transmitter is only permitted to be con-

nected to 3B-ELWE control unit.

• In schools and educational establishments, the

equipment may only be operated under the su­pervision of trained personnel.

• Avoid looking directly into the antenna horn of

the transmitter or the reflected beam.

• Only trained electricians are permitted to open

up the apparatus’ housing.

2. Description

This apparatus allows microwaves to be transmitted
and received.

The components and equipment included allow for
various experiments to be performed. These can
achieve both qualitative and quantitative results.

A narrow beam of electro-magnetic waves with wave­length in the cm range can be output by a transmit­ter and picked up using the horn antenna (19) or the
sensor probe (21). The modulation of the receiver
signal can be rendered audible by means of an in­ternal speaker, in which case the loudness of the
acoustic signal varies with the intensity of the re­ceived signal.

The microwave apparatus is powered via a 12-V AC
plug-in power supply.

The microwave apparatus 10.5 GHz (1009950) is for
operation with a mains voltage of 115 V (±10 %), and
the microwave apparatus 9.4 GHz (1009951) is for
operation with a mains voltage of 230 V (±10 %).

3. Contents

1 Control unit
1 Transmitter with horn antenna
1 Receiver with horn antenna
1 Microwave probe
1 Mikrowave bench, 800 mm
1 Microwave bench, 400 mm with plate holder
1 Reflection plate 180 x 180 mm²

1 Polarisation grating, 180 x 180 mm²
1 Absorption plate, fibreboard, 180 x 180 mm²
1 Paraffin prism
1 Stand for prism
1 Plate with double slit
1 Cover plate for double slit
1 Instruction sheet

4. Technical data

Transmitter with horn antenna:

Frequency of oscillator: 9,5 GHz (1009951)
10,5 GHz (1009950)
Transmitted power: 10 mW to 25 mW

Modulation type: AM
Modulation signal: Selector switch

Internal/off/external
Internal modulation: 3kHz approx.

80% AM approx.

External modulation: 100 Hz to 20 kHz,

max. 1 V
Acoustic signal: internal (switchable)
Output voltage: 10 V max.
Receiver with horn antenna: Silicon diode with

resonator
Microwave probe: Silicon diode with

resonator
Supply voltage: 12 V AC via plug-in

supply

Dimensions (control unit): 170 x 200 x 75 mm

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5. Operation

5.1 Set-up of base rails (basic set-up)

• Insert the central screw under the scale disc in

the hole in the long rail.

The default set-up is with the rails opened out in a
line (the arrow on the long rail points to “0°” on the
protractor scale.

• Move the articulated base so that the pointer

coincides with the zero point of the scale.

The pointer is aligned with the normal of the screen
holder and thus allows the angle of incidence to be
read off or adjusted directly (read off the outer nu­meric scale).

5.2 System set-up

• Connect to the mains.

• Connect the receiver with horn antenna or the

microwave probe to the receiver terminal (1).

• Connect the transmitter with horn antenna to

the transmitter terminal (4).

• Set up the transmitter and receiver on the base

rails as appropriate to the experiment.

• Set the controller for the signal gain of the

speaker (9) to its centre position.

• Use the switch (8) to turn on the speaker.

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