O P E R A T I N G I N S T R U C T I O N S
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Version 07/10
Waveform Generator FG 250D
Item-No. 12 38 00
Intended Use
The FG 250D is intended to be used to generate sine, triangle and square wave signals with a
frequency range of 1 - 250 kHz for professional use in garages and in the laboratory and service
section. To test LF circuits a waveform generator is virtually indispensable. The amplitude of the
sine and triangle wave signals can be adjusted from 100 mVss to 5 Vss. The amplitude of the
square wave corresponds to a TTL level (+5V). These waveforms are excellent for testing
control circuits, testing analogue and digital circuits as well as for determining the frequency
response of LF amplifiers, filters or loudspeakers. A DC coupled output with stepless offset
allows a variety of applications for digital circuits. In this way, making measurements in the LF
range is made much easier.
The device’s front stand can be folded out, for easier use and readability.
The device is constructed according to protection class II. It is only approved for connection to
a mains socket with protective earth and a standard AC voltage of 230V 50Hz.
Do not use under adverse ambient conditions. Adverse ambientconditions are:
- Damp or excess air humidity
- Dust and flammable gases, vapours or solvent.
- Thunderstorms or similar conditions such as strong electrostatic fields etc.
Any use, other than the one described above, may damage the product. Moreover, this involves
hazards such as e.g. short circuit, fire, electric shock, etc. It is not allowed to modify or rebuild
any part of the product!
The safety instructions are to be observed without fail!
Safety Instructions
Please read all of the operating instructions before using the product for the
first time; they contain important information about the correct operation.
The warranty will be void in the event of damage caused by failure to observe
these safety instructions! Liability for any and all consequential damage is
excluded!
Nor do we assume any liability for material and personal damage caused by
improper use or non-compliance with the safety instructions! The
warranty will be void in such cases.
This device left the manufacture’s factory in a safe and perfect condition.
We kindly request the user to observe the safety instructions and warnings contained in the
enclosed operating instructions so this condition is maintained and to ensure safe operation. The
following symbols must be observed:
A triangle containing an exclamation mark indicates important information in these
operating instructions which is to be observed without fail.
The product is CE compliant and meets the requirements of the applicable
European and national guidelines.
Warning! This is a class 1B device. This device can cause radio interferences in
residential areas; in which case the owner may be required to take appropriate
measures.
Protection class 2 insulation (double or reinforced insulation)
Only to be used in dry indoor areas.
The unauthorized conversion and/or modification of the product is inadmissible for reasons of
safety and approval (CE).
If you have doubts about how the equipment should be operated or how to connect it safely,
consult a trained technician.
The device must not be opened. If you open covers or remove parts – unless you can do this
by hand – life parts may be exposed. Capacitors inside the device may still be charged, even if
the device has been disconnected from all voltage sources.
Observe the safety and operating instructions of any devices you connect to the device, as well
as those you find in the individual chapters of these operating instructions.
Never touch the device with wet or moist hands. There is danger of a life-threatening electric
shock.
Measurement devices must not be left unattended when in use.
Do not use non-insulated metallic leads. Only use suitable measuring leads.
Keep the unit out of the reach of children. It is not a toy.
On industrial sites, the accident prevention regulations of the association of the industrial
workers’ society for electrical equipment and utilities must be followed.
Measurement instruments used at schools, training facilities, do-it-yourself and hobby
workshops should not be handled unless supervised by trained, responsible personnel.
The device will become warm during operation. Ensure there is sufficient ventilation provided;
do not cover the housing!
Do not use in the immediate vicinity of strong magnetic or electromagnetic fields, transmitter
aerials or RF generators. These could lead to incorrect measurements being made.
If you have a reason to believe that the device can no longer be operated safely, disconnect it
immediately and secure it against being operated unintentionally. It can be assumed that safe
operation is no longer possible if:
• the device is visibly damaged,
• the device no longer works and
• the device was stored under unfavourable conditions for a long period of time or
• it has been subjected to considerable stress in transit.
You should also heed the additional safety instructions in each chapter of the operating instruc-
tions for the connected devices.
Never switch the device on immediately after taking it from the cold into a warm environment.
Condensation that forms might destroy your device. Allow the device to reach room tempera-
ture before switching it on.
The unit is not designed to be used on humans or animals.
Package Contents
Waveform generator
Operating Instructions
Controls
(1) Power switch for switching on the device (1=ON (pressed in) / 0=OFF)
(2) Power indicator
(3) Two-line display with frequency and signal parameters
(4) Multifunctional cross button for frequency and parameter settings
(5) Amplitude setting control
(6) Offset setting control
(7) BNC output socket (50 Ohm)
Getting Started
The device is constructed according to protection class 2 and has a protec-
tive separation against the mains voltage. The outputs are potential-free.
Always turn the device off when it is not in use.
Set up and switching on
Place the device on a stable, level and robust surface. If necessary, the front stand can be
folded out.
Connect the standard Euro-plug to a suitable mains socket.
To switch on the device, press the operating switch „Power“ (1) until it catches. The power indi-
cator (1) lights.
To turn off, press the switch again.
Operation
Switch on the device at the power switch (1). The power indicator (2) should light up.
To setup the waveform and the output frequency the button areas „up, down, left and right“ on
the cross button (4) are used.
To select the input frequency, the cross button has a touch point in the centre („Enter“).
The settings are stored internally and are non-volatile, they remain even after the device is
switched off.
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