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Hameg HM8131-2
Function Generator

• Direct Digitally Synthesized Function Generator
• Frequency Range: 10µHz to 15MHz
• Resolution: 100µHz
• Memory Card for Signal Registration
• Arbitrary Waveform Generation
• Keyboard Entry or Rotary Control of major parameters
• RS232-Interface included as Standard

Hameg HM8131-2 Shown

Product Information
Datasheet	186 KB
Manual	1.28 MB
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The HM8131-2 is a high performance, yet affordable, 15MHz Synthesized Function Generator. The instrument uses direct digital synthesis to generate standard waveforms such as sine, square, ramp, triangle and white noise, as well as arbitrary signals with synthesized frequency accuracy.

Direct keyboard entry or signal parameter adjustment via rotary control simplifies operation. Major settings like frequency, amplitude, offset voltage and sweep parameters can be directly input. Input of other functions are menu driven. Two lines of 20 characters each are displayed on a backlit LCD in order to present a clear indication of the instrument settings. To change a setting, all that's needed is to make a selection from the LCD and push the corresponding buttons.

The HM8131-2 can be remote controlled via the standard, built-in RS232 serial interface or by an optional IEEE-488-Interface which in that case replaces the serial interface. Interfaces are easily interchangeable at the field level. A standard S-RAM memory card enables the storage and recall of Arbitrary Waveforms up to a total capacity of 1MB.

Frequencies are displayed as a 12 digit presentation with 100µHz resolution. This remarkable high resolution is important, for example, for the stimulation of mechanical vibration. The standard timebase provides 2 ppm/°C frequency stability, thus making a frequency counter for checking the frequency unnecessary. An optional TCXO  timebase provides 0.5 ppm stability. Even greater long term stability can be achieved using an external timebase such as the HM8125 GPS Frequency Standard.

Linear and logarithmic frequency sweeps are quickly specified by entering start and stop frequencies and the sweep time. The entire frequency span of the HM8131-2 can be covered in one sweep. Sweeps can be triggered from the front panel, the internal rate generator, the external trigger input or the interface. Any waveform, incl. arbitrary waveforms, may be triggered. A burst can be generated by means of an external trigger signal.

The standard waveforms can be amplitude modulated, either internally or externally. The HM8131-2 also provides FSK and PSK- modulation. Signal phase can be adjusted down to 0.1 degree resolution. The phase relationship between multiple HM8131-2 sharing the same timebase is fixed with 0.1 degree phase accuracy lock.

The ability to generate arbitrary waveforms is another advantage of the HM8131-2. Arbitrary waveforms are generated at sample rates of 40 MS/s with 12 bits (0.025%) vertical resolution. The maximum output frequency is 15MHz. The HM8131-2 can store records as long as 4K or 16 K points. The waveforms can be point or vector edited from the front panel. Data for waveforms can be downloaded from any PC or transfered via memory card.

The output of the HM8131-2 has the low phase noise inherent to DDS (Direct Digital Synthesis). The wideband output amplifier provides low distortion as well as excellent pulse response. It can drive 10Vpp into 50 Ohm (20Vpp into high impedance loads) with less than 10ns risetime. The output is protected against externally applied voltages and is short-circuit proof. The output voltage can be read with a 3 1/2 digit resolution from the LCD. Offset voltage is adjustable up to ±5V.

The HM8131-2 contains non-volatile memory to store up to 10 complete set-ups of the instrument. This allows commonly used waveshapes, frequencies and modulations to be instantly recalled. In addition one 4k word arbitrary waveform can be stored as well as the power-down condition.

The HM8131-2 is a high precision instrument with easy operation, making it the ideal choice for a wide range of applications like product line testing, research and development, service, education and training. And best of all, the HM8131-2 is priced well below conventional function generators offering far less performance.