A precision battery-powered generator providing differential low-level, low-frequency waveforms for repair, testing and calibration.

Price $599.00
Made in USA

Product Information:

The Model 220 Function Generator is designed especially for the biomedical and low-level instrumentation field, offering features not found on any other generator in its price range. It provides constant amplitude sine, square, and triangle waveforms, with a frequency range of 0.01 Hz to 10kHz. It features a calibrated and continuously variable output from zero to ten volts peak-to-peak, utilizing a vernier control and six switch-selected full scale ranges of 100uV, 1mV, 10mV, 100mV, 1.0V and 10V. Accuracy is +/-2% of full scale on each range and has a constant output impedance of 100ohms. The output mode switch allows selection of differential (balance) or common (single-ended) outputs.

The differential and common mode outputs provide a convenient way to measure the common mode rejection ratio of differential amplifiers. The CMRR is simply calculated by dividing the function generator's common mode amplitude setting by the differential mode amplitude setting which produces the same deflection as displayed on a monitor screen or the same voltage output of an amplifier being tested.

Housed in a lightweight, high-impact ABS plastic case, and being battery-powered, the Model 220 Function Generator is ideal for bench or field use. Being battery-operated, it can eliminate possible ground loops and reduce AC interference, which can be so troublesome when working with low-level signals. A blinking power-on LED, located on the front panel, serves as a reminder to turn off the generator when not in use, thereby extending battery life. This same LED also functions as a low battery indicator.

The Model 220 Function Generator will provide the user with a fast and convenient way to test, calibrate and service a wide range of differential and common-mode input instruments such as monitors, oscilloscopes, recorders, amplifiers, etc. In addition, the low frequency and low amplidtude waveforms can be used to calibrate and verfy calibration of EEG/Polygraph instrumentation and power spectral analytic software/hardware.

Model 220 Operation Manual:

Click here to download the Model 220 Operation Manual


All simulators and function generators are guaranteed to be free from defects in materials and workmanship for a period of one year (excluding batteries). Seller will repair or replace (at Seller's option) any simulator or generator which proves to be defective within the warranty period. Permission must be obtained from Seller before returning any instrument. In no event shall the Seller be liable for consequential or special damages of any kind. Under no circumstances shall this instrument be used in a life support application.

This product is not designed for diagnostic purposes.


  • 0.01 Hz to 10 kHz frequency range
  • Sine, triangle, square waveforms
  • Differential, common-mode outputs
  • Calibrated output attenuators
  • Output variable from 10uV to 10.0 volts
  • Lightweight and battery-powered by two 9V batteries
  • Battery life is approximately 100 hours


  • Switched Amplitude Control
  • Switched Frequency Control

Physical Specifications:

  • Case: High impact-resistant ABS plastic
  • Size: 2.5" H, 8.08" W, 6.25" D
  • Weight: 28 oz