Biophysica Incorporated

Phone: 416-784-0463 or Toll Free 1-800-488-2032 from Canada, US and Territories -or- E-mail:

BF-19: Variable Frequency Generator

BF-19: Variable Frequency Generator


  • 0.3Hz ~ 3MHz Frequency Range
  • Sine, Square, Triangle, Ramp, TTL and CMOS Output Waveforms
  • External Voltage Controlled Frequency (VCF) Function
  • Duty Cycle Control with Signal Inversion Capability
  • Variable DC Offset Control
  • Two Step (-20dB x 2) and Variable Attenuator
  • Built-in 6 Digit Counter with INT/EXT Function up to 150MHz
  • INT/EXT AM/FM Modulation
  • LIN/LOG Sweep Mode
  • Gate Controlled Voltage (GCV) Output for Synchronisation
 BF-19: Variable Frequency Generator

Main Output

Frequency Range: 0.3Hz ~ 3MHz in 7 ranges
Amplitude: > 10Vpp (into 50W load)
Impedance: 50W ±10%
Attenuator: -20dB ±1dB x 2
DC Offset: <-5V ~ >+5V (into 50W load)
Duty Control: 80% : 20% : 80% to 1MHz continually variable
Display: 6 digit LED display


Sine Wave

Distortion: £1%, 0.3Hz ~ 200kHz THD £ -35dB fundamental in all ranges (specification applied from MAX to 1/10 level)
Flatness: <0.3dB, 0.3Hz ~ 300kHz
<0.5dB, 300kHz ~ 3MHz

Triangle Wave

Linearity: >98% 0.3Hz to 100kHz
³95% 100kHz to 3MHz

Square Wave

Symmetry: ±2% 0.3Hz ~ 100kHz
Rise/Fall Time: £100ns at maximum output (into 50W load)

CMOS Output

Level: 4Vpp ±1Vpp ~ 14.5Vpp ±0.5Vpp adjustable
Rise/Fall Time: £120ns

TTL Output

Level: ³3Vpp
Fan Out: 20 TTL Loads
Rise/Fall Time: £25ns


Input Voltage: 0V ~ 10V ±1V (100:1)
Input Impedance: 10kW ±10%


Output Voltage: To set the voltage between 0V ~ 2V as per different frequency

Sweep Operation

Sweep/Manual: Switch selectable
Sweep Rate: 100:1 ratio maximum adjustable
Sweep Time: 0.5s ~ 30s adjustable
Sweep Mode: Lin/Log switch selectable

Amplitude Modulation

Depth: 0 ~ 100%
MOD Frequency: 400Hz (INT), DC ~ 1MHz (EXT)
Carrier Bandwidth: 100Hz ~ 3MHz (-3dB)
EXT Sensitivity: £10Vpp for 100% modulation

Frequency Modulation

Deviation: 0 ~ ±5%
MOD Frequency: 400Hz (INT), DC ~ 20kHz (EXT)
EXT Sensitivity: £10Vpp for 10% modulation

Frequency Counter

INT/EXT: Switch selectable
Range: 0.3Hz to 3MHz (EXT 5Hz ~ 150MHz)
Accuracy: Time base accuracy ±1 count
Time Base: ±20ppm (23°C ±5°C) after 30 minutes warm up
Resolution: Maximum resolution is 100nHz for 1Hz and 1Hz for 100MHz
Input Impedance: 1MW // 150pF
Sensitivity: £35mVrms (5Hz ~ 100MHz)
£45mVrms (100MHz ~ 150MHz)

Other Details

Power Source: AC 115V/230V ±15%, 50/60Hz
Accessories: Power cord x 1, Instruction manual x 1, Test Lead (type GTL-101) x 2
Dimensions: 251mm (w) x 91mm (h) x 291mm (d)
Weight: 2.2kg approx

Order by Phone or Online

We find that many customers would prefer to call us for help in selecting the best products to suit their needs. Please feel free to contact us by phone or email or use our easy Online Order Form.

Phone: 647-478-6946
Toll Free: 1-800-488-2032
from Canada, US and Territories

Product Profile

Product ID: BF-19
Description: BF-19: Variable Frequency Generator
Notes: This device has not been approved for use on humans in U.S.A or Canada and is therfore to be used only for experimental, hobby or sacramental purposes.