The Model 441AL Frequency-to-voltage Converter produces an analog output that precisely represents the frequency of an applied input signal.

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Calibration And Measurement, Frequency-to-Voltage Converters


The Model 441AL Frequency-to-voltage Converter produces an analog output that precisely represents the frequency of an applied input signal. Adjustable input frequency to output voltage set points allow the user to closely bracket the frequency of interest. The unique crystal-controlled microcontroller design assures fast response, high conversion accuracy, and low output noise that is independent of frequency. The front-panel display shows the input frequency with up to five-digit resolution. All operating parameters are set using the display and the front-panel controls. These settings are retained in non-volatile memory.

The Model 441AL, designed for logic level signals, offers almost instantaneous response for fast acceleration and deceleration systems.

The Model 441AL combines the latest electronic microcontroller technology with surface-mount construction to produce a true breakthrough in frequency-to-voltage products. Indeed, these instruments represent a worthy addition to the Ectron line of 400 Series products that have provided exceptional performance and reliability in rugged applications for the past 25 years.

Designed into this model is rapid response to any change in frequency, low output noise that is independent of input frequency, and input-signal conditioning that automatically provides correct operation for a great variety of input signals, both in wave shape and amplitude.

Gone is the clutter of switches, knobs, pots, etc. associated with other frequency-to-voltage converters. All has been replaced with two easy-to-use, front-panel controls: the display and the encoder knob.

The backlit digital display/push-button has the dual function of display and screen selection. Seven easy-to-use, setup screens, six less frequently used screens, and the operate screen are accessible at the touch of the display.

The encoder, a rotary/push-button control, has the dual function of character selection and change. The user can easily configure the Model 441AL to any specific application desired.

With an input frequency range of 1 Hz to 50 kHz and an output voltage range of –10 V to +10 V, the Model 441AL offers precise frequency-to-voltage conversion for almost any application.

The Digital Periodic Filter virtually eliminates output noise that originates from cyclic variation caused by irregularly spaced wheel cogs or vanes of a flow meter. The user simply sets the filter to the number of pulses per revolution of the device under test and the Digital Periodic Filter stops the periodic variation on the output. Selectable filter settings are from 1 to 999 pulses per revolution.

Because the Model 441AL operates from any dc power from 10.5 V to 32 V, uses the same connector, and has the same pin assignments for signal input, output, and power as all other Ectron 400 Series products, it can be used – even intermixed – with Models 352, 418, T418, 428, 441A, and 451 Amplifier / Conditioners in all standard Ectron enclosures designed for these products.


Ectron 400 Series enclosures provide connector interface for power and signal input and output connections for 400 Series products. Portable, bench mount, rack mount, and signal-conditioning systems are available with capacities from 6 to 22 conditioners. The following Ectron products are interchangeable in these enclosures: the Models 352 and 428 conditioner amplifiers, the Model 441A/AL frequency-to-voltage converter, and the Model 451 LVDT/RVDT signal conditioner. Thermocouple conditioning can be added using the 200 Series T/C Mate.


  • For very fast start-up applications
  • Logic level signals 0 V to 5 V
  • Follows fast frequency changes
  • 1 Hz to 50 kHz Frequency Range
  • Millisecond Response to Frequency Change (for input frequencies over 1 kHz)
  • Adjustable Input Filtering and Sensitivity
  • Front-panel Display of Frequency to 5 Digits
  • Digital Periodic Filter
  • Crystal-controlled Accuracy
  • Precise Control of Output Voltage vs. Input Frequency
  • Miniature size
  • Rugged construction


  • Turbomachine Analysis/Control
  • Drive-line Analysis
  • Fast Response Governor Studies
  • Engine Overspeed Monitor/Controller
  • Accurate Flow Meter Monitoring
  • Precise Tachometer
  • ABS Evaluation
  • Analysis of Synchro Gear Box Problems
  • Clutch Response Evaluation


Models have been supplied with the following characteristics:

  • Conformance to US, Canadian, and European Safety and Hazardous Location regulations
  • Dedicated overspeed monitor applications with RS-232 programmable set points, relay outputs
  • Dual preset set points remotely selectable
  • 4 mA to 20 mA output
  • Frequency averages based on median, mean, or other algorithms
  • Programmable set points
  • Other Specials are available

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