$1,859.00 $1,766.05
  • PIE 541
  • 3 in stock



  • Frequency Read & Source Functions
  • Accuracy ± 0.005% of range
  • Source and Read
  • Six Ranges 1 count per hour to 20.000Khz
  • Calibrate Totalizer input and outputs from 1 to 99999
  • Count Pulses 1 to 99999
  • LED indicator for gate time
  • Read a wide range of Frequencies and Waveforms
  • Read 50mV to 120V peak
  • Read signals from Flowmeter pickups, Velocity and
  • Motion Detectors
  • Totalizers
  • Source Function: Sine and Square waves, Zero Based and Zero Crossing
  • Frequency from 1CPH to 20 KHz
  • Adjustable amplitude from 100mV to 12Volts peak-to-peak
  • Simulates Vibration Pickups, Variable Speed Drives and more
  • Calibrate Totalizers: Output a number of pulses from 1 to 100 minutes
  • Gate Trigger Indicator: The LED flashes in synch with the output frequency. This allows easy adjustment of the attenuation for proper gate triggering.
  • Full 5 Digit Display
  • True ±0.005% of range accuracy
  • Bar graph for quick reference of trigger level and output levels, 5% of frequency range
  • High contrast graphic display viewable in all lighting conditions and angles
  • Change the speed of dialing your test point by just pushing down on the EZ-Dial Knob
  • Stop watch style push button for accurate totalizer measurements and for high and low readings
  • Uses a standard 9V Alkaline Battery
  • Superior battery life of 24 hours under typical continuous usage
  • Easy access to battery compartment
  • 240 VAC Tolerant
  • Fuse-less protection from accidental misuse
  • Lightweight and rugged with a solid feel
  • Convenient Velcro hand strap allows for a firm confident grip or attachment to pipes and ladders.

This is the recommended replacement for the following Altek Calibrators:

  • Altek 40A Frequency Source
  • Altek 241 Frequency Calibrator
  • Altek 941 Frequency Calibrator
  • Altek 942 Frequency Calibrator


The Practical Instrument Electronics (PIE) 541 is the best tool for calibration, test, and diagnosing turbine meters, frequency counters, vibration systems, tachometers, vortex shedders, integrators, and any other Frequency devices in the shop, plant and/or field. The PIE 541 brings all the features you would expect from a frequency calibrator and timesaving new ones.

The PIE 541 comes with an LED indicator showing gate time for easy trigger level adjustment. Make adjustments with the EZ-Dial Knob or test limits with the dual action EZ-Check Switch. Save hours of troubleshooting time on problems when compared to other calibration methods. When calibrating a totalizer, the PIE 541 eliminates the need of a stop watch. This calibrator will automatically stop when the selected number of pulses has been sent to the totalizer.