How to measure electrical frequency?

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SUMMARY

The discussion focuses on measuring electrical frequency and converting it to voltage using the LM2917 chip from National Semiconductor. It emphasizes the need for electronic frequency, which varies over time, to achieve accurate conversions. Various transducers, including magnetic pickups, are mentioned as effective tools for obtaining electronic frequencies from mechanical sources. The conversation also touches on the use of Schmitt triggers in the design process, although there is some debate regarding their effectiveness in sensing frequency.

PREREQUISITES
  • Understanding of frequency-to-voltage conversion using LM2917
  • Knowledge of transducers, specifically magnetic pickups
  • Familiarity with Schmitt triggers and their applications
  • Basic concepts of electrical and mechanical frequency
NEXT STEPS
  • Research the specifications and applications of the LM2917 chip
  • Explore different types of transducers for frequency conversion
  • Learn about the functionality and design considerations of Schmitt triggers
  • Investigate methods for converting electrical frequency to mechanical frequency (RPM)
USEFUL FOR

Electrical engineers, automation professionals, and anyone involved in frequency measurement and conversion in electronic systems.

killjoy_scofiel
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in f to V converter, input is frequencies . Is that electrical or Mechanical frequency?
 
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To convert a frequency to a voltage, you need an electronic frequency (voltage varying in time).
One can use different types of transducers to get an electronic frequency from a mechanical one.
National makes a chip, LM2917, just for this application. Check out http://www.national.com/mpf/LM/LM2917.html" where you can see the transducer (magnetic pick up).
 
Last edited by a moderator:
sensor transduces electrical frequencies?
how to convert this frequency to mechanical frequency(RPM),,,
i ve seen a design before, they use scmitt's trigger before f to V converter

generator--->trafo---->scmitt's---->LM2917---->PLC---->inTouchwonderware

i think schmitts don't sense the frequency...(no magnetic pick up)?

LM2917 only detect positive peak of sinusoidal wave?
http://www.imagehosting.com/out.php/i1447796_all.jpg
 
Last edited:

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