What Are Your Experiences and Suggestions for Lock-in Amplifiers?

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Discussion Overview

The discussion centers around user experiences and suggestions regarding lock-in amplifiers, including their applications, problems encountered, and potential improvements. The scope includes technical discussions and personal experiences related to the use of these instruments in research settings.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses willingness to share experiences but questions the framing of the initial inquiry, suggesting that lock-in amplifiers are often the only viable option for certain measurements.
  • Another participant shares historical experiences with phase locked loops (PLLs) and references a specific book that was influential in their understanding of analog signal communications.
  • The same participant notes the evolution of technology, mentioning that newer and more complex integrated circuits are available compared to those used in the past.
  • A mentor in the forum clarifies the guidelines for the thread, indicating that while survey-type threads are typically not allowed, this one may proceed as long as it remains technical.

Areas of Agreement / Disagreement

There is no clear consensus among participants regarding the framing of the initial questions, with some questioning their relevance while others share personal experiences. The discussion remains open-ended with multiple perspectives presented.

Contextual Notes

Some assumptions about the necessity and exclusivity of lock-in amplifiers in certain measurements are not fully explored. The discussion also touches on the evolution of technology without resolving the implications of these advancements.

Hugo_Researcher
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Dear Physics Forums,

For a research we are conducting, we're seeking some input from users of a Lock-in Amplifier.

If you use a Lock-in Amplifier, could you provide me with a few answers to the following questions?
  • What's your overall experience with lock-in amplifiers?
  • Have you encountered any problems when working the lock-in amplifiers?
  • What would you like to get improved on current lock-in amplifiers?
  • What lock-in amplifiers did you use?
Thank you in advance! I would like to start a good discussion with all of you!

Kind regards,

Hugo
University of Twente
 
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I frequently use lock-in amplifiers and I'd be happy to help.
However, I am not sure the questions really make sense; they sort-of imply that there is a sensitive alternative to using a lock-in amplifier whereas in most of the situations they are used it is the only (sensible) type of instrument you could use for that type of measurement, it is rare for there to be an alternative to using a lock-in.
To see what I mean just imagine asking the same questions about say voltmeters.

One can of course discuss pros/cons of different models (or even say analog lock-ins vs. DSP based ones) but that doesn't seem to be what you are asking:smile:
 
I used phase locked loops for some analog signal communications decades ago.

This book was the "Bible" back then.
https://archive.org/details/bitsavers_signeticsdcsPLLApplications_5800304

I learned the basics with NE565 PLL and 567 tone decoder. I was able to FM modulate telephone DTMF signals onto inaudible ~25khz carriers and send them all over a power plant via the PA system without affecting its use for voice communication..

There are much newer and more complex IC's available now.

Good luck with your investigations. PLL's are a LOT of fun.
 
Welcome to the PF, @Hugo_Researcher

We normally do not allow survey/interview-type threads. But as long as this thread is confined to the technical discussion of lock-in amplifiers (and no personal information is requested), it may be okay. The Mentors will monitor the thread going forward. Thank you.
 

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