• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 37 subscribers
  • Views 2112 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Tina-TI 9.1.30.94 "Digital Multimeter" doesn't measure AC generated from wave files - is this normal?

Ken Whitley
Prodigy 40 points
Other Parts Discussed in Thread: TINA-TI

My circuit at this point consists of a Voltage Generator and a Volt Meter.

If I use the generator to produce a sine wave, it appears in both the Volt Meter and Oscilloscope as an AC signal.

If I use the generator to play a wave file of a sine wave, it appears in the scope, but measures 0VAC with the meter.

The same thing happens if I use a wave file of another waveform, or of pink noise.  The scope works but the meter doesn't.

In addition, if I select Analysis/AC Analysis/Table of AC Results, I get a table consisting of all zeroes.

 

  • 0
    TI__Mastermind 41310 points

    Ken,

    Could you provide your example .tsc file?

    Britt Brooks

  • 0 in reply to Britt Brooks - Online Design Tools
    Prodigy 40 points

    5148.WavefileTest.tsc.zip

    I hope zip files are okay.  I included the .tsc and the two wave files I used.  One is one second of pink noise (16 bit, 44.1k), the other is a single cycle of a 100Hz ramp (also 16 bit. 44.1k).

    I suppose it's remotely possible the wave files are somehow defective, but they work fine in the scope, and the preview button plays them as well.

    When I next get to working on it, I may try inserting an RMS-DC converter IC into the circuit and see if that produces a reasonable output.

     

    What I am doing in the big picture is trying to set the gain of a fairly large number of audio filters to deliver equal power output when driven by the same shaped noise signal, by driving the filters with the noise signal.

    My other alternative is to dump the math for all the filters into a symbolic algebra program and integrate them all.  Were they all cleanly designed filters, where I had the math before the circuit, this would be the easier approach, but they are RC and RLC messes mostly designed by ear, some with inductors whose imperfections matter to the sound.  As a tech, obviously I'd prefer the multimeter.

  • 0 in reply to Ken Whitley
    TI__Expert 5515 points

    Ken,

    In general signals in WAV files are not periodic. Therefore analyzing circuits with wave file excitation needs transient analysis and in TINA-TI the result of this can be displayed on an oscilloscope or waveform viewer diagram only. In the Industrial version of TINA, voltmeters can show the momentary value during interactive transient analysis, but this is the same value which is displayed when you run a cursor in a diagram or oscilloscope. Interactive analysis is not supported in TINA-TI.
    If you need an average (e.g.RMS) value of the result of a transient analysis, it can be calculated for a selected curve in the diagram window through the Process/Averages menu.