Is this transformer ringing bad?

[AUDIO FREQ]

Hello I injected a 600hz Square Wave. Measuring with my oscilloscope, Tamura ga80071 transformer inside the Presonus Eureka. I am getting this weird square wave look on my new siglent 1104x-e.

 

[cyrano]

I think you'll always get that kind of "ringing" if you send a square wave into a transformer...

Depending on the level, of course. So, at what level was the square wave?

 

[warpie]

The level is displayed. Less than 1Vrms.

For starters switch the probes to x10

 

[AUDIO FREQ]

The level is displayed. Less than 1Vrms.

For starters switch the probes to x10

Isn’t 1x best for 600 ohms and lower? Just what I read on the web. I’m a noob

 

[CJ]

Input or output xfmr?

Ratio?

I bet input, maybe 1:4 with that ring, is all circuitry removed from PRI and sec?

Put scope on SIG gen output to see if it is holding its own without ringing,

Check at 1 kc, 10kc and 100 kc and maybe 1 mc for kicks,

Check for peaks and valleys above 20 kc,

 

[AUDIO FREQ]

Input or output xfmr?

Ratio?

I bet input, maybe 1:4 with that ring, is all circuitry removed from PRI and sec?

Put scope on SIG gen output to see if it is holding its own without ringing,

Check at 1 kc, 10kc and 100 kc and maybe 1 mc for kicks,

Check for peaks and valleys above 20 kc,

Hi CJ it is a Mic Input Transformer by Tamura.
Ive read it is 600:3000, so wouldn't that be 1:5?

I got the transformer from a friend, who took it out of a Yamaha PM-1000. Here is the schematic of that input.

I am using my computer headphone out as a signal generator, and Logic Pro test oscillator square wave (anti aliasing on), as a signal generator. It only goes to 20,000 hz.

Should I just get one of these?

 

[CJ]

1:2.2 ratio for 600 to 3000
Root 5

We have one of those laying around somewhere, people gut the strips for racking up much pres

No need to buy a generator, just use your ears to see his it sounds,

https://groupdiy.com/threads/yamaha-pm1000.66305/

 

[Brian Roth]

@AUDIO FREQ ...are you measuring the transformer in some sort of circuit (preamp???....whatever) or just sitting by itself on the test bench? If the latter, perhaps it would require some sort of loading on the secondary for proper performance.

"Loading" might be a resistor or a Zobel.

Bri

 

[warpie]

Isn’t 1x best for 600 ohms and lower? Just what I read on the web. I’m a noob

I had the impression it always has to be x10 but I might be wrong. Maybe someone can chime in and clear this up..

 

[ruffrecords]

If it is a mic input transformer then it is probably designed for best performance when driven from a 150 ohm source. Drive it from a much lower source impedance (like a headphone amp) and it will certainly ring. Try repeating the experiment with a 150 ohm resistor in series with the primary.

Cheers

Ian