BillFitzmaurice.info

Hi
Just bought a new meter, old one form before the turn of the century died. Was checking my voltage limit on my DCX to amp for subs. 49volt was my target.
When I set the tone 60hz the limit light on the DCX came on at 27 volts approx. and would climb as the fader was pushed and stop climbing at the target voltage.

Is my meter bad, is the DCX bad. Has anyone else experienced this issue. Is my tone wrong, too low?

This might seem like a stupid question but, is the meter set to AC volts?

Yup. I have tired to think is there something I have miss set in the DCX, Could my choice of Slope affect this in any way. I believe I'm high passing at 50 , is that to close to the tone I'm using to set it up.

When measuring a sine wave I don't think it matters if you have True RMS voltage or not.

another thought , what is the proper release time on the limiter, probably unrelated to this issue.

I observed a similar thing on Radians dcx unit he informed me that it is somewhat of a known issue with those units especially when running aes signal. We had the clip light often lit last weekend but were only mid green light on the meter. May have to hook up your multi meter to output of dcx and identify actual clip that way before ringing out your amp!

T_Gowan wrote: ↑Wed May 01, 2019 8:47 am I believe I'm high passing at 50 , is that to close to the tone I'm using to set it up.

That would be the issue, too close and already on the curve and the higher freq are already engaged in the limiter.

Anyways why 50hz? IIRC The t24 and T39 are good to 45 hz. A lot of modern Dance/hiphop lives right at 50-55hz, you would be missing out.

I guess just for safety a little lower voltage and a little higher high pass. I'll have to try the change in test tone freq. Will report back. Probably not till the weekend now though.

Again after thought, because this is a tone and not wider frequency source would there be other frequency ie higher frequency affecting the limiter.

Again what limiter release settings are others using in the DCX, should it be really short , medium , I would think not long.

T_Gowan wrote: ↑Wed May 01, 2019 1:07 pm Again after thought, because this is a tone and not wider frequency source would there be other frequency ie higher frequency affecting the limiter.

Again what limiter release settings are others using in the DCX, should it be really short , medium , I would think not long.

That's right, you are using a tone. There shouldn't be any higher frequencies coming through unless the source or the dcx input are clipping.

I've never experienced the limiter light coming on too soon before on the DCX. I no longer have it so I can't experiment with it.

I've always ran the release as fast as possible - 20ms. IMO, no need to keep the signal supressed after offending peak is gone. If I was letting someone else use the system then perhaps longer to let the driver cool down a bit, it would sound funny though, you would get a pumping sound.

Did you have a long release? Maybe that is why the light was on yet the voltage was low, maybe it kicked in and hadn't turned off yet.

Cant recall what the release is, its the default value I believe. I'm still wondering if this is a meter issue. My settings are the same and it worked with my old meter.
This working for a living interferes with the things I want to get done LOL