Hello Joe,
I just received your wonderful VUPPM 500 Meter, thank you very much !
I have tried to calibrate the VUPPM as describe :
Send in 1k tone at 0dFS or +18dBu to 500 Input for left and Output for right.
Set mode to VUPPM mode RED PPM with GREEN VU over the top.
Adjust Left and Right level trimpots so left and right 40th red led just light.
Adjust Left and Right VU/PPM trimpots so left and right green led just light. (40th led may make yellow depending on peak mode)
I have no problem to adjust the Left and Right input trimpots !
But Left and Right VU/PPM have no response. Anything is changing when I turn both of this trimpots.
I verified the VUPPM mode (PPM in red, VU in green)
I can't find where I'm wrong !
Do you have an idea ?
Best regards
Arnaud VIALA
VUPPM 500 Meter Calibration ?
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- Joe Malone
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Re: VUPPM 500 Meter Calibration ?
HI ArnaudArnow wrote:Hello Joe,
I just received your wonderful VUPPM 500 Meter, thank you very much !
I have tried to calibrate the VUPPM as describe :
Send in 1k tone at 0dFS or +18dBu to 500 Input for left and Output for right.
Set mode to VUPPM mode RED PPM with GREEN VU over the top.
Adjust Left and Right level trimpots so left and right 40th red led just light.
Adjust Left and Right VU/PPM trimpots so left and right green led just light. (40th led may make yellow depending on peak mode)
I have no problem to adjust the Left and Right input trimpots !
But Left and Right VU/PPM have no response. Anything is changing when I turn both of this trimpots.
I verified the VUPPM mode (PPM in red, VU in green)
I can't find where I'm wrong !
Do you have an idea ?
Best regards
Arnaud VIALA
I just checked your order and you bought a built and tested VUPPM500 meter so it is calibrated already. If you want to change input level you only should ever adjust the Input Left and Right trimpots as the VU/PPM balance is already set so should not be changed. If you have moved the 25 turn VU/PPM balance trimpots then turn them down several turns until the green VU level is a few leds less than the PPM red level. Adjust your PPM level so the top red led just lights then turn the VU/PPM BAL trim up until the 40th Green led just lights for both channels. Once balance it set is doesn't need to be adjusted again. You can change input level without having to redo the balance.
Joe
JLM Audio
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Re: VUPPM 500 Meter Calibration ?
Hello Joe,
Oh ! Then I have decalibrate my new VUPPM
I'm not in my studio this week so I can't recalibrate it now but when I try the first time, my problem was that the VU/PPM trimpots had no action.
(The green VU level didn't move)
Is it possible ?
I will try again ASAP and tell you !
Thank you for your answer !
Best regards
Arnaud VIALA
Oh ! Then I have decalibrate my new VUPPM
I'm not in my studio this week so I can't recalibrate it now but when I try the first time, my problem was that the VU/PPM trimpots had no action.
(The green VU level didn't move)
Is it possible ?
I will try again ASAP and tell you !
Thank you for your answer !
Best regards
Arnaud VIALA
- Joe Malone
- Site Admin
- Posts: 2160
- Joined: Wed Jan 24, 2007 11:35 pm
- Location: Brisbane, Australia
- Contact:
Re: VUPPM 500 Meter Calibration ?
We would not have been able to calibrate it if the trimpots didn’t work. They are 25 full turn trim pots so take a lot of turns to adjust so you probably haven’t moved the alignment out by much. Use a 1khz tone to do the alignment.Arnow wrote:Hello Joe,
Oh ! Then I have decalibrate my new VUPPM
I'm not in my studio this week so I can't recalibrate it now but when I try the first time, my problem was that the VU/PPM trimpots had no action.
(The green VU level didn't move)
Is it possible ?
I will try again ASAP and tell you !
Thank you for your answer !
Best regards
Arnaud VIALA
Joe
JLM Audio
Capturing Audio without Injury
JLM Audio
Capturing Audio without Injury
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- Posts: 1
- Joined: Fri Sep 18, 2020 1:42 am
Re: VUPPM 500 Meter Calibration ?
Hello...D9 is discretionary to raise the limit level. You can utilize an arrangement series of diodes and zeners to have switchable limit levels.
Ordinarily you would simply short the limit sticks together to empower the comp .
Increase pot for best control on front board use is a 10k fire up log pot.
On the off chance that utilizing for talkback you will be astonished at how set and overlook it tends to be and work with consistent yield regardless of what information level.
pcb quote
Ordinarily you would simply short the limit sticks together to empower the comp .
Increase pot for best control on front board use is a 10k fire up log pot.
On the off chance that utilizing for talkback you will be astonished at how set and overlook it tends to be and work with consistent yield regardless of what information level.
pcb quote
Last edited by LoriNagle on Sat Oct 10, 2020 2:35 am, edited 1 time in total.
- Joe Malone
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Re: VUPPM 500 Meter Calibration ?
HI LoriNagle I think you meant to post this on the talkback comp build thread?? Let me know and I will move it.LoriNagle wrote: ↑Sat Sep 19, 2020 1:31 amHello...D9 is discretionary to raise the limit level. You can utilize an arrangement series of diodes and zeners to have switchable limit levels.
Ordinarily you would simply short the limit sticks together to empower the comp .
Increase pot for best control on front board use is a 10k fire up log pot.
On the off chance that utilizing for talkback you will be astonished at how set and overlook it tends to be and work with consistent yield regardless of what information level.
Joe
JLM Audio
Capturing Audio without Injury
JLM Audio
Capturing Audio without Injury