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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Posted: Thu Aug 08, 2019 9:25 pm
by Joe Malone
wave wrote:Hello,
I've put one of these together for a client and I'm trying to calibrate. Is there a procedure for calibration using a standard function generator?
Preferably one that I can count LEDs to align with as I don't have the purpose made JLM meter scale.
Also, I'm not understanding how to jumper the unit so the LEDs are in full brightness mode all the time. I can apply a jumper to position 1 and get the 2.5V dimming or I can remove it and I get the dim then brighter with level behavior.

Thanks!
Dave


For full brightness fit jumper in header which will link pin to 0v for full brightness.

Put in 1khz tone and turn input trimpot RV1 up until you have just lit the 40th red led. Then turn up VUPPM balance trimpot RV2 until the 40th green led just lights. Cal between VU and PPM is not done. Adjust input trimpot to maximum input level for your system.

Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Posted: Fri Aug 09, 2019 1:16 am
by wave
Hi Joe,
Thanks for the reply. I'm still confused. Which pin(s) do I jump? Also, I'm assuming I feed 1.228VAC from the generator and I have done that but it seems that normal program just slams the meters full. There are 4 banks of 10 leds so the 40th is the very last LED on the unit, correct? Some pics would aid tremendously.

Thanks,!

Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Posted: Sat Aug 10, 2019 2:29 am
by wave
I really need some further guidance. I am just not seeing how to jump for full brightness. Can someone please elaborate?

Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Posted: Mon Aug 12, 2019 11:27 am
by Joe Malone
wave wrote:I really need some further guidance. I am just not seeing how to jump for full brightness. Can someone please elaborate?


Fit shunt jumper to first position of header as shown on attachment