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

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

Post 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.
Joe :-)
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wave
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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Post 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,!

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

Post by wave »

I really need some further guidance. I am just not seeing how to jump for full brightness. Can someone please elaborate?

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

Post 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
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Joe :-)
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fragletrollet
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Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Post by fragletrollet »

Pondering on using this in a mastering console I'm planning. I would have use of monitoring loud signals and would need a scale that's shifted upwards. My main converters are calibrated to the same as my monitoring DA ('+22dBu), but I also use a H8000 for final master 2track AD conversion that has +26dBu headroom on it's inputs. So as to both monitor my various converters but also the analog gear inserted into the mastering switcher it's going to be housed in, I'd like to monitor levels in that area, preferably a little above (the 8K sounds great clipping it's ad). How high can it go?

:wink:

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

Post by Joe Malone »

fragletrollet wrote:
Mon Nov 01, 2021 3:51 pm
Pondering on using this in a mastering console I'm planning. I would have use of monitoring loud signals and would need a scale that's shifted upwards. My main converters are calibrated to the same as my monitoring DA ('+22dBu), but I also use a H8000 for final master 2track AD conversion that has +26dBu headroom on it's inputs. So as to both monitor my various converters but also the analog gear inserted into the mastering switcher it's going to be housed in, I'd like to monitor levels in that area, preferably a little above (the 8K sounds great clipping it's ad). How high can it go?

:wink:
The input trim is passive in front of the active circuit so can handle any level from high powered amp outputs etc. I have setup pairs for mastering as high as +32dBu but they can handle more and adding series resistors with the inputs can help keep the input trim in its fine adjustment zone. I would look at using the more modern stereo VUPPM compact or VUPPM500 on our website as it can do several metering options and we could run some custom scales if needed for a few dollars more.
Joe :-)
JLM Audio
Capturing Audio without Injury

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

Post by fragletrollet »

Very nice, I'll look into the updated version :wink:

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