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Help with DMM gain setting

 
  #1  
Old 01-20-2018, 12:40 PM
Cheesehead_13
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Default Help with DMM gain setting

Ok, never did this before and having a tough time, but looking for guidance. Aquatics HU, JL 280/4 bridged in stereo, DDAW's. Trying to set gains with DMM.
  • Amp out FR- taped to black lead on DMM
  • Amp out FL+ taped to red lead on DMM
  • DMM set to ACV
  • Volume on HU set to 30/40
  • 1000 hz test tone downloaded from sticky at top of forum
  • Power on, test tone playing: max voltage showing is 15.4 volts. I believe bridged should be 23.7v per the installation guide.
Any ideas wtf I am doing wrong? It's driving me nuts. There is no way that it should be .5x23.7=11.8v per side is there?

Thanks in advance.
 
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Old 01-20-2018, 12:51 PM
Tailwind
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Input voltage switches.

T
 
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Old 01-20-2018, 12:54 PM
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Originally Posted by Tailwind View Post
Input voltage switches.

T
on DMM?
 
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Old 01-20-2018, 12:58 PM
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Originally Posted by Cheesehead_13
on DMM?
Amp

T
 
  #5  
Old 01-20-2018, 01:04 PM
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Originally Posted by Tailwind View Post
Amp

T
currently on low. Should I set to high? Do i leave it on high once gains are set?
 
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Old 01-20-2018, 01:11 PM
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Originally Posted by Cheesehead_13
currently on low. Should I set to high? Do i leave it on high once gains are set?
Typically in low but depends on your wiring setup. Turn gains all the way down and see what impact it has in high v low.

Also make sure ur DMM is reading VAC.

T
 
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Old 01-20-2018, 01:23 PM
Tailwind
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Are u wired 4 channel bridged? Switch at 4 channel input?
Gator clips on correct wires?

T
 
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Old 01-20-2018, 02:09 PM
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Originally Posted by Tailwind View Post
Are u wired 4 channel bridged? Switch at 4 channel input?
Gator clips on correct wires?

T
Low voltage input, 4 channel (bridged in stereo),filter at 80hz, filter mode hp
DMM taped to wires from amp
DMM set to VAC (ACV)
 
  #9  
Old 01-20-2018, 02:10 PM
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Originally Posted by Tailwind View Post
Typically in low but depends on your wiring setup. Turn gains all the way down and see what impact it has in high v low.

Also make sure ur DMM is reading VAC.

T
no difference high vs low input
 
  #10  
Old 01-20-2018, 02:48 PM
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No difference with bike running or not running. I have no idea what's up.
 

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