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Old 30th November 2012, 08:21 AM   #1
samlo is offline samlo  India
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Question output level of dvd playre?

HI ALL EXPERTS, i have recorded 1 khz tone signal on cd using nero and tone generator software. during playback[on pc] sgnal is showing 100 % [0db] level
now i want to use this cd in my dvd player as a source signal for amps[ for
repairing purpose] but problem is that, i dont know the output level of my dvd player. i dont have any oscilloscope. so is there any idea to measure output level ? thanks in advance,sorry for bad english.
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Old 30th November 2012, 09:38 AM   #2
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An audio frequency (1kHz in this case) capable voltmeter is what you need. Most DVMs can do this (though their accuracies may vary), which should be adequate for repairs. But I'm not an expert.
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Old 30th November 2012, 09:49 AM   #3
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I'd guess that most CD / DVD players output 2V RMS @ 0dB.
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Old 30th November 2012, 12:30 PM   #4
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I'd like to know what <$200 DVM will read 25 mvac on music. The Sears 82140 won't do it and and Sears 82028 won't do it either. They work okay at 60 hz, only. The fluke factory meter won't, either. Three years I've been asking this question on organforum, the answer is so obvious nobody bothers to type it in. I use a Simpson 266 VOM with a 2 VAC scale, but their products were deemed so useless they went bankrupt in the eighties.
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Old 30th November 2012, 03:34 PM   #5
Davey is offline Davey  United States
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I've had a Simpson 260 for over forty years.

Most of the cheaper DMM's will not read AC voltage (reliably) above 1khz. You'd have to check the specifications closely to find a $200 DMM meter that might fit the bill.

I think if you measured the output level of a dozen different CD/DVD players, you'd probably find the average about 2.2VRMS.

Cheers,

Dave.
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Old 1st December 2012, 12:19 AM   #6
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Most DVD players have very good frequency response. So if you record a 60 Hz tone at the same volume level, you could measure this tone with almost any meter and have a reasonable answer.
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Old 1st December 2012, 04:58 AM   #7
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Quote:
Originally Posted by indianajo View Post
I'd like to know what <$200 DVM will read 25 mvac on music. The Sears 82140 won't do it and and Sears 82028 won't do it either. They work okay at 60 hz, only. The fluke factory meter won't, either. Three years I've been asking this question on organforum, the answer is so obvious nobody bothers to type it in. I use a Simpson 266 VOM with a 2 VAC scale, but their products were deemed so useless they went bankrupt in the eighties.
What's a Fluke factory meter? I use Fluke 8060A meters (own 2) and have been calibrating audio levels with them for 25+ years. You've heard my audio and seen my video work on commercial DVDs and network TV. The Fluke meter is flat to 100 KHz and in dB mode can read to just under +8 dB resolving to 0.01 dB. My target is to get within 0.05 dB or less. Now that we're in the digital world this is becoming moot.

G
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Old 3rd December 2012, 01:10 PM   #8
samlo is offline samlo  India
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Hi to all, many thanks for your responses. i checked line out of pc with headphone then i checked o/p of dvd player with same headphone .i think output level of my dvd player is aprox. 50 % than pc. now,i am thinking to convert line o/p signal [100 Hz tone] to DC,using diode bridge and proper capacitor. if o/p level is 1V rms then rectified DC will show
1.41 V, which is accurately readable on DMM. do u think this trick is possible? if yes, which
is best diode, capacitor to use?
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Old 3rd December 2012, 01:41 PM   #9
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It's possible in principle, as it's how meters work anyway. If you DIY make sure you consider the rectifier voltage drop. Using an AC test tone suitable for your voltmeter will likely give the best accuracy. 100Hz should be fine for your DMM.
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