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Old 3rd November 2010, 01:21 PM   #1
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Default Bench Multimeter for Mic Preamp design

Any recommendation how many digits of resolution (4.5, 5.5, 6.5 etc.) and sensitivity (1mV, 100V, 1V etc.) is needed for mic preamp design?
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Old 6th November 2010, 05:33 PM   #2
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Off-hand, the theoretical noise floor of a microphone is at -139dBu. But what really is it you want to measure?

http://rupertneve.com/company/notes/...nce-and-noise/
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Old 9th November 2010, 06:09 AM   #3
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I want to measure microphone (dynamic & condenser type) output level, audio signal and DC bias of a mic preamp.
I'm choosing between Agilent U3402A 5 1/2 digit Dual Display at $600 and Agilent 34401A 6 1/2 digit at $1,072.
Agilent Technologies Test Equipment - U3402A - Multimeters - Bench - Allied Electronics
Agilent Technologies Test Equipment - 34401A - Multimeters - Bench - Allied Electronics
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Old 11th November 2010, 09:26 AM   #4
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I heard that many of the U-series equipment are rebranded products from asia. So you may want to take that into consideration.

The HP 34401a is blue blood Agilent and has been the standard for a long time. You can't go wrong with it if you can afford it.

A used HP 3457 is far cheaper and its performance is in the same class of HP 34401a.
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Old 25th March 2011, 06:48 AM   #5
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A better option is 34410A since you can datalog to computer via USB interface but expensive by $200 compared to 34401A.
34401A is equipped with GPIB and RS-232 thus need to have a GPIB or RS-232 to USB adapter to interface to a PC.
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Old 25th March 2011, 07:42 AM   #6
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I think an oscilloscope will be far more useful in (pre)amp design than a multimeter...

Greetings,
Andreas
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Old 25th March 2011, 08:49 AM   #7
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Quote:
Originally Posted by Rundmaus View Post
I think an oscilloscope will be far more useful in (pre)amp design than a multimeter...

Greetings,
Andreas
Agreed!

Get a used Tek 7000 series with a differential plug-in. you can then measure uV on top of a lot of common mode offset and noise.

DMM will read nonsence here and you'll have no choice but believe it!
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Old 25th March 2011, 09:28 AM   #8
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I already have a Tek TDS2012B scope. Right now I'm using a Fluke 179 (6,000 count) multimeter, will this suffice?
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Old 25th March 2011, 01:10 PM   #9
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Quote:
Originally Posted by Ronnie4416 View Post
I already have a Tek TDS2012B scope. Right now I'm using a Fluke 179 (6,000 count) multimeter, will this suffice?
That is not much use for low level measurements! 2mV/cm max sensitivity and very high bandwidth.

As previously asked - what do you want to measure?
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Old 26th March 2011, 12:54 PM   #10
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Re: "Right now I'm using a Fluke 179"
this is OK for AC voltages in power circuits but only has a specified AC Voltage bandwidth up to 500Hz - so not much good for Audio....
Fluke spec sheet: http://assets.fluke.com/datasheets/2155a.pdf

Let us know what you want to measure and further assistance can be given, as said before!
Mik

Last edited by audiomik; 26th March 2011 at 12:58 PM. Reason: add request for more information
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