Need a milli-voltmeter

inteificio · 1st June 2006, 07:05 AM

Hi I have been advised to check the Bias on my amp.

I need a millivolt meter than can help me set the bias to 7mV

Does anyone know where I can buy/rent/borrow one (I live in York England)

How precise do I need to get the BIAS? 7mv, 7.0mv 7.00mv etc etc

peranders · 1st June 2006, 07:20 AM

mV units, like 6, 7, 8 mV. It's not critical. You can use a simple DMM with 200 mV range and 1999 in reading.

AndrewT · 1st June 2006, 08:01 AM

Hi,
you can buy a DMM for £2 upwards.

You do not need great accuracy, the DMM is likely to be better than +-1% on the DC scales, this is good enough.

You may want to invest in a meter that has a wide range of scales, which are still available cheaply, look at the AC, DC, ohms, scales and see what ranges are available to fit your budget.

If you take up electronics then you might want transistor hFE and capacitance and frequency. I would buy a second or even dedicated meter to carry out these extra functions.

inteificio · 1st June 2006, 12:15 PM

Hi,

admitting ignorance here. What is a DMM, where do you get it, and does it work like a volt meter?

Thanks

inteificio · 1st June 2006, 12:19 PM

just had a thought. does DMM = Digital Multi meter?

if so, where can you get one for £2?

peranders · 1st June 2006, 12:21 PM

You can also go here:
http://acronymfinder.com/af-query.as...d&string=exact

AndrewT · 1st June 2006, 04:49 PM

Hi,
I bought a buy one get one free (bogof) for £5 at Maplin recently and donated them to my school. They were surprising good and fabulous value.
There are other special offers available.

ghg · 8th June 2006, 12:08 PM

Peter, this one ought to be enough:

http://www.maplin.co.uk/Module.aspx?...meters&doy=8m6

inteificio · 8th June 2006, 05:06 PM

Yay found one.

digital home tester from maplins.
It does almost everything the DMM's do (and is more accurate). but they named it differently so when you searched DMM you wouldn't find it cos its only £7!

maplins are bastards sometimes.

but i got it and it works great.

1st June 2006, 07:05 AM	#1
inteificio diyAudio Member Join Date: Dec 2004 Location: York	Need a milli-voltmeter Hi I have been advised to check the Bias on my amp. I need a millivolt meter than can help me set the bias to 7mV Does anyone know where I can buy/rent/borrow one (I live in York England) How precise do I need to get the BIAS? 7mv, 7.0mv 7.00mv etc etc

1st June 2006, 07:20 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	mV units, like 6, 7, 8 mV. It's not critical. You can use a simple DMM with 200 mV range and 1999 in reading. __________________ /Per-Anders (my first name) or P-A as my friends call me

1st June 2006, 08:01 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, you can buy a DMM for £2 upwards. You do not need great accuracy, the DMM is likely to be better than +-1% on the DC scales, this is good enough. You may want to invest in a meter that has a wide range of scales, which are still available cheaply, look at the AC, DC, ohms, scales and see what ranges are available to fit your budget. If you take up electronics then you might want transistor hFE and capacitance and frequency. I would buy a second or even dedicated meter to carry out these extra functions. __________________ regards Andrew T.

1st June 2006, 12:21 PM	#6
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	You can also go here: http://acronymfinder.com/af-query.as...d&string=exact __________________ /Per-Anders (my first name) or P-A as my friends call me

1st June 2006, 04:49 PM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, I bought a buy one get one free (bogof) for £5 at Maplin recently and donated them to my school. They were surprising good and fabulous value. There are other special offers available. __________________ regards Andrew T.


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1st June 2006, 12:15 PM	#4
inteificio diyAudio Member Join Date: Dec 2004 Location: York	Hi, admitting ignorance here. What is a DMM, where do you get it, and does it work like a volt meter? Thanks

1st June 2006, 12:19 PM	#5
inteificio diyAudio Member Join Date: Dec 2004 Location: York	just had a thought. does DMM = Digital Multi meter? if so, where can you get one for £2?

8th June 2006, 12:08 PM	#8
ghg diyAudio Member Join Date: Apr 2002 Location: Vienna	Peter, this one ought to be enough: http://www.maplin.co.uk/Module.aspx?...meters&doy=8m6

8th June 2006, 05:06 PM	#9
inteificio diyAudio Member Join Date: Dec 2004 Location: York	Yay found one. digital home tester from maplins. It does almost everything the DMM's do (and is more accurate). but they named it differently so when you searched DMM you wouldn't find it cos its only £7! maplins are bastards sometimes. but i got it and it works great.

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