All About Circuits - Newsgroup Archive Forum Index All About Circuits - Newsgroup Archive
These forums contain an archive of usenet posts relating to electronics. These usenet posts are a great resource. Click the 'search' link to search for a topic, or browse through the posts.
 
Back To: please note - you cannot post on these forums. this is a usenet archive, new posts are not permitted. please visit our forums to create a new post
   SearchSearch 
black star multimeter 3225

 
   All About Circuits - Newsgroup Archive Forum Index -> sci.electronics.equipment


Author Message
g.knott
Guest





PostPosted: Wed Oct 10, 2007 8:57 pm    Post subject: black star multimeter 3225

Does anyone know how to calibrate this? Made in the UK.
Back to top
Jamie
Guest





PostPosted: Thu Oct 11, 2007 6:00 am    Post subject: Re: black star multimeter 3225

g.knott wrote:

Quote:
Does anyone know how to calibrate this? Made in the UK.
First you sit down and eat your tea and crumpets.

then you complain about the price of petrol.
then you complain about the Americans. ( that is if you
are a Brit to start with). and after all of that.
if you still have interest in calibrating that meter.
You could then start looking at the manual.
personally, I don't thing the meter should nerd
calibrating. If so, and you're looking for very high
accuracy? I don't think you should be doing it.

Over here in good old USA. a Simpson 260 Analog
meter is considered a standard. Or at least, it once
was. ( I have one btw, in very good condition)



--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
Back to top
g.knott
Guest





PostPosted: Thu Oct 11, 2007 9:45 pm    Post subject: Re: black star multimeter 3225

Jamie wrote:
Quote:
g.knott wrote:

Does anyone know how to calibrate this? Made in the UK.
First you sit down and eat your tea and crumpets.
then you complain about the price of petrol.
then you complain about the Americans. ( that is if you
are a Brit to start with). and after all of that.
if you still have interest in calibrating that meter.
You could then start looking at the manual.
personally, I don't thing the meter should nerd
calibrating. If so, and you're looking for very high
accuracy? I don't think you should be doing it.

Over here in good old USA. a Simpson 260 Analog
meter is considered a standard. Or at least, it once
was. ( I have one btw, in very good condition)



Ah another helpful American Wink


The point is that I have a class of students that must calibrate a piece
of electronic equipment according to the manufacturer's instructions.
We have lots of these meters and since they are battery driven they are
safe to dismantle.
I was hoping someone has done this.
Back to top
Robert Baer
Guest





PostPosted: Fri Oct 12, 2007 5:05 am    Post subject: Re: black star multimeter 3225

g.knott wrote:

Quote:
Jamie wrote:

g.knott wrote:

Does anyone know how to calibrate this? Made in the UK.

First you sit down and eat your tea and crumpets.
then you complain about the price of petrol.
then you complain about the Americans. ( that is if you
are a Brit to start with). and after all of that.
if you still have interest in calibrating that meter.
You could then start looking at the manual.
personally, I don't thing the meter should nerd
calibrating. If so, and you're looking for very high
accuracy? I don't think you should be doing it.

Over here in good old USA. a Simpson 260 Analog
meter is considered a standard. Or at least, it once
was. ( I have one btw, in very good condition)



Ah another helpful American ;-)

The point is that I have a class of students that must calibrate a piece
of electronic equipment according to the manufacturer's instructions.
We have lots of these meters and since they are battery driven they are
safe to dismantle.
I was hoping someone has done this.
Well, if you really want to "calibrate a piece of electronic

equipment according to the manufacturer's instructions" thenyou need to
get those instructions.
And since you are referring to a mass production unit, any
calibrating (pot tweaking) done at the factory is done according to
*internal* methods and thus is !proprietaty! and will not be disclosed.
So, the best you can do in this case is "calibrate a piece of
electronic equipment according to best (to be determined) efforts".
Take one apart and tweak only one pot at a time, say by only one
screwdriver blade-width, and check all scales to find what changed.
This way, each adjustment can be labelled "capacitance zero",
"resistance", "voltage", "unknown".
*RESET* the tweak when done.
Use a digital camera for a closeup and label the photo (use arrows to
pots) accordingly; print copies along with a suggested procedure that
you determine.
You can use 0.1% resistors and 2% capacitors as "standards", along
with an off-the shelf precision voltage regulator.
Current measurements are never adjustable; they depend on the
internal shunt accuracy and voltage measurement accuracy.
Back to top
Jamie
Guest





PostPosted: Fri Oct 12, 2007 6:28 am    Post subject: Re: black star multimeter 3225

g.knott wrote:

Quote:
Jamie wrote:

g.knott wrote:

Does anyone know how to calibrate this? Made in the UK.

First you sit down and eat your tea and crumpets.
then you complain about the price of petrol.
then you complain about the Americans. ( that is if you
are a Brit to start with). and after all of that.
if you still have interest in calibrating that meter.
You could then start looking at the manual.
personally, I don't thing the meter should nerd
calibrating. If so, and you're looking for very high
accuracy? I don't think you should be doing it.

Over here in good old USA. a Simpson 260 Analog
meter is considered a standard. Or at least, it once
was. ( I have one btw, in very good condition)



Ah another helpful American ;-)

The point is that I have a class of students that must calibrate a piece
of electronic equipment according to the manufacturer's instructions.
We have lots of these meters and since they are battery driven they are
safe to dismantle.
I was hoping someone has done this.
Ok, well, I do remember (years ago no when I was a kid), a fresh carbon

cell was to output something like 1.56xxx , I can't remember exactly.
but that was the calibrator. Now days, I really don't think they do that
any more.Smile
Sorry I couldn't of been any more help to you.


--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
Back to top
g.knott
Guest





PostPosted: Fri Oct 12, 2007 7:51 pm    Post subject: Re: black star multimeter 3225

Jamie wrote:
Quote:
g.knott wrote:

Jamie wrote:

g.knott wrote:

Does anyone know how to calibrate this? Made in the UK.

First you sit down and eat your tea and crumpets.
then you complain about the price of petrol.
then you complain about the Americans. ( that is if you
are a Brit to start with). and after all of that.
if you still have interest in calibrating that meter.
You could then start looking at the manual.
personally, I don't thing the meter should nerd
calibrating. If so, and you're looking for very high
accuracy? I don't think you should be doing it.

Over here in good old USA. a Simpson 260 Analog
meter is considered a standard. Or at least, it once
was. ( I have one btw, in very good condition)



Ah another helpful American ;-)

The point is that I have a class of students that must calibrate a
piece of electronic equipment according to the manufacturer's
instructions.
We have lots of these meters and since they are battery driven they
are safe to dismantle.
I was hoping someone has done this.
Ok, well, I do remember (years ago no when I was a kid), a fresh carbon
cell was to output something like 1.56xxx , I can't remember exactly.
but that was the calibrator. Now days, I really don't think they do that
any more.Smile
Sorry I couldn't of been any more help to you.


Thanks.
Back to top
Robert Baer
Guest





PostPosted: Sat Oct 13, 2007 12:02 pm    Post subject: Re: black star multimeter 3225

Jamie wrote:

Quote:
g.knott wrote:

Jamie wrote:

g.knott wrote:

Does anyone know how to calibrate this? Made in the UK.


First you sit down and eat your tea and crumpets.
then you complain about the price of petrol.
then you complain about the Americans. ( that is if you
are a Brit to start with). and after all of that.
if you still have interest in calibrating that meter.
You could then start looking at the manual.
personally, I don't thing the meter should nerd
calibrating. If so, and you're looking for very high
accuracy? I don't think you should be doing it.

Over here in good old USA. a Simpson 260 Analog
meter is considered a standard. Or at least, it once
was. ( I have one btw, in very good condition)



Ah another helpful American ;-)

The point is that I have a class of students that must calibrate a
piece of electronic equipment according to the manufacturer's
instructions.
We have lots of these meters and since they are battery driven they
are safe to dismantle.
I was hoping someone has done this.

Ok, well, I do remember (years ago no when I was a kid), a fresh carbon
cell was to output something like 1.56xxx , I can't remember exactly.
but that was the calibrator. Now days, I really don't think they do that
any more.Smile
Sorry I couldn't of been any more help to you.


No, no, no!

Mercury cells were good enough to use as a secondary standard when
calibrated, and if not, new ones wer good to 5 digits (if i remember
correctly - been ages).
Back to top
Display posts from previous:   
   All About Circuits - Newsgroup Archive Forum Index -> sci.electronics.equipment All times are GMT
Page 1 of 1

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


sitemap