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Old 04-30-2012, 08:34 PM #1
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Default DC1999.9mA Digital Pannel meter

ok so This may be the wrong place to post but if it is then please move it.

so long story short im making a bench laser driver and want to incorporate a Digital ammeter in it.

I needed one that could go up to 2 amp but precision enough to read ad low as just a few Milli-amp (for 5mW diodes) so the solution buy a 1999.9mA pannel meter.
My problem is the only place I can get one is direct from XIELI (china ) for $15 and $30 shipping. so

My question is if i were to buy 2 or 3 of them would anyone be interested in buying one from me to help me cover shipping.

I have the money for up to 4 of them and would buy and receive them before anyone sent me the money for theirs.

They take 9 volts AC but Im getting mine custom fitted for 5v DC

here is a link to a site selling them in bulk for a picture reference.
19999 4 1/2 digit panel meter products, buy 19999 4 1/2 digit panel meter products from alibaba.com

also I'm referring to the XL4215 model which on that page has a typo its actually 1999.9mA not 1.9999

I have already talked to the Sales Manager and am looking to order soon so please let me know


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Old 05-03-2012, 08:40 PM #2
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Default Re: DC1999.9mA Digital Pannel meter

BUMP anyone even remotely interested
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Old 05-03-2012, 11:37 PM #3
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Default Re: DC1999.9mA Digital Pannel meter

Couldn't you just get a cheap 3 1/2 panel meter and use 2 different shunt resistors?
1 for low current and 1 for high current with a switch go change between them.

you can get 3 1/2 meters in the USA for under 10 bucks


EDIT:
If you get the right shunt resistor, this would work with only 1 shunt resistor
http://www.ebay.com/itm/4-1-2-Red-LE...item518df868fd
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Old 05-04-2012, 12:59 AM #4
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Default Re: DC1999.9mA Digital Pannel meter

??? I Dont understand how changing the shunt will give me a lower current reading.
I know that its reading the current buy measuring the voltage drop across the resistor.

But how do I calculate which resistor value to use and would it still be accurate.
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Old 05-04-2012, 01:47 AM #5
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Default Re: DC1999.9mA Digital Pannel meter

The meter I linked to says it needs a 75mVolt shut resistor for 20A
That means the shunt would have a 3.7mOhm resistance
Since you want to go from 20A to 2A you would want 37mOhm resistor

Then you would need to resolder a jumper on the back of the board to move to decimal.

I haven't tried this myself, so you might want to get a "2nd opinion" before buying it.
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