Milliamp and micro amp reading differ

Thread Starter

Robesim

Joined May 1, 2017
144
When you pay a lot of money for an instrument you expect to get proper performance.
Because there is so much competition out there I don't believe in spending a lot of money on a DMM.

Take a look at this EXTECH MN15A or MN16A.

http://www.extech.com/resources/MN15A_MN16A_DS-en.pdf

http://www.computronics.sr/accessories/toolkits-meters.html
You're right. I don't want to spend a lot of money on multimeters. I can better spend it on parts. Thanks for the multimeter suggestions. Computronics is in my country. I will look into these and if i have more questions i will post them.
 
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Thread Starter

Robesim

Joined May 1, 2017
144
Why doesn't your meter work on ma current range?
The meter does not have a dedicated mA setting on the dial. If i put the red lead in the 10 amp fuse port and set the dial on DC amps i can read from one mA and above. 2 ma it reads like 0,002 A. So it does not read values lower than 1 mA. For those values i need to go to the uA setting on the dial. And for high uA values, let's say 200 uA, the meter is not accurate.
 

Thread Starter

Robesim

Joined May 1, 2017
144
Are you taking all measurements with the meter at the same range setting?
The internal resistance is likely to be different at every range setting.

You have calculated that the internal resistance is 2.3kΩ.
That would be considered high.

My meter shows:
1kΩ at 200μA range
100Ω at 2mA
10Ω at 20mA
1Ω at 200mA
What meter do you have??
 

Thread Starter

Robesim

Joined May 1, 2017
144
When you pay a lot of money for an instrument you expect to get proper performance.
Because there is so much competition out there I don't believe in spending a lot of money on a DMM.

Take a look at this EXTECH MN15A or MN16A.

http://www.extech.com/resources/MN15A_MN16A_DS-en.pdf

http://www.computronics.sr/accessories/toolkits-meters.html
Many many many many thanks!!!!!!!!!!!!!!!. Bought the Extech MN16A today for $46 and the meter is fairly accurate.

Powersupply voltage: 1,001 volt
Resistor 4.7k
Calculated current 0.21 mA. Measured 0,21 mA
Calculated current 210 uA Measured 208 uA

Other measurements: Resistance, voltage etc are spot on.

Results of my $180 meter
voltage 1,001 volt
Resistor 4.7k
Calculated current 210 uA measured current 143 uA

This is a better meter than the $100 and $180 meter i have. The fluke can stay where it is. The meter is best for electronics bench work. Not for field work because it is not sturdy. Whole meter is plastic. Treat it well and it will last i think. Planning on getting another one. Thanks again.
 
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