Diode voltage and amperage measurement setup

[andrelcg]

Hello everyone,

I'm new in the hobby and would like to take some questions!

I did a setup with a regulated source, a red laser module, two multimeters and LPM. The diode is  16x LG DVD burner.

I use a multimeter to check voltage and the other I use to check the amperage.

I would to now the measurement uncertainty of the procedure?

And if you have a better way to measure the amperage in the diode ?
I took some pictures to better illustrate the procedure.

Thanks for your attention!

A big hug,
Andre Garcia

 

[andrelcg]

more pic

 

[andrelcg]

...and LPM (Benm Laser Power Gauge)...great project!!!

 

[rog8811]

The only thing I would change is to put a 1 Ohm resistor into the circuit so that you can measure the mv drop across it (1mv+1ma), it avoids accidental breaking of the circuit if a probe wire comes off.

Regards rog8811
Nice setup you have there by the way

 

[andrelcg]

Nice idea rog8811!!! Thanks a lot!

I will put the resistor in my board! Two watts is ok?

With this way I can get more resolucion in my measurement! My multimeter is very cheap, and I can`t get good resolution and accuracy when I read up to 200mA.

Hug..Andre Garcia

 

[Benm]

I see you made a nice box for the power gauge

For current measurement, i think the 1 ohm shunt is preferable to connecting the ampere meter in circuit, though it will drop slightly more voltage than the internal 10A shunt. For optimum results you could use a 0.1 ohm resistor instead, though you'd have to multiply readings by 10.

I usually use 1 ohm as well, it's only a problem when you are working with battery powered drivers that are already on their absolute lower limit of tolerable voltage drop.

 

[andrelcg]

I see you made a nice box for the power gauge

My only problem are the batteries. I can't find a way to keep them!! I just use DX rare magnets!

Other question...Can I use the 1N4007 instead 1N4001? I have many peaces here!!

A hug,
Andre Garcia

 

[lasersbee]

The 1N4001 Diodes are rated at 1Amp @ 50Volts
and the 1N4007 Diodes are rated at 1Amp @1000Volts

As long as your circuit uses less than the a Diode's rated Amperage
and Voltage... you can use it...

Jerry

 

[andrelcg]

The 1N4001 Diodes are rated at 1Amp @ 50Volts
and the 1N4007 Diodes are rated at 1Amp @1000Volts

As long as your circuit uses less than the a Diode's rated Amperage
and Voltage... you can use it...

Jerry

Thanks Jerry!

 

[Benm]

The voltage drop may be a lilttle bit diffrent though. Not as bad as with shottky diodes with different rated voltages, but it could be minutely larger for the higher rated 1n400x series as well.

 

[andrelcg]

Anybody knows this red laser module?


New Wish Red Laser Module mod. R-400-1
I'm not sure about this potenciometers... I believe that one is to adjust the sensitivity and the other is to adjust the gain (voltage/amperage)!

I can adjust other parameters?

 

[andrelcg]

...and what the big difference using this module and use the diy modules or Microdrive, for example?

thanks for your help!

Hug,
Andre Garcia