Multiplying voltage in a circuit

[tsteele93]

I have a laser power meter that currently outputs voltage in mV but it is (by the design) off by a factor of 3.

For example, if I have a 3 watt laser, it is outputting 1 volt. Or if I have a 600mW laser, it is outputting 200mV.

I use a voltmeter to measure the output and multiply by three in my head.

I would LIKE to multiply my output by three and have the voltmeter display the correct mV to correlate to the laser output in mW.

What would be the best way to achieve this goal?

Should I use a circuit to try and triple the output? Or a resistor to cut the output to the correct numerical value but off by a decimal place?

Any pointers would be greatly appreciated.

Tom Steele

 

[chuckey]

This is a job for an op-amp with a gain of 3.
Frank

 

[tsteele93]

I figured as much, I guess it is time to do some reading.

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Any tips on how to build a circuit that would do this? I'm assuming that just popping an op amp in line with the output isn't gonna do it.

Really dumb question, could you use a transformer to multiply voltage x3?