[Laser] Newport 820 power meter

[J. Forster]

The pots just set the meter sensitivity at specific wavelengths and compensate
for the spectral characteristics of the detector. It's nothing more than a
current meter, perhaps with a bias supply. Readjust at will.
-John

Andrew T. Flowers, K0SM wrote:

> I just picked up an old Newport 820 power meter, without the probe.  I
> have some 1cm^2 Silicon photodiodes with BNC connectors that I'd like to
> use as detectors.  It looks as if I can recallibrate the meter with the
> pots on the bottom of the unit.  There are three slots, one each for
> 632.8,  514.5, and 488.0nm.  Does anyone know if I might be able to
> recallibrate the switch to work with different wavelengths?  Ideally I
> would like to calibrate it for 780, 670 and 630nm.  Of course, I planned
> on using my calculator to figure the output at other wavelengths based
> on the responsivity of the PD, but since the pots are there that may not
> even be necessary.
>
> Any ideas?  I'm hopeing this thing will help me keep from blowing up
> diodes when I'm setting the bias.
>
> Andy K0SM/2
>