bootleg2go said:
[quote author=electron link=1223589264/40#48 date=1223745725]Well their meter wasn't hard to find based on their video, it's a Viasho Laser Power Meter (VLP-2000).
Just so happens one of our members on here sells them, but I don't think he stocks them though; and he uses a Coherent himself. Optotronics is a Viasho Retailer in the USA for the famous RPL's which I just happen to have 2 of from Jack :
Hey Jack, using Susie's method of measuring did you know the RPL's you sell put out 2.5 WATTS of Power.
I guess the price of the RPL's is really going to jump sky high now. ;D ;D ;D ;D ;D ;D
Jack, chime in if your reading this; I'm going to need to get in-touch with you this coming Monday.
Hi Joe,
I have some experience with the VLP-2000 meter, I recently got one in on special order for a customer.
The VLP-2000 has a nice thermal head on it, so it reports the sum of all wavelengths just like both yours and my Coherent meters.
If anything, it's very likely that the meter they use could not be accurate as they do not go through a formal calibration or are traced back to a calibrated standard.
It's also very easy to change what the meter is really reading. They have a calibration pot inside that is easy turn and could be adjusted to report higher than real results, so the video tells nothing really except for the fact that someone made a video of the VLP-2000 in action. Oh, it does tell me something else....That the person taking these measurement doesn't know what they're doing.
1. They are holding a thremal head in their hand??? The heat from their body will transfer to the head and increase the output reading.
2. They are holding the laser directly against the head. This kind of forms a seal (not air tight), but prohibits air from floing freely and any heat built up by the laser onto the sensor is held inside this small space and that too increases the heat and the reading as well.
On a side note, the meter I got in I compared with my Coherent Fieldmaster GS and LM-3 head. I did comparisons with 473nm and 532nm lab system that were very stable and at output levels from 2mW up to 140mW and in all cases the VLP-2000 reported values that were 6-8% higher than my Coherent meter reported.
I adjusted that internal pot to set the meter calibration and after that it was pretty much right on with the Coherent across both 473 and 532nm wavelenths at various output levels (within 1 percent).
What was kind of bizarre was that I contacted the manufacturer and told them of this was the reply I got, which could have lost something in the translation one way or the other; but in effect I was told what I understood to be was that USA miliwatts are a little less than China milliwatts???
I always thought a milliwatt was a milliwatt???
Anyway, I didn't push the subject as it could have been a misunderstanding in the translation and it didn't really matter as I had calibrated to my own meter.
Jack[/quote]
You will also notice that as she's holding said sensor that the output is registering 0. so taking into account the reading is going to be zeroed to include the heat of her hand of course it's going to be off. WAY OFF.
Oh and chinese mW are higher? The chinese always think they are better than everyone. So why shouldn't thier mW be higher than everyone else? Pffft.
