- May 25, 2013
are these still available for $100?
Hobbyist meters (TEC based) often don't have an accuracy spec associated with them because of the longer response time.It looks like a good deal to me. The only thing I did notice was that there's no information on here or the website which lists an accuracy spec for the unit.(e.g +-5%) Do these meters undergo some accuracy/calibration testing before shipping, or are they just shipped as is? Sorry if this has been answered already
Understood. I love the graph that was posted by Trevor, very valuable info there. I'll try and reword the question more accurately. Would it be alright to expect a hobbyist TEC meter such as the X4 to have +- 5% accuracy when measuring a stable diode output after the sensor has warmed up?(after 45+ seconds) I know when using lasers with widely variable power outputs TECs are almost useless for an accurate reading, but can you expect an accurate +- 5% reading with a stable output laser after sensor lag is taken into account with units such as the X4? That was really my question, it just took a lot of typing to ask properly. Only asking because of Paul's post about it reading 88% under his laserbee( I guess he actually meant 12% under)Hobbyist meters (TEC based) often don't have an accuracy spec associated with them because of the longer response time.
and this post specifically
Thanks for clarifying that. Is there any chance you made measurements of your 1.6w 445 on both of the LPMs? How do they compare at that power range?kaunak, ARG is right. Even though my build is battery powered it uses a great deal of heat sinking and is fan cooled as well, so it is more stable than a pointer. But, when taken into account the fluctuations of the DPSSLs I came to accept the reading of the Radiant as close enough even though my graph with the DPSSL was for 180 seconds and increased during the entire test. That is the response of TEC based LPMs. It is close enough for me to make a reasonable conclusion about the power of the laser. In the higher power single diode lasers you will not see this difference. I hope this was helpful to you. I'd still buy it and I am still happy with it. To get the kind of accuracy you're talking about you will have to spend much more $$$. Good luck, Paul
In the product descriptionmine came into today! Did i miss where it says it doesn't come with the necessary USB chord?
Makes sense really. Short USB cables are a pain to use with desktops, and long USB cables are a pain to use with laptops. Customer can choose the length of the USB cable they want.NOTE: The case is optional and sold separately. A USB-B cable is required for operation.