martin Not sure yet. It looks like it has two connectors. Maybe holding/taping them at our audio cable would work. But I found hints at German forums that an additional amplifying circuit may be needed:
https://www.mikrocontroller.net/topic/417617 English translation
https://www.prad.de/board/thread/50411
English translation (bottom of page 1)
KM Might be. @TechSensitive , could you shed some light on this? Just a photo of how your setup maybe looks like with a small explanation how the photodiode is attached, would help a lot.
martin I got the oscilloscope today. It has a "crocodile" and a hook connector:
Short impressions so far:
- The output is more accurate than (my) sound card oscilloscope. One can actually see the "zero" axis and judge how big the difference in amplitudes is. Plus the waves resemble reality much better.
- The Hz counter of the OpenHantek software is worse than the sound card scope. It seems to count only very obvious sinus waves. I.e. when the PWM almost touches the x-axis. Not sure yet how to change that.
Hello, i'm using a similar setup with the Hantek 6022BL and a OPT101 (https://www.ebay.com/itm/232458733138).
This chip includes a photodiode with a transimpedance amplifier which greatly simplifies the schematic needed:
For the software i would suggest the great PcScope made by Fabio1963 (https://www.dropbox.com/sh/qieod71ucovd6we/AADJvoBmMZNcR0kFB8ysS7vSa?dl=0).
Amazing. Could you test some of the newer iphones, in case they give you eyestrain as well? Im gonna do that on my work iphone where I have absolutely terrible and long lasting pain.
Yes the software looks crap compared to Zeitnitz. Also we might need to get a better photodiode just to be sure. I was recommended this - https://www.conrad.cz/pin-fotodioda-osram-components-bpx-61-to-39-vyz-uhel-55-400-1100-nm.k153122
@Wootever please what is the difference when you use the diode with the circuit as bought from ebay?
martin
The transimpedance amplifier converts current from the photodiode to a voltage usable by the oscilloscope (it basically amplify the signal for a more stable output).
The advantage of a combined/embedded design:
The integrated combination of photodiode and transimpedance amplifier on a single chip eliminates the problems commonly encountered in discrete designs, such as leakage current errors, noise pick-up, and gain peaking as a result of stray capacitance.
For Android there's an app called "HScope". It supports various Hantek devices, including the 6022BE. My first impression is that it's great software. It detects frequencies much better than OpenHantek does and generally seems very polished. We might be able to create a portable solution with an Android device, a USB On-The-Go cable, a power bank, 6022BE + probe, and the HScope app.
HScope App: https://play.google.com/store/apps/details?id=com.martinloren.hscope
Guide: http://hscope.martinloren.com
JTL Hantek says up to 48MS/s. The HScope guide says 48Ms/s are supported by the app: http://hscope.martinloren.com/oscilloscope-tables.html
martin No more than 240 Hz yet. I find the soundcard solution to be much more responsive. It even picks up my ceiling's 100 Hz incandescent flicker from afar while the Hantek oscilloscope receives a flat line. Maybe the photodiode needs an additional external voltage. The audio cable somehow might supply that voltage.
