Ya, I'll be damned if I can get it to work and/or connect, Win7 H/P 64b
The "test mode" I speak of is mentioned in the OWON software "Help" section, where it has you put Windows into the "test mode" where it basically takes any set of drivers and runs with it without asking for digital signing or any of that stuff.
At any rate, asks for the drivers, loads the drivers, won't connect, plain and simple. Now...maybe I'm forgetting to turn on something on the 'scope itself, or move a setting. I dunno. Didn't see anything specific in the PDF manual.
Is anyone else's 7102 microphonic? I noticed that tapping the case between the two channel BNC inputs caused channel 1 voltage to move a little, and if I flick the case with a finger nail I can get up to ~200mv damped sinusoidal (ish) waveform.
Is anyone else's 7102 microphonic? I noticed that tapping the case between the two channel BNC inputs caused channel 1 voltage to move a little, and if I flick the case with a finger nail I can get up to ~200mv damped sinusoidal (ish) waveform.
Microphonic Effects
Of much less concern, yet still important, especially
in audio applications, is the microphonic or piezoelectric
effect. Barium titanate which is the base ceramic
material for most dielectric systems will exhibit microphonic
effects. It is not very difficult to take a Y5V
capacitor and put a DC bias with a small signal 1kHz
sine wave and get the capacitor to “sing”. Tantalum
capacitors exhibit no microphonic effects. The experiment
done by AVX involved the opposite phenomena
whereby the part was shaken while under bias and the
resulting generated voltage was measured.
Did you download the Labview package from the Owon site?
One of the folders in this package contains the USB driver. I'm pretty sure that's what I used to install the driver back when I first got the scope.
The PC software packages that I have don't seem to include the USB driver although the instructions for installing it are included.
Is anyone else's 7102 microphonic? I noticed that tapping the case between the two channel BNC inputs caused channel 1 voltage to move a little, and if I flick the case with a finger nail I can get up to ~200mv damped sinusoidal (ish) waveform.
Does this happen with nothing connected to the BNCs?
If you had the probes connected try with nothing connected. It could be a bad connection at the BNC.
It happens with nothing connected, I assumed it would be down to ceramic caps in the front end.
I just powered it up and took the following pics with nothing connected to either input (sorry for phone pics, Owon software doesn't seem to like Windows 8 64 bit).
This is a fairly gentle tap:
And this is a hard flick with a finger nail:
Pk-pk voltages look worse than I originally thought.
I Google'd "labview Owon" and came up with something completely different from "Owon PC software".
Downloaded that. Works now.
Pretty slow updating on the PC though...almost unusable. But good enough for me.
Thanks for the tip ...< ->beer >...
The scope is probably not in warranty. I bought it new, boxed and unused but it was bought by a previous over a year ago and never used. I'm quite happy to take it apart and have a look so I'll let you know if I find anything.
Hi TomC,
came to the decision to bring the 1.9V switcher back to the main PCB because obviously the ADC needs a very low impedance supply. At least now it's clear why they have put this switcher there. The moment the mode switching wants to go from low power to normal mode probably sees a not stiff enough supply and refuses to go over. Thats my problem at the moment that ADC stays in low power mode.
Will put it in a small tin box to fit it in between the keys PCB and the main PCB.
Will take some time especially as I sit here with a swollen cheek and have to see the dentist again after a 4 houres session on tuesday....
And to the microphonic behaviour discussion:
Has any of you thought about the rectangular shields who are soldered just on three points?
If one of them is a bit loose it could make up something like a condenser mic!
The scope is probably not in warranty. I bought it new, boxed and unused but it was bought by a previous over a year ago and never used. I'm quite happy to take it apart and have a look so I'll let you know if I find anything.