Thanks for that, doing that install now, I had a newer version installed, but for trouble shooting I will install that versionThe one from the Cosmos ADC's product page: https://e1dashz.wixsite.com/index/cosmos-adc
That's normal. The iAP interface is some kind of workaround from Comtrue for Huawei devices and has nothing to do with the Cosmos ADC's operation.
It can safely be ignored.
Sorry I was replying as you typed your initial post and hadn’t refreshed the pageAgain: everyone will see an iAP interface with a yellow exclamation mark in their Device Manager, regardless of which driver is used for the Cosmos ADC.
It is fully expected.
Bouncing is basically guaranteed using the Rectangular window and still likely using Flat top (depends on motherboard and USB cable quality IME).Done and installled, just tested and still getting ‘bouncing’
So not expected or good with Blackman Harris 4 or 7 then… any other ideas welcomeBouncing is basically guaranteed using the Rectangular window and still likely using Flat top (depends on motherboard and USB cable quality IME).
All other windows should be stable.
Yeah I've had that happen once using a Ryzen Thinkpad, though annoyingly it just sorted itself out at some point.So not expected or good with Blackman Harris 4 or 7 then… any other ideas welcome
It does this with two completely different pcs
Lenovo yoga core i5
Hp which is a intel slow thing that’s 8yrs old
Regardless of pc I can’t take a stepped sine measurement without it jumping up before it gets to 250hz
It’s not so bad when you’re taking 1khz sine measurements for harmonics as you can let it run with 32 averages and hit save when it settles
Yeah I've had that happen once using a Ryzen Thinkpad, though annoyingly it just sorted itself out at some point.
At the time, my sweeps came out looking like this:
View attachment 346356
Could you try running LatencyMon on both of your systems?
That might tell us something about the potential culprit behind this instability.
Googling wdf01000.sys brings up lots of forum posts describing latency and audio dropouts.
What Autoranger are you referring to?Is the Cosmos Scaler an equivalent (+$$$) replacement for the Autoranger?
No problem, I use usual resistor dividers, both SE and balanced configuration, at low impedance (not to add resistor noise), like 1k / 100R and appropriate switch setting on E1DA.
View attachment 211407
The SE divider + 2.7V EDA setting adds 13x attenuation, so the max. input is 35.1V. Simple math, you can make it as you like.
SE divider looks like this
View attachment 211408
The Dispre 2 - JFET preamp was measured directly, without a divider, in a setup as below:
View attachment 211409
R1/R2 should be 5 so 1k and 200 ohm should be OK but beware it will change by downing the setting because of the COSMOS input impedance, for 1.7Vrms the divider will be 6.6 because R2 will be in // with 640ohm input impedance.So if I want to make a se divider like yours what values of resistors should be used to get roughly 5x the attenuation? So on the 10v setting I can use 50v input which is plenty for what I want to be measuring
I presume it has some reference in the equation to current and also voltage drop through the circuit