Originally Posted by Jeroen1000 @SS and ConnecTEDDD
Following this with great attention but it looks you may be overthinking this with regards to the i1 pro 2 (no disrespect at all intented).
I'm assuming you at least use a notebook with USB2.0 ports?
The power requirements of an i1 pro 2 are much lower than what USB2.0 can deliver (let alone what USB3.0 can deliver). I can deduct this from the fact it only requires a usb 1.1 interface according to the specification sheet. For people with a Jeti concrerned with power issues, check the power requirement. Not all USB ports can deliver what they should according to the specifications and some ports on laptops share their power:
USB 1.0 - - - 150 mA 5 V 0.75 W
USB 2.0 - - - 500 mA 5 V 2.5 W
USB 3.0 - - - 900 mA 5 V 4.5 W
Post 58 by Ted (hope you don't mind the abbreviation) shows to me that the cable does not matter? You seem to think it does? All figures seem to be well with the repeatibility of the i1 pro 2.
Another thing is that most USB-ports are limited to 500mV output and other USB-devices connected to the computer or USB-hub are affecting the power-quality. External USB-Harddisks without own powersupply are affecting the computers internal powersupply and all other USB-ports negative.
For USB Cables, another degrading fact is that the noisy powerlines are affecting the two USB-datalines. Because non of the power- or datalines are shielded. A better conductor/shielding cable can improve the performance.
Sources of disturbances (ripple & noise) inside a computer:
1. Backlight of computer monitors: The necessary high voltage of approx. 900 V for LCD/TFT monitors is generated by inverters which produce ripple and noise.
2. Hard disks (internal + external): The actuators of the recording/reading heads produce interference voltage with each positioning or stop move.
3. Clock generators and chips like e.g. the CPU, northbridge, RAM or graphics adapter cause disturbances and noise.
4. Power supplies of notebooks and desktop PCs are not designed for lowest interference voltage and noise, since this is extra costs...
I have runned a similar test before some years, using i1PRO1, the results were similar with my i1PRO2 results.... better performance...but the changes are beyond our perception....X-Rite i1PRO USB Cable Performance Test
Ted's LightSpace CMS Calibration Disk Free Version for Free Calibration Software: LightSpace DPS + CalMAN ColorChecker
S/W: LightSpace CMS, SpaceMan ICC, SpaceMatch DCM, CalMAN 5, CalMAN RGB, ChromaPure, CalPC, ControlCAL
Meters: JETI Specbos 1211, Klein K-10A, i1PRO2, i1PRO, SpectraCAL C6, i1D3, C5