| Products > Test Equipment |
| User feedback on KC901S+ and KC901V handheld network analysers |
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| Electrical Science:
I've made a little repair video about KC901v. |
| Mechatrommer:
--- Quote from: Electrical Science on October 27, 2020, 09:15:48 pm ---I've made a little repair video about KC901v. --- End quote --- i dont watch all of the video, its too long, i only skipped to important part. but congratulation on your fix. i think this is exactly what happened to my KC901V a while a go. i sent my unit back to China for repair at a cost of DHL courier shipping and they sent me back the unit fixed at their cost. i snapped photos of pcb before repair and when something happen again i will open it up and i should be able to see which part they were replacing.. i suspected on some gain amplifier but i dont want to risk buying the wrong part (LMC788A is a $10 IC not cheap) and wasting time, it was still under warranty with only few weeks left. otoh, if you havent updated the KC901V firmware, i suggest you do so by downloading from their website (make sure it is for KC901V not KC901S, you can screw your VNA if wrong FW) since new FW will include both fringing capacitance and fringing inductance parameters into CALibration process, something that was not available even in Holy HP/Agilent or FieldFox VNA, it may not matter much but well, its always better to have than not (i usually left them 0s anyway, until i make further study on this later). we the bbs forum members were raising and pushing the issue and luckily they listened, i give them thumbs up for this but unfortunately the bbs forum was closed down, this is a thumbs down. but in the end, i'm still happy with my KC901V even though many challenges i've gone through with this. edit: and i forgot to tell, there is one level deeper menu to recalibrate internal frequency sweep on those port by pressing some combination keys while in normal menu interface (read the manual its there i cant remember now). before this internal calibration (before fix) i can set 0dBm on GUI, but actually very low output, when i recalibrate, then i only can set like -20dBm max iirc on GUI, so i guess the sweep calibration process is using actual output level detection. and then actual output match that is set in GUI. after factory fixing, i guess they do the internal recalibration and my frequency sweep can be set to 0 to 10dBm again, cheers. |
| W4HBM:
Gentlemen, Regarding the DEEPACE KC901s+ Vector Network Analyzer..... The situation here is the VNA is to be used under 200 MHz, Never taken to the field, cradled in a wooden fixture on the bench, not connected to a computer via USB or Ethernet, not used in the Remote Status. The current FW update level is v1.2.3...... IMPORTANT: Never Drop The Meter More Than A few Inches (<3). If you do, send it back to the factory. (v1.2.8 & v1.2.9 do not seem worth all the effort and time just yet, but INQUIRY HEREIN as to whether v1.2.8 is important ( !! ) The RF Trainer module is mounted on a wooden frame, held with small globs of Butyl Rubber to afford electrical & physical isolation. R E P O R T: 1) If handled very carefully and allowed to warm up judiciously, the '901s+ remains stable. :) 2) The Battery Charge active Icon is somewhat misleading. e.g., What are the "planets" circling the colored "sun?" 3) Do the "planets" indicate how many battery units are installed within? 4) Disassembling the analyzer chassis is not for the faint-of-heart. I cannot imagine what sort of hammer to use..... 5) The detailed Info screen is somewhat difficult to navigate, and then when landing on the parameter, what then? 6) Oftentimes, using a high-quality test lead and SOL set, it seems the Factory Cal is better than the DUT rig. 7) Gathering a high-quality test lead set altogether an important requirement. Any fudging yields Chaos. |
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