Hi Kerry, nice and informative review! Do you happen to know the lowest and highest frequency of the built in frequency generator? I want to use it for audio amplifier analyses and lowest frequency below 20 Hz would be nice and highest above 40 kHz would be nice. Kind regards from Germany! Burkhard
The signal generator (sine wave from the app) goes down to 50 Hz , and up to 344 kHz. But if you go to the Output menu, you actually can get it down to 10 Hz but you only have the discrete values 10Hz, 50 Hz, etc.
Yea this one. is the one I got. Electric motorcycle/bicycle battery is either 72Vn ( 100V covers this without OL)... 96s DCV is another good nominal ( 120VDC cover this without Over Limit) ... very common. I will be comparing it to a 16 bit 32s pair of Revo DPL8s PL chargers on .xls logging 10 hz. It shows five digits after the zero on teh ACIR logs. Decimal accuracy of the DPL8s calibration is to +/- 1mA Measurement accuracy: Voltage resolution: 78uV (16 bit) Voltage tolerance: +/- 6mV
@@KerryWongBlog Do you know any good pants-pocket-size battery scope that has variable persistence mode? I'm after catching LED communication signal glitches (e.g. FW1906, WS2811, etc.) in the data line. My TEK scope is just too heavy, especially with an external battery.
The PC board probes are pretty clever. I see they have the signal lead surrounded by shield traces. I wonder if they have an active guard as might be found on a high end meter? Over all this looks like a lot of function for the price and it looks surprisingly well made. My wishes would be to have a higher excitation voltage available and a higher test frequency at 100 KHz.
Thorough as usual Kerry. Mine arrived with an extra pair of tweezer tips as well. Nice gadget. Much better to use than the wired tweezers for my handheld lcr meter.
The firmware upgrade v1.7 adds a data log, appended each time hold is pressed. Have a go at it 😊. Thanks for the in circuit demo and high resolution view of the internals. Your description of the diode function should help a lot of your viewers understand why it’s not so good at diodes. Zotek spelled incorrectly in the title.
You can update the firmware, check out my video on the firmware update procedure here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QCB1xFN_ryI.html
Professor Wong, question. You mentioned the meter graphic does not keep up with the digital count. Will it keep up with aligning a circuit such as when aligning for finding a voltage peak while slowly adjusting a slug in an RF or IF can or an audio stage? Some lag time is acceptable since these adjustments are done slowly; your thoughts Sir. I really enjoy and value your lectures as part of my ever ongoing opportunities to expand my knowledge. A 4-year E.E degree, 1970's, basically means one is capable of and must learn more; it never ends !!
The distance from the guard traces to the resistor chains for protection is in some places rather small. So I would be careful with higher voltages, like 230 V mains.
Thank you for this teardown. I am surprised at how crappy this PSU is, in spite of it's nice presentation. I expect some noise but 1-2% WOW!, plus the instability in CC mode etc.
That is so annoying, I assumed the knobs were ten turn or similar, not this select a digit GARBAGE!!!!!!!!! I was going to get this supply, but NO WAY NOW!!!!!!!!!!!!!!!!!!!!
To be fair, most of the PS nowadays are using encoders for voltage/current adjustment and even on some lab grade PS like the UNI-T one I just reviewed recently it uses a similar design.
I did some comparisons of DC load current internal resistance "quick test" from a Opus BC-3400 - vs. - AC measurement of this unit. The several dozen 18650's were at various states of lifecycle and fully charged a day before the test. What I found is the Opus DC test method did a better job at correlating between internal resistance and loss of capacity, which I previously tested and marked on each cell. On the other hand, the FNIRSI AC test method was superior measuring reporting physical construction: High quality cells were always lower than poor quality cells, with very minor difference between the lowest and highest residual capacity. All readings from the FNIRSI were lower by about 3X but did not correlate directly with the Opus IR quick test. Therefore, I would assume the DC pulse method better detects on-current voltage depression due to chemical aging, due to it's higher calculated resistance using the formula you mentioned. This is probably not real resistance, but the inability of the chemistry to keep up with demand. In the end, I would consider the HRM-10 a useful tool for checking the construction of newer cells such and cell matching for new battery packs. However, it does not feature a test method good for resolving the state of health of a declining cell. A device measuring total capacity by completing a full charge-discharge cycle is always best for that. Secondarily, the DC method to extract apparent resistance under load would is better for measuring aging than the AC method the FNIRSI (and others) use. I found a battery university article 802a that says the same general thing and presents figure 2 showing similar data to my findings.
I'm not sure the meter actually has a nH/pF resolution. the 0.001nH/pF might just me a result of numerical calculation. That doesn't mean the meter can actually measure a theoretical 1nH/1pF element. At 40KHz, a 10nH inductor would drop 2.5mV even at 1A current.
@@KerryWongBlog im asking if the device's negative input lead is at mains ground potential like most of oscilloscopes are. The device is mains powered so there's a difference to battery powered multimeter, unless there is a small isolation transformer inside the device to power it or something like that
@@za_ozero Unlike oscilloscopes, bench multimeter's inputs are all isolated. The multimeter common input can be floated to +-500Vpp on this meter according to the spec and labeling on the front panel.
Thank you for the video. I really prefer those king of PS with more intuitive setup i.e, knobs for voltage and current limits. Changing current limits and else on a bench PS in device menus is not intuitive for me, and requires more actions other then troubleshooting other devices. Looks like a good PS though. Thx
I just realized in the name VX4 the V is for Visible and X is for Mixer. So basically V means it has a display and X means it's able to charge any combination of chemistry. The C in VC I think means USB-C but this one is also USB-C so not sure. It was hard for me to decipher which of their chargers was the best since they have so many competing models and it isn't immediately obvious. Is it safe to say this is their latest best charger for 4 batteries? Just ordered off Amazon with 8 AA and 8 AAA 1.5v LiIon batteries and have a drawer full of older 1.2V Amazon Basics. Only thing I wish it also had was a tab for 9 volt battery charging.
:-) I like my SONY Alpha 6000 camera, it doesn't have a microphone jack unfortunately. I am going to stop using my wireless mic and use the builtin mic instead, maybe I will switch to use my phone to do the recording in the future...
HI, if BMS after destruction of FETs ignite H2, C2H2, CHZ4, C2H6 and other gases from LFP battery, what happens ? Small exúplosion? If battery is in non ventilated compartment ? Big explosion ? How many litres of H2 produces this LFP battery after thermal runaway due to internal short circuit after dendrite growth due to charging at low temps ?
I bought this charge controller for the purpose of installing it in my boat to keep my batteries topped off with the solar panel. As soon as I received that I realized it’s not really an MPPT controller, I could tell by its weight. For it to be a true true MPPT controller it must contain a coil of copper wire that is rather heavy. Without this coil it cannot do the MPPT functions. If it were truly an MPPT controller you would be able to connect to Solar Panels in series bringing up the voltage even though your battery bank is a 12 V system.
I looked over a lot of solar charge controllers and Victron was mentioned quite a few times in reviews. I got a Victron MPPT 75/10, a 10 Amp controller which can charge 12, 24 or 48 Volt batteries of various chemistry from 12 to 48 Volt solar input. I have a small 20 Watt panel I want to use to keep my truck battery full. Victron has a four stage algorithm even on this small controller. The controller weighs 0.5 kg. The board is potted, but it looks like there’s a toroidal coil in there to make true buck/boost operation feasible. As one would expect, Victron has a Bluetooth app. I don’t like to load up my device with apps, especially from heretofore not known companies. I even have some reservations with the app from Victron who is a Netherlands based company, but uses Chinese manufacturing.
@@wtmayhew I have a Victron MPPT for a small 4-500w solar set-up. It works well, was fairly priced and seems like a company that actually is pretty honest about their specs/rating.
@@boots7859 Thanks for the reply. I am impressed by the build quality of the small 10 Amp Victron controller. I feel it was worth the slightly higher cost versus a generic controller. The Victron controller has separate pairs of terminals for solar, battery and load which allows it to closely track energy flow.
@@wtmayhewI haven't yet bought a victron because I too do not like the Bluetooth option. I want to run a rf clean setup because I do RF monitoring and having a huge rf source inside the testing area isn't feasible. Renology is a company that makes one without Bluetooth. Unfortunately they don't make one that supports my use case.
Please turn off "Stable Volume" in the video playback setting (the first menu item after clicking the gear icon) as for some reason, this new RU-vid playback feature made the video much noisier than usual.
There is a better option for flat-top cells. I use Kelvin dual-prong probes. Each pen has two sharp, gold-plated pogo pins that are closely spaced. At the other end is a fixed-spacing pair of banana plugs for red and black. All I have to do is clip the FNIRISI alligators in the open position to these two plugs. They fit very well in the pass-thru receptacle side of the banana plug end. I'm sure you have the same sort of probes somewhere.
Is it possible to measure 230 V AC generator output and check if it is of pure sine wave and its frequency. If so how to measure as the max input is 10 V per division
Grad is a much better word than discharge as it's far more complicated than just discharging. It's first charges, then discharges and then charges again.
you have too many electronic measurement devices , you dont know what to do with them , i run a repair shop , for Computers , TVs , that stuff , this is not how you use a scope
Here because I am deciding between these very two DMM's, 3 yrs after this video posted. I want the UT61E+ but buying the AN870 based on price. AN870 price has come down with accessories, case, where the UT61E+ has not. Price is 3 to 1. The UT61E+ looks great, love data logging, but realistically not sure how much I'd use it. I'd use Temp probe more, but frankly I found in general temp readings on multi meter temp probes hit or miss. I hope the AN870 is close. I do have a DMM with temp already and it is pretty good. However IR Temp gun or mechanical temp gauge are my go too for accurate temp.
Here's the crazy thing - the modern version of this inverter no longer has a switch that can shut it off. It's still marked On/Off, but it's a rocker switch (looks the same as the one you have) that only allows the unit to be turned on, then it springs back to the 'Off' position without turning the inverter off. Both the unit and the remote only have the 'On' function.
