Too bad my first batch ZL1100 can’t trigger PD even with a newer firmware. Just says NG. So make sure you get a recent one.
for now , we don’t have plan on load, we are designing a big display, many button and function power supply
higher voltage is useless, big current is very important , HD35 have 5A current . 35W is enough
Yes, but higher voltage is necessary to test high power USB-C PD sources.
I mean, with a 3A cable at 20V, it goes up to 60W.
At 20V with a 5A cable, that goes up to 100W.
A 100W USB PD 3.0/QC 4.0 load would be large, but very useful for many years to come.
for PD, I will consider
It doesn’t have to support 100W constant because that would be very difficult to cool, but 60W is plenty to test most power supplies and powerbanks.
When the industry is moving towards higher voltage, 5V testing becomes irrelevant because it will be considered slow charging anyways.
how about AT35, published today.
It is similar to AT34 but you will find there are differences between this two devices. It is higher version of AT34. The important improvement is the voltage and current accuracy, now voltage and current are displayed in 5-digit, voltage resolution 0.001V, current resolution 0.0001A. you can see that at the detailed page. As old rule, new products…
And as old rule, new products publishing have lowest price only 4 days, 9.8 usd/piece, if buy more 2 pcs, 8.8 usd/piece.
product link:click here to view AT35
product video:
High volts and amps loads probably need to be big or have high revving cooling fan.
Yes, probably.
I’d like one even if quite large.
not interesting for AT35. but it don’t have big change 
This page covers specs of the RD devices
https://sigrok.org/wiki/RDTech_UM_series
And this is good for logging data, it can output JSON
One thing I’ve noticed with my RD power meters is that the USB sockets seem to wear out and gives an increased voltage drop
thank you for your share,. it is great . for voltage drop, could you show me ?>
Bad day, my faithful YZXStudio 1270 has seen his display crushed. It is serviceable ? If so where to find a replacement screen, or who could repair it ?
Anyone ?
I have an issue with my TC66C, which I bough off Aliexpress on your official store:
I use the RD-TC66C in “PROTOCOL DETECTION” mode, with this item:
I bought the model with USB-A + USB-C from Aliexpress, the model is “Baseus BS-C20C” and is written on the housing.
The issue is: when doing protocol detection everything goes on, until it reaches HUAWEI SCP where your meter powers off and turns on again. Could you check what is happening?
If I connect first a Samsung S10 phone to one of the ports, then the TC66C doesn’t reset but then the protocol results are not the same, maybe the ports of the car charger are not independent?
Related article: The Baseus BS-C20C in the test! USB PD, QC 3.0 and Huawei Super Charge in one car charger for € 10?!?
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it is Baseus products problem,his charge is bad , he did not use standard charge protocol and use the third part protcol and miss something
at our product page , we write”our products are not compatibility with baseus product”, because his quality is not good, although they sell well, Ugreen charge don’t have any problem
for this problem , we have 2 solutions
1, in fact we already solves this bug , and you can connect PC software to update firmware , it will work
2, you can use micro power to power on , it will not show this problem
Baseus PD car chargers are trash and DANGEROUS. I bought two of the 30W PD + USB A on sale and both failed safety and functionality tests.
The problem you’re describing is mainly because the charger only works in BUCK mode, which is not specified anywhere so in order to achieve 45W output which is 15V3A you must have it connected in a 24V vehicle. Charger is unable to output above 9V and will restart when such voltage is requested.
Secondly the USB A and usb C port are not well isolated for “dumb” usb devices. Normally when you connect a 9V and a 5V device simultaneously the charger must restart to provide 5V on both ends in case it can’t provide both 9V and 5V at the same time, however with the baseus car charger it will simply provide whatever voltage it’s on the C side as long as the A port device isn’t requesting any specific voltage.
In order to perform the above test I used iPhone X with fast charge cable and a cheap lantern that I quite liked on the other end and the instant 9V charging via micro USB blew the resistors. $10 lantern lost because of a $5 charger.
I like that Baseus charger because displays the voltage of the car, the voltage being outputted and the amperage being outputted.
I have used TC66C on a 24V car and has the same issue, it’s not the voltage that makes TC66C reset when doing PROTOCOL DETECTION.
[quote=RD tech]
Ok did some more tests and this is what I’ve found:
- TC66C Firmware upgraded from 1.13 to 1.14
- Now if I connect the TC66C directly to the C port of the Baseus your meter doesn’t turn on: Baseus <-> TC66C
— However if I use C to A and A to C adapters in the middle then it turns on: Baseus<USB C to A<>USB A to C<->TC66C. Why is this difference happening, is that the adapters modify something in the middle?
- If I connect the TC66C to the A port on the Baseus I need one A to C adapter and turns on again without load.
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PROTOCOL DETECTION detects everything as green when connected to C port on the Baseus and battery is 24V. If I connect to A port it’s the same result but TYPE-C PC is red instead.
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Which protocol Baseus does not meet properly?
While using C to A and A to C again you will just have the A protocol.
Looks like the Baseus is causing the problem.