this is a charger, not a load, I just talked about the USB load
Do you plan to release a usb load with PD trigger and higher power capability?
Yes, I’d love one.
I’d also be willing to pay a pretty penny for one.
Also maybe with solder pads or terminals for connecting other than USB devices directly without a USB adapter, since that’s a lousy connection.
If you’re willing to pay pretty penny I’d recommend YZXstudio zl1100, it can trigger every charge protocol, 0-3A ramping, serial data logging and up to 60W PD (indefinitely with the correct cooling conditions).
Everything is managed via the integrated OLED screen but you can easily translate the serial data into graphs with jcharts or similar tool.
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?!?