USB power meter/tester thread - YZXStudio, Power-Z, RDTech and more.

396 posts / 0 new
Last post

Pages

2A
Offline
Last seen: 11 hours 29 min ago
Joined: 05/18/2020 - 09:57
Posts: 529
Location: quarantained

There are newer Type C testers which are supposed to be bi-directional. I haven’t tested them though, partly due to price (these were 30+ $US), partly due to lack of details or reviews.
I also don’t really know what to do with testers, I’d rather buy a proper multimeter beforehand.

sam_sam_sam
Offline
Last seen: 5 days 12 hours ago
Joined: 11/21/2020 - 10:22
Posts: 18
Location: Jacksonville Florida

These tester are very nice if you can get one that works correctly with USB C but this where the problem starts not all of them work correctly the way they are presented

Soldering Slave

e700
Offline
Last seen: 4 days 16 hours ago
Joined: 04/08/2021 - 11:36
Posts: 2
Location: UK

Hi,

Im looking to purchase a multi (type c + micro) usb volt meter, any suggestions which one to go for?
Typical use is to test power to and from mobiles / usb devices, personal devices.

d_t_a
Offline
Last seen: 4 hours 59 min ago
Joined: 08/04/2017 - 23:58
Posts: 2311
Location: Manila, Philippines
sam_sam_sam wrote:
These tester are very nice if you can get one that works correctly with USB C but this where the problem starts not all of them work correctly the way they are presented

I’m not that well-versed with how USB-C (in particular, USB-C that has PD or Power Delivery) works. I think that may be one of the reasons why some USB-C testers will not display information unless there is a USB load (or a USB-PD device) on one end.

From my limited understanding (note: might be wrong, because these are only from what I remember reading about them).

For USB-C with PD power source (whether it’s a USB-PD power adapter or a USB-PD powerbank), if a device (or USB tester) is not requesting some kind of power (I think there is some “handshake protocol” or some such thing that happens), then the USB-PD power source will not give power to the device or USB tester, thus the tester “doesn’t work”.

Some USB-C testers will have a “PD switch” to enable/disable — I think this place the tester in a mode where it will request power, however, this might also mean it won’t be properly monitoring (I could be wrong here in my understanding) the energy flowing since supposedly the USB-C tester is just monitoring the flow of current, and not the main one requesting power.

Although I think it could be some USB-C testers may also not be properly negotiating the USB-C PD protocols (??).

gchart
gchart's picture
Offline
Last seen: 5 hours 20 min ago
Joined: 03/19/2016 - 11:57
Posts: 2943
Location: Central IL

I’m not well versed in these things, but I recently got a Fnirsi FNB38 which has both USB-A and USB-C ports. It has worked well so far, as long as you’re not looking to transfer the data off of it like some models offer.

Pages