[Review] RD UM34C Usb Meter With Bluetooth Connectivity

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bilakos10
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[Review] RD UM34C Usb Meter With Bluetooth Connectivity

The UM34C was sent to me by RD Official Store in AliExpress for review.
Here's the product's page: RD UM34C


The USB meter comes in a simple tin box with a plastic display window.


The meter is seated inside a laset cut foam mold to protect it during shipping.


The device itself is using a quite big 1.44 inch color display with quite a sharp, for the application, resolution.
I found the viewing angle to be surprissingly good.


The back side of the meter has just a plastic piece to protect the pcb's components from an accidental short.


The upper side of the device utilizes a regular microUSB port along with two buttons used for controling the displayed information and a Bluetooth switch.
The manufacturer recommends that the maximum current through the port shouldn't exceed 2A, but my tests showed that the port can withstand higher currents than the ones stated.


Following the previous pattern, the lower side of the device implements a type-c port alongside with two more buttons.
The max recommended current through the port is 4A.


Powering on the device, introduces the user to the basic info screen.
(The 5 available info screens can be scrolled through using the lower two buttons)
The basic info panel displays the following info:
Voltage (V)
Current (A)
Power (W)
Capacity(mAh)
Energy (mWh)
Resistance (Ω)
Internal temperature of the meter (C)


The second screen except from the basic readings, introduces the voltage measurements of the data lines along with the current charging mode.


The third panel is used for displaying the basic stats of a charge cycle along with with a recording indicator and the nominal amperage after which the data recording starts (0.10A in our case).
The recorded data can then be extracted in Excel format through the dedicated Android application.


The fourth screen is a quite interesting one as it's used for measuring the resistance of a cable.
In order to get a measurment, an adjustable electronic load is needed in order for the meter to record the voltage drop across the cable and thus its resistance.


The follow up panel shows a graph of Voltage against Current over time.
It allows for a graphical representation of a power supply's performance under different loads.


The final screen allows the user to adjust some parameters in the way that the data is represented as well as set the screen's timeout.


Using the provided Android application, the user can have live access to the live data as well as control the device.
As seen, the applications gains access to every piece of information that the meter can display and also allows the user to tweak some of the available parameters.
Also, all of the saved data can be easily pulled into an .xls document.


To sum everything up, I was pleasantly surprissed to finally see a budget USB meter that can provide such a wide range of information.
I double verified the all the recorded data with two other of my usb meters and every reading seemed to be on point.

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Edited by: bilakos10 on 07/09/2018 - 15:25
angerdan
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Thanks for the review!

bilakos10
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angerdan wrote:
Thanks for the review!

You are welcome mate Smile

My daily deals thread: ☢ [Gearbest.com Special Deals]
If you need any coupon code, just leave a reply on the thread.

angerdan
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I’m curious about an YZXStudio ZY1280 vs. RD UM34C shootout Smile
Only the ZY1280 seems a bit expensive with ~$60.
http://budgetlightforum.com/comment/1350226#comment-1350226
http://budgetlightforum.com/comment/1324696#comment-1324696