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Reviews (10)
May 13, 2020
Good replacement for glazed belt
The belt was a little bit smaller and stretchier than an OEM belt but so far I think this is a good thing. It grips the motor and brush roll well and doesn't slip like some other belts.
Jun 10, 2019
Okay for most mid-frequency applications such as SMPS and class D amp repair. VERY nonlinear at higher negative voltages
4 of 4 found this helpful For something that fits in your pocket, this oscilloscope is quite good. It is fairly simple to use, with a quick and easy "auto" mode that works surprisingly well to choose good initial settings for whatever waveform you are viewing.
The claim of 1MHZ bandwidth is also fairly accurate, as it displays square waves cleanly up to several hundred KHZ. Just what I'd expect for a 1MHZ scope.
This scope is perfect for debugging medium-high frequency circuits such as motor controllers, class D amplifiers, and anything that operates below about 100-200KHZ. Above that, you'll need a better oscilloscope.
The only drawback is the duty cycle measurement. It does not work at all unless you zoom out enough to see several cycles, hiding the signal's finer details. However, when it works, it's quite accurate and reliable.
EDIT: The oscilloscope has SEVERE nonlinearity on the higher (10V/div, 20V/div) settings with negative voltages. To get accurate readings, you'll need to buy (or make with resistors) a 10x probe. Otherwise, below around -10 volts on the input and you'll see terrible distortion (huge valleys in the wave) on the screen which is not present on the input signal.
Apr 28, 2019
Extremely accurate, easy to use, but OVERCHARGE HAZARD at 5v
1 of 1 found this helpful I set the module this morning and it is still exactly on time, no loss or gain. Accuracy is definitely within spec and I expect it to gain or lose at most a minute per year without even touching the calibration register. With calibration, I see this being accurate to +- 10 seconds a year. Great for set and forget applications.
This device is easy to use. It is simple enough that no library is needed for interfacing, just the address table found in the ds3231 datasheet and the Wire library for Arduino.
The only downside of this product is that there is a resistor and diode to recharge the coin cell. While this would work off of 3.3 volts, this could DANGEROUSLY OVERCHARGE the coin cell at 5 volts and significantly reduce its life or even possibly become a fire hazard due to lithium plating. According to the datasheet, the RTC should last around 10 years off a CR2032 cell, so what is even the point? To prevent this problem, cut the trace going from the red diode to the coin cell positive terminal.