FNIRSI 1014D Oscilscope Modifications

In this video I talk about the modifications I made to my FNIRSI 1014D Oscilloscope. I added an IEC connector on the back and I added an internal power supply. Now a Switch can Select between USB power or the internal power supply. I also added a ground lift switch so that I can choose if I want the probe grounds shorted to mains earth.

[James_Bowie]

So, you put a high noise-generating SMPS right next to the scope's circuitry?

[davidvanhorn]

Can you say what the specs are on the coaxial power connector? I've lost my cable and I need to build another one. Polarity, inner and outer diameter.

[rasirone]

You problem with the batteries isthat you used 4 batteries it can fit at least 11 x- 18650 in parallel the scope draws 1.06 Amps the step up 5v boost draws 1.6Amps depends on which boost you use, I'm testing mines with 6x 3, 700mah flat batteries in parallel

[naseer]

This scope is a fraud and not worth wasting time on.

1- The sensitivity is too low, i.e. the minimum u can get is about 100 mV / div. Which is not adequate for some applications.

2- The Triggering is faulty and pretty much useless. Specially when the duty cycle is low.

3- It is CERTAINLY NOT a 100 MHz scope. At best it can be called a perhaps 25 to 30 MHz scope. The ADCs used inside can deliver a bandwidth of 300 MHz. However the sampling rate is no where enough to get even to perhaps 100 MHz. There is usually a way around that. And that is that, some manufacturers (not so common now) provide the equivalent sampling mode. But this manufacturer is a habitual liar in many specifications. And of course ETS (Equivalent time sampling) mode requires some work to be done. So its not there. Therefore its a waste of such marvelous Analog Devices ADCs inside.

4- The main selling point of this manufacturer (that was attracting, but not sure if its there or not) is that it is hardened against rotary knob failures. Which is a major weakness in the scopes built by low end manufacturers (other than the renowned, HP, Tek, Iwatsu, LeCroy, etc.) has been. These rotary knobs are rotary encoders. And they fail after about 1-2 years (or a bit more). They can fail regardless of the usage hours. And that often requires opening the scope and finding the faulty knob and replacing that. The FINIRSI claims that this scope has been hardened against those failure, through some special algorithms in the controllers inside. Of course I doubt them as I doubt anything they say. A scope is usually a main investment of any Electronics engineer lab. And its reliability is of paramount importance as it is the eyes and ears of the serious engineer who wants to do something meaningful. So if one wants to have a reliable equipment like that, then either one should choose a touch screen scope or a scope where most work is done through pressing buttons instead of rotary encoders. If not, then one should stock a few encoders and get used to the idea that this would be required every few years. Solder suckers and a heavy soldering iron (to remove) i.e. 60 Watts, should be at hand. I usually don't install the new encoders through the holes. I prefer a bit of surface mounting style, to ensure that they would be easy to remove and replace later.

For any engineer, a good bandwidth scope is an invaluable asset. Usually a 100 MHz is required for serious work. Anything beyond that is already a difficult feat. Because the probes are the main culprit in the process. Its very tough to get down below 3-4 ns, rise times, even with high frequency probes alone. One has to resort to spring attachments to reduce or eliminate the inductances introduced by the earthing clips. Without that arrangement its almost impossible to get below 4 ns. The effect of ground clip inductance is really very prominent as soon as u hit the 5 ns rise time waveforms. Its almost a shocking experience. So for pretty advanced engineer a 100 MHz scope is usually good enough for over 98% of the tasks he would ever take up. Unless u are really a person determined to get into the very high speed arena. Which is of course a very difficult domain.

[MustangBoss]

If Barbie's Ken had a scope this would be it.

[James_Bowie]

WD40 is NOT a lubricant! If you want to be an engineer, as opposed to a hack, use the correct fluids on electrical and electronic parts.

[СергейЕрмаков-ре]

Мальчик малограмотный. Поэтому несет бред.