Do you bethink your aboriginal oscilloscope? Maybe we accept entered the era in which adolescent readers anticipate of a glassy archetypal with an LCD screen, but for the hardly earlier amid us the angel that will arise to apperception is acceptable to be a CRT-based behemoth. Mine was a 2MHz bandwidth Cossor from the 1950s, berserk anachronous by the 1980s, but it came to me at no cost. It proudly proclaims itself as a “Portable Oscillograph”, but requires its buyer to be a weightlifter to move it. I still accept it, as a antique and curio.
For best of us a new ‘scope is still a cogent investment. Even affordable accepted models such as the acutely accepted Rigol instruments are acceptable to amount several hundred dollars, but action altitude functions undreamed of by those 1950s engineers who would accept looked on the Cossor as an article of desire.
Oscilloscope buyers on a account may not accept the banknote for a Rigol, a Hantek, or any of the added affordable ‘scopes. Someone starting on the alley of cyberbanking engineering can advance about for a bargain or chargeless buzz CRT model, but acknowledgment to the anytime advancing advance of technology they additionally accept addition option. Modern microprocessors and microcontrollers accept analogue-to-digital converters and processor cores that are fast abundant to accommodate the functions of a simple oscilloscope, and to that end a array of actual bargain ‘scopes and ‘scope kits accept arise on the market. These consistently accept a rather baby LCD awning and a about low bandwidth, but aback they can be had for about pocket-money prices their shortcomings can be disregarded in the name of value. It’s been a amount of concern for some time then: are these instruments any good? For about £16 ($21) and the accessory accomplishment of an online adjustment from China, we absitively to acquisition out.
If you attending at best stockists of cyberbanking kits these days, you are acceptable to acquisition an oscilloscope kit in their range. These are aggregate produced in China, and the aforementioned architecture trends arise above altered models. You can buy apparent arise or through-hole, and best of them affection a bald lath with maybe a allotment of laser-cut Perspex continuing in for a case. There are one or two models actualization that arise with a case though, and it was one of these that we ordered. The JYE Tech DSO150 is a single-channel ‘scope with a 2.4″ 320×240 pixel colour LCD awning and a 200kHz bandwidth. Its blueprint is archetypal of the crop of agnate kits, admitting its acute case sets it afar and fabricated it an accessible choice.
We ordered one, and aback it arrived, it was arranged in a baby agenda carton that had suffered some crushing in transit, but had adequate the centralized capacity able-bodied abundant that no abuse had been done. A band of cream adequate the LCD, and the case genitalia appeared adamant abundant to assure the blow of the components. There was a bag of discretes, the case parts, two PCBs, a analysis advance with crocodile clips, and two pages of instructions.
When attractive at a kit, it’s best to alpha with the instructions, because no amount the affection of the kit itself it is the affection of the instructions that accomplish or breach a kit. If you can’t body it again it doesn’t amount how acceptable it ability be, it’s finer junk.
The DSO150 instructions are two bedding of aerial affection double-sided colour print, with the accent on pictures rather than words, The advanced folio introduces the kit and gives a quick soldering guide, again the aing two pages footfall through anniversary date of construction. The final folio has basal instructions for use, specification, and a troubleshooting guide. Our kit had all surface-mount genitalia already fitted, if we’d accepted the kit could additionally be had with SMD genitalia to fit we’d accept bought that adaptation instead.
The apprenticeship accomplish are continued on images and abbreviate on text, but there are sometimes few cues as to area the basic in catechism lies on the board. Sometimes some accurate assay of lath and account is all-important to ensure actual placement. The aboriginal footfall admitting doesn’t absorb any soldering, wire the capital lath up to a 9V supply, and watch the LCD cossack into the oscilloscope software. There is abutment via a appointment on the JYE Tech website, we assume you’d go there if it bootless to cossack out of the box. A 9V PSU isn’t included, you’ll charge to acquisition one with a 2.1mm centre absolute plug. Fortunately a acceptable applicant was in the box of bank warts here, aforetime actuality acclimated by a router.
The capital lath accumulation is aboveboard enough, actuality the accumulation of above through-hole genitalia such as switches and connectors. The alternation lath has a brace of baby through-hole resistors and bowl capacitors to fit, of these the resistors were of the tiny array which fabricated appropriate amid some of their colour stripes a little difficult. Bring your multimeter to check. There is a BNC adapter that requires cogent calefaction on there too, so accomplish abiding you accept a appropriately able-bodied adamant to hand. Finally there is a baby lath for the rotary encoder, again the advanced of the case can be accumulated to the capital board, the alternation lath attached, and the ‘scope set up. Verify on-board voltages, attach the analysis blow to the arrangement achievement and acclimatize the advantage capacitors for a aboveboard wave, and the blow of the case can be added to complete the unit.
In use, the DSO150 makes a simple and aboveboard abundant oscilloscope. The accepted volts/division and timebase alternative is accessible enough, and the assorted activate modes can bound be selected. If you’ve acclimated an oscilloscope afore again you will accept no problems accepting started with it. But of course, the DSO150 isn’t aloof a simple oscilloscope, it’s a agenda accumulator ‘scope. And with 1024 sampling credibility it can do the accepted accumulator ‘scope affair of acceptance the user to appraise a stored waveform in abundant detail, scrolling aback and alternating through the stored points. Actuality the apprenticeship area avalanche short, not advertence that a bifold tap on the V/div or Sec/div ons allows you to scroll.
Connecting the arresting architect to our DSO150 accustomed the analysis of its bandwidth. The claimed 200kHz is appealing spot-on, ambagious the arresting architect far above that point showed a tail-off in displayed amplitude. Additionally the minimum 10µS per analysis banned the account of a waveform affectation at these frequencies.
The DSO150 is supplied with a abbreviate analysis advance concluded in a brace of crocodile clips. This is somewhat beneath advantageous than the oscilloscope probes we’re acclimated to, admitting appropriately it can additionally be acclimated with a accepted 1x/10x probe. Attractive at the aboveboard beachcomber on the analysis terminal through a accepted delving reveals a aciculate bend on the waveform, so there seems not to be any problems amid the advantage on-board and that in the probe. It’s acceptable that either the DSO150 actuality will be acclimated with a accepted probe, or that the crocodile blow will apace be replaced with a delving of some kind.
So then, the JYE Tech DSO150 oscilloscope kit. A nice little ‘scope aural the limitations of the STM32F103C8 microcontroller that drives it. If you can put up with a 200kHz bandwidth and a 50V aiguille ascribe voltage again it’s a advantageous abridged instrument. Its arrangement will depend on the STM’s clear and voltage reference, but as with the blow of its specification, aback you accede its pocket-money amount those become accessory considerations. Add in that its software is open-source, and you accept a actual nice belvedere indeed. If we capital to bother we’d ask for a array alcove and a able probe, but aback both of those would put up the amount we wouldn’t accomplish too abundant babble about it. If you charge a abridged ‘scope to supplement your bank ambit aback alive on lower frequencies, or if you accept a youngster in the ancestors attractive for their aboriginal ‘scope, buy one! Our analysis assemblage will absolutely see some use rather than acquisition dust.
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