Hi guys I've been looking at buying an oscilloscope to use at work for stuff like cam/crank/abs sensors etc and really want to learn how to use one. So I can be the quickest in the diagnostics box over my other work monkeys. It's a Canadian product so got to be better than the Chinese stuff!? I messaged the seller about some of there scopes and they recommended me this one as it's battery powered and as the one I was looking at needed to be plugged in. I don't really know about the tech spec so would be great for an opinion http://www.ebay.co.uk/itm/160787624942?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 Manufacturer JYETech Model 09602 (DSO 096) Quantity 1 Oscilloscope (Assembled) 1 20MHz Probe (1x/10x) 1 3.7V, 1200mAh Li-ion Battery 1 Instruction Sheet Technical Details Manual Quick Use Guide Firmware Update Guide Firmware Firmware Update Windows Software USB-UART Virtual COM Port Driver Applications Test Equipment Sample Rate 2Msps Product Information Description This is a great oscilloscope which, along with signal metering, contains DSO, FFT and frequency metering functionality. This is an improved and modified version of the green 062-series oscilloscopes we carry in our store. Major improvements include the following: The bandwidth has been greatly improved from 1MHz to 5+ MHz Sensitivity has been improved 10-fold from 100mV to 10mV The frequency meter has been improved 4-fold from 5MHz to 20+ MHz and can measure signals as small as 0.2Vp-p Scope is battery powered (battery IS included) and has a built-in 3.7V li-ion USB charger Scope has a built-in USB-UART converter for simple firmware updates and waveform uploading Specifications Vertical Number of Channel: One Analog Bandwidth: 0 - 5MHz Sensitivity: 10mV/Div -- 5V/Div Resolution: 8-bit Input Impedance: 1M ohm/25pF Maximum Input voltage: 50Vpk (for 1X probe) Coupling: DC, AC, GND Horizontal Max Real-time Sampling Rate: 2MSps Max Equivalent-Time Sampling Rate (hardware): 20MSps Timebase: 0.5us/Div - 10min/Div Record Length: 256 points Run/Hold Modes: one button switchable Trigger Trigger Modes: Auto, Normal, Single Trigger Types: Rising/falling edge Trigger Sources: Internal only Trigger Position: Adjustable Trig Point Indicator: Yes Other Features Save/Recall up to 6 captures Screen image hardcopy USB connection for data transfer and firmware upgrade FFT with selectable length of 256 or 512 points and sampling rate from 1KSps to 2MSps Display 2-inch 128 X 64 black-and-white dot-matrix LCD Backlight ON/OFF control Contrast adjustable Power Supply 3.7V Li-ion battery/USB Supply voltage range: 2 - 5V Supply Current: 210mA @ 3.7V(LCD backlight ON, typical). 150mA @ 3.7V(LCD backlight OFF, typical) Battery over-discharge protected Physical Dimension: 140mm X 65mm X 25mm Weight: 150 gram (not including probe and battery)
In terms of functions it'll be way more than sufficient for automotive use I'd have thought. One thing that worries me though is the input voltage range. You'd potentially zap it if you happened to touch the probe on a coil primary where back-EMF can result in many tens or hundreds of volts. I would have thought that a specialised automotive 'scope would be more hardened in this respect.
Thanks for the reply Trev I thought for 50quid It might be worth a go compared to one for automotive which would cost I've only used a multimeter to test the resistance and voltage on a coilpack but I am learning.
I reckon it's great for the money! I'm guessing it's probably not quite as electrically 'hardened' as a typical 'pro' automotive oscilloscope, so you might want to be extra careful about keeping the probe away from the HT side of things (even coil primaries). So I'd avoid using it to measure the tacho signal into the back of the Golf MK2 instrument cluster (just as an example) as this comes off the coil primary. Actually, what I would really recommend is that you use a "x10" probe with it. This kind of probe attenuates the input voltage signal by a factor of ten. Then I'd be pretty happy to probe just about anywhere with it. (oo-er.) Edit - just noticed it's actually supplied with a x1 / x10 probe. So I'd recommend always keeping it switched to "x10". (The voltages you read on the scope will read smaller by a factor of ten; e.g. 1V reads as 0.1V, unless the scope as a feature to compensate for an attenuating probe as many scopes do.)
Oh thats great news so I could use it for just about anything then I'll have to email them back to ask if it compensates for a true reading using the x10 feature. Hopefully it does but I'm sure I can adapt to working it out thanks trev
Yeah it's quite common to work with a scope using a x10 probe and have to compensate for the x10 factor in your head (e.g. 1V is really 10V). Total non-issue really.
You can get *100 probes also. I have a 4 ch one and know a wee bit about this stuff. Pm me if you like Jon
Ok so nobody laugh but I picked up one of these in China when I was between a rock and a hard place one day - they are now all over ebay, http://www.ebay.co.uk/itm/New-Arm-D...d=100005&prg=1048&rk=1&rkt=5&sd=360749538059& It was 200RmB - about 20 euro, and........I still use it all the time for automotive work even though I have far better ones both portable, and bench units Its just so handy, small, and light, AND, it actually started life as an mp3 player - they build the scopes into leftover mp3 casings lol Im by no means saying its good, but for 5v stuff, and a bit more it does everything you want at a throwaway price. Brian,
To be honest a lot of these el-cheapo scopes could be better now than the massive old 1990's Gould 2-channel colour scope I have. Lovely machine and big as a suitcase. Found in a skip by a mate, and I had to spend 23p to replace a dead FET to get the second input channel working. That's literally the most I've spent on a scope...
Being there in person was even more hilarious at time of sale. I ventured out without my translator, needless to say it came down to sign language and shouting in the end. I stood on it yesterday and it still works so it passes that test too. Brian,
Guys I was looking at those cheapy cheap ones before and was thinking it probably wouldn't be calibrated and wouldn't have anything to bench it against damn cheap. Still it led me to my Canadian born ones. Any good guides I can use to get some baby steps with
On a automotive scope which I both use & own I've never seen one with a protection circuit from KV from a HT, they have a lead that goes around the HT & a different setting You can with any also read the secondary wave form without physical contact to the circuit I love scopes :-) I have also have a snapon skip save ignition focused scope which has dedicated setting dwell angles & compare , its bigger than a suitcase, with a green screen the size of my phone !
I have one of those, for the money they're brilliant for DC/low frequency stuff! Quite handy too due to being battery powered. Make sure and upgrade to the BenF firmware, it adds a few new features and solves loads of bugs in the standard firmware
Coil primary is lv, its the secondary you need to consider hv. Most scopes come a 1V pk-pk LF square test point which you can at least get your triggering sorted on, and tune the scope lead / establish your y axis scaling etc. Even nice sometimes just to get a picture.... Jon
On the coil primary you still have peaks of tens or hundreds of volts due to back-EMF. I'd be concerned that might be enough to zap the input stage on some of these scopes.
