Need an inexpensive oscilloscope?

[papaof2]

FNIRSI DSO152 Mini Handheld Digital Oscilloscope Latest Version 2.5MSa/s 200KHz Analog Bandwidth 800 VPP with PWM Output - upgraded version black

"Upgraded" means they include a standard 'scope probe with clip-on tip. $25.99 + tax. Free ship.

On-screen of Max volts, Min volts, Volts peak-to-peak, RMS volts, % duty cycle, Cycle period.

Useful if the highest frequencies of interest are 200 kHz or lower. Fine for power, audio and vehicle trouble shooting - it would quickly run out of steam if you're trying to do RF things. Power is a rechargeable battery so it's isolated for doing AC power work - just remember to keep one hand in your pocket ;-)

The "PWM output" means that it generates a 1 kHz calibration square wave.

www.banggood.com/FNIRSI-DSO152-Mini-Handheld-Digital-Oscilloscope-Latest-Version-2_5MSa-or-s-200KHz-Analog-Bandwidth-800-VPP-with-PWM-Output-p-1989991.html

The link to the manual no longer works but you should be able to find the equivalent info on the sales page.

If I didn't already have the previous version (external power), this one is worth the $$ with internal power and a stand to keep the screen at a viewable angle.

[feralferret]

How I would have loved to have one of those when I was doing the radio station engineering. It would have made audio troubleshooting and adjustment so much easier. I also weighs a lot less than the old USN surplus tube type oscilloscope I had at the time.

[papaof2]

Weighs less than 1% of the Textronix 485 I got through AF MARS a number of years ago - but doesn't have the bandwidth or the dual trace plug-in ;-)

I found a Tek 2247 solid state scope with CRT display on Craig's List for $100 a few years ago. You could stack at least 5 of the 2247s in the space of the 485. The 2247 is dual trace and external trigger - but no plugins. Great deal at the time and it's still on the counter next to the ancient EICO audio generator I used for checking for frequency matches on some ultrasonic transducers. The 2247 worked about a year ago so I'll assume it's still good ;-) In the meantime I've used the little DSO-150 (kit grandparent to the DSO-152) a lot for checking things about power. It runs on 9 volts but I have 5 to 9 volt boost converter that plugs into a USB port and there's a 5000mah powerbank that lives next to that 'scope. Unfortunately, the grandparent doesn't have auto-ranging or on-screen display of all the parameters. Still worth the $20 or so I paid for the kit 5+ years ago...

[feralferret]

"ancient EICO audio generator"

I've got one of those too!

[papaof2]

I once had the matching EICO 'scope (427?) but it was either sold or given away some time in the past 50 or so years...