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Since about 2010, some scopes are very affordable (toolbox real-estate, weight, cost, ...) and investment is often returned on first or second install.
* DSO138-style pocket scopes, and USB scopes come to mind. ** wether you are a professional installer, or going to become one, or a novice, doing the first install, make sure to always have oscilloscope * As of 2018, DVM + oscilloscope (yes, both!) is considered an essential tool, (helps you a lot, and helps everyone who tries to help the installer) required for support (even if DVM is still used slightly more often). * DSO138 pocket scope can be ordered as ** DIY "KIT" solder yourself (avoid, unless for fun; if you also have another, factory assembled device) ** SMD-soldered (the throughole is still solder yourself: avoid). Examine the ad: if there are pictures of both assembled device, and some standalone resistors, assume that it is solder yourself version (avoid) ** soldered : good, choose this only ~3 EUR more than the smd-soldered or DIY kit. |
| '''No need for 20..100MHz scopes... 1Msps is almost always suitable, or even 500ksps. |
| No need for 20..100MHz scopes... 1Msps is almost always suitable, or even 500ksps. |
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* a divby10 probe or a voltage divider protection never hurts
** the DSO138 is better, less work, easier to use than a 3.5mm jack +notebook soundcard input ** soundcard input often creates a ground loop (often the USB-RS232 is also connected to same ECU). Might work well in practice though ** soundcard input is often mono, not stereo, be warned |