DMM use on 3.3V logic circuits

I received a task to evaluate a circuit board that uses 3.3Vdc and electrical appliances down.  How can you test resistance or similar on the rails to power these devices to detect shorts to the ground before turning the power on.

In view of the DMM most voltage output exceeds the limits of rail of high-end device to measure how can I prevent damage to devices.

Hey, SMA,.

What is the output impedance of the three regulatory bodies?  As a general rule, the output impedance of power supply is quite low (<100 ohms),="" so="" we="" shouldn't="" ever="" reach="" the="" condition="" where="" our="" resistance="" exceeds="" the="" range="" while="" the="" dmm="" is="" connected="" to="" the="" dut,="" and="" thus="" the="" voltage="" should="" never="" exceed="" ttl="" spec.="" when="" connected="" to="" the="" power="" supply,="" i="" imagine="" you="" intend="" to="" perform="" an="">measureoffset offset ohms ?)  If not, let us know what you measure more precisely and we can using the case.

If you pass the signals and there is a chance that the DMM will float mode resistance, then when you switch your EHR, overage charges, held on the ability of the output of the DMM will temporarily cause a voltage surge until the ~ 12V up to your circuit has absorbed the load.  I doubt that this will have on the supply rails of current due to the small capacity and the low resistance of the EHR, but if you fear that the DMM will float between tests - causing charge injection on connect - then add a shock absorber for the DMM circuit leads will avoid damage your components.

Tags: NI Products

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