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UNI-T UT61E Multimeter teardown photos.

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Brendan L:
How can a reading of less than zero ohms be achieved ?

HKJ:

--- Quote from: Brendan L on June 17, 2013, 06:06:32 pm ---How can a reading of less than zero ohms be achieved ?

--- End quote ---

A DMM uses a constant current generator and measures the voltage across the resistor. Any external voltage will upset the reading, i.e. a negative external voltage will (usual) show negative ohms.
A few DMM's can compensate for small external voltages.

T4P:
Apart from Agilent's magic volt bias canceller  ::)  :P
I certainly find that function very useful ... VERY USEFUL.

PedroDaGr8:
In case anyone cares, I did a quick test hooking my "new" oscilloscope up to the ut61e. Below 200nF it uses a clear square wave. Above this, it registers no load so it shows nothing. I preceded to add a 2200uF "load" which shows a clear 1Hz pulse train

Sent from my EVO using Tapatalk 4

cosmos:
The "new" scope picture looks like it came from a LeCroy 7200, a heavy power hungry beast sounding like a pair of 747s at takeof.
Turning off my 1kW electric oven and using the 7200 instead actually increased the room temperature.

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