HP-3468A, Display Voltage VDC

[Dave Frederickson]

(05-02-2021 07:16 PM)Garth Wilson Wrote:  

(05-02-2021 06:55 PM)Dave Frederickson Wrote:  The reading isn't steady, it fluctuates like the signal from an unconnected scope probe. This isn't a problem, it's predicted behavior.

The noise I mentioned being caused by water-soluble flux would also cause an unsteady reading. The head post indicated a steady reading of 2.86V though.

The 3468 is a 5.5-digit meter. The first post indicates a reading of 2.86XXX volts where XXX is the unsteady portion of the reading. Every 3468 exhibits this behavior.

My 3468, for example, displays 0.2XXXXX (0.3V range) and slowly creeps up to 2.XXXXX volts (3V range) with nothing connected over several minutes. So the whole display is "unsteady" when nothing is connected and works perfectly when provided an input.

[cruff]

(05-02-2021 07:24 PM)Dave Frederickson Wrote:  My 3468, for example, displays 0.2XXXXX (0.3V range) and slowly creeps up to 2.XXXXX volts (3V range) with nothing connected over several minutes. So the whole display is "unsteady" when nothing is connected and works perfectly when provided an input.

Mine has the same behavior. If placed on the AC V setting with nothing connected, it showed about 3.1 mV, when I placed my thumb near the high input jack, but not touching the metal of the connector, it jumped to over 5 mV.

[Uli]

(05-02-2021 07:24 PM)Dave Frederickson Wrote:  

(05-02-2021 07:16 PM)Garth Wilson Wrote:  The noise I mentioned being caused by water-soluble flux would also cause an unsteady reading. The head post indicated a steady reading of 2.86V though.

The 3468 is a 5.5-digit meter. The first post indicates a reading of 2.86XXX volts where XXX is the unsteady portion of the reading. Every 3468 exhibits this behavior.

My 3468, for example, displays 0.2XXXXX (0.3V range) and slowly creeps up to 2.XXXXX volts (3V range) with nothing connected over several minutes. So the whole display is "unsteady" when nothing is connected and works perfectly when provided an input.

Thank you Dave. The creeping is what my 3468 does. Up to 2,86XXX VDC. Not mV, not AC.
When nothing is connected.
Same as yours.

[Uli]

New battery, calibration checked and ok. I am happy :-)