That is not my experience. I bought several kinds on eBay after
inquiring and being assured by the seller that the meter would measure
and display a negative voltage, only to find on receipt that the meter,
powered from +5 vdc, displays zero, close to zero or a nonsensical value
when the sense lead is connected to a voltage negative with respect to
the return for the meter power.
And, on close inspection, the display has no LED segment to indicate a
negative voltage.
The other dirty little secret about these cheap meters is that their
response or settling time can be two seconds!
Has anyone actually got such an inexpensive panel meter that measures,
displays the negative voltage and indicates that the voltage is
negative? If so, please refer me to the sales listing.
Larry
On 9/7/2020 12:53 PM, Jeremy Nichols wrote:
All of the cheap 3-digit panel meters I’ve purchased have the ability to
read/display positive and negative voltages.
...
--
Best wishes,
Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)
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