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Voltage difference between terminales

DMM6500 6½-Digit Touchscreen Multimeter
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zvikae
Posts: 20
Joined: July 12th, 2016, 12:55 am
Country: Israel

Voltage difference between terminales

Post by zvikae » June 21st, 2018, 11:26 pm

Hi.
when measuring resistance, is there a limit for max voltage difference between input High and sense High? and input Low and sense Low? (like the limit in SMU's).

Brad O
Keithley
Keithley
Posts: 28
Joined: February 3rd, 2018, 10:43 am
Country: United States

Re: Voltage difference between terminales

Post by Brad O » June 22nd, 2018, 7:33 am

There's no specification for maximum allowable voltage between the input and sense terminals, however, there are still some limits present in other specs.

In terms of safety, there should never be a voltage difference larger than 350 V between either sense terminal and input Lo (this is independent of whatever voltage is present on input Hi). Specifically for 4-wire resistance, page 3 of the DMM6500 Specifications list a "Maximum 4-wire lead-resistance". These resistances, multiplied by the Test Currents for the proper range listed at the top of page 3 would give you the maximum voltage drop between terminals before you may start to see measurement errors.

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