5 Characteristics and Specifications
Specification Assumptions
156 U1271A/U1272A User’s Guide
Specification Assumptions
• Accuracy is given as ±(% of reading + counts of least
significant digit) at 23 °C ± 5 °C, with relative humidity
less than 80% RH.
• AC V and AC µA/mA/A specifications are AC coupled,
true RMS and are valid from 5% of range to 100% of
range.
• The crest factor may be up to 3.0 at full- scale except for
the 1000 V range where it is 1.5 at full scale.
• For non- sinusoidal waveforms, add (2% reading + 2% full
scale) typical, for crest factors up to 3.
• After Z
LOW
(low input impedance) voltage measurements,
wait at least 20 minutes for thermal impact to cool before
proceeding with any other measurement.
Measurement Category
The Keysight U1271A/U1272A Handheld Digital Multimeters
have a safety rating of CAT III, 1000 V and CAT IV, 600 V.
Measurement category definition
Measurement CAT I are for measurements performed on
circuits not directly connected to the AC mains. Examples
are measurements on circuits not derived from the AC mains
and specially protected (internal) mains- derived circuits.
Measurement CAT II are measurements performed on
circuits directly connected to a low- voltage installation.
Examples are measurements on household appliances,
portable tools, and similar equipment.
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