Datasheet

09 | Keysight | U1280 Series Handheld Digital Multimeters - Data Sheet
General specifications (Continued)
Ingression protection rating IP-67, protected against dust and the effect of immersion between 15 cm and 1 m
Temperature coefficient 0.05 x (specified accuracy) / °C (from –20 °C to 18 °C or 28 °C to 55 °C)
Common mode rejection ratio (CMRR) > 120 dB at DC, 50/60 Hz ± 0.1 % (1 kΩ unbalanced)
Normal mode rejection ratio (NMRR) > 60 dB at 50/60 Hz ± 0.1 %
Dimensions (H x W x D) 218 x 96 x 59 mm
Weight 701 grams (with batteries)
Calibration cycle One year, or;
Two years (with 1.5 times of one year specification)
Specification assumptions
– Accuracy is given as ± (% of reading + counts of least significant digit) at 23 °C ± 5 °C,
with relative humidity less than 80 % R.H.
– Accuracy is specified for 1-year after calibration, at operating temperature of room
temperature. Multiply 1.5 times of the accuracy for 2-year after calibration.
Example ± (1.5 X % of reading + 1.5 X counts of least significant digit).
– AC and AC µA / mA / A specifications are AC coupled.
– True RMS measurement is valid from 5 % of range to 100 % of range.
– For non-sinusoidal waveforms, add (0.1 % of reading + 0.3 % of full scale) typically
– The maximum circuit limitation of peak signal is 300 % typically for voltage and
current except 250 % and 150 % typically for range 600 V and 1000 V respectively.
– The crest factor is according to the maximum circuit limitation of peak signal
– Specification is based on 5 times/second of data refresh rate
– CMRR and NMRR are based on 5 times/second of data refresh rate