General Specifications

Display

Both primary and secondary displays are 5-digit on the LCD display.

Both the primary and secondary displays offer a maximum resolution of 50,000 counts.

Automatic polarity indication.

Connectivity

IR to USB

Power consumption

105 mVA/420 mVA (with backlight) maximum (U1251B)

165 mVA/480 mVA (with backlight) maximum (U1252B)

420 mVA maximum (U1253B)

Battery type

9 V alkaline battery (ANSI/NEDA 1604A or IEC 6LR61)

9 V carbon-zinc battery (ANSI/NEDA 1604D or IEC6F22)

7.2 V or 8.4 V Ni-MH rechargeable battery

Battery life

U1251B: 72 hours typical

U1252B: 36 hours typical

U1253B: 8 hours typical

Operating environment

– Full accuracy at –20 °C to 55 °C ; and to 80% RH for temperatures up to 35 °C,

decreasing linearly to 50% RH at 55 °C

– 0 to 2000 m altitude per IEC 61010-1 2nd Edition CAT III, 1000 V/CAT IV, 600 V

Storage compliance

–40 °C to 70 °C with battery removed

Safety compliance

– IEC 61010-1:2001/EN610101-1:2001

– Canada: CSA C22.2 No. 61010-1:2004

Measurement category

CAT III 1000 V / CAT IV 600 V

Emc compliance

Certified to IEC/EN 61326: 2002, CISPR 11, and equivalents for Group 1, Class A

Common mode rejection ratio (CMRR)

U1251B/U1252B: >90 dB at DC, 50/60 Hz ± 0.1% (1 kW unbalanced)

U1253B: >100 dB at DC, 50/60 Hz ± 0.1% (1 kW unbalanced)

Normal mode rejection ratio (NMRR)

U1251B/U1252B: >60 dB at DC, 50/60 Hz ± 0.1%

U1253B: >90 dB at DC, 50/60 Hz ± 0.1%

Temperature coefficient

0.15 * (specified accuracy)/°C (from 20 °C to 18 °C or 28 °C to 55 °C)

Shock and vibration

Tested to IEC/EN 60068-2

Dimensions (HxWxD)

203.5 mm x 94.4 mm x 59.0 mm

Weight

U1251B: 504±5 g with battery

U1252B/U1253B: 527±5 g with battery

Warranty

3 years for main unit

3 months for standard accessories unless otherwise specified.

11 | Keysight | U1250 Series Handheld Digital Multimeter - Data Sheet