| 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. |