Keysight / Agilent / HP U1272A Handheld Digital Multimeter

The Keysight U1272A is a 4.5-digit handheld digital multimeter engineered for field and bench electrical measurements across utility, industrial, and service environments. Its 30,000-count dual display with analog bar graph delivers true RMS readings at up to 7 readings per second, supported by 10,000-point internal data logging and 300-hour battery life. The unit combines rugged IP54 design with CAT III 1000 V and CAT IV 600 V safety ratings for demanding fieldwork.

## Technical Specifications

**Voltage & Current Measurement**
• DC voltage: 30 mV to 1000 V, ±0.05% basic accuracy
• AC voltage: 30 mV to 1000 V, 45 Hz to 65 kHz bandwidth
• DC current: 300 µA to 10 A with tiered overload protection
• AC current: 300 µA to 10 A, 45 Hz to 2 kHz standard bandwidth

**Resistance, Capacitance & Frequency**
• Resistance: 30 Ω to 300 MΩ with Smart Ω offset compensation
• Capacitance: 10 nF to 10 mF
• Frequency: 99.999 Hz to >1 MHz
• Temperature (thermocouple): −200 °C to 1372 °C, J and K type

**Additional Functions**
• Auto-diode testing with continuity beeper
• dBm and dBV measurements with selectable impedance
• Peak detect captures transients to 250 µs
• Low-pass filter for variable frequency drive troubleshooting
• Smooth function for stable reading output

## Key Features

**ZLOW Function:** Nominal 2 kΩ input impedance eliminates ghost and stray voltages through coupling dissipation—critical for precision work on high-impedance circuits.

**Smart Ω:** Offset compensation removes false readings from DC bias and leakage current, improving accuracy on in-circuit resistance measurements.

**Peak Detect:** 250 µs capture bandwidth isolates transient events in switched power systems and industrial controls.

**Low Pass Filter:** Attenuates harmonics and high-frequency noise for valid measurements across variable frequency drives without spectral distortion.

## Typical Applications

• Field service and preventive maintenance on three-phase industrial equipment
• Commissioning and troubleshooting of VFD-driven motor circuits
• In-circuit resistance and capacitance diagnostics on PCBs with active biasing
• Temperature monitoring via thermocouple interface
• Data logging of slow transients with 10,000-point memory

## Connectivity & Integration

Optional wireless connectivity via U1177A Bluetooth adapter and U1173A IR-USB cable enables remote data logging and PC integration for test documentation and trend analysis.