Keysight U1242B Handheld Digital Multimeter, 4 Digit

Keysight U1242B Handheld Digital Multimeter, 4 Digit

10K counts digital multimeter with switch/relay counter, harmonic ratio and dual/differential

 temperature functions for installation and maintenance troubleshooting

HIGHLIGHTS

▶Better viewability with dual-intensity backlighting

▶Detect glitches swiftly with built-in switch/relay counter

▶Detect harmonics in AC supply with the Harmonic Ratio function

▶Monitor differential temperature points on HVAC systems with the T1-T2 function

▶Log measurements easily to PC or mobile device (requires U1179A IR connectivity bracket)

▶CAT III 1000 V and CAT IV 600 V Overvoltage Protection

What is included:

▶Standard 3-Year Warranty (90 days for un-serialized accessories)

▶Test Lead Set

▶Quick Start Guide

▶4 x 1.5 V Batteries

▶Certificate of Calibration

Key Features 

▶10,000-count display 

▶Up to 0.09% basic DCV accuracy 

▶Longer battery life up to 400 hours 1 

▶Certified to IP 67 for water and dust protection 1 

▶Tested to withstand a 3-meter (10-ft) drop 1 – CAT III 1000 V / CAT IV 600 V overvoltage protection  

▶Special features:  

   o Harmonic ratio  measurement to quickly identify the presence of harmonics in AC signals 

   o ZLOW, low impedance mode 2 to eliminate false readings caused by stray voltages 

   o Vsense 2 for non-contact voltage detection 

   o T1 – T2 differential temperature 2 measurement 

   o Built-in flashlight 3 

Harmonics ratio 

In real life, harmonics are present in AC power due to the fact that many electronic devices are powered 

by switched-mode current pulses which travel back into the power source. If these unwanted harmonics 

become too large, the undesirable side effects include overheating that shortens the lifespan of motors, 

generators, and transformers, premature tripping of circuit breakers, and blown fuses. One of the fastest 

ways to detect and gauge the percentage of distortion due to harmonics is by measuring the harmonic 

ratio of the incoming AC voltage. You can perform this very easily on the U1242B/C handheld DMM, with 

just a button press. The percentage helps you to decide if further analysis of the power source is required 

with an oscilloscope or a spectrum analyzer. 

Low impedance mode (Zlow) 

Stray voltages are usually encountered in non-energized electrical wiring adjacent to powered wires due 

to capacitive or inductive coupling between these wires. The low impedance mode helps to reduce false 

readings by dissipating these stray voltages, thus improving safety and measurement efficiency during 

voltage measurement. 

Vsense for non-contact voltage detection 

Vsense is a unique method of non-contact voltage detection that safeguards users from exposure to hot 

or live wires while making measurements in dangerous working environments. Upon detection of high AC 

voltage, it produces a unique combination of beeping audio and blinking LED lights to alert users.

Dual and differential temperature 

In the installation, maintenance, and troubleshooting of heating, ventilation, and air-conditioning (HVAC) 

systems, temperature measurements are essential. As an example, to ensure boiler temperature adheres 

to safety requirements, you would need to measure both boiler and air temperature simultaneously to 

achieve accurate real-time readings. With a faulty air conditioning system, viewing the temperature 

difference between the warm return air and cool air supply helps to reveal the cooling behavior of the 

evaporator with respect to time. Now with the convenience of the U1242B/C DMM, you need only one 

instrument to efficiently get dual and differential measurements. 

Built-in flashlight with ergonomics in mind 

Designed for handheld users working in poorly lit environments, the U1240C Series fits comfortably in 

your palm, allowing you to single-handedly illuminate the test area with its easily activated built-in LED 

flashlight. With ergonomics in mind, you can swiftly make more measurements without straining your 

hands even over a longer period of time.