03 | Keysight | U1240 Series Handheld Digital Multimeters - Data Sheet

Test Confidently and Efficiently

Harmonics ratio

Regular maintenance to keep the production line running seamlessly is the ultimate goal

for industrial test engineers. In real life there is the presence of harmonics due to many

electronic devices powered by switched mode current pulses that travels back into the

power source. If these unwanted harmonics become too large, they have unwanted side

effects: overheating that shortens the lifespan of motors, generators and transformers;

premature tripping of circuit breakers; and blown fuses. Hence an accurate, dependable

U1240C Series DMM helps to ensure early detection of harmonics in the AC supply. 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.

The U1240C Series offers a fast one-button check with its harmonic ratio function. The

ratio percentage helps you to decide if further analysis of the power source is required

with an oscilloscope or a spectrum analyzer.

Low impedance mode

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

improves safety and measurement efficiency during voltage measurement.

Vsense for non-contact voltage detection

The U1240C Series handheld DMM have Vsense — 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 voltage, it

produces a unique combination of beeping alert and blinking LED light to alert users.

This feature is especially useful to make measurements more efficiently in dark or noisy

environment.