Voltage Problem Loggers

Use this guide when you need to prove whether a supply voltage problem is causing equipment faults, high energy use, nuisance trips, resets, poor performance or voltage optimisation concerns.

Voltage problems are often intermittent. A spot reading may look normal, while the useful evidence is hidden in the minimum, maximum and average voltage recorded over hours, days or weeks.

When to investigate voltage

  • Equipment trips, resets, locks out or behaves unpredictably.
  • Lights flicker, motors run hot, UPS systems transfer unexpectedly or controls reset.
  • You suspect high voltage, low voltage, voltage imbalance or supply variation.
  • You need evidence before contacting a supplier, landlord, facilities team or contractor.
  • You want to check voltage before and after voltage optimisation work.

What to measure

  • Live-neutral, phase-phase or three-phase voltage over time.
  • Minimum, maximum and average voltage.
  • Voltage dips, rises, interruptions and long-term variation.
  • Where relevant, current and load behaviour at the same time as voltage.

Recommended loggers

Electrocorder EC-7VAR-RS Three Phase Voltage, Current & Power Factor Recorder

EC-7VAR-RS: Electrocorder EC-7VAR-RS Three Phase Voltage, Current & Power Factor Recorder

Use when voltage needs to be analysed alongside current, power factor, load and energy behaviour.

Electrocorder EC-3V Three Phase Voltage Recorder

EC-3V: Electrocorder EC-3V Three Phase Voltage Recorder

Use for three-phase voltage recording where you need to compare phases over time.

Electrocorder SL-3V Compact Three Phase Voltage Recorder

SL-3V: Electrocorder SL-3V Compact Three Phase Voltage Recorder

Use where a compact three-phase voltage recorder is easier to install or leave in place.

Electrocorder EC-2V Voltage Logger

EC-2V: Electrocorder EC-2V Voltage Logger

Use for single-phase live-neutral and earth-neutral voltage comparison.

Electrocorder EC-1V (Mailable) Voltage Recorder

EC-1V: Electrocorder EC-1V (Mailable) Voltage Recorder

Use for simple single-phase voltage recording, including customer supply checks.

Electrocorder LS-1V Interruption Voltage Logger

LS-1V: Electrocorder LS-1V Interruption Voltage Logger

Use when the key question is whether voltage disappeared, and exactly when interruptions occurred.

How to choose

  • Start with EC-1V for straightforward single-phase voltage checks.
  • Choose EC-2V when earth-neutral comparison may help diagnose wiring or supply behaviour.
  • Choose EC-3V or SL-3V for three-phase voltage monitoring.
  • Choose LS-1V when interruption timing matters more than detailed voltage level analysis.
  • Choose EC-7VAR-RS when voltage needs to be understood alongside current, power factor, load and energy.

Useful reading

Need help choosing?

If you are not sure which voltage logger is best for the site, contact us with the supply type, symptoms and what you are trying to prove.