AC LINE MONITORS
Frequency, Voltage & Wiring		  

 
 

LFVM (line frequency & voltage monitor)

Pioneer's AC Line Monitors are for a variety of monitoring/diagnostic applications. Simply plug them into a suitable AC outlet. Depending on the model selected, they will automatically begin to display 1) the line frequency, 2) the line voltage and 3) test the outlet's electrical connections to ensure proper wiring. Additionally, they capture and display the minimum and maximum frequency and voltage values as well as count the number of drops and surges for any length of time monitored.

AC line power integrity cannot be take for granted, especially outside of the united states. Often, problems caused by inconsistent AC frequency, voltages and circuit wiring are overlooked when trouble shooting equipment. Knowing whether your power is in or out of specification can save you valuable time.

The LFVM family detects problems in AC line power, 120/240 volt step-up/step-down transformers, and back-up generators or power supplies.

NOTE: This unit is designed for trouble shooting AC power lines for up to 1 hour, not designed for continuous measurement.

 

Troubleshoot/monitor AC power lines for proper frequency, voltage & wiring

Memory feature stores minimum & maximum values and the number of drops/spikes

Helps to determine whether problem is on AC line or in the equipment

Built-in AC circuit tester (120 volt models)

 

Plant Engineering/Troubleshooting
  • Spot-check or monitor "around the clock" for proper power output and wiring of electrical outlets.
  • Monitor power quality during delicate engineering and laboratory experiments.
  • Monitor AC power when calibrating sensitive equipment.
Manufacturing
  • Verify the output of AC power sources or step-up/step-down transformers used for testing AC-powered equipment manufactured for international markets.
  • Verify the accuracy and stability of AC synchronous motors and clocks.
Foreign/Offshore Power Monitoring
  • Verify the output of foreign or offshore power which is often highly unregulated compared to U.S. standards.
  • Check the output of frequency-regulated and unregulated DC-to-AC invertors.
Emergency Generator Monitoring
  • Monitor the output of emergency, portable and back-up power generators.

 

Specifications

Model LFVM-60+
Display Range & Resolution (Frequency) 40 to 80 Hz; +/- 0.01 Hz
Display Range & Resolution (Voltage) 80 – 140 V; +/- 1.5 V
Wiring Indicators Ground line open, neutral line open, hot line open, hot/ground reversed, hot/neutral reversed, correctly wired
Input Voltage Requirements 80 – 140 VAC @ 60 Hz nominal

All Models
Numerical Display(s) 4 Digit LED; 0.56" high
Statistical Display Parameters Minimum & maximum values; number of drops &spikes
Display Update Intervals 200 milliseconds (five times a second)
Dimensions 2.5" x 4.7" x 1.5", (2.4" to end of plug on 120 V models; 3" on 240 V models)
Weight LFM models: 10.4 ounces LFVM models: 10.6 ounces
Construction High impact plastic
Operating/Storage Environment 32 – 114°F / 0 – 125°F
NOTICE: The LFVM is not designed for continuous measurement (24/7) of AC power, it is only appropriate for AC monitoring over shorter (up to 8 hours) intervals.

 

Diagram
 
1. LED DISPLAY
LFM models display frequency. LFVM models display both frequency and voltage.
2. AC CIRCUIT TESTER
120 volt models include a built-in AC line circuit tester.
See below.

 

Built-AC Circuit Tester
The 120 volt models (LFM-60+ & LFVM-60+) include a built-in AC circuit tester. This tester uses a series of one red and two yellow lights to indicate the status of the power source's electrical wiring. The appropriate lights will turn on and remain illuminated as long as the line monitor remains connected to the power source.

 

Ordering Guide

LFVM-60 $220.00 Line Frequency & Voltage Monitor with built-in AC circuit tester (120 V nominal input)
WARNING! Do not use the LFVM-50+ or LFVM-60+ with an AC outlet suspected of having its hot and ground lines reversed. Doing so may damage the instrument. If in doubt, check the wiring, or test the outlet (120 V) using the LFM-60+