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Digital Line Monitor

Catalog Item # 24900
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Digitally monitor and meter all your AC power sources for your personal safety and appliance protection.
This compact, easy to use instrument is made with advanced microelectronics and provides accurate testing and monitoring of electrical outlets and systems. Constantly monitors voltage and frequency indicating potential improper polarity and ground wiring. Its small size and rugged construction allows for convenient installation in an electrical outlet or use as a portable service tool.

Voltage is measured as RMS which is much more precise than AC average. RMS metering is the only method that can accurately measure all AC power sources. The RMS voltage and frequency readings are ideal for monitoring modified sine waves such as solid-state generators, inverters and Uninterruptible Power Supply (UPS) products.

The Digital Monitor display will alternate between line voltage in RMS volts and line frequency in Hertz. The LCD display shows an "F" in front of the reading to denote frequency. Pressing the MODE button on the front of the Digital Monitor will cycle through the display modes. Both voltage and frequency are constantly monitored regardless of the display mode.

  • Fully tests incoming power for: Open ground, Reverse polarity, High/Low voltage
  • Three display modes available: Alternating voltage and frequency (VOLT/FREQ.), Voltage only (VOLTAGE),Frequency only (FREQUENCY)
  • Accurate testing and monitoring of all AC power source types
  • RMS voltage and frequency meter
  • Multi-tone fault alarm
  • Hands-free auto reset
  • Advanced microelectronics
  • One-button operation
  • Wiring diagnostics
  • LCD display with LED backlight

  • Technical Specs

    Tech Specs

    Weight: Less than 1 lb.

    Manufacturer: Southwire

    Mfg Part #: AECM20020-012

    Tech Notes:

  • Voltage range 85 to 150 Vac RMS
  • Frequency range 40/80 Hz
  • Operating current 0.02 Amp
  • Under voltage alarm <102 Vac RMS
  • Over voltage alarm >135 Vac RMS
  • Under frequency alarm <55 Hz
  • Over frequency alarm >65 Hz
  • Outlet type 120V/15A single phase
  • Operating temperature range +32?F to +125?F

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    Digital Line Monitor: Customer Reviews

    Camper's Choice Rating

    (5 Based on 16 Reviews)

    Reviewed by 16 customers


    Visual piece of mind

    195 out of 202 people found this review helpful.
    October 10, 2003
    This little guy constantly monitors incoming power and alerts you to high or low voltage conditions as well as incorrect line frequency. It will also alarm if the wiring is miswired (reversed polarity) or no ground line is present. I leave one plugged in whenever we're camped and a quick glance at the display lets me know if how much line voltage we've got in the camper. More piece of mind.
    Was this review helpful? Yes / No

    120 Volt meter

    198 out of 206 people found this review helpful.
    May 18, 2004
    This voltmeter can tell you a lot. If it reads below 105 VAC then shut off your air conditioner. If the voltage climbs by more than 5 VAC when the compressor cycles off, there is a problem with your generator voltage regulator, or if you are plugged in, the receptical you are plugged into is worn out - the clips inside of it are not holding tightly to your RV cord. This will cause the cord to overheat, and low voltage is bad for your air conditioner compressor. If you are below 105 VAC even with the air conditioner off, you need to increase the voltage before re-starting the air conditioner. When running on the generator, check the Hertz. If it is not 60, + or - 1 HZ, then have the generator checked out. You can read my posts on RV.Net Golden HVAC
    Was this review helpful? Yes / No

    Worth the Price

    0 out of 0 people found this review helpful.
    April 06, 2009
    So far, this monitor has identifed several low voltage conditions in various campgrounds, has identified a pedistal that had lost its ground, and has identifed that one of the extension cords that I was using had lost its ground. All of these are potentially dangerous conditions. The display is large enough and clear enough, but quite frankly I wonder if I would have noticed that there was a serious problem without the built-in alarm that went off each time. There are lower priced monitors, but none of them have the features that this one has. It is well worth the price.
    Was this review helpful? Yes / No

    Q & A

    Product Question & Answer

    5 questions : 5 answers
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    Display usage?
    1 answer(s)
    Can this be used to test for problems at the post before connecting?
    1 answer(s)
    Does it monitor polarity?
    1 answer(s)

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