TRC AECM20020 User manual
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 construc-
tion allows for convenient installation in an electrical outlet or use as a portable service tool.
INSTALLATION
The AECM20020 Digital Monitor is for use in a standard 120V/15A outlet. It is suitable for continu-
ous or occasional use.
The viewing angle of the LCD display is optimized for viewing at a 12:00 o’clock viewing position.
Looking directly at or down at the unit while mounted in a low outlet gives the best viewing contrast.
The 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.
OPERATION
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.
There are three display modes available:
씰Alternating Voltage and Frequency (VOLT/FREQ.)
씰Voltage only (VOLTAGE)
씰Frequency only (FREQUE CY)
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.
When the Digital Monitor detects a fault condition the fault LED comes on immediately upon fault
threshold being exceeded. If the fault threshold is exceeded and sustained for three seconds it sounds
an audible alert for 5 seconds and shows the cause for the fault on the display. The wiring faults are
Open Ground (GF) and Polarity Fault (PF). The voltage faults are Low voltage (Lo) of 102 Vac or lower
and High voltage (HI) of 135 Vac or higher. The frequency faults are Low Frequency (LF) of less than
55 Hz and High Frequency (HF) of over 65 Hz. Fault reset thresholds must be obtained to re-enable
the fault alarms. When a wiring fault (GF) or (PF) is displayed, the MODE button may be used to
sequence the display to show the current voltage or frequency by successive button actuations.
For ground and wiring faults, consult a qualified electrician for correction.
CAUTION
Dangerous conditions may exist if not used in accordance with these instructions.
Equipment protected by Double Insulation.
STORAGE
When not in use the Digital Monitor should be stored in a dry location out of direct sunlight.
DIGITAL MONITOR OPERATING INSTRUCTIONS
MODEL AECM20020
RATING MINIMUM TYPICAL MAXIMUM
Voltage range 85 Vac RMS 120 Vac RMS 150 Vac RMS
Frequency range 40 Hz 60 Hz 80 Hz
Operating current 0.02 Amps
Power rating 2.0 Watts
Under voltage alarm 102 Vac RMS
Over voltage alarm 135 Vac RMS
Under frequency alarm 55 Hz
Over frequency alarm 65 Hz
Operating temperature 0° C 60° C
Storage temperature -45° C 85° C
Descriptio Class II, Pollution Degree 2, Measurement Category II
E viro me tal
Co ditio s
Indoor use
Altitude up to 2000 M
Temperature: 5°C to 40°C
Maximum Relative Humidity 80%
Protected by Patent o. US 7,164,273,B2
AECM20020 Instr ctions_r4-08:Layo t 1 4/15/08 3:49 PM Page 1
TRC WARRANTY
TRC warrants that its devices are free from defects in materials and workmanship for a
period of one year from the date of original purchase.
This one year warranty is in lieu of all other warranties, obligations, or liabilities expressed
or implied by the company. Any properly installed device that proves defective in normal use
will be repaired or replaced at TRC’s option provided the unit is returned through an authorized
TRC dealer or representative or shipped directly to:
Sales Department
Technology Research Corporation
5250 140th Avenue orth • Clearwater, Florida 33760
The product should be properly packaged and shipped postage prepaid.
Please enclose the following:
Proof of purchase, including date of purchase.
An explanation of the defect or failure and a return address.
Warra ty is void if the device has bee ope ed, altered, misused a d/or abused i a y way.
TRC cannot assume responsibility for customer alterations, acts of God, or any other
factors not under the control of TRC.
TRC cannot assume responsibility for damage in handling of shipment.
TRC shall have no responsibility for installation of this device or for any personal injury,
property damage, any incidental, contingent, or consequential damages of any kind resulting in
defects or failure of the unit to function in the event of a ground fault in the circuit.
Implied warranties (if any) including but not limited to implied warranties of fitness for a
particular purpose and merchantability, are limited in duration to a period ending one year from
the date of original customer purchase. The exclusive remedy for breach of the limited
warranty contained herein is the repair or replacement of the defective product at TRC’s option.
In no case shall TRC’s liability under any other remedy prescribed by law exceed the purchase
price. Some states do not allow the exclusion or limitation of incidental or consequential
damages or allow disclaimers or modifications of or limitation on how long an implied warranty
lasts, so the above limitations may not apply to you. This warranty gives you specific legal
rights and you may also have other rights which may vary from state to state.
Technology Research Corporation
5250 140th Avenue orth • Clearwater, Florida 33760
(727) 535-0572
3000-04-08RB90864B
AECM20020 Instr ctions_r4-08:Layo t 1 4/15/08 3:49 PM Page 2
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