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:
씰
Alternating Voltage and Frequency (VOLT/FREQ.)
씰
Voltage only (VOLTAGE)
씰
Frequency only (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.
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
Description
Class II, Pollution Degree 2, Measurement Category II
Environmental
Conditions
Indoor use
Altitude up to 2000 M
Temperature: 5°C to 40°C
Maximum Relative Humidity 80%
Protected by Patent No. US 7,164,273,B2
AECM20020 Instructions_r4-08:Layout 1 4/15/08 3:49 PM Page 1
