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PM120
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USER
MANUAL
PM120
–
Power
Monitor
Introduction
Thank
you
for
selecting
the
Extech
PM120
Power
Meter.
The
PM120
monitors
and
records
power
usage
of
home
and
work
appliances
for
energy
conservation
and
cost
reduction
analysis.
The
power
meter
measures
the
voltage,
current,
power,
and
power
factor
as
well
as
total
time,
cost,
and
energy.
The
PM120
is
equipped
with
a
high
‐
precision
current
sensor
giving
real
‐
time
monitoring
of
AC
power
supply
units.
It
features
an
alarm
and
power
cut
‐
off
for
safety.
This
device
is
shipped
fully
tested
and
calibrated
and,
with
proper
use,
will
provide
years
of
reliable
service.
Please
visit
our
website
(www.extech.com)
to
check
for
the
latest
version
and
translations
of
this
User
Manual,
Product
Updates,
Product
Registration,
and
Customer
Support.
Features
Large
dual
LCD
manually
displays
electrical,
cost,
and
metering
functions
in
real
‐
time.
Electrical
safety
transfer
function
when
connecting
this
product
to
a
socket
and
then
plugging
the
electrical
appliance
into
this
product.
Over
‐
current
warning
function.
Primary
LCD
shows
voltage,
current,
power,
power
factor,
or
frequency.
Secondary
display
shows
total
time,
cost,
set,
or
energy.
Enter
electric
charge
(cost
setting)
to
calculate
and
display
kWh.
Display
cost
of
operation
in
minute,
hour,
day,
and
week.
Battery
backup
stores
data
when
removed
from
outlet.
Three
prong
standard
US
plug
and
front
socket
for
easy
connection.
Safety
Information
To
ensure
the
safe
operation
and
service
of
the
meter,
follow
these
instructions
closely.
Failure
to
observe
warnings
can
result
in
severe
injury.
WARNINGS
WARNINGS
identify
hazardous
conditions
and
actions
that
could
cause
BODILY
HARM
or
DEATH.
Check
the
housing
for
cracks
or
missing
plastic
especially
surrounding
the
plug.
Do
not
use
if
any
part
of
the
meter
is
damaged.
Verify
the
meter’s
operation.
Do
not
use
if
the
meter
responds
abnormally
as
the
internal
structure
may
be
damaged.
Use
the
meter
only
as
specified
in
this
User
Guide
or
accompanying
Quick
Start
to
avoid
compromising
the
protections
provided
by
the
meter.
Do
not
exceed
the
rated
power
or
current
of
this
meter.
Do
not
expose
the
meter
to
extremes
in
temperature
or
to
high
humidity.
Keep
this
meter
away
from
children.
Do
not
use
the
meter
in
the
presence
of
explosive
gas,
vapor
or
dust.
To
reduce
risk
of
fire
or
electric
shock,
do
not
use
the
meter
if
it
is
wet
and
do
not
expose
the
meter
to
moisture.
Meter
Description
1.
Primary
Display:
See
↑
M
for
functions.
2.
Secondary
Display:
See
↓
M
for
functions
3.
↓
M:
Cycles
through
secondary
display
functions:
Total
Time,
Cost,
Energy
and
the
corresponding
values
of
each
selection.
4.
↑
M:
Cycles
through
primary
display
functions:
Voltage,
Current,
Power,
Power
Factor,
Frequency
and
the
corresponding
values
of
each
selection.
5.
Appliance
outlet
6.
SET:
Long
press
to
set
the
cost
in
$/kWh
7.
+/RESET:
Short
press
to
increase
the
digits.
Long
press
to
reset
the
Energy
or
Cost
functions.
Short
press
to
wake
the
power
monitor
from
sleep
mode.
Operation
Measurement
Plug
the
PM120
into
a
household
socket
to
being
measuring.
The
display
will
power
on
and
enter
default
measurement
display
(Voltage
and
Total
Time).
Select
the
Mode
Short
press
the
↑
M
button
to
scroll
through
primary
display
functions.
The
meter
will
cycle
through
Voltage,
Current,
Power,
Power
Factor
and
Frequency.
Long
press
↑
M
to
return
to
default
‘Voltage’
mode.
Short
press
the
↓
M
button
to
scroll
through
secondary
display
functions.
The
meter
will
cycle
through
Total
Time,
Cost,
and
Energy.
Long
press
↓
M
to
return
to
default
‘Total
Time’
mode.
Total
Time
Check
the
time
by
pressing
the
+/RESET
button.
If
the
accumulated
time
is
less
than
1
day,
only
Hour
and
Min
will
display.
If
the
accumulated
time
exceeds
1
day,
the
LCD
will
only
display
‘Day’.
To
view
the
hour
and
minute
display,
short
press
the
+/RESET
button.
Total
Time
in
Days
Total
Time
in
Hour:Min
Total
Time
since
power
ON
Note:
If
the
meter
is
above
the
rated
current,
the
display
will
show
a
warning
in
the
primary
display
and
OL
in
the
secondary
display.
Both
displays
and
the
power
light
will
flash.
Warning
Icon
and
Overload
Power
OFF
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