ACM20 Series
Four-Function AC Power Meters
Performance/Functional Specifications
Typical at TA=+ 25ºC, 120Vac @ 60Hz, unless otherwise noted
Measurement Limits
AC Voltage
AC Current, 32A models
➀
AC Current, 100A models
➀
Active Power: 32A models
Active Power:
100A models
Frequency
Power Factor
Overcurrent Rating
➁
Performance
Sampling Rate
Voltage Accuracy
➂
Current Accuracy
➂
Power Accuracy
➂
Frequency Accuracy
➂
Power Factor Accuracy
Measurement Bandwidth
Temperature Drift (0 to 60ºC)
Zero-Current Reading (within 2 sec.)
Zero-Power Reading (within 2 sec.)
Supply Voltage (TB1)
All Models – 47-63 Hz
Supply Current
➃
All Models
Power Supply Terminal Block
Wire Size
Insulation Strip Length
Screw Tightening Torque
Rated Voltage
Display
Display Type and Size
Overrange Indication
Decimal Point Selection
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
Dimensions
Weight: 32A models
Weight:
100A models
0
–40
0
–
–
–
+60
+75
85
°C
°C
%
4 Digit LED, 9.14mm (0.36in) high
Flashing ‘9999’
Automatically Set
16-22AWG, solid or stranded
6.4mm (0.250 in)
0.4Nm (3.6 lb-in)
300Vac
35
50
110
mA
85
120
264
Vac
2-3 samples / sec
±1%
±1%
±2%
±0.1
±3%
140Hz (Voltage), 14kHz (Current)
0.5 Counts/ºC
0.00
0
Amps
Watts
Hz
Min.
85.0
0.00
0.0
0
0
47.0
.00
Typ.
-
-
-
-
-
-
1.00
Max.
264.0
32.00
100.0
9999
26.4
63.0
-
Units
Volts
Amperes
Amperes
Watts
kW
Hz
-
ORDERING INFORMATION
ACM20-4-AC1-R-C
ACM20-5-AC1-R-C
ACM20-4-AC1-R-F-C
ACM20-5-AC1-R-F-C
100A, 85-264Vac Supply (Power Factor Reading)
32A, 85-264Vac Supply (Power Factor Reading)
100A, 85-264Vac Supply (Frequency Reading)
32A, 85-264Vac Supply (Frequency Reading)
TECHNICAL NOTES
IMPORTANT!
To ensure safe and reliable operation, ACM20 power
meters must be installed and serviced by qualified technical person-
nel. Contact Murata Power Solutions if there is any doubt regarding
their installation or operation.
1. Measurement Type:
ACM20 series multi-function AC power meters
employ a precision energy metering integrated circuit and a low-
power microcontroller to measure and display the rms voltage and
current, active(real) power, power factor (or line frequency on ‘–F’
suffix models) of ac mains supplies from 47-63Hz. Please note,
ACM20 power meters use the voltage present at their TB1 terminal
block and the secondary current of their built-in current transformer
L1 to calculate and then display VOLTS, WATTS, power factor (PF), or
line frequency on ‘-F’ HERTZ models.
2. Basic Operation:
Upon application of ac power to TB1, the unit will
first perform a self-test routine and then continuously display ac volts
with the VOLTS LED annunciator illuminated. The display will remain
in the VOLTS mode as long as the front panel 'SEL' button is not
touched.
After the unit powers up to normal operation in the VOLTS reading
mode, momentarily (approximately one second) touching the ‘SEL’
button on the unit’s front panel three times in succession will cycle
the display to AMPS, WATTS, and end at PF (or HERTZ for ‘–F’ mod-
els). Momentarily touching ‘SEL’ a fourth time will return the display
back to the VOLTS reading mode.
Holding the 'SEL' button down for 3 seconds will place the unit in a
continuous auto-cycling mode, and the display will repetitively scroll
through all four measurements, with each measurement remaining
displayed for 3 seconds.
When the continuous auto-cycling mode is initially selected, the unit
will briefly display ‘Auto On’ before continuous cycling begins. Mo-
mentarily touching the ‘SEL’ button again will cause the unit to briefly
display ‘Auto OFF’ before it returns to the fixed VOLTS reading mode.
3. Calibration:
Due their digital design, ACM20 power meters cannot be
calibrated in the field. ACM20 power meters are factory-calibrated to
meet their specified accuracies with the supplied L1 current trans-
former. Use of any other current transformer will produce significant
errors for the Amps, Watts, and Power Factor measurements.
Contact Murata Power Solutions if additional information is required
regarding calibration, setup, or any other technical issue pertaining to
ACM20 power meters.
1.5 x rated full-scale current
See mechanical specifications
1.3oz (37.9g)
1.5oz (43.5g)
①
Specified full-scale currents are those passing through the power meter’s built-in current
transformer’s primary load-circuit.
➁
The overcurrent rating of 1.5 x the rated full-scale current is a continuous rating and applies
to the current passing through the built in current transformer. Accuracy is guaranteed up to
the rated current.
➂
ACM20 Power Meters are calibrated with near full-scale 60Hz sine-wave inputs.
➃
All specified maximum supply currents are steady state; larger surge currents can occur at
initial application of line power.
www.murata-ps.com/dpm
email: sales@murata-ps.com
08 Oct 2009 MPM_ACM20 Series.A03
Page 2 of 6
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
