dms-20rm Murata Manufacturing Co., Ltd, dms-20rm Datasheet - Page 2

• Manufacturer Part Number: dms-20rm
• Description: True-rms Ac Voltmeters With Isolated Inputs
• Manufacturer: Murata Manufacturing Co., Ltd

Performance/Functional Specifi cations
Typical at TA=+ 25ºC with 60Hz sine-wave input, unless otherwise noted
➀ Specifi ed accuracy applies to inputs with crest factors (CF) up to 2.0, where CF = Vpeak/Vrms.
Crest factors of 2 to 5 introduce an additional error of ±3% of full scale. Voltmeters are calibrated
with a near full-scale, 60Hz sine-wave input.
➁ Specifi ed maximum power supply currents are steady state; larger surge currents can occur at
initial application of power.
Full-Scale Input Voltage (TB2)
DMS-20RM-1
DMS-20RM-2
DMS-20RM-3
Frequency Range
Performance
Sampling Rate
Accuracy ➀
Measurement Type
Temperature Drift (0 to 60ºC)
Zero-Volt Reading (within 30 sec.)
Breakdown Voltage, TB1 to TB2
Power Supply Voltage (TB1)
DMS-20RM-X-AC1
DMS-20RM-X-DC2
Power Supply Current (TB1, ➁)
DMS-20RM-X-AC1
DMS-20RM-X-DC2
Terminal Block Wiring (TB1 and TB2)
Wire Size
Insulation Strip Length
Screw Tightening Torque
Rated Voltage
Display
Display Type and Size
Overrange Indication
Decimal Point
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
Dimensions
Weight:
2000
-001
+10.0
Fixed, model dependent (see full-scale input
Min.
-25
-40
47
Model dependent; see product datasheet.
0
0
0
85
—
—
0
rms responding, Crest Factors of 1-5
3½ Digit LED, 0.37”/9.4mm high
1.3 Ounces (36 grams) nominal
16-22AWG, Solid or stranded
with 60Hz sine wave input
3.6 pound-inches (0.4Nm)
www.murata-ps.com/dpm
2.5 reading per second
±0.2
±0.4%FS ±2 counts
Typ.
000
—
—
—
—
—
—
—
—
—
60
30
10
voltage above)
0.250 inches
“1___”
300Vac
+40.0
19.99
199.9
1000
Max.
±0.4
+60
+75
300
001
264
—
50
15
85
Vac/47-63Hz
mA/47-63Hz
mAdc
Counts/ºC
Counts
Units
Vac
Vac
Vac
Vdc
Vdc
Hz
ºC
ºC
%
True-rms ac Voltmeters with Isolated Inputs
ORDERING INFORMATION
DMS-20RM-1-AC1-R-C
DMS-20RM-2-AC1-R-C
DMS-20RM-3-AC1-R-C
DMS-20RM-1-DC2-R-C
DMS-20RM-2-DC2-R-C
DMS-20RM-3-DC2-R-C
A DMS-BZL4-C bezel assembly with sealing gasket is supplied with each meter.
IMPORTANT!
voltmeters must be installed and serviced by qualifi ed technical personnel.
Contact Murata Power Solutions if there is any doubt regarding installation
and/or operation.
TECHNICAL NOTES
1. Measurement Type: DMS-20RM series ac voltmeters employ a preci-
2. Wiring: All power supply and input signal wiring must be rated for the
3. Power Supply Polarity, Fusing, and Grounding: As shown in Figures
4. Calibration: Periodic recalibration of DMS-20RM voltmeters is not
sion rms-to-dc converter and a high-precision voltage reference to
measure and display the rms value of complex ac waveforms. Please
note, the rear-mounted potential transformer is used to isolate the
input signal being measured (TB2) from the ammeter’s operating power
source connected to TB1. Do not pass any conductors through this
transformer’s center hole as this will introduce signifi cant measure-
ment errors.
voltages and currents they will carry and must comply with any code
or application-mandated requirements pertaining to the user’s specifi c
installation.
1A and 1B, the two power supply inputs, TB1-A and TB1-B, on ac-pow-
ered DMS-20RM voltmeters (“-AC1” suffi x) are not polarity sensitive,
that is, they have no “AC LO” or “AC HI” designations. Also, ac-powered
models do not include or require a connection to earth/chassis ground.
DC-powered models (‘-DC2’ suffi x) are reverse-polarity protected, and
must be connected as shown in Figure 2 for proper operation.
DMS-20RM ac voltmeters are not internally fused. If fusing is required
it must be externally installed according to the supply wire’s maximum
amperage rating.
required under normal, indoor operating environments. If calibration is
necessary, it should only be performed by qualifi ed technical personnel.
Calibration is performed with potentially lethal voltages applied to the
DMS-20RM and its associated wiring. A plastic, fully-insulated adjust-
ing tool must be used to access the recessed calibration potentiometer
located on the back of the unit (see Mechanical Specifi cations). Contact
Murata Power Solutions if additional information is required regarding
calibration, setup, or any other technical issue pertaining to DMS-20RM
ac voltmeters.
To ensure safe and reliable operation, DMS-20RM ac
Technical enquiries email: [e-mail], tel:
DMS-20RM Series
0 to 19.99Vac, AC Powered
0 to 199.9Vac, AC Powered
0 to 300Vac, AC Powered
0 to 19.99Vac, DC Powered
0 to 199.9Vac, DC Powered
0 to 300Vac, DC Powered
MPM_DMS-20RM.A03 Page 2 of 4
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