DMS01-AM-RS12-C

**DMS01-AM Series** 

Large Format Digital DC Shunt Ammeter 

## Murata Power Solutions 

## **PRODUCT OVERVIEW** 

DMS01-AM-RS12-C is a robust, highly configurable, digital panel meter that provides precise measurement and display of DC current and supports a wide range of external shunts. DIP switches simplify selection and setup of shunt current / voltage input ranges and features a highly visible red 1” (25mm) tall, 3½ – 4½ digit seven-segment LED display with adjustable brightness. Independent offset and scale adjustment trim-potentiometers optimize precision for specialized applications and the internal digital filter enhances performance in electrically noisy environments. An external 12VDC power source provides power to the meter. An internal DC-DC converter accommodates a ±48V common-mode measurement range with respect to the power supply input and supports both high or low side measurement, simplifying a wide range of measurement applications. This digital panel meter ideal for laboratory instrumentation, factory automation, and any application that requiring precise current monitoring. 

## **Features** 

- Measures ranges of 1A to 1200A 

- 0.2% typical accuracy 

- Supports user selectable 50 or 100 mV external shunts 

- Bright 1” red LED display, readable at ~ 

- distance of 80 feet ( 24 m) 

- Adjustable display brightness 

- Wide common-mode input range (±48V) 

- Digital filter for optimizing measurements in electrically noisy environments 

- Operates from an external 12VDC power supply 

- Mounts with  adhesive strips (supplied) or screws 

|ORDERING INFORMATION|ORDERING INFORMATION|
|---|---|
|DMS01-AM-RS12-C|Digital DC Shunt Ammeter, 1”Red Display, 12VDC Power|



|ACCESSORIES|ACCESSORIES|ACCESSORIES|
|---|---|---|
|Shunts|||
|**Murata Model #**|**Full-scale Amps / Output Voltage**|**Resistance (mΩs at**<br>**25˚C)**|
|3020-01097-0|5A / 50mV|10.0000|
|3020-01107-0|10A / 100mV|10.0000|
|3020-01098-0|20A / 50mV|2.5000|
|3020-01096-0|50A / 50mV|1.0000|
|3020-01099-0|100A / 50mV|0.5000|
|3020-01108-0|100A / 100mV|1.0000|
|3020-01100-0|150A / 50mV|0.3300|
|3020-01101-0|200A / 50mV|0.2500|
|3020-01102-0|300A / 50mV|0.1670|
|3020-01103-0|500A / 50mV|0.1000|
|3020-01104-0|800A / 50mV|0.0625|
|3020-01105-0|1000A / 50mV|0.0500|
|3020-01106-0|1200A / 50mV|0.0417|



## SIMPLIFIED BLOCK DIAGRAM 

**==> picture [100 x 51] intentionally omitted <==**

**----- Start of picture text -----**<br>
COMPLIANT For full details go to  i 25y<br>www.murata-ps.com/rohs<br>**----- End of picture text -----**<br>


**www.murata-ps.com/support** 

DMS01-AM.A01.D06 Page **1** of **7** 

**DMS01-AM Series** 

Large Format Digital DC Shunt Ammeter 

## Murata Power Solutions 

|DC ELECTRICAL CHARACTERISTICS(Typical @ 25C,+12VDC supplyunless otherwise noted)<br>~~CO~~|DC ELECTRICAL CHARACTERISTICS(Typical @ 25C,+12VDC supplyunless otherwise noted)<br>~~CO~~|DC ELECTRICAL CHARACTERISTICS(Typical @ 25C,+12VDC supplyunless otherwise noted)<br>~~CO~~|DC ELECTRICAL CHARACTERISTICS(Typical @ 25C,+12VDC supplyunless otherwise noted)<br>~~CO~~|DC ELECTRICAL CHARACTERISTICS(Typical @ 25C,+12VDC supplyunless otherwise noted)<br>~~CO~~|
|---|---|---|---|---|
|**Parameter**<br>~~CO~~|**Min**<br>~~CO~~|**Typ**<br>~~CO~~|**Max**<br>~~CO~~|**Units**<br>~~CO~~|
|Supply Voltage (Operating)|11|12|13|V|
|Absolute Maximum Supply Voltage|-1||+14|V|
|Supply Current1(Operating at maximum intensity)|||100|mA|
|(Operating at minimum intensity)|||60|mA|
|Digits|3.5 – 4.5<br>Dependent upon  on shunt resistor settings||||
|Digit Height|1 (25.4)|||inch (mm)|
|Display Update Rate||2||Sa/s|
|Decimal Selection|auto||||
|Display Color|Red (627nm pk)||||
|Over-range indication|Flashing display||||
|Measurement range (50mV range)|-50||+50|mV|
|(100mV range)|-100||+100|mV|
|Accuracy||0.2%|1%||
|Zero-Offset            (50mV range)|-2||+2|count|
|(100mV range)|-2||+2|count|
|Current Range Options|See current range selection table||||
|Input Impedance||5G||Ω|
|Offset Trim Range||±1.5||% full-scale|
|Scale Trim Range||±1||%|
|Temperature Drift (0 to +50˚C)||±0.08||count/°C|
|Absolute Maximum Input Voltage (+VIN to-VIN)|-16||+16|V|
|Common-Mode Input Range (-VIN) to (-VS)|-48||+48|V|



1 based on a display value of “1.888” 

|PHYSICAL/ENVIRONMENTAL<br>~~CO~~|PHYSICAL/ENVIRONMENTAL<br>~~CO~~|PHYSICAL/ENVIRONMENTAL<br>~~CO~~|PHYSICAL/ENVIRONMENTAL<br>~~CO~~|PHYSICAL/ENVIRONMENTAL<br>~~CO~~|
|---|---|---|---|---|
|**Parameter**<br>~~CO~~|**Min**<br>~~CO~~|**Typ**<br>~~CO~~|**Max**<br>~~CO~~|**Units**<br>~~CO~~|
|Operating Temperature|0||+50|C|
|Storage Temperature|-40||+75|C|
|Humidity (Non-condensing)|||85|%RH|
|Weight||6.14 (174)||oz (g)|
|User Controls|||||
|Brightness|single-turn potentiometer||||
|Offset and Gain Adjustment|QTY 2 12-turn trim potentiometers||||
|Dipswitches (QTY 2), configuration of:<br>-<br>Input voltage range<br>-<br>Digital filter enable<br>-<br>Current range<br>-<br>Scale and offset trim enable|“S1” and “S2” 6-position each||||
|Overall Dimensions|5.86 (149) L x 3.36 (86) W x 1.43 (37) H|||inch (mm)|
|Terminal Blocks|**Min**|**Typ**|**Max**|**Units**|
|Wire Size|24||14|AWG|
|Insulation Strip Length||0.25 (6)||inch (mm)|
|Screw Tightening torque||56.6 (0.4)||oz-in (N-m)|



**www.murata-ps.com/support** 

DMS01-AM.A01.D06 Page **2** of **7** 

**DMS01-AM Series** 

## Murata Power Solutions| s 

## Large Format Digital DC Shunt Ammeter 

## OPERATION 

## **Measurement Type and Capabilities** 

- The DMS01-AM measures DC current using an external shunt resistor with two user-selectable input ranges of ±50mV and ±100mV. 

- Measurements are displayed between 3-1/2 and 4-1/2 digits of resolution depending on the current range selected. 

- 21 current range options can be selected based on dipswitch settings. 

- The meter’s measurement terminals are electrically isolated from the power terminals through a DC-DC converter, providing a high common-mode input range (±48V) for the input (relative to the power terminals), simplifying a wide range of measurement applications. 

- Meter requires and external 12VDC power supply (not included). 

## REAR PANEL LAYOUT, SCREW TERMINAL CONNECTIONS & CONTROLS 

|Terminal Block|Terminal Block|Terminal Block|
|---|---|---|
|**Terminal #**|**Name**|**Function**|
|1|-VS|Power Supply Terminals (+12VDC)|
|2|+VS||
|3|-IN|Measurement Input Terminals<br>(Shunt Connections)|
|4|+IN||



**Brightness Adjust** – This single-turn potentiometer supports adjustment of the meter’s LED display brightness for maximum readability. Turning the pot clockwise increases brightness, while turning it counterclockwise decreases brightness. 

**Offset Adjust** – This 12-turn potentiometer supports the adjustment of meter offset.  In the vast majority of applications, this function is not needed as the meter’s offset is precisely adjusted to zero at factory calibration. Turning the pot clockwise will give a negative offset, while turning it counterclockwise gives a positive offset. 

**Scale Adjust** – This 12-turn potentiometer supports the adjustment of the meter’s scale.  In the vast majority of applications, this function is 

not needed as the meter’s scale is precisely adjusted at factory calibration. Turning the pot clockwise decreases the gain, while turning it counterclockwise increases the gain. 

**S1, S2** – These two 6-position dipswitches are used to configure the meter’s various options.  Details may be found in the Meter Configuration section of this datasheet. 

**==> picture [93 x 8] intentionally omitted <==**

**----- Start of picture text -----**<br>
CONNECTION EXAMPLES<br>**----- End of picture text -----**<br>


**==> picture [51 x 10] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure 1 & 2<br>**----- End of picture text -----**<br>


The above example illustrates an application where the total load current of the system needs to be measured.  Therefore, the shunt is connected in series with the system load, at the same time, the shunt measurement points connected to terminals 3 & 4, as shown. The potential difference (VDC) across these points is converted and displayed as DC current, and indicates total system load. This is a high-side installation. See Figure 1 & 2 above for and example of low-side installaiton. 

**www.murata-ps.com/support** 

DMS01-AM.A01.D06 Page **3** of **7** 

**DMS01-AM Series** 

## nuMurata RataPower Solutions|Ps 

## Power 

Large Format Digital DC Shunt Ammeter 

|**Current Range**|**S2 **|**S1 **|**S1 **|**S1 **|**S1 **|**DIPSWITCH **|**DIPSWITCH **|**DIPSWITCH **|**DIPSWITCH **|**DIPSWITCH **|**DIPSWITCH **|**Description**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
||**SW1**|**SW3**|**SW4**|**SW5**|**SW6**|**S2 **|||**S1 **||||
|Shunt Input<br>Voltage|OFF|OFF|OFF|OFF|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**||Current Ranges:<br>The ammeter uses 5 switches<br>(SW3 - SW6 on S1 and SW1 on<br>S2) to control the different current<br>range options as shown. If all<br>switches are set to off or if<br>switches are set beyond the<br>1200A range the meter will display<br>the voltage across the shunt.|
|±1.000|OFF|ON|OFF|OFF|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±2.000|OFF|OFF|ON|OFF|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±5.000|OFF|ON|ON|OFF|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±10.00|OFF|OFF|OFF|ON|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±15.00|OFF|ON|OFF|ON|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±20.00|OFF|OFF|ON|ON|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±30.00|OFF|ON|ON|ON|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±50.00|OFF|OFF|OFF|OFF|ON||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±75.00|OFF|ON|OFF|OFF|ON||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±80.00|OFF|OFF|ON|OFF|ON||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±100.0|OFF|ON|ON|OFF|ON||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±150.0|OFF|OFF|OFF|ON|ON||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±200.0|OFF|ON|OFF|ON|ON||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±250.0|OFF|OFF|ON|ON|ON||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±300.0|OFF|ON|ON|ON|ON||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±400.0|ON|OFF|OFF|OFF|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±500.0|ON|ON|OFF|OFF|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±600.0|ON|OFF|ON|OFF|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±800.0|ON|ON|ON|OFF|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±1000|ON|OFF|OFF|ON|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|±1200|ON|ON|OFF|ON|OFF||**ON**<br>**1**<br>**2 3 4 5 6**|||**ON**<br>**1**<br>**2 3 4 5 6**|||
|Shunt Input<br>Voltage|All other positions will show the voltage at the input terminals.||||||||||||



**www.murata-ps.com/support** 

DMS01-AM.A01.D06 Page **4** of **7** 

**DMS01-AM Series** 

Large Format Digital DC Shunt Ammeter 

## Murata Power Solutions 

|METER CONFIGURATION<br>~~Ce~~|METER CONFIGURATION<br>~~Ce~~|METER CONFIGURATION<br>~~Ce~~|METER CONFIGURATION<br>~~Ce~~|
|---|---|---|---|
|Current Range Selection||||
|**Input Range**|**SW1**|**Dipswitch S1 **|**Description **|
|±50mV|OFF|**ON**<br>**1**<br>**2 3 4 5 6**|SW1 on S1 controls the meter’s input range. In the OFF position the<br>input range is ±50mV, while in the ON position the meter’s range is<br>±100mV.|
|±100mV|ON|**ON**<br>**1**<br>**2 3 4 5 6**<br>~~A~~UUUUL||
|Current Range Selection||||
|**Input Range**|**SW1**|**Dipswitch S1 **|**Description **|
|±50mV|OFF|**ON**<br>**1**<br>**2 3 4 5 6**|SW1 on S1 controls the meter’s input range. In the OFF position the<br>input range is ±50mV, while in the ON position the meter’s range is<br>±100mV.|
|±100mV|ON|**ON**<br>**1**<br>**2 3 4 5 6**<br>~~A~~UUUUU||
|Digital Filter On/Off Selection||||
|**Digital Filter**|**SW2**|**Dipswitch S1 **|**Description **|
|OFF|OFF|**ON**<br>**1**<br>**2 3 4 5 6**<br>U~~B~~UUOU|SW2 on S1 controls the meter’s digital filter. In the OFF position, the<br>filter is disabled and readings are updated at maximum speed. In the<br>ON position, the filter is enabled, and readings are processed<br>through a moving average filter, which results in more stable<br>readings, but a slower response.|
|ON|ON|**ON**<br>**1**<br>**2 3 4 5 6**<br>U~~A~~UUUU||
|Scale and Offset Trim Adjust Enable On/Off||||
|**Trim Enable**|**SW2**|**Dipswitch S2 **|**Description **|
|OFF|OFF|**ON**<br>**1**<br>**2 3 4 5 6**<br>~~J~~EU|The DMS01 ammeter provides two potentiometers for adjustment<br>of the measurement scale and offset controls which can be<br>enabled by SW2 on S2. When the switch is set to the OFF position<br>the trim is disabled. When the switch is set to the ON position the<br>trim is enabled.|
|ON|ON|**ON**<br>**1**<br>**2 3 4 5 6**<br>U~~A~~UUUU||



**www.murata-ps.com/support** 

DMS01-AM.A01.D06 Page **5** of **7** 

**DMS01-AM Series** 

Large Format Digital DC Shunt Ammeter 

## Murata Power Solutionss 

## TECHNICAL NOTES 

## **1. Calibration** 

The DMS01-AM is calibrated at the factory at the time of manufacture. When the Trim Enable switch (SW2 on S2) is turned off, the unit ignores the scale and offset potentiometer settings and reverts to factory calibration. When the Trim Enable switch is turned ON, the unit’s effective calibration may be changed by the user and may no longer be within datasheet specifications. 

## **2. Protection and Fusing** 

The DMS01-AM contains an internal PTC fuse as well as other protective elements that are intended for protection against brief electrical transients and misconnect conditions. Additional external protective components such as fuses and transient suppressors may be required depending on the application in which the meter is deployed. 

## **3. Noisy Power Supplies** 

In systems with noisy power supplies, connecting an external, non-polarized capacitor across the +VS and -VS inputs can help reduce measurement errors. In certain situations, the use of twisted pair or shield wiring may be required. 

## **4. Installation** 

IMPORTANT! To ensure safe and reliable operation, DMS01 meters must be installed and serviced by qualified technical personnel. Contact Murata Power Solutions if there is any doubt regarding their installation or operation. 

## **5. Over-range Limit** 

The meter will flash on and off when the input of the meter exceeds its minimum or maximum input voltage/current. 

## PANEL INSTALLATION 

## **PANEL CUTOUT** 

Notes: When mounting panel meter with hardware, a four hole pattern (four outermost holes) or the six hole pattern may be used at the customer’s option. 

**www.murata-ps.com/support** 

DMS01-AM.A01.D06 Page **6** of **7** 

**DMS01-AM Series** Large Format Digital DC Shunt Ammeter 

## Murata Power Solutions 

## MECHANICAL SPECIFICATIONS 

Murata Power Solutions, Inc. 129 Flanders Rd. Westborough, Ma  01581, USA. ISO 9001  and 14001  REGISTERED 

**This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/** 

Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. _**© 2019 Murata Power Solutions, Inc..**_ 

**www.murata-ps.com/support** 

DMS01-AM.A01.D06 Page **7** of **7**