JEMStar II High Accuracy Revenue Meter


The AMETEK Power Instruments’ JEMStar II High Accuracy Revenue Meter is your cash register. Fractions of a percent accuracy can mean the difference of hundreds of thousands of dollars. Our precision design provides high accuracy with long term stability, making it easy to guarantee a 0.05% accuracy for 10 years. When compared to other meters, the JEMStar II can provide more than $13,000 per year in unaccounted revenue.


With a variety of ways you can customize the JEMStar II, the meter can be utilized for simple revenue and billing applications as well as more complex power quality monitoring applications. We can equip the JEMStar II with up to seven communication ports including an internal 4G LTE cell modem. The JEMWARE Configuration Software is so easy to use that most can learn the basics of configuring the meter in one hour of training and after a full day, you can gain enough expertise to build your own configurations. The JEMStar II can be provided in socket, switchboard, A-base and several retrofit packages for easy plug and play of replacement legacy meters.


Ask us about this item

  • Brand
  • Key Features & Benefits
  • Ease of Use
  • Security
  • Communications
  • Real-Time Site Monitoring and Notifications
  • Power Quality
  • Power Quality Recordings
  • JEMStar II Retrofit
  • Data Sheets


Ametek Power

Key Features & Benefits

  • High accuracy – 0.05% for 10 years
  • NERC CIPS Compliant – Secure access and audit logs for all access attempts
  • 1 GB of non-volatile memory to store metering and power quality data
  • Graphic color display, totalization via digital inputs and remote test mode
  • Advanced communications and alarms
  • Six-channel digital input/output and four-channel Analog input/output
  • Flexible design – Easily replaces many legacy meters
  • CAISO, ERCOT and NYPSC approved

Ease of Use

Utilizing the JEMWARE software, the meter can be switched to a remote test mode. Test mode is always available through the meter display or users can be given access to this option based on user rights that are controllable within the software.

The JEMStar II also offers totalization via digital inputs which allows the user to sum the measurements of several different meters. This process is completed through the connection of digital I/Os of the meters. The user is then allowed to combine the load profile, registers and measurement log of up to 16 meters in any combination.


JEMStar II includes DLMS protocol, which not only requires a client ID and password for access to the meter, but also includes three different account levels that enable the user the following options:

  • Read only
  • Read and set the date and time with approved password
  • Read all DLMS objects and logos with approved password


With the ability to have up to seven communication ports, the tracking of the port status and protocol selections is simplified with our graphical ‘heads-up display’ on the meter, which shows; which ports are installed and configured, which are in use and which require attention. The two independent Ethernet ports have separate IP addresses so end users can allow access to third parties without breaching their own secure network. Each Ethernet port can be addressed for multiple users and protocols operating simultaneously with permissions given to specific functions. The 4G LTE internal Cell Modem can support up to eight simultaneous connections using different communication protocols.

Real-Time Site Monitoring and Notifications

The meter site can be monitored for outages, power quality anomalies and any change in your power. Real-time alarm notification is provided using web-based JSON messages. The site data can be fed into ‘cloud based’ applications moving you into the Internet of Things (IoT) world. Metering wiring connections can be checked at the meter via color phasor diagram and alert you when wiring is mis-connected or phase angles exceed preset limits. The phasor display can also be viewed remotely utilizing our JEMWARE software.

Additionally within the meter software, email notifications can be sent for events such as triggers, battery status, time synchornizations and more. These are fully configurable, with options to send periodically or in live time.

Power Quality

The JEMStar II is equipped with Sag/Swell/Outage recordings that store the time, date, duration and site conditions. For advanced power quality analysis, there is an option to record high-speed RMS measurements and waveform data from pre-selected triggers. Continuous recording of harmonics, flicker and other power measurements are provided in the 400 channel log with enough memory to store several months of data. Power quality data resides in a PQDIF file format on the meter. It can automatically be exported for easy analysis with our software or third-party applications. 

Power Quality Recordings

Sag/Swell/Outage (Standard)
  • Record Event Time, Date, Duration
  • Record phase that triggered
  • Record Min/Max/Avg V, A, Pf, THD
 High Speed RMS (Optional)
  • Record voltage and current per phase
  • 120 Hz Recording Rate
  • Configurable Trigger: Pre and post event recording, max 60 second recording per event
 Waveform Capture (Optional)
  • Record voltage and current phase
  • 16 Samples/Cycle Recording Rate: Max 960 cycles recording per event
  • 128 Samples/Cycle Recording Rate: Max 240 cycles recording per event
  • 512 Samples/Cycle Recording Rate: Max 30 cycles recording per event
  • Configurable Trigger: Pre and post event recording
 Harmonic Recording (Optional)
  • Record individual voltage and current harmonic per phase up to 64th
  • Record magnitude and phase angle
 Flicker Measurement (Optional)
  • Pst and Plt
  • Pinst (instantaneous)
 Measurement Log (Optional)
  • 8 logs of 50 measurements each
  • Recording Interval: 150/180 cycles to 120 minutes
  • Min/Max/Avg Measurements
Trigger Selections (used for alarm logging and PQ recording)
  • Sag/Swell
  • Transient Trigger
  • Rapid Voltage Change
  • Interruptions
  • THD, TDD, Flicker
  • Phase Loss, Phase Rotation
  • Any instantaneous measurement (over/under)
  • Digital Inputs

JEMStar II Retrofit

We’ve designed our JEMStar II to fit into an existing legacy meter enclosure (short or tall) and connect to the existing wiring for a plug and play replacement option. This takes the hassle out of finding a way to fit your new meter into an existing cutout and the extra time to update your drawings and rewire the meter. Utilizing our retrofit offers you the many advanced features that were not available on previous models and can save you more than $1,000 when compared to the cost of installing new meters. Our retrofit is available on the following meters:

  • SCI JEM2, JEM10 and JEMStar
  • GE DS63, DSW63, DS64, DSW64
  • Quantum Q121, Q220
  • TransData MarkV
  • L&G Quad4
  • Westinghouse D2B, D4B

To learn more about our retrofit options, download our brochure or contact us to discuss your needs.

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