Main technical indicators: 0.001S grade ; 0.002 grade.

Current Sensor: (0.1~5000) A/5A, 1A.

Voltage sensor: primary voltage 35kV and below.

Main Functions: Detection of current sensors, voltage sensors.

The COM1003/COM3003(DC) is the latest addition to ZERA's lineup of high-precision measurement equipment. 

It is designed in the same style as the ZERA devices and can be adapted to the latest application requirements.

Depending on the application, you can choose between the single comparator COM1003 or the triple comparator COM3003 (DC).

Due to its high accuracy and stability, the device is suitable for use in metrology institutes, 

laboratories of power supply companies and energy meter manufacturers, and is capable of measuring national and international energy standards.

Translated with DeepL.com (free version).

- High accuracy independent of measurement mode.

- Perfect long term stability.

- Application of DC-coupled current sensors.

- PTB (German National Institute of Weights and Measures) approved for a two-year inspection period.

- Convenient control via 6.4” color LCD and pushbuttons on the panel.

  Computerized control and evaluation of the tests and printing of reports via Windows application program SMM 3000.

- RS232 and IEEE488 interfaces are available.

- SCPI compatible with IEEE488 interface commands.

- Single terminal current input.

- Direct connection to standard DC sources and standard frequency generators for traceability.

  Translated with DeepL.com (free version).

Manual Operation:

The COM1003/ COM3003(DC) Comparator can be operated manually by applying the 6.4”color LCD display and control buttons on the front panel.

The following functions can be performed:

- Actual value measurement.

- Accuracy check of energy meters.

- Accuracy check of standard energy meters.

- Comparison with other standards.

Operation with application software:

The SSM 3000 control software supplied with the device is an application program that runs on the MS WINDOWS 95/98/NT4...platform. 

The SSM 3000 control software supplied with the device is an application program that runs on MS WINDOWS 95/98/NT4... platform.

It greatly extends the functionality of the COM1003/COM3003 (DC).

Actual values are displayed:

The following parameters are displayed in various forms (summary view, meter view, vector graph, etc.) 

and the displayed values are the average values over a customizable integration time:

- RMS values of currents and voltages and their DC components for each phase.

- the phase angle between all voltages and currents.

- the active, reactive and apparent power of each phase and of the whole, as well as their power factors.

- Phase sequence direction and frequency.

Accuracy check:

You can connect the high-frequency output of a standard energy meter to the frequency input of the COM1003/COM3003(DC) to conveniently complete the inspection of a standard meter. 

You can also connect the optical scanner head directly to COM1003/COM3003(DC) for inspection of various types of wall-meters. 

Inspection can be performed manually or automatically.

All test results are automatically saved to a CF card (there is a CF card slot on the front panel).

The test data stored in the CF card can be sent to a computer using the supplied CF card reader. 

You can use the SSM3000 software to analyze the test results and print the report in various formats or export it to MS Excel file.