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Calmet

Name: Calmet
Address: Kukułcza 18, Zielona Góra, 65-472, PL
Telephone: +48 68 324 04 56

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Calmet sp. z o.o. The company Calmet Sp. Name Calmet derives from words CALibrators and METrology - the main action's field of Calmet company.

was established in 1989 and since then it has been continuously developing and improving in the design and production of innovative control and measurement intruments for the energy industry. For several years, about 70% of our sale has made export, mainly to EU and Asia countries. Equipment designed and produced by us, are used in many laboratories all over the world using brand many different companies or our own Calmet as well. It is possible thanks to our big experience in designing, production and servicing of new electronics and computers technology devices. Traditionally we specialize in electrical power quantities generating – calibrators of voltages, currents and power. Since 1996 we have also busy with testing electricity meters and power network parameters analysing – meters testers, standard meters and connected with them network parameters meters. Since 2002 we have involved in generating and measuring network quality parameters - calibrators, network quality recorders and analysers. Since 2006 we have been also interested in automation of electro-utility automatic protective equipment testing - relays and modern digital protection. During over 30 years of operation, we have gained the trust of our customers on all continents, and our products are currently used in thousands of pieces around the world. We are open to the needs of our customers, and our primary goal is to provide highly specialized devices and measurement systems at affordable prices with the widest possible support for the customer.

15/10/2026

⚡ New Application Note AN-49 from Calmet!

According to standards such as IEC 62052-11, EN 50470-3, and OIML R 46-2, testing the influence of DC on the AC current circuit for direct connected energy meters is crucial to ensure compliance.
In our latest Application Note, we explain step-by-step how to properly perform the half-wave test using Calmet high-precision calibration equipment. 🔌📊

Key takeaways from the document:
Test Objective: Measuring the error shift under half-wave rectified current conditions at power factors PF=1 and PF=0.5.
Recommended Equipment: Perfect ex*****on with our C300B Three-Phase Power Calibrator, CP11B, or the TS33 / TS41 Automatic Test Systems.

Setup Configuration: Since calibrator current outputs are transformer-based, external low-drop Schottky diodes (such as MBR4045PT in parallel) and a balancing load are utilized.
Practical Insights: Due to power dissipation on the Schottky diodes and voltage drops across connection cables (minimum 4mm2 cross-section recommended), the maximum test current reaches up to ~45 A.

Check out the full Application Note, including detailed connection diagrams, harmonic analysis.

👉 Read the full application note on our website!

�https://www.calmet.com.pl/images/pdf/AN49-EN-Energy-meter-half-wave-test.pdf

Technology

08/10/2026

⚡ How to test 4-quadrant energy meters effectively and automatically? ⚡

With the rapid growth of renewable energy sources such as photovoltaic systems and wind farms, bidirectional energy flow is becoming a standard in power grids. Testing 4-quadrant meters requires forcing active power (P+,P-) and reactive power (Q+,Q-) flow across all combinations and directions.

Application Note No. 20 presents a step-by-step guide for complete, automatic testing of such meters using the Calmet TS33 three-phase calibration system.

🔍 Key topics covered in the material:
Standard requirements: Measurements performed in accordance with IEC62053 and EN50470 standards across a current range from 1% to 120% In for various power factors.

Configuration and connection: Principles of connecting the meter and defining parameters (Meter Type) separately for active energy (imp/kWh) and reactive energy (imp/kvarh).
Automatic procedures (Autotest): Creating and saving test point sequences, monitoring test ex*****on time, and evaluating errors automatically in real time.

Flexible result management:
Printing test results directly on-site using a wireless thermal printer.
Data transmission to a PC (via USB, Bluetooth, Ethernet, or SD card) and analysis in TS PC Soft.

Data export to XML / Excel formats and automatic generation of error characteristic charts =f(Iload).

Automating test procedures with the TS33 reduces measurement time and eliminates the risk of configuration errors.

👉 Read the full application note on our website!

�https://www.calmet.com.pl/images/pdf/AN20-EN-2023-04-Testing_4-quadrant-energy-meter-by-TS33-Automatic-Test-System.pdf

01/10/2026

⚡ How to test current transformers efficiently and precisely? ⚡

Current transformers (CTs) are a crucial component of electrical energy measurement systems, and their accuracy directly impacts overall measurement reliability. Looking to optimize CT testing in your laboratory or field operations? 🛠️

Discover the capability of Calmet C300B and CP11B calibrators!
Traditional CT testing requires a primary current source as well as a secondary current and phase displacement meter. Our calibrators integrate both functions into a single, high-precision solution.

🔍 Key Features & Capabilities:
Powerful Primary Current Source: Provides up to 360 A with the 3-phase C300B calibrator and up to 120 A with the single-phase CP11B.
High-Precision Built-in Meter: Measures secondary current up to 6 A with 0.05% uncertainty and phase shift with 0.1° accuracy.
IEC 60044-1 Compliance: Test CT ratio errors and phase displacement across accuracy classes from 0.1 to 1.0.

Full Automation via Calpro300 PC Software:
⚙️ Easily set nominal parameters and custom test procedures for any load test points (% Ipn).
🟢🔴 Auto Test Mode: Instant pass/fail evaluation (green = within tolerance, red = out of class).
📊 Graphs & Test Reports: Visual presentation of error curves across current ranges and automatic test report generation.
Streamline your current transformer testing with automated precision! 🚀

📄 Read the complete Application Note AN36 on our website:
🌐https://www.calmet.com.pl/images/pdf/AN36-EN-2024-03-Current-transformer-testing-by-C300B--CP11B.pdf

24/09/2026

⚡ Automate your energy meter testing with the Calmet TS33 System! ⚡

Looking for a reliable, three-phase automatic test system for comprehensive electricity meter testing? The Calmet TS33 is engineered for precision and fully automated measurements.

With the TS33, key testing procedures are executed in just 3 simple steps (meter declaration, procedure setup, and autotest ex*****on):
🚀 Start-up Current Test – Automatically applies nominal voltage and starting current according to standard requirements.
⚙️ No-load / Creep Test – Verifies meter behavior under zero-current conditions with current outputs in STB mode.

Why choose the TS33 Test System?
🔹 Acts as a three-phase voltage & current source combined with a precision reference meter.
🔹 Features an intuitive graphical interface on a color touchscreen.
🔹 Seamlessly connects with the ER10H.3 quick-connection test rack and CF106H universal photohead.
🔹 Saves all test results directly to an internal SD memory card.
🔹 Dedicated TS PC-Soft software enables easy PC data transfer, professional test report generation, and MS Excel export.

Take your laboratory's testing efficiency and repeatability to the next level! 🛠️

👉 Contact us or visit our website to learn more: www.calmet.com.pl
📩 [email protected]

31/08/2026

Does a larger test benches always mean higher testing efficiency? Not necessarily! 💡⚡

How long does a full test of an energy meter actually take?
The answer depends on multiple factors: accuracy class, meter constant, number of load points, and standard requirements (such as IEC, EN/MID).
Surprisingly, no-load and starting current tests usually take up the most time!

In our latest Application Note AN22, we analyze the testing workflow step by step:
🔹 Breakdown of actual test duration for different meter types.
🔹 Comparison between theoretical calculations and real-world measurement results.
🔹 How mounting time and optical head alignment affect daily lab throughput.

Key takeaway?
Efficiency isn't just about having the biggest bench—it's about optimizing the workflow. A well-sized multi-position test station (like a 5-position setup) can easily handle dozens of meters per shift, providing 100% of the required output while saving lab space and energy consumption.

📖 Read the full application note on our website to explore the complete data and formulas!
https://www.calmet.com.pl/images/pdf/AN22-EN-2023-04-Efficiency-of-test-bench-station-in-meter-testing.pdf

👉 www.calmet.com.pl
📩 [email protected]

18/08/2026

🔌 Could a few meters of cable spoil your CT/PT measurement accuracy results? ⚡

Current transformers (CT) and voltage transformers (PT) are engineered to maintain their accuracy class (e.g., 0.2) within a strictly defined secondary burden range.

But what actually happens in practice when the transformer is located several meters away from the energy meter? 🤔

Copper connecting wires introduce resistance (Rw), generating additional power losses. Over longer distances (e.g., 10–15 m), the voltage drop and power dissipation in the wiring can push the total burden beyond the transformer’s rated power (Sn).

⚠️ The consequence?
Exceeding ratio and phase angle error limits, directly leading to revenue metering errors!

💡 The trap of measuring at energy meter terminals.
When measuring burden directly at the energy meter terminals, it is easy to draw misleading conclusions:

- Simply measuring the power consumed by the meter might suggest the installation is operating normally (e.g., burden at 59% of Sn).
- However, once you factor in wire resistance (Rw = 0.017xl / ∅) and project the burden at nominal current (%S@n), you may discover the transformer is actually operating in an overloaded condition (>100% Sn)!

🛠️ How to prevent this?
Use reference testing equipment with built-in CT/PT burden analysis capabilities (such as our TS33 three-phase test system).
It enables you to:

1. Measure actual power S and evaluate it against rated power Sn in real time,

2. Predict nominal burden (%S@n)—even when the system is not operating at full load and most importantly

3. Take into account the power losses in the cables connecting the energy meter to the transformer, in the case of measuring the transformer's burden at the energy meter terminals instead of at the transformer terminals

📖 Explore full formulas, connection diagrams, and practical test cases in our Application Note AN-28:
https://www.calmet.com.pl/images/pdf/AN28-EN-2023-11-Interpretation-of-CT-PT-burden-measurement-results.pdf

👉 www.calmet.com.pl

📩 [email protected]

21/07/2026

At Calmet, we know how crucial precision and reliability are in the power industry. ⚡

For years, we have specialized in designing and manufacturing advanced measuring equipment. Our solutions enable accurate testing, calibration, and verification of electricity meters – both in laboratory and field conditions.

In the picture, you can see one of our setups in action. We create equipment that engineers can rely on every single day. 🛠️

Discover our full range of capabilities and efficient measurement solutions on our website:
👉 www.calmet.com.pl

📩 [email protected]

15/07/2026

⚡ One device. Multiple applications. Exceptional accuracy.

In calibration laboratories, utility companies, and industrial testing environments, precision, efficiency, and automation are essential.
The Calmet CP11B is a single-phase power calibrator and electrical test instrument designed to simplify the calibration and testing of a wide range of electrical measurement devices.

It enables:
✅ Calibration of AC voltmeters, ammeters, wattmeters, power quality analyzers, and other electrical measuring instruments.
✅ Automated testing of electricity meters in accordance with EN 50470, IEC 62052, IEC 62053, and ANSI C12 standards.
✅ Verification of transducers, current transformers, and protection relays.
✅ Generation of both sinusoidal and non-sinusoidal signals, including harmonics, interharmonics, voltage dips, swells, interruptions, and flicker.
✅ Manual operation or fully automated testing using Calpro300 software.

Key features:
🔹 Output voltage up to 560 V
🔹 Output current up to 120 A
🔹 Accuracy class of 0.02% or 0.05%
🔹 Large touchscreen interface with the ability to perform numerous tests directly from the instrument—no PC required.

Designed for professionals who demand high accuracy, versatility, and reliable performance, the Calmet CP11B delivers an all-in-one solution for calibration, verification, and power quality testing.
Want to learn more about this new feature? Get in touch with us!

📩 [email protected]
💻 www.calmet.com.pl

09/07/2026

Setting a new standard of precision in your laboratory! ⚡
Meet the C300B Three-Phase Power and Energy Calibrator.

If you are looking for uncompromising accuracy when testing energy meters, power quality analyzers, transducers, or wattmeters, the C300B is a true game-changer. It allows you to generate three-phase voltages up to 3x560V and currents up to 3x120A (up to 360A in single-phase connection!) with accuracy class of 0.02% or 0.05%.

What does this mean in practice?
🕒 Full Automation – Automatic energy meter testing with error calculation and impulse counting.
📈 Power Quality Analysis – Programming of harmonics up to the 63rd order, interharmonics, and higher frequencies up to 500Hz.
🛠️ Versatility – Comprehensive testing of protection relays (overcurrent, directional, frequency, and more).
💼 Mobility & Convenience – Housed in a compact, rugged transport case, making it perfect for both laboratory and field operations.

Automate your measurements and gain full confidence in every single result. Learn more about the C300B from our data sheet! 👇
Want to learn more about this new feature? Get in touch with us!

📩 [email protected]
💻 www.calmet.com.pl

24/06/2026

We are pleased to introduce a new feature of the Calmet TS33 Test System.

The TS33 has been equipped with two pulse inputs, enabling simultaneous testing of active and reactive power at the same time. This makes measurements faster, more efficient, and more convenient in practical applications.

The new functionality improves the testing process and expands the diagnostic capabilities of the device.

See how it works in practice in the video below.
Want to learn more about this new feature? Get in touch with us!

📩 [email protected]
💻 www.calmet.com.pl

Adres

Kukułcza 18
Zielona Góra
65-472

Godziny otwarcia

Poniedziałek	07:00 - 15:00
Wtorek	07:00 - 15:00
Środa	07:00 - 15:00
Czwartek	07:00 - 15:00
Piątek	07:00 - 15:00

Telefon

+48 68 324 04 56

Strona internetowa

http://www.calmet.com.pl/

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