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Explains the formula to calculate the total specification involving coil and calibrator interaction.
Explains the formula to calculate the total specification involving coil and calibrator interaction.
The Fluke 55XXA/COIL 50 and 55XXA/COIL 10 are current coils designed for calibrating clamp-type current meters, also known as clamp meters. These devices facilitate the calibration of clamp meters that operate on two different principles: as current transformers (for AC only) and via the Hall Effect (for both AC and DC). The primary function of these coils is to effectively multiply the current from a current source calibrator, allowing for the calibration and verification of high-current clamp meters that would otherwise be impractical to test with a direct 1000 A source. For instance, the 55XXA/COIL 50 can multiply the current by a factor of 50, enabling the calibration of 1000 A-rated clamp meters.
The 55XXA/COIL 50 features 50 turns, while the 55XXA/COIL 10 offers 1, 2, or 10 turns.
Maximum Voltage, All Inputs: 30 V to Earth.
Coil Ratio: ±0.65% (includes coil/clamp interaction but not current source errors), DC to 440 Hz.
The total specification of the effective current measured by the clamp meter is a function of both the clamp/coil interaction and the current calibrator. The formula to determine the total specification is: Stotal = √(Scoil² + Usource²) Where Scoil is the specification due to the coil and Usource is the specification of the current calibrator. For example, if a Fluke Calibration 5560A Calibrator supplies 13 A at 60 Hz to the 55XXA/COIL 50, generating an effective current of 650 A (50 x 13 A), 60 Hz, and the calibrator's 1-year specification at 13 A is ±(0.07 % + 8 mA) (equivalent to 0.13% of the 13 A output), the total specification would be calculated by combining the calibrator's 0.13% and the coil's 0.65% specifications. The RSS (Root Sum Square) of these two specifications determines the total specification of the source/coil combination. For higher frequencies or current levels, if the compliance voltage exceeds 1 V, compliance adders must be included in the Calibrator specification.
The 55XXA/COIL devices are designed to provide accurate and repeatable measurements for current clamp calibration. Clamp meters and other current transducers often operate as current transformers, where the magnetic coupling between the primary and secondary varies depending on the meter and its position relative to the cable. This variation can affect the clamp meter's reading.
To ensure the most accurate and repeatable measurements, it is crucial to carefully position the clamp meter on the Coil base according to the markings provided on the Coil.
Calibration accuracy to specifications is guaranteed only with proper clamp alignment. Users should align the clamp meter as much as possible on the base during calibration and verification. If the clamp meter has alignment marks, these marks should be aligned with the center-bundled wire of the Coil.
Users must adhere to safety guidelines to prevent electrical shock, fire, or personal injury.
i: Consult user documentation.▲: WARNING. RISK OF DANGER.▲: WARNING. HAZARDOUS VOLTAGE. Risk of electric shock.CE: Conforms to European directives.The manual does not explicitly detail specific maintenance features for the 55XXA/COIL devices. However, general care and adherence to safety guidelines are implied for maintaining the device's functionality and longevity.
Fluke products are warranted to be free from defects in material and workmanship for one year from the date of purchase. This warranty does not cover fuses, disposable batteries, or damage resulting from accident, neglect, misuse, alteration, contamination, or abnormal operating conditions or handling. Resellers are not authorized to extend any other warranty on Fluke's behalf. To obtain service under warranty, users should contact their nearest Fluke authorized service center for return authorization information and then send the product with a description of the problem.
This warranty is the sole remedy. No other warranties, express or implied (such as fitness for a particular purpose), are provided. Fluke is not liable for any special, indirect, incidental, or consequential damages or losses arising from any cause or theory. This limitation of liability may not apply in states or countries that do not allow the exclusion or limitation of implied warranties or incidental/consequential damages.
General| Brand | Fluke |
|---|---|
| Model | 55XXA/COIL 50 |
| Category | Measuring Instruments |
| Language | English |
