Fieldpiece Clamp Meters Description
Fieldpiece Clamp Meters
Fieldpiece Clamp Meters are designed with HVACR professionals in mind. Special features are incorporated into Fieldpiece clamp meters that make HVACR work easier. Features include 180 degree swivel clamp meter heads for easier access to difficult areas, built-in clamp LED lights, wireless measurement capabilities, True RMS for exceptional accuracy, and auto-ranging for faster readings.
In addition to these helpful features, Fieldpiece offers clamp meters that allow for modular expandability. What this means is that you only need to purchase one Fieldpiece stick meter, which is essentially a standalone digital multimeter but with the capability to connect to various measurement attachments. Rather than purchase multiple meters, you can then use a clamp meter head attachment like the Fieldpiece ACH4 on your stick meter and it effectively becomes a clamp meter. With this system you only need one meter. Attachments are affordable and small, which saves space in your toolbox since you don't need multiple meters.
This short video from Fieldpiece will help you visualize modular expandability and its numerous benefits.
How to buy/choose a Fieldpiece Clamp Meter
Choose a clamp meter that gives accurate and repeatable results.
Fieldpiece offers a variety of clamp meters with True RMS measurement. Clamp meters with True RMS measurement are extremely accurate. Without True RMS, noise from everything from a variable frequency drive to compact fluorescent bulbs can result in a less accurate reading. Fieldpiece also offers autoranging clamp meters that allow for quick and accurate measurements.
Consider Fieldpiece Wireless Clamp Meters
Fieldpiece offers a wireless clamp meter capable of transmitting wireless readings from up to 75 feet away from the meter. This meter works by using a detachable wireless current clamp head similar to those mentioned above concerning modular expandability. However, because this meter is wireless it saves you additional time. Rather than running back and forth from measurement to adjustment points you can now stay in one place while doing both. Wireless meters also improve accuracy because they give technicians real-time readings while adjustments are being made.
Make sure the clamp meter does what you need
Fieldpiece meters feature large, blue backlit displays so you can always see what your meter is reading regardless of environment. Additionally, Fieldpiece clamp meters are extremely capable when it comes to variable measurement. Certain meters are capable of measuring Temperature (°C and °F), Frequency (Hz), Duty Cycle (%), Capacitance (MFD), Resistance (Ω), Continuity, Voltage (AC), Amperage (AC), Clamp Frequency (Hz), Voltage (DC), Non-contact Voltage (NCV), and Micro-amps (DC).
Clamp meters and adaptors measure this field using one of two technologies. For DC currents, "Hall Effect" is used, while for AC currents "Inductive" technology is used. Hall effect and induction are noncontact technologies based on the principle that for a given current flow, a proportional magnetic field is produced around the current-carrying conductor. Both technologies measure this magnetic field, but with different sensing methods.
How does a clamp meter work?
Hall Effect Technology
The Hall effect sensor consists of three basic components: the core, the Hall effect device, and signal conditioning circuitry. The current conductor passes through a magnetically permeable core that concentrates the conductor's magnetic field. The Hall effect device is carefully mounted in a small slit in the core, at a right angle to the concentrated magnetic field. A constant current in one plane excites it. When the energized Hall device is exposed to a magnetic field from the core, it produces a potential difference (voltage) that can be measured and amplified.
The ability of clamp meters to measure large ac currents is based on simple transformer action. AC current constantly changes potential from positive to negative and back again, generally at the rate of 50 Hz or 60 Hz. The expanding and collapsing magnetic field induces current in the windings. This is the principle that governs all transformers. When you clamp the instrument’s “jaws” around a conductor carrying ac current, that current is coupled through the jaws, similar to the iron core of a power transformer, and into a secondary winding which is connected across the shunt of the meter’s input. A much smaller current is delivered to the meter’s input due to the ratio of the number of secondary windings vs. the number of primary windings wrapped around the core.
Usually, the primary is represented by the one conductor around which the jaws are clamped. If the secondary has 1000 windings, then the secondary current is 1/1000 the current flowing in the primary, or in this case the conductor being measured. Thus, 1 amp of current in the conductor being measured would produce 0.001 amps or 1 milliamp of current at the input of the meter. With this technique, much larger currents can be easily measured by increasing the number of turns in the secondary.
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