Fluke 378FC AC/DC TRMS Non-Contact Voltage Wireless Clamp Meter User Manual

1. Introduction

The Fluke 378FC is a True-RMS AC/DC clamp meter designed for faster and safer electrical testing. It features FieldSense™ technology for non-contact voltage and current measurements, eliminating the need to touch live conductors. This meter also includes a unique Power Quality (PQ) indicator to detect issues related to current, voltage, or power factor. The 378FC integrates with the Fluke Connect app for remote monitoring and data logging.

Figure 1: Front view of the Fluke 378FC clamp meter, displaying its large LCD screen, rotary dial, function buttons, and red clamp jaws. The screen shows a reading of 13.7 Aac and 234 Vac.

2. Safety Information

Always adhere to local and national safety codes. Use personal protective equipment (PPE) to prevent shock and arc blast injury. Read and understand all safety instructions before using the Fluke 378FC. This device is rated for CAT III 1000V and CAT IV 600V.

• Do not use the meter if it is damaged or operating abnormally.
• Ensure test leads and probes are in good condition before use.
• Always connect the black test lead to a suitable electrical ground when using FieldSense™ technology to ensure accurate voltage readings.
• Do not apply more than the rated voltage, as marked on the meter, between the terminals or between any terminal and earth ground.
• Use caution when working with voltages above 30 V AC RMS, 42 V peak, or 60 V DC. These voltages pose a shock hazard.

3. Product Overview

Key Features

• Measure voltage and current with the clamp jaw using FieldSense™ technology.
• Faster, safer testing without touching a live wire.
• Complete 3-phase voltage and current tests with fewer steps.
• Power quality indicator shows whether equipment or power line is faulty (378 FC model).
• True-RMS for accurate measurements on non-linear loads.
• Wireless connectivity with Fluke Connect app.

What's in the Box

• Fluke 378FC Clamp Meter
• Test Leads and Probes
• Grounding Clip
• TPAK Magnetic Hanger Strap
• Carrying Case
• iFlex Flexible Current Probe

Figure 2: An overhead view showing all components included with the Fluke 378FC: the clamp meter, a black carrying case, red and black test leads, a grounding clip, a TPAK magnetic hanger strap, and the iFlex flexible current probe.

4. Setup

4.1 Battery Installation

The Fluke 378FC requires two (2) AA batteries, which are included. To install or replace batteries:

1. Ensure the meter is turned OFF.
2. Locate the battery compartment cover on the back of the meter.
3. Use a screwdriver to loosen the screw(s) securing the cover.
4. Remove the cover and insert the AA batteries, observing correct polarity.
5. Replace the cover and tighten the screw(s).

4.2 Connecting Test Leads and iFlex Probe

For standard voltage, resistance, and continuity measurements, insert the red test lead into the VΩ input jack and the black test lead into the COM input jack. For current measurements using the iFlex flexible current probe:

1. Ensure the meter is turned OFF.
2. Connect the iFlex probe's connector to the dedicated iFlex input jack on the meter.
3. Securely fasten the iFlex probe around the conductor to be measured.

Figure 3: The Fluke 378FC clamp meter with the iFlex flexible current probe connected to its input jacks. The iFlex probe is coiled next to the meter, ready for use in tight spaces.

5. Operating Instructions

5.1 FieldSense™ Non-Contact Voltage and Current

FieldSense™ technology allows for voltage and current measurements without direct contact with live conductors, enhancing safety.

1. Turn the rotary dial to the FieldSense™ position (indicated by the symbol).
2. Connect the black test lead to a reliable electrical ground point.
3. Place the clamp jaw around the conductor you wish to measure.
4. The display will show the voltage and current readings.

5.2 True-RMS AC/DC Measurements

The 378FC provides True-RMS measurements for accurate readings on both linear and non-linear loads.

• Voltage (V): Select the V∼ (AC) or V— (DC) setting. Connect test leads in parallel with the circuit.
• Current (A): Select the A∼ (AC) or A— (DC) setting. Open the clamp jaw and place it around a single conductor. For iFlex, ensure it is properly connected and wrapped around the conductor.
• Resistance (Ω): Select the Ω setting. Ensure the circuit is de-energized. Connect test leads across the component.
• Continuity: Select the continuity setting. Ensure the circuit is de-energized. Connect test leads across the circuit or component. An audible tone indicates continuity.

5.3 Power Quality (PQ) Indicator

The PQ indicator helps identify power quality issues. When activated, it monitors for anomalies in current, voltage, or power factor.

1. Turn the rotary dial to a measurement function that supports PQ (e.g., FieldSense™).
2. Press the PQ button to activate the indicator.
3. The meter will display an indication if power quality issues are detected.

5.4 3-Phase Measurements

The 378FC simplifies 3-phase voltage and current measurements. Refer to the on-screen prompts or the Fluke Connect app for guided measurements.

5.5 In-rush Current Logging

The in-rush current logging feature captures the initial surge of current when equipment starts up, which is crucial for motor troubleshooting.

1. Select the In-rush function on the meter.
2. Initiate the equipment startup. The meter will automatically capture and display the peak in-rush current.

5.6 Fluke Connect App Integration

The Fluke 378FC can connect wirelessly to the Fluke Connect mobile app, allowing for remote viewing, data logging, and sharing of measurements.

1. Download and install the Fluke Connect app on your compatible smartphone.
2. Enable Bluetooth on your smartphone and the 378FC.
3. Pair the meter with the app following the on-screen instructions.
4. Use the app to view live readings, log data, and generate reports.

Figure 4: An electrician, wearing safety gloves and a face shield, uses the Fluke 378FC clamp meter to measure current on a conductor inside an open electrical panel. The meter's display shows a reading of 97.1 A and 119.6 V.

Figure 5: An electrician, wearing safety gear, views data from the Fluke 378FC clamp meter on a smartphone using the Fluke Connect app. The clamp meter is attached to an electrical panel in the background.

6. Maintenance

6.1 Cleaning

To clean the meter, wipe it with a damp cloth and mild detergent. Do not use abrasives or solvents. Ensure the meter is dry before storage or use.

6.2 Battery Replacement

Replace batteries when the low battery indicator appears on the display. Refer to Section 4.1 for battery installation instructions.

6.3 Calibration

For optimal performance and accuracy, periodic calibration by an authorized service center is recommended. Refer to Fluke's official website or contact customer support for calibration services.

7. Troubleshooting

• Meter does not power on: Check battery installation and ensure batteries are not depleted.
• Inaccurate FieldSense™ readings: Ensure the black test lead is properly connected to a good electrical ground.
• No display or erratic readings: Replace batteries. If the issue persists, contact Fluke customer support.
• Fluke Connect app connectivity issues: Ensure Bluetooth is enabled on both devices and that the meter is within range. Refer to the Fluke Connect app's help section.

For further troubleshooting or technical assistance, please contact Fluke customer support.

8. Specifications

9. Warranty and Support

9.1 Warranty Information

Fluke products are warranted to be free from defects in material and workmanship under normal use and service. The specific warranty period for the Fluke 378FC is detailed in the warranty card included with your product. Please retain your proof of purchase for warranty claims.

9.2 Customer Support

For technical support, service, or repair, please visit the official Fluke website or contact their customer service department. Contact information can typically be found on the Fluke website or in the documentation provided with your meter.