1. Introduction
The Fluke 302+ Digital Clamp Meter is a compact and user-friendly tool designed for basic electrical troubleshooting. It offers reliable measurements for AC current, AC/DC voltage, resistance, continuity, and capacitance, making it suitable for a variety of applications where True-RMS accuracy is not a primary requirement.
Image 1.1: Front view of the Fluke 302+ Digital Clamp Meter, displaying its clear LCD screen and rotary dial.
2. Safety Information
To ensure safe operation and prevent electric shock or personal injury, always adhere to the following safety guidelines:
- Read and understand all instructions before using the meter.
- Do not use the meter if it appears damaged or if the test leads are damaged.
- Verify the meter's operation on a known voltage source before use.
- Adhere to local and national safety codes.
- Always use the meter within its specified measurement categories and voltage/current limits. The Fluke 302+ has a CAT IV 300 V / CAT III 600 V safety rating.
- Wear appropriate personal protective equipment (PPE), such as safety glasses and insulated gloves, when working with electrical circuits.
- 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.
- Remove test leads from the meter before opening the battery compartment.
3. What's in the Box
Upon unpacking your Fluke 302+ Digital Clamp Meter, ensure all the following items are present:
- Fluke 302+ Clamp Meter
- Fluke TL75 Hard Point Test Leads (one red, one black)
- Two AA batteries (pre-installed or included separately)
- User Manual (this document)
- 2-year manufacturer warranty information
Image 3.1: The Fluke 302+ Clamp Meter shown alongside its red and black TL75 test leads.
4. Setup
4.1. Battery Installation
The Fluke 302+ requires two AA batteries for operation. These are typically included. If batteries need replacement or initial installation:
- Ensure the meter is turned OFF.
- Locate the battery compartment cover on the back of the meter.
- Use a screwdriver to loosen the screw securing the cover.
- Remove the cover and insert the two AA batteries, observing correct polarity (+ and -).
- Replace the battery compartment cover and tighten the screw securely.
4.2. Connecting Test Leads
For voltage, resistance, continuity, and capacitance measurements, connect the test leads as follows:
- Insert the black test lead into the COM (common) input jack.
- Insert the red test lead into the VΩCAP input jack.
5. Operating Instructions
The Fluke 302+ features a rotary dial to select measurement functions. Always ensure the meter is set to the correct function before making a measurement.
5.1. AC Current Measurement (Clamp)
To measure AC current up to 400 A using the clamp jaw:
- Turn the rotary dial to the ∽A (AC Current) position.
- Open the clamp jaw by pressing the lever.
- Encircle only one conductor with the clamp jaw. Ensure the jaw is fully closed.
- Read the AC current value on the display.
Image 5.1: The Fluke 302+ Clamp Meter measuring AC current on a blue electrical conductor within a panel.
5.2. AC/DC Voltage Measurement
To measure AC or DC voltage up to 600 V:
- Connect the test leads as described in Section 4.2.
- Turn the rotary dial to the V∽ (AC Voltage) or V— (DC Voltage) position.
- Touch the test probes to the test points of the circuit.
- Read the voltage value on the display.
5.3. Resistance Measurement
To measure resistance:
- Connect the test leads as described in Section 4.2.
- Turn the rotary dial to the Ω (Resistance) position.
- Ensure the circuit under test is de-energized.
- Touch the test probes across the component or circuit to be measured.
- Read the resistance value on the display.
5.4. Continuity Measurement
To check for circuit continuity:
- Connect the test leads as described in Section 4.2.
- Turn the rotary dial to the Ω (Resistance) position and press the 'HOLD' button to cycle to continuity mode (indicated by a speaker icon).
- Ensure the circuit under test is de-energized.
- Touch the test probes across the circuit or component.
- The meter will beep if continuity is detected (low resistance).
5.5. Capacitance Measurement
To measure capacitance:
- Connect the test leads as described in Section 4.2.
- Turn the rotary dial to the CAP (Capacitance) position.
- Ensure the capacitor is fully discharged before measurement.
- Touch the test probes across the capacitor terminals.
- Read the capacitance value on the display.
5.6. Data Hold Function
Press the HOLD button to freeze the current reading on the display. Press it again to release the hold function.
5.7. Backlight
Press the backlight button (indicated by a light bulb icon) to illuminate the display for better visibility in low-light conditions. Press it again to turn off the backlight.
6. Maintenance
6.1. General Care
Keep the meter dry. If it gets wet, wipe it dry. Keep the meter away from dust and dirt. Wipe the meter with a damp cloth periodically. Do not use harsh chemicals, cleaning solvents, or strong detergents.
6.2. Battery Replacement
When the battery symbol appears on the display, replace the batteries immediately to ensure accurate readings. Refer to Section 4.1 for battery installation instructions.
6.3. Fuse Replacement
The Fluke 302+ does not contain user-replaceable fuses for its measurement functions. If the meter malfunctions, contact Fluke customer support.
7. Troubleshooting
If the meter does not operate correctly, check the following:
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter does not power on. | Dead or incorrectly installed batteries. | Replace batteries, ensuring correct polarity. |
| No reading or 'OL' (Overload) displayed. | Incorrect function selected, open circuit, or measurement exceeds range. | Select correct function, check circuit connections, or ensure measurement is within meter's range. |
| Inaccurate readings. | Low battery, dirty test leads, or external interference. | Replace batteries, clean test leads, or move away from strong electromagnetic fields. |
| Continuity function does not beep. | Open circuit or high resistance. | Check circuit for breaks. The beep indicates low resistance. |
8. Specifications
| Feature | Specification |
|---|---|
| Model | Fluke 302+ |
| AC Current Range | 0.1 A to 400 A |
| AC Voltage Range | 0.1 V to 600 V |
| DC Voltage Range | 0.1 V to 600 V |
| Resistance Range | 0.1 Ω to 40 MΩ |
| Capacitance Range | 0.1 µF to 1000 µF |
| Continuity | Beeper for low resistance |
| Jaw Opening | 30 mm (1.18 inches) |
| Safety Rating | CAT IV 300 V / CAT III 600 V |
| Power Source | 2 x AA batteries |
| Dimensions (L x W x H) | 8.15 x 2.95 x 1.34 inches (207 x 75 x 34 mm) |
| Weight | 15.04 ounces (426 g) |
| Operating Temperature | 0 °C to 40 °C (32 °F to 104 °F) |
9. Warranty and Support
9.1. Warranty Information
The Fluke 302+ Digital Clamp Meter comes with a standard 2-year manufacturer's warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from accident, misuse, abuse, alteration, contamination, or abnormal operating conditions. For full warranty terms and conditions, please refer to the warranty card included with your product or visit the official Fluke website.
9.2. Customer Support
For technical assistance, service, or repair, please contact Fluke customer support. Contact information can typically be found on the official Fluke website or in the product documentation. When contacting support, please have your product model number (302+) and serial number ready.
