Fluke 302+, 303, 305 - Clamp Meter Manual

Introduction

The Fluke 302+, 303, and 305 Clamp Meters (the Product) measures ac and dc voltage, ac current, resistance, and continuity.

Read "Safety Information" before you use the Product.

Specifications

Electrical Specifications

AC Current (Jaw)

AC Voltage

DC Voltage

Resistance

Mechanical Specifications

302+/303

305

Environmental Specifications

Operating Temperature	0°C to +40°C
Storage Temp	-30°C to +60°C
Operating Humidity	Non condensing (<10°C) ≤90% RH (at 10°C to 30°C) ≤75% RH (at 30°C to 40°C) (Without Condensation)
Operating Altitude	2000 meters
Storage Altitude	12,000 meters
EMI, EMC	Meets all applicable requirements in EN/IEC 61326-1
Temperature Coefficients	Add 0.1 x specified accuracy for each °C above 28°C or below 18°C
Measurement Category	CAT IV 300 V, CAT III 600 V
Safety Compliance	EN/IEC 61010-1, Pollution Degree 2 EN/IEC 61010-2-032 EN/IEC 61010-031/A1
IP Rating	IP 30 Per IEC 60529; Non-operating
Batteries	2 AAA, NEDA 24A, IEC LR03

Maintenance

Clean the Product

To prevent possible damage to the Product or to equipment under test, do not use abrasive cleaners. They will damage the case.
To clean the Product, use a cloth with a mild cleaning solution.

Battery Replacement

To prevent possible explosion, fire, or personal injury, replace the batteries when the low battery indicator () shows to prevent incorrect measurements.

To prevent possible damage to the Product or to equipment under test:

• Remove batteries to prevent battery leakage and damage to the Product if it is not used for an extended period.
• Be sure that the battery polarity is correct to prevent battery leakage.

To change the batteries, see Figure 2:

1. Make sure the Product is off.
2. Turn over the Product to access the battery compartment door screw.
3. Use a flat-head screwdriver to loosen the battery compartment door screw and lift off the battery compartment door.
4. Replace the two AAA batteries. Make sure to use the correct polarity when you put the batteries into the battery compartment door.
5. Reattach the battery compartment door.
6. Tighten the battery compartment door screw.

Jaw Maintenance

If the Product does not work properly:

1. Inspect the jaw mating surface for cleanliness. If any foreign material (including rust) is present, the jaw will not close properly and measurement errors will result.
2. Open the jaws and wipe the clamp metal ends with a non-flammable oil and cloth.

User-Replaceable Parts

User-replaceable parts are shown in Table 2. To order parts, see "Contact Fluke".

Table 2. User-Replaceable Parts

Required Equipment

The equipment in Table 3 is necessary for the performance tests and calibration adjustment.

Table 3. Required Equipment

Performance Tests

To prevent possible electrical shock, fire, or personal injury, do not go through the performance test procedures unless the Product is fully assembled.

The performance tests verify the full operation of the Product and measure the accuracy of each function against the Product specifications. If the Product fails a part of the test, calibration adjustment and/or repair is necessary. See "Calibration Adjustment".
Before you do the performance tests:

1. Make sure that you have the necessary equipment. See Table 3.
2. Make sure the Product batteries are good and replace them if necessary. See "Battery Replacement".
3. Warm up the Calibrator as necessary. Refer to its specifications.
4. Let the temperature of the UUT (unit under test) become stable to room temperature.

Test the Display and Firmware Version

To verify that all segments of the display function:

1. With the Product off, push and hold.
2. Turn the Product on.
3. All display segments are shown. See Figure 3.
   

If segments of the display are missing, repair is necessary. See "Contact Fluke".
When is released, the firmware current version is shown:

• "r007" is shown for 302+/303.
• "r004" is shown for 305.
  "F30x" designates model number 302+, 303 or 305.

Backlight

To verify that the backlight functions:

1. With the Product on, push. The backlight comes on.
2. Push again to turn off the backlight.
3. If the backlight does not function correctly, repair is necessary. See "Contact Fluke".

Button Test

To verify that the buttons function, turn on the Product and push each button separately. Each button push causes the Product to beep. When you push the HOLD button, shows on the display. If the buttons do nothing, repair is necessary. See "Contact Fluke".

Current

To do the ac current test:

1. Connect the Calibrator A ac output and ground to the 50-Turn Coil. See Figure 4 for test connections.
2. Turn the Product to.
3. Apply the input level for each step shown in Table 4.
4. Compare the indication on the Product display with the UUT reading limits in Table 4.
5. If the display indication is outside of the range shown in Table 4, calibration adjustment or repair of the Product is necessary. See "Calibration Adjustment".

Table 4. AC Current Performance Tests

Figure 4. AC Current Test Connections

Volts and Ohms

To do the Volts and Ohms performance tests, turn the rotary switch to the necessary function and apply the values shown in Table 5. See Figure 5 for the test connections.

Table 5. Volts and Ohms Performance Tests

Test (Switch Position)	Calibrator Output	UUT Meter Reading Limit
		Low	High
V ac	10 V @ 50 Hz	9.4 V	10.7 V
	600 V @ 50 Hz	590.5 V	609.5 V
	600 V @ 400 Hz	590.5 V	609.5 V
V dc	-600 V	-606.5 V	-593.5 V
	-10 V	-10.6 V	-9.4 V
	10 V	9.4 V	10.6 V
	600 V	593.5 V	606.5 V
Ohms	0 Ω	0.0 Ω	0.5 Ω
	10 Ω	9.4 Ω	10.6 Ω
	350 Ω	346.0 Ω	354.0 Ω
	3500 Ω	3460 Ω	3540 Ω

Figure 5. Volts and Ohms Performance Test Connections

Calibration Adjustment

The Product features closed-case calibration adjustment and uses known reference sources. The Product measures the applied reference source, calculates correction factors, and stores the correction factors in nonvolatile memory.
Should the Product fail any of the performance tests, do the calibration adjustment procedure.
To do the calibration adjustment:

1. Remove the Product battery door. See "Battery Replacement".
2. Apply 3.0 V across the battery contacts on the pca. Note the polarity that is shown in Figure 6.
3. Turn the rotary switch to the function to be adjusted.
4. Remove the calibration seal.
5. Short across the CAL keypad on the pca and then remove the short. See Figure 6. This puts the Product into calibration mode.
6. When "C-1.2" is shown on the display, apply the correct input signals shown in Table 6 to the Product. For each function, the calibration step shown on the display will advance.
7. After each step, push the HOLD button to confirm the calibration step, store the value, and go to the next step.
8. 
   Set the Calibrator to Standby after you complete adjustment of each function.
   Notes
   If any calibration point is missing, "Err" is shown on the display. After you push the HOLD button, wait until the calibration step number advances before you change the calibrator source. Some adjustment steps can take several seconds to execute before the Product goes to the subsequent step.
9. When calibration adjustment is complete, remove the 3.0 V supply. The Product will exit the calibration mode automatically.
10. Replace the batteries and battery door.

Figure 6. Short the CAL Keypad

Table 6. Calibration Adjustment