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Feature
Performs resistance testing of grounding systems and earth AC voltage for new and existing buildings, structures, equipment, and electrical systemsDoes not trip ground fault breakers of the circuit under test
Data hold function keeps the last reading on the display after disconnecting from the circuit under test, which allows user to record measurements when convenient
Auto power-off feature turns off output after 3-6 minutes of continuous testing
Includes three test leads (red 15m, yellow 10m, green 5m), auxiliary earth spikes, carrying case, and batteries
Description
The B&K Precision 309 lightweight portable meter tests earth ground resistance and earth AC voltage for new and existing buildings, structures, equipment, and electrical systems. When in use, the 2 milliAmp (mA) measuring current permits earth resistance testing without tripping ground fault breakers of the circuit under test. The data hold function with screen indicator allows the user to retain the measurements on the display for manual recording. The auto power-off feature turns off the meter after 3-6 minutes of continuous testing and the battery indicator notifies the user when batteries are low to ensure accurate measurements. Ground-resistance meters are used by electricians and contractors working in industrial, utility, and field servicing.
The B&K Precision 309 meter comes with a set of three test leads, two auxiliary earth spikes, a hard carrying case, and batteries. The meter is rated for indoor use, altitude up to 2,000m/6561ft., maximum relative humidity to 80 percent, and for use at pollution degree 2. Applicable safety standards are IEC/EN 61010-1 and Installation CAT III 200V.
Specifications
| Measuring frequency | 820Hz at approximately 2mA |
| Earth resistance ranges and resolutions | 0 - 20 range (0.01 resolution); 0 - 200 range (0.1 resolution); 0 - 2000 range (1 resolution) |
| Earth resistance accuracy | + or - 2% reading + 2 digits |
| Earth voltage range | 0 to 200V AC (40-500Hz) |
| Earth voltage accuracy | + or - 1% reading + 2 digits or + or - 0.1Ω, whichever is greater |
| Temperature range | 0 to 40 degrees C/32 to 104 degrees F |
| Power source | (6) 1.5V AA batteries (included) |
| Weight | 410g/0.9lbs. (including batteries) |
| Dimensions | 100 x 163 x 50mm (H x W x D) |
H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.
Ground-resistance meters test the condition of a grounding system, and provide resistivity measurements in ohms. The meters are available in digital, analog, and clamp models. Grounding systems protect people and equipment, and provide a safe path for the dissipation of fault currents, lightning strikes, static discharges, EMI and RFI signals, and interference. Regular testing of a grounding system is important for safety and protection of equipment. For example, corrosive soil with high moisture content can degrade ground rods and connections in existing systems and increase the resistance of the system. Ground-resistance meters are used in conjunction with a variety of testing methods to troubleshoot intermittent electrical problems or as part of a regular maintenance plan.
B&K Precision manufactures test and measurement instruments for research and development, production-line testing, and electronic field service applications. The company, founded in 1951, is headquartered in Yorba Linda, CA. It meets International Organization for Standardization (ISO) standard 9001:2008 and is compliant with Restriction of Hazardous Substances (RoHS) and waste electronic and electrical equipment (WEEE) directives.Whats in the Box?
- B&K Precision 309 digital earth resistance meter
- (3) measuring leads: red 15m/50ft., yellow 10m/33ft., green 5m/16.4ft.
- Auxiliary earth spikes
- Carrying case
- (6) 1.5V AA alkaline batteries
- Instruction manual