Instruction Manual Model 309 Digital Earth Resistance Meter
(1) (6) (2) (7) (8) (3) (9) (10) (4) (5) (1) Jack For "EARTH" Lead Connection (2) Operation Indicator (3) Data Hold Switch (4) Timer Off Button (5) LCD Display .
1.INTRODUCTION NOTE This meter has been designed and tested according to IEC Publication 348, safety Requirements for Electronic Measuring Apparatus, IEC-1010 (EN 61010) and other safety standards. Follow all warnings to ensure safe operation. WARNING READ "SAFETY NOTES" ( NEXT PAGE ) BEFORE USING THE METER.
2.SAFETY NOTES Ÿ Read the following safety information carefully before attempting to operate or service the meter. Ÿ Use the meter only as specified in this manual. otherwise, the protection provided by this meter may be impaired. Ÿ Rated environmental conditions (1). Indoor Use. (2). Installation Category III. (3). Pollution Degree 2. (4). Altitude up to 2000 meter. (5). Relative humidity 80% max. (6). Ambient temperature 0~40 oC .
3.FEATURES Ÿ Capable of measuring earth voltage. Ÿ 2mA measuring current permits earth resistance tests without tripping earth leakage current breakers in the circuit under test. Ÿ Battery operated. Ÿ Auto power off function. The timer operates automatically about 3~6 minutes when the " PUSH BUTTON SWITCH" and "TIMER ON BUTTON" are pressed at the same time to keep the tester power on. Ÿ Data hold function. Ÿ Small and light weight. Ÿ Designed to meet IEC-1010-1 (EN61010-1) CAT III 200V.
4.SPECIFICATIONS Measurement system Earth resistance by constant Current inverter. 820Hz, 2mA approx. Earth voltage 0~200Vac, 40~500Hz. Earth resistance range and resolution 0~20W (0.01W). 0~200W (0.1W). 0~2000W(1W). Accuracy Earth voltage ± (1%rdg+2dgt) Earth resistance ± (2%rdg+2dgt) or ± 0.1W, which is greater. Safety standard IEC 1010-1 (EN61010-1) CAT III 200V. Low battery indication "B" symbol appears on the display. Data hold indication "DH" symbol appears on the display.
5.MEASURING METHODS BEFORE PROCEEDING WITH MEASUREMENT, READ THE SAFETY NOTES ON PAGE 2. 1. Connection with test leads Connect green, yellow and red test leads to instruMent terminals E, P and C with auxiliary earth bars P1, C1 driven into earth "IN A STRAIGHT LINE". (Fig.1) 2. Set the function switch to ACV position and make certain that the voltage reading is LESS THAN 10V AC, otherwise accurate earth resistance measurement may not be made. 3.
6.MAINTENANCE Ÿ Battery Replacement When the symbol "B" appears on the display, replace the batteries as follows (1) Disconnect the test leads from the instrument and turn off the power. (2) Use a screwdriver to unscrew the screw on back cover then slide the cover, take out the batteries and replace with new batteries Type SUM-3. (3) Place back cover and secure by a screw. Ÿ Cleaning and storage WARNING To avoid electrical shock or damage to the meter, do not get water inside the case.
7.Limited One-year Warranty B&K Precision warrants to the original purchaser that its products and the component parts thereof, will be free from defects in workmanship and materials for a period of one year from date of purchase from an authorized B&K Precision distributor. B&K Precision will, without charge, repair or replace, at its option, defective product or component parts. Returned product must be accompanied by proof of the purchase date in the form of a sales receipt.
8.Service Information Warranty Service: Please return the product in the original packaging with proof of purchase to the address below. Clearly state in writing the performance problem and return any leads, probes, connectors and accessories that you are using with the device. Non-Warranty Service: Return the product in the original packaging to the address below. Clearly state in writing the performance problem and return any leads, probes, connectors and accessories that you are using with the device.
B&K Precision 22820 Savi Ranch Parkway Yorba Linda, CA 92887 U.S.A. www.bkprecision.com Printed in Taiwan / Ver. 1.