BY DIGITAL EARTH RESISTANCE TESTER USER MANUAL
INTRODUCTION
1、The principle of the tester
The BY digital grounding resistance tester rejects off the traditional manpower means to generate electricity by rocking-turn. It adopts the advance sweeping integrate circuit, and DC/AC transpositional technology to incorporate three base leads with four base lines to form a new kind of grounding resistance tester The tester works as the follow steps: first the DC/AC convertor change the DC voltage to the AC constant low frequency voltage, then the voltage pass through the accessorial grounding electrode C and the object to be tested E to form a loop, the AC oltage landing on the object to be tested E go through the accessorial grounding electrode C to the AC amplifier to be magnify, then to be demodulated and displayed by the meter. USE the diploid switch , you can get three distinct range:0~2Ω, 0~20Ω, 0~200Ω.
2、APPLICATION:
It can be used by the department such as electric-power、post、railway、communication services、mine and so on to measure the grounding resistance of any device and to measure the value of low resistance ; and can be used to measure the soil resistivity and grounding voltage
3、CHARACTERISTIC
●Use the high strength to make it’s DOS shell, adopt lockup potential synchronous-scope to prevent from jam of frequency and firing frequency, and fit out switch capacitance filter to make the tester has better anti-jamming.
●Adopt DC/AC convertor to change the DC voltage to the AC constant low frequency voltage in order to measure.
●If the assistant grounding resistance change in the range of 0~2KΩ(RC),0~40KΩ(RP), it is allowable and will not influence the measure.
●The tester does not need to be regulated equation, 3(1/2) LCD to display, it can measure the grounding resistance, and measure the value of low resistance ; and can be used to measure the soil resistivity and the AC grounding voltage.
●If the loop is obstructed the meter will display “1” to indicate that it has go over the range.
TECHNICAL PARAMETER
1、CONDITION
environment temperature:0℃~+45℃
relatively humidity:≤85%
2、MEASURE RANGE
resistance:0~2Ω(10mA), 2~20Ω(10mA) , 20~200Ω(10mA)
voltage: AC 0~20V
3、PRECISION AND DIFFERENTIATION
precision: 0~0.2Ω≤±3%±1d
2~200Ω≤±1.5%±1d
1~20V≤±3%±1d
differentiation: 0.001Ω、0.01Ω、 0.1Ω、0.01V
4、ERROR BROUGHT BY THE ASSISTANT GROUNDING RESISTANCE AND GROUNDING VOLTAGE .
allowable resistant grounding resistance RC (between C1 and C2)<1.8kΩ;
RP(between P1 and P2)<40 kΩ; error≤±5%
allowable grounding voltage:≤5V error≤±5%
5、POWER AND WASTAGE
Maximal power wastage≤2W
Power: 7.2V~9V(6 number 5 Ni-GR rechargeable batteries.
Volume: 220mm×200mm×105mm
Weight: ≤1.4㎏
TIPWIZARD
1、To measure the grounding resistance(follow as picture 1)
the electric equipment must be cut off
﹡along the grounding electrode to be tested E(C2、P2) and the voltage probe and the voltaic probe, let the distance is 20 meter linear, then put the voltage electrode between the pole E and C, plug the probe into the mother earth.
﹡use the special leads to connect the ends E(C2、P2)、P1、C1 of the tester with the corresponding ends of the probe.
﹡push the ROWER SWITCH “ON” of the tester, select appropriate shelves and press the key, the light of the shelves is lighten, then the data display on the meter is the grounding resistance to be tested .
2、To measure the soil resistivity
﹡before testing,plug four probes equidistantly along as line in the soil , the distance between any two probes is L, and the depth of he probe to plug into the soil is L/20cm, use
the special leads to connect the ends C1、P1、C2、P2 with the corresponding ends of the probe. If the value of the resistance to be measured by the tester is R, then the soil resistivity can be calculated according to the following formula: Φ=2πRL Φ-the soil resistivity
L-the distance between any two probes(cm)
R-the value displayed on the meter(Ω)
the soil resistivity to be measured by this means can be approximatively regarded as the average resistivity of the area geology between the probes to be plug in.
﹡the probes to be used to measure the grounding resistance and the soil resistivity popularly form as pipes of alloy steel or orbicular steel that is Φ=25mm and long 0.5~1m.
3、to measure resistance of conductors (picture3
4、to measure grounding voltage to measure
grounding voltage follow as picture1, unfix
pin C1 , reserve the pins between E and P1, start up shelves of grounding voltage (EV), indicator light shine, then the data display on the meter is the AC grounding voltage between E and P1.
5、after measure, please push the power off key to put of the ester .
MAINTENANCE AND NOTICE
1、pay attention to the environmental temperature and humidity,so as to preserve the meter. It must be preserved in the place that is dry and ventilated to prevent from being affected with damp, and must be prevent from acid、alkaline and caustic gas.
2、when measuring the grounding resistance the joint between the electric equipment must be cut out.When measuring the grounding resistance that less than 1Ω, must use special lines to connect with the earth-object, C2 is outward, P2 is inward such as picture 4:
3、when measuring grounding resistance of large grounding network can’t according to the normal means, can consult with the regulations of the means of ampere meter and voltage meter to select the locus to cut in.
4、you’d better measure 3~4 times from different direction, then average the result.
5、there is rechargeable pile in the meter. when the voltage of the pile under 7.2V, the meter displays sign of low voltage “ ”in it’s top left corner to prompt that it needs to be recharged in good season about 8 hours . when the tester is not used for a long time, you must charge the pile after a settled time.
6、accessories
﹡testing leads 4 sets
﹡user manual 1set
﹡certification 1set
﹡accessories can be selected: grounding probe、 leads long 20m 、leads long 40m(it’s price count additional)
SERVINGS
All the user can enjoy the servings such as:
1、If the tester is out of order after it has being bought for 2 months, we will replace a new tester for you on the cuff,but the tester mustn’t be took apart.
2、We will maintain the meter on the cuff for 2 years, if the meter has bad quality.
3、If the meter has been over 2 years, we will maintain it hronically, butonly charge material fee properly.
4、If the meter is out of order, you must ask for career man or send the meter to our company, you mustn’t took apart he meter, other wise we will not answer for the expense you will bring.