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0102030405

Huazheng Digital HZRC2000 + Earth Resistance Tester

The HZRC series of Pincers Earth Testers is widely used for measuring grounding resistance in power, telecommunications, meteorology, oilfields, construction, and industrial and electrical equipment.When measuring a grounding system with loop current, does not require disconnecting the grounding wire and does not need an auxiliary electrode. It is safe, fast, and easy to use.The HZRC series of Pincers Earth Testers can detect faults that are beyond the reach of traditional methods and can be applied in situations where traditional methods are not effective.

Handheld Capacitance Inductance Tester (2)

The HZRC series of Pincers Earth Testers can measure the combined value of grounding body resistance and grounding lead resistance. It is applicable in power systems, telecommunications systems, lightning protection systems for buildings, and gas station grounding systems.

Brief Introduction

This instrument was designed by technical department of Huazheng Electric Manufacturing (Baoding) Co., Ltd.. Its performance is mainly reflected in:

• Breakthrough in self-test the boot a long time to wait, start immediately into the test.

• Breakthrough relay self-test mode, using advanced processing algorithms and digital integration technology, a fully intelligent.

• Break the old product to heavy issues, more in line with characteristics of handheld devices.

• New design, panel operation with 6 buttons, better performance.

• An increase of sound and light alarm, "beep—beep--beep --" alarm sound.

• Increase the interference signal recognition indicator.

• Improved anti-jamming capability and test stability.

• Stored data: 99 Units.

• Wider range: 0.01Ω-1200Ω

• Lower power consumption: Maximum operating current not exceeding 50mA.

I.Specification

1.Model of Series

Model	Jaw Size (mm)	Range of Resistance (Ω)	Range of Current (A)	Storage Function	Alarm Function
HZRC2000+	65×32	0.01--1200	--	99 Units	√
HZRC2000A+	65×32	0.01--200	--	99 Units	√
HZRC2000C+	65×32	0.01--1200	0.0--20.0	99 Units	√
HZRC2100+	φ32	0.01--1200	--	99 Units	√
HZRC2100A+	φ32	0.01--200	--	99 Units	√
HZRC2100C+	φ32	0.01--1200	0.0--20.0	99 Units	√

Note: “√” means available.

2.Ranges and Accuracy of Measurement

Mode	Range	Resolution	Accuracy
Resistance	0.010Ω-0.099Ω	0.001Ω	±（1%＋0.01Ω）
	0.10Ω-0.99Ω	0.01Ω	±（1%＋0.01Ω）
	1.0Ω-49.9Ω	0.1Ω	±（1%＋0.1Ω）
	50.0Ω-99.5Ω	0.5Ω	±（1.5%＋0.5Ω）
	100Ω-199Ω	1Ω	±（2%＋1Ω）
	200Ω-395Ω	5Ω	±（5%＋5Ω）
	400-590Ω	10Ω	±（10%＋10Ω）
	600Ω-880Ω	20Ω	±（20%＋20Ω）
	900Ω-1200Ω	30Ω	±（25%＋30Ω）
*Current (True-RMS)	0.00mA -9.00mA	0.05mA	±（2.5%＋2mA）
	10.0mA -99.0mA	0.1mA	±（2.5%＋10mA）
	100mA -300mA	1mA	±（2.5%＋20mA）
	0.30A-2.99A	0.01A	±（2.5%＋0.1A）
	3.0A-9.9A	0.1A	±（2.5%＋0.5A）
	10.0A-20.0A	0.1 A	±（2.5%＋1 A）

Resistance Measurement Frequency: >1KHz

Measured Current Frequency: 50Hz/60Hz

Setting Range of Resistance Alarm Critical Value: 1Ω-199Ω

*Setting Range of Current Alarm Critical Value：1mA -499mA

3. Specifications

Instrument safety: IEC/EN61010-1, IEC/EN6010-2-032

Insulation: double insulation

Pollution degree: class II

Overvoltage category: CAT III 150V to ground, Max 20A

Degrees of protection:

-IP30, Group III equipment as per EN 60529 Ed 92

-IK04, as per EN 50102 Ed 95

Dimensions(L×W×H):

-Long elliptic jaw: 285mm×90mm×66mm; (11×4×3 inches)

-Round jaw: 260mm×90mm×66mm;(10×4×3 inches)

Span of Jaw: Long elliptic jaw 35mm; round jaw 32mm

Weight (including batteries): Long elliptic jaw-1160g, Round jaw-1120g

Battery type: 4 ×1.5V alkaline LR6 AA battery

Low battery indication: is displayed

Internal consumption: <50mA

Auto Power off: after 5 minutes of idleness

Display: 4 LCD, sign, decimal point and backlight

Memory size: 99 Units of Reading

Environment (Temperature & Relative Humidity):

-Working: -10°C~55°C, 10%RH-90%RH

-Storage: -20°C ~60°C, below 70%RH

Range shift: Full range automatic shifting

External magnetic field: <40A/m

External electric field: <1V/m

Data upload interface: RS232 (Optional)

1. Multi-Point Grounding System

As for the multi-point grounding system (such as electricity transmission tower grounding system, grounding cable communications systems, certain buildings, etc.), They usually pass the overhead ground wire (cable shielding layer) connected to form a grounding system.

As the Meter is in the above measurement, its equivalent electric circuit is shown in the figure below:

Where: R1 is the target grounding resistance.

R0 is the equivalent resistance of the other entire tower grounding resistances paralleled.

Although strictly on the theoretical grounding, because of the existence of so-called "mutual resistance”, R0 is not the usual parallel value in the sense of electrical engineering (slightly higher than its IEC parallel output value). But because a tower-grounding hemisphere was much smaller than the distance between the towers, and with a great number of locations after all, R0 is much smaller than R1. Therefore, it can be justified to assume R0=0 from an engineering perspective. In this way, the resistance we measured should be R1.

Times of comparing tests in different environments and different occasions with the traditional method proved that the above assumption is entirely reasonable.

2. Limited Point Grounding System

This is also quite common. For example, in some towers, five towers are linked with each other through overhead ground wire; Besides, the grounding of some of the buildings is not an independent grounding grid, but several grounding bodies connected with each other through the wire.

Under such circumstances, the above R0 regarded as 0, will yield more error on the results of the measurement.

Due to the same reasons mentioned above, we may ignore the impact of the mutual resistance; and the equivalent resistance of the grounding resistance paralleled is calculated by the usual sense. Thus, for the grounding system of N (N is smaller, but larger than 2) grounding bodies, it can offer N equations:

Where: R1、R2、……RN are grounding resistances of N grounding bodies.

R1T、R2T、……RNT are the resistances measured with the Meter in the different grounding branches.

It is nonlinear equations with N unknown numbers and N equations. It indeed has a definite solution, but it is very difficult to solve the issue artificially, even impossible when N is larger.

Therefore, you’re expected to buy the Limited-Point Grounding System Solution software produced by this Company. Users can use the office computer or notebook computer to carry out solutions.

In principle, in addition to ignoring the mutual resistance, this method does not have the measurement error caused by neglecting R0.

However, users need to pay attention to that: in response to the number of the grounding bodies mutually linked in your grounding system, it is necessary to measure the same number of the testing values for calculating of the program, not more or less. And the program would output the same number of grounding resistance values.

3. Single-Point Grounding System

From the measuring principle, HZRC series Meter can only measure the loop resistance, and the single-point grounding is not measured. However, users will be able to use a testing line very near to the earth electrode of the grounding system to artificially create a loop for testing. The following presented is two kinds of methods for the single-point grounding measurement by use of the Meter. These two methods can be applied to the occasions beyond the reach of the traditional voltage-current testing methods.

⑴.Two-Point Method

As shown in the figure below, in the vicinity of the measured grounding body RA, find an independent grounding body of better grounding state RB (for example, near a water pipe or a building). RA and RB line will connect to each other using a single testing line.

As the resistance value measured by the Meter is the value of the series resistance from the testing line and two grounding resistances.

RT=RA + RB + RL

Where: RT is the resistance value measured with the Meter.

RL is the resistance value of the testing line. Meter can measure out the resistance value by connecting the test lines with both ends.

So, if the measurement value of the Meter is smaller than the allowable value of the grounding resistance, then the two grounding bodies are qualified for grounding resistance.

(2) Three-Point Method

As shown in the figure below, in the vicinity of the measured grounding body RA, find two independent grounding bodies of better grounding state RB and RC.

First, link RA and RB with a test line; use the Meter to get the first reading R1.

Second, have RB and RC linked up, as shown in the following figure. Use the Meter to get the second reading R2.

Third, have RC and RA linked up, as shown in the following figure. Use the Meter to get the third reading R3.

In the above three steps, the reading measured in each step is the value of the two series grounding resistance. In this way, we can easily calculate the value of each grounding resistance:

From: R1=RA+RB R2=RB+RC R3=RC+RA

We get: RA=（R1+R3-R2）÷2

This is the grounding resistance value of the grounding body RA. To facilitate the memory of the above formula, these three grounding bodies scan be viewed as a triangle; then the measured resistance is equivalent to the value of the resistance values of the adjacent edges plus or minus resistance value of the opposite sides, and divided by 2.

As the reference points, the grounding resistance values of the other two grounding bodies are:

RB=R1-RA

RC=R3-RA

Structure of Meter

1. Long Pincers Jaw : 65mmx32mm

2. Round Pincer Jaw : φ32mm

3. Trigger: to control opening and closing of jaw

4. HOLD Key: lock / Release display / Storage

5. POWER Key: Boot Up / Shutdown /*Quit /Clear Data

6. MEM Key: Data Access / Clear Data

7. AL Alarm Function Key: Alarm Open / Turn Off

Alarm Critical Value Setting

8. Resistance Measure Switch Key Ω (Right Arrow Key)

9. *Current Measure Switch Key A (Left Arrow Key)

10. Liquid Crystal Display (LCD)

Note: "*" is limited to C+.

III.Trouble shooting

Symptoms	Possible Causes	Remedies
The instrument cannot be buttoned on.	No batteries.	Set the batteries.
	Faulty battery polarity	Install batteries in correct polarity.
	Insufficient capacity of battery	Replace the batteries.
	Poor contact of battery contacts	Replace the battery contacts.
	Wrong battery type	Replace with right type.
	A break in a battery harness	Make a continuity test of test lead. If there is no continuity, replace the battery harness.
	Departure of the POWER button	Re-assemble the button.
	Poor contact of power plug	Re-plug or replace a plug.
	Defect of circuit component	Defect of PCB; when current consumption is about 100mA or more at 6V of battery voltage. Replace the PCB.
Indicating ERROR (Display “Err”, big error results or results unstable)	Insufficient capacity of battery	Replace the batteries.
	Contact surface of jaw is polluted by dust, oil etc.	Clean the surface.
	Poor enclose of jaw	Trigger the clamp several times and then re-boot.
	Defect of circuit component	Replace the PCB.
	Measure in wrong steps	Study the manual and follow it.
Incapable measurement of resistance	Insufficient capacity of battery	Replace the battery when “Low battery” mark is displayed on the LCD.
	Poor enclose of jaw, indicating “jaw-open” symbol on LCD	Trigger the clamp several times and then re-boot.
	Contact surface of jaw is polluted by dust, oil etc.	Clean the surface.
	Without self-calibration before test	Re-boot follow the manual, conduct measurement after self-calibration finished.
	Defect of circuit component	Check above points first. If there is no problem, replace the PCB, and do re-adjustment.

Symptoms	Possible Causes	Remedies
LCD Indication error(chip of segment, arithmeticpoint, unit and so on)	Poor contact of LCD connection wire	Re-plug the LCD connect plug or replace the plug.
	Defect of LCD	Replace the LCD.
	Insufficient capacity of battery	Replace the batteries.
	Defect of circuit component	Replace the PCB.
Incapable to hold reading	HOLD button Depart from the position	Re- assemble the button.
Incapable to hold reading	Defect of circuit component	Replace the PCB.

Handheld Capacitance Inductance Tester (1)

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