Mastech Analog earth resistance tester User manual

User’s Manual

• The latest circuit design permits the instrument to

operate with the minimum of influence from earth

voltage and dearth resistance of auxiliary earth bars.

• Auxiliary earth resistance and lead wire connection

can be self-checked by pressing “BATT.CHECK”

button. “OK” lamp lights up when the instrument is

ready for accurate earth resistance measurements.

• Low power consumption Only 12V/100mA max.

• Push switch buttons permit smooth operation of the

instrument .

• Earth resistance value can be read directly from the

scale.

• Simplified measurement can be easily made by

pressing th “Simplified Meas.” Switch button only. No

need to use a shorting wire as terminals P and C and be

internally shorted by pressing this switch.

• Battery replacement can be easily made without

removing the carrying case.

• Hard plastic carrying case is water resistant and

accommodates all accessories.

1. Features

01 02

• Measuring ranges:

Earth resistance: 10/100/1000Ω

Earth voltage: 30V AC (5KΩ/V approx.)

• Accuracy:

Earth resistance Within ±5% of full scale

Earth voltage Within ±5% of full scale

• Measurement system:

Earth resistance

By constant current inverter.

800Hz approx,2mA

Earth voltage

By rectifier type

5KΩ/V approx,40~500Hz

• Protection levels: EN 61010 – 1 ; CAT II

• Protection class: class III

• Withstand voltage:

1500V AC for one minute between electrical circuit and

housing case.

• Self-Check facility:

Lead wire connection to C and P terminals and proper

auxiliary earth resistance can be checked by pressing

“BATT.CHECK” button. “OK” lamp is illuminated.

• Batteries: 8pcs. 1.5V AA battery or equivalent

• Dimensions: 140(L)×140(W)×90(D)mm

• Weight: 800g approx.

• Accessories:

Test leads (red-15m, yellow-10m,green-5m)

Auxiliary earth bars carrying case.

2. Specifications 3. Designations

① OK lamp ② Function switch buttons

③ Ohm range switch buttons ④ Terminals

⑤ Scale plate ⑥ Panel

4. How to make measurements

4-1 Preparation for measurement

A maximum of 130V DC is present across E and C

or E and P terminals during measurement or when

“SIMPLIFIED MEAS.” Button is pressed. Also, it is

present across P and C terminals when “BATT.

CHECK” button is pressed. Therefore, never touch

these terminals with hand. Always, press “BATT.

CHECK” button after use so that all the range and

function switch buttons are in off (up) position.

Then, release “BATT.CHECK” button.

WARNING

4.1.1 Meter zero adjust

Check to see if the meter pointer is adjusted exactly to

the mechanical zero position of the Ω or V scale. If the

pointer is off the zero position in either left or right

direction open the panel and turn the zero adjust screw

behind the panel with a screwdriver. The panel can be

lifted up to 90 degrees by holding both sides as shown

below.

4.1.2 Connection of lead wires

As shown in Fig.3,stick the earth bars P and C deep

into the earth.

They should be aligned at an interval of 5m to 10m from

the earthed equipment e. Connect the green lead wire

to the terminal E of the instrument, yellow wire to

terminal P and red wire to terminal C. Make sure to

stick the auxiliary earth bars in the moist part of the

earth. Give enough water where the auxiliary earth bars

have to be stuck into the dry, stony or sandy part of the

earth so that it may become moist.

Where it is not possible to drive the auxiliary earth bars

into a hard surface such as concrete ground, lay the

earth bars there, covet them with a cloth and put water

(preferably salt water).This may allow earth resistance

measurements. (However, this is not possible with

asphalt ground)

NOTE:

When connecting the lead wires, make sure that

they are separated. If the measurement is made with

the lead wires twisted or in touch with each other i t

03 04 05

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER

User’s Manual

• The latest circuit design permits the instrument to

operate with the minimum of influence from earth

voltage and dearth resistance of auxiliary earth bars.

• Auxiliary earth resistance and lead wire connection

can be self-checked by pressing “BATT.CHECK”

button. “OK” lamp lights up when the instrument is

ready for accurate earth resistance measurements.

• Low power consumption Only 12V/100mA max.

• Push switch buttons permit smooth operation of the

instrument .

• Earth resistance value can be read directly from the

scale.

• Simplified measurement can be easily made by

pressing th “Simplified Meas.” Switch button only. No

need to use a shorting wire as terminals P and C and be

internally shorted by pressing this switch.

• Battery replacement can be easily made without

removing the carrying case.

• Hard plastic carrying case is water resistant and

accommodates all accessories.

1. Features

01 02

• Measuring ranges:

Earth resistance: 10/100/1000Ω

Earth voltage: 30V AC (5KΩ/V approx.)

• Accuracy:

Earth resistance Within ±5% of full scale

Earth voltage Within ±5% of full scale

• Measurement system:

Earth resistance

By constant current inverter.

800Hz approx,2mA

Earth voltage

By rectifier type

5KΩ/V approx,40~500Hz

• Protection levels: EN 61010 – 1 ; CAT II

• Protection class: class III

• Withstand voltage:

1500V AC for one minute between electrical circuit and

housing case.

• Self-Check facility:

Lead wire connection to C and P terminals and proper

auxiliary earth resistance can be checked by pressing

“BATT.CHECK” button. “OK” lamp is illuminated.

• Batteries: 8pcs. 1.5V AA battery or equivalent

• Dimensions: 140(L)×140(W)×90(D)mm

• Weight: 800g approx.

• Accessories:

Test leads (red-15m, yellow-10m,green-5m)

Auxiliary earth bars carrying case.

2. Specifications 3. Designations

① OK lamp ② Function switch buttons

③ Ohm range switch buttons ④ Terminals

⑤ Scale plate ⑥ Panel

4. How to make measurements

4-1 Preparation for measurement

A maximum of 130V DC is present across E and C

or E and P terminals during measurement or when

“SIMPLIFIED MEAS.” Button is pressed. Also, it is

present across P and C terminals when “BATT.

CHECK” button is pressed. Therefore, never touch

these terminals with hand. Always, press “BATT.

CHECK” button after use so that all the range and

function switch buttons are in off (up) position.

Then, release “BATT.CHECK” button.

WARNING

4.1.1 Meter zero adjust

Check to see if the meter pointer is adjusted exactly to

the mechanical zero position of the Ω or V scale. If the

pointer is off the zero position in either left or right

direction open the panel and turn the zero adjust screw

behind the panel with a screwdriver. The panel can be

lifted up to 90 degrees by holding both sides as shown

below.

4.1.2 Connection of lead wires

As shown in Fig.3,stick the earth bars P and C deep

into the earth.

They should be aligned at an interval of 5m to 10m from

the earthed equipment e. Connect the green lead wire

to the terminal E of the instrument, yellow wire to

terminal P and red wire to terminal C. Make sure to

stick the auxiliary earth bars in the moist part of the

earth. Give enough water where the auxiliary earth bars

have to be stuck into the dry, stony or sandy part of the

earth so that it may become moist.

Where it is not possible to drive the auxiliary earth bars

into a hard surface such as concrete ground, lay the

earth bars there, covet them with a cloth and put water

(preferably salt water).This may allow earth resistance

measurements. (However, this is not possible with

asphalt ground)

NOTE:

When connecting the lead wires, make sure that

they are separated. If the measurement is made with

the lead wires twisted or in touch with each other i t

03 04 05

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER

User’s Manual

• The latest circuit design permits the instrument to

operate with the minimum of influence from earth

voltage and dearth resistance of auxiliary earth bars.

• Auxiliary earth resistance and lead wire connection

can be self-checked by pressing “BATT.CHECK”

button. “OK” lamp lights up when the instrument is

ready for accurate earth resistance measurements.

• Low power consumption Only 12V/100mA max.

• Push switch buttons permit smooth operation of the

instrument .

• Earth resistance value can be read directly from the

scale.

• Simplified measurement can be easily made by

pressing th “Simplified Meas.” Switch button only. No

need to use a shorting wire as terminals P and C and be

internally shorted by pressing this switch.

• Battery replacement can be easily made without

removing the carrying case.

• Hard plastic carrying case is water resistant and

accommodates all accessories.

1. Features

01 02

• Measuring ranges:

Earth resistance: 10/100/1000Ω

Earth voltage: 30V AC (5KΩ/V approx.)

• Accuracy:

Earth resistance Within ±5% of full scale

Earth voltage Within ±5% of full scale

• Measurement system:

Earth resistance

By constant current inverter.

800Hz approx,2mA

Earth voltage

By rectifier type

5KΩ/V approx,40~500Hz

• Protection levels: EN 61010 – 1 ; CAT II

• Protection class: class III

• Withstand voltage:

1500V AC for one minute between electrical circuit and

housing case.

• Self-Check facility:

Lead wire connection to C and P terminals and proper

auxiliary earth resistance can be checked by pressing

“BATT.CHECK” button. “OK” lamp is illuminated.

• Batteries: 8pcs. 1.5V AA battery or equivalent

• Dimensions: 140(L)×140(W)×90(D)mm

• Weight: 800g approx.

• Accessories:

Test leads (red-15m, yellow-10m,green-5m)

Auxiliary earth bars carrying case.

2. Specifications 3. Designations

① OK lamp ② Function switch buttons

③ Ohm range switch buttons ④ Terminals

⑤ Scale plate ⑥ Panel

4. How to make measurements

4-1 Preparation for measurement

A maximum of 130V DC is present across E and C

or E and P terminals during measurement or when

“SIMPLIFIED MEAS.” Button is pressed. Also, it is

present across P and C terminals when “BATT.

CHECK” button is pressed. Therefore, never touch

these terminals with hand. Always, press “BATT.

CHECK” button after use so that all the range and

function switch buttons are in off (up) position.

Then, release “BATT.CHECK” button.

WARNING

4.1.1 Meter zero adjust

Check to see if the meter pointer is adjusted exactly to

the mechanical zero position of the Ω or V scale. If the

pointer is off the zero position in either left or right

direction open the panel and turn the zero adjust screw

behind the panel with a screwdriver. The panel can be

lifted up to 90 degrees by holding both sides as shown

below.

4.1.2 Connection of lead wires

As shown in Fig.3,stick the earth bars P and C deep

into the earth.

They should be aligned at an interval of 5m to 10m from

the earthed equipment e. Connect the green lead wire

to the terminal E of the instrument, yellow wire to

terminal P and red wire to terminal C. Make sure to

stick the auxiliary earth bars in the moist part of the

earth. Give enough water where the auxiliary earth bars

have to be stuck into the dry, stony or sandy part of the

earth so that it may become moist.

Where it is not possible to drive the auxiliary earth bars

into a hard surface such as concrete ground, lay the

earth bars there, covet them with a cloth and put water

(preferably salt water).This may allow earth resistance

measurements. (However, this is not possible with

asphalt ground)

NOTE:

When connecting the lead wires, make sure that

they are separated. If the measurement is made with

the lead wires twisted or in touch with each other i t

03 04 05

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER

User’s Manual

• The latest circuit design permits the instrument to

operate with the minimum of influence from earth

voltage and dearth resistance of auxiliary earth bars.

• Auxiliary earth resistance and lead wire connection

can be self-checked by pressing “BATT.CHECK”

button. “OK” lamp lights up when the instrument is

ready for accurate earth resistance measurements.

• Low power consumption Only 12V/100mA max.

• Push switch buttons permit smooth operation of the

instrument .

• Earth resistance value can be read directly from the

scale.

• Simplified measurement can be easily made by

pressing th “Simplified Meas.” Switch button only. No

need to use a shorting wire as terminals P and C and be

internally shorted by pressing this switch.

• Battery replacement can be easily made without

removing the carrying case.

• Hard plastic carrying case is water resistant and

accommodates all accessories.

1. Features

01 02

• Measuring ranges:

Earth resistance: 10/100/1000Ω

Earth voltage: 30V AC (5KΩ/V approx.)

• Accuracy:

Earth resistance Within ±5% of full scale

Earth voltage Within ±5% of full scale

• Measurement system:

Earth resistance

By constant current inverter.

800Hz approx,2mA

Earth voltage

By rectifier type

5KΩ/V approx,40~500Hz

• Protection levels: EN 61010 – 1 ; CAT II

• Protection class: class III

• Withstand voltage:

1500V AC for one minute between electrical circuit and

housing case.

• Self-Check facility:

Lead wire connection to C and P terminals and proper

auxiliary earth resistance can be checked by pressing

“BATT.CHECK” button. “OK” lamp is illuminated.

• Batteries: 8pcs. 1.5V AA battery or equivalent

• Dimensions: 140(L)×140(W)×90(D)mm

• Weight: 800g approx.

• Accessories:

Test leads (red-15m, yellow-10m,green-5m)

Auxiliary earth bars carrying case.

2. Specifications 3. Designations

① OK lamp ② Function switch buttons

③ Ohm range switch buttons ④ Terminals

⑤ Scale plate ⑥ Panel

4. How to make measurements

4-1 Preparation for measurement

A maximum of 130V DC is present across E and C

or E and P terminals during measurement or when

“SIMPLIFIED MEAS.” Button is pressed. Also, it is

present across P and C terminals when “BATT.

CHECK” button is pressed. Therefore, never touch

these terminals with hand. Always, press “BATT.

CHECK” button after use so that all the range and

function switch buttons are in off (up) position.

Then, release “BATT.CHECK” button.

WARNING

4.1.1 Meter zero adjust

Check to see if the meter pointer is adjusted exactly to

the mechanical zero position of the Ω or V scale. If the

pointer is off the zero position in either left or right

direction open the panel and turn the zero adjust screw

behind the panel with a screwdriver. The panel can be

lifted up to 90 degrees by holding both sides as shown

below.

4.1.2 Connection of lead wires

As shown in Fig.3,stick the earth bars P and C deep

into the earth.

They should be aligned at an interval of 5m to 10m from

the earthed equipment e. Connect the green lead wire

to the terminal E of the instrument, yellow wire to

terminal P and red wire to terminal C. Make sure to

stick the auxiliary earth bars in the moist part of the

earth. Give enough water where the auxiliary earth bars

have to be stuck into the dry, stony or sandy part of the

earth so that it may become moist.

Where it is not possible to drive the auxiliary earth bars

into a hard surface such as concrete ground, lay the

earth bars there, covet them with a cloth and put water

(preferably salt water).This may allow earth resistance

measurements. (However, this is not possible with

asphalt ground)

NOTE:

When connecting the lead wires, make sure that

they are separated. If the measurement is made with

the lead wires twisted or in touch with each other i t

03 04 05

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER

User’s Manual

• The latest circuit design permits the instrument to

operate with the minimum of influence from earth

voltage and dearth resistance of auxiliary earth bars.

• Auxiliary earth resistance and lead wire connection

can be self-checked by pressing “BATT.CHECK”

button. “OK” lamp lights up when the instrument is

ready for accurate earth resistance measurements.

• Low power consumption Only 12V/100mA max.

• Push switch buttons permit smooth operation of the

instrument .

• Earth resistance value can be read directly from the

scale.

• Simplified measurement can be easily made by

pressing th “Simplified Meas.” Switch button only. No

need to use a shorting wire as terminals P and C and be

internally shorted by pressing this switch.

• Battery replacement can be easily made without

removing the carrying case.

• Hard plastic carrying case is water resistant and

accommodates all accessories.

1. Features

01 02

• Measuring ranges:

Earth resistance: 10/100/1000Ω

Earth voltage: 30V AC (5KΩ/V approx.)

• Accuracy:

Earth resistance Within ±5% of full scale

Earth voltage Within ±5% of full scale

• Measurement system:

Earth resistance

By constant current inverter.

800Hz approx,2mA

Earth voltage

By rectifier type

5KΩ/V approx,40~500Hz

• Protection levels: EN 61010 – 1 ; CAT II

• Protection class: class III

• Withstand voltage:

1500V AC for one minute between electrical circuit and

housing case.

• Self-Check facility:

Lead wire connection to C and P terminals and proper

auxiliary earth resistance can be checked by pressing

“BATT.CHECK” button. “OK” lamp is illuminated.

• Batteries: 8pcs. 1.5V AA battery or equivalent

• Dimensions: 140(L)×140(W)×90(D)mm

• Weight: 800g approx.

• Accessories:

Test leads (red-15m, yellow-10m,green-5m)

Auxiliary earth bars carrying case.

2. Specifications 3. Designations

① OK lamp ② Function switch buttons

③ Ohm range switch buttons ④ Terminals

⑤ Scale plate ⑥ Panel

4. How to make measurements

4-1 Preparation for measurement

A maximum of 130V DC is present across E and C

or E and P terminals during measurement or when

“SIMPLIFIED MEAS.” Button is pressed. Also, it is

present across P and C terminals when “BATT.

CHECK” button is pressed. Therefore, never touch

these terminals with hand. Always, press “BATT.

CHECK” button after use so that all the range and

function switch buttons are in off (up) position.

Then, release “BATT.CHECK” button.

WARNING

4.1.1 Meter zero adjust

Check to see if the meter pointer is adjusted exactly to

the mechanical zero position of the Ω or V scale. If the

pointer is off the zero position in either left or right

direction open the panel and turn the zero adjust screw

behind the panel with a screwdriver. The panel can be

lifted up to 90 degrees by holding both sides as shown

below.

4.1.2 Connection of lead wires

As shown in Fig.3,stick the earth bars P and C deep

into the earth.

They should be aligned at an interval of 5m to 10m from

the earthed equipment e. Connect the green lead wire

to the terminal E of the instrument, yellow wire to

terminal P and red wire to terminal C. Make sure to

stick the auxiliary earth bars in the moist part of the

earth. Give enough water where the auxiliary earth bars

have to be stuck into the dry, stony or sandy part of the

earth so that it may become moist.

Where it is not possible to drive the auxiliary earth bars

into a hard surface such as concrete ground, lay the

earth bars there, covet them with a cloth and put water

(preferably salt water).This may allow earth resistance

measurements. (However, this is not possible with

asphalt ground)

NOTE:

When connecting the lead wires, make sure that

they are separated. If the measurement is made with

the lead wires twisted or in touch with each other i t

03 04 05

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER

User’s Manual

• The latest circuit design permits the instrument to

operate with the minimum of influence from earth

voltage and dearth resistance of auxiliary earth bars.

• Auxiliary earth resistance and lead wire connection

can be self-checked by pressing “BATT.CHECK”

button. “OK” lamp lights up when the instrument is

ready for accurate earth resistance measurements.

• Low power consumption Only 12V/100mA max.

• Push switch buttons permit smooth operation of the

instrument .

• Earth resistance value can be read directly from the

scale.

• Simplified measurement can be easily made by

pressing th “Simplified Meas.” Switch button only. No

need to use a shorting wire as terminals P and C and be

internally shorted by pressing this switch.

• Battery replacement can be easily made without

removing the carrying case.

• Hard plastic carrying case is water resistant and

accommodates all accessories.

1. Features

01 02

• Measuring ranges:

Earth resistance: 10/100/1000Ω

Earth voltage: 30V AC (5KΩ/V approx.)

• Accuracy:

Earth resistance Within ±5% of full scale

Earth voltage Within ±5% of full scale

• Measurement system:

Earth resistance

By constant current inverter.

800Hz approx,2mA

Earth voltage

By rectifier type

5KΩ/V approx,40~500Hz

• Protection levels: EN 61010 – 1 ; CAT II

• Protection class: class III

• Withstand voltage:

1500V AC for one minute between electrical circuit and

housing case.

• Self-Check facility:

Lead wire connection to C and P terminals and proper

auxiliary earth resistance can be checked by pressing

“BATT.CHECK” button. “OK” lamp is illuminated.

• Batteries: 8pcs. 1.5V AA battery or equivalent

• Dimensions: 140(L)×140(W)×90(D)mm

• Weight: 800g approx.

• Accessories:

Test leads (red-15m, yellow-10m,green-5m)

Auxiliary earth bars carrying case.

2. Specifications 3. Designations

① OK lamp ② Function switch buttons

③ Ohm range switch buttons ④ Terminals

⑤ Scale plate ⑥ Panel

4. How to make measurements

4-1 Preparation for measurement

A maximum of 130V DC is present across E and C

or E and P terminals during measurement or when

“SIMPLIFIED MEAS.” Button is pressed. Also, it is

present across P and C terminals when “BATT.

CHECK” button is pressed. Therefore, never touch

these terminals with hand. Always, press “BATT.

CHECK” button after use so that all the range and

function switch buttons are in off (up) position.

Then, release “BATT.CHECK” button.

WARNING

4.1.1 Meter zero adjust

Check to see if the meter pointer is adjusted exactly to

the mechanical zero position of the Ω or V scale. If the

pointer is off the zero position in either left or right

direction open the panel and turn the zero adjust screw

behind the panel with a screwdriver. The panel can be

lifted up to 90 degrees by holding both sides as shown

below.

4.1.2 Connection of lead wires

As shown in Fig.3,stick the earth bars P and C deep

into the earth.

They should be aligned at an interval of 5m to 10m from

the earthed equipment e. Connect the green lead wire

to the terminal E of the instrument, yellow wire to

terminal P and red wire to terminal C. Make sure to

stick the auxiliary earth bars in the moist part of the

earth. Give enough water where the auxiliary earth bars

have to be stuck into the dry, stony or sandy part of the

earth so that it may become moist.

Where it is not possible to drive the auxiliary earth bars

into a hard surface such as concrete ground, lay the

earth bars there, covet them with a cloth and put water

(preferably salt water).This may allow earth resistance

measurements. (However, this is not possible with

asphalt ground)

NOTE:

When connecting the lead wires, make sure that

they are separated. If the measurement is made with

the lead wires twisted or in touch with each other i t

03 04 05

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER

08 09

will be affected by the induction of current or voltage.

When the resistance of auxiliary earth bars exceeds

2KΩ it may result in measurement errors. Therefore, be

careful in sticking the auxiliary earth bars P1 and C1

into the moist earth. Also, ensure sufficient connections

between the respective terminals and lead wires.

4-2 Earth voltage measurement of earthed

equipment under test

Press the AC V button and check earth voltage. Earth

voltage will be indicated on the V scale. When earth

voltage is more than 5V it may result in errors in earth

resistance measurement. To avoid this make earth

resistance measurement after turning off the power

source of the equipment under test or reducing earth

voltage.

Note:

Even when either of range switch buttons x1Ω,

x10Ω and x100Ω is pressed it does not affect earth

voltage measurement.

4-3 Checking battery voltage & lead wire connection

With ”BATT.CHECK” button pressed, the following can

be checked simultaneously:

4-3-1 Battery voltage

Battery voltage is sufficient when the meter pointer

stays in GOOD area of the battery check scale. If not,

replace with the new batteries in accordance with

instructions given in section 5.

4-3-2 Lead wire connection

“OK” lamp lights up when lead wire connection to P

and C terminals is good and earth resistance of

auxiliary earth is within a limit of tolerance. If it does

not illuminate, check for lead wire connection to P and

C terminals or lower auxiliary earth resistance to a

proper level by changing earth bar location or making

the ground moist with water.

Red and yellow lead wires can be checked for possible

breakage by shorting the alligator clips at the end of

each wire.

NOTE:

There is no need for lead wire connection when

battery voltage only is checked. Simply push

“BATT.CHECK” button. “OK” lamp will not

illuminate.

4-4 Earth resistance measurement

Press either of x1Ω,x10Ω and x100Ω range switch

buttons. Then press the “MEAS.” Button. Multiply the

reading by 10 at x10Ω or 100 at x100Ω.

“OK” lamp is on when the instrument is in normal

operation. If not, it indicates an excessive earth

resistance across C and E terminals that does not

permit a normal operation. Recheck for possible

contact between each lead wire and earth resistance

of auxiliary earth bars in accordance with the

instructions give in section 4-3. In case “OK” lamp does

not illuminate and the meter pointer deflects up full

scale despite all preceding checks, possible causes

are considered an abnormal condition existing in

earthed equipment under test, breakage of connection

wires from that equipment or breakage of the green

lead wire.

4-5.Simplified earth resistance measurement method

4-5-1 This method is recommended where an earth

resistance higher than 10 ohms is measured or where

it is not possible to drive auxiliary earth bars. An

approximate value of earth resistance can be obtained

by the two wire system which utilizes existing earthed

equipment as shown in Fig.4.

4-5-2 Measurement methods are illustrated in Fig.4.

NOTE:

When making earth resistance measurements

using commercial power supply(A),make sure that

earth side is connected to P terminal.

4-5-3 Press “AC V” button as outlined in section 4-2 for

earth voltage measurement of equipment under test

and make certain that earth voltage is below 2V.

4-5-4 First press “x10Ω” button and “MEAS.” button

next Then read earth resistance. When the meter

pointer deflects up full scale, press “x100Ω” button.

The reading obtained (RE) is and approximate earth

resistance value. There is no need for external

shorting as P and C terminals are internally shorted.

Since measuring current is as low as 2mA, the earth

leakage breaker (ELCB) does not trip even if the earth

side of the commercial power supply with an ELCB is

used.

“OK” lamp is illuminated when the instrument is in

normal operation, whether the simplified measurement

or normal measurement method is employed.

4-5-5 When the instrument is in working condition, “OK”

lamp is illuminated whether the simplified or ordinary

measurement is made (This indicates continuity

between P plus C terminals and E terminal).However,

lead wire connection to P plus C terminals and E

terminal). However, lead wire connection to P and C

terminals cannot be checked even when “BATT.

CHECK” is pressed as the lead wire is not connected

to C terminal.

4-5-6 In case of the simplified measurement method

where the two terminals only are used, earth

resistance “re” of an earthed electrode connecting to

P terminal will necessarily be added to a true earth

resistance value “REX”. Therefore, the earth

resistance reading is given as:

RE=REX+re.

If “re” is a known value as follows:

Supposing that RE is 100Ω and an earth resistance to be

measured is 100Ω,for example, the true earth resistance

value may be expressed as:

REX=(100Ω)-re.

Since re is greater than 0(zero),a true earth resistance

may be give as:

REX≤100Ω

In case we measure earth resistance not greater than

several tens of ohms we may consider the earth

resistance reading obtained as a true value.

5 Battery replacement

1. Raise the panel by 90 degrees until it locks.

2. Push the “Holder” pressing the upper section of the

battery case toward the panel as shown in Fig.5.

The battery case will come up.

3. Then, pull out the battery case.

4. Remove the battery hook on the bottom of the

battery case. Empty the battery case and install new

batteries.

5. Eight pieces of AA battery are used Install them

according to the markings on the battery case.

6. Fit in the battery hook with polarity in correct position

and push back the battery case until it catches the

holder.

SAFETY WARNING

1. this instrument must be used by a competent,

trained person and operated in strict accordance

with the instructions.

2. my company will not accept liability for any damage

or injury caused by misuse or non-compliance with

the instructions or safety procedures.

3. it is essential to read and understand the safety

rules contained in the instructions. they must be

observed when using the instrument.

00-05-0922

06 07

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTERANALOG EARTH RESISTANCE TESTER

08 09

will be affected by the induction of current or voltage.

When the resistance of auxiliary earth bars exceeds

2KΩ it may result in measurement errors. Therefore, be

careful in sticking the auxiliary earth bars P1 and C1

into the moist earth. Also, ensure sufficient connections

between the respective terminals and lead wires.

4-2 Earth voltage measurement of earthed

equipment under test

Press the AC V button and check earth voltage. Earth

voltage will be indicated on the V scale. When earth

voltage is more than 5V it may result in errors in earth

resistance measurement. To avoid this make earth

resistance measurement after turning off the power

source of the equipment under test or reducing earth

voltage.

Note:

Even when either of range switch buttons x1Ω,

x10Ω and x100Ω is pressed it does not affect earth

voltage measurement.

4-3 Checking battery voltage & lead wire connection

With ”BATT.CHECK” button pressed, the following can

be checked simultaneously:

4-3-1 Battery voltage

Battery voltage is sufficient when the meter pointer

stays in GOOD area of the battery check scale. If not,

replace with the new batteries in accordance with

instructions given in section 5.

4-3-2 Lead wire connection

“OK” lamp lights up when lead wire connection to P

and C terminals is good and earth resistance of

auxiliary earth is within a limit of tolerance. If it does

not illuminate, check for lead wire connection to P and

C terminals or lower auxiliary earth resistance to a

proper level by changing earth bar location or making

the ground moist with water.

Red and yellow lead wires can be checked for possible

breakage by shorting the alligator clips at the end of

each wire.

NOTE:

There is no need for lead wire connection when

battery voltage only is checked. Simply push

“BATT.CHECK” button. “OK” lamp will not

illuminate.

4-4 Earth resistance measurement

Press either of x1Ω,x10Ω and x100Ω range switch

buttons. Then press the “MEAS.” Button. Multiply the

reading by 10 at x10Ω or 100 at x100Ω.

“OK” lamp is on when the instrument is in normal

operation. If not, it indicates an excessive earth

resistance across C and E terminals that does not

permit a normal operation. Recheck for possible

contact between each lead wire and earth resistance

of auxiliary earth bars in accordance with the

instructions give in section 4-3. In case “OK” lamp does

not illuminate and the meter pointer deflects up full

scale despite all preceding checks, possible causes

are considered an abnormal condition existing in

earthed equipment under test, breakage of connection

wires from that equipment or breakage of the green

lead wire.

4-5.Simplified earth resistance measurement method

4-5-1 This method is recommended where an earth

resistance higher than 10 ohms is measured or where

it is not possible to drive auxiliary earth bars. An

approximate value of earth resistance can be obtained

by the two wire system which utilizes existing earthed

equipment as shown in Fig.4.

4-5-2 Measurement methods are illustrated in Fig.4.

NOTE:

When making earth resistance measurements

using commercial power supply(A),make sure that

earth side is connected to P terminal.

4-5-3 Press “AC V” button as outlined in section 4-2 for

earth voltage measurement of equipment under test

and make certain that earth voltage is below 2V.

4-5-4 First press “x10Ω” button and “MEAS.” button

next Then read earth resistance. When the meter

pointer deflects up full scale, press “x100Ω” button.

The reading obtained (RE) is and approximate earth

resistance value. There is no need for external

shorting as P and C terminals are internally shorted.

Since measuring current is as low as 2mA, the earth

leakage breaker (ELCB) does not trip even if the earth

side of the commercial power supply with an ELCB is

used.

“OK” lamp is illuminated when the instrument is in

normal operation, whether the simplified measurement

or normal measurement method is employed.

4-5-5 When the instrument is in working condition, “OK”

lamp is illuminated whether the simplified or ordinary

measurement is made (This indicates continuity

between P plus C terminals and E terminal).However,

lead wire connection to P plus C terminals and E

terminal). However, lead wire connection to P and C

terminals cannot be checked even when “BATT.

CHECK” is pressed as the lead wire is not connected

to C terminal.

4-5-6 In case of the simplified measurement method

where the two terminals only are used, earth

resistance “re” of an earthed electrode connecting to

P terminal will necessarily be added to a true earth

resistance value “REX”. Therefore, the earth

resistance reading is given as:

RE=REX+re.

If “re” is a known value as follows:

Supposing that RE is 100Ω and an earth resistance to be

measured is 100Ω,for example, the true earth resistance

value may be expressed as:

REX=(100Ω)-re.

Since re is greater than 0(zero),a true earth resistance

may be give as:

REX≤100Ω

In case we measure earth resistance not greater than

several tens of ohms we may consider the earth

resistance reading obtained as a true value.

5 Battery replacement

1. Raise the panel by 90 degrees until it locks.

2. Push the “Holder” pressing the upper section of the

battery case toward the panel as shown in Fig.5.

The battery case will come up.

3. Then, pull out the battery case.

4. Remove the battery hook on the bottom of the

battery case. Empty the battery case and install new

batteries.

5. Eight pieces of AA battery are used Install them

according to the markings on the battery case.

6. Fit in the battery hook with polarity in correct position

and push back the battery case until it catches the

holder.

SAFETY WARNING

1. this instrument must be used by a competent,

trained person and operated in strict accordance

with the instructions.

2. my company will not accept liability for any damage

or injury caused by misuse or non-compliance with

the instructions or safety procedures.

3. it is essential to read and understand the safety

rules contained in the instructions. they must be

observed when using the instrument.

00-05-0922

06 07

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTERANALOG EARTH RESISTANCE TESTER

08 09

will be affected by the induction of current or voltage.

When the resistance of auxiliary earth bars exceeds

2KΩ it may result in measurement errors. Therefore, be

careful in sticking the auxiliary earth bars P1 and C1

into the moist earth. Also, ensure sufficient connections

between the respective terminals and lead wires.

4-2 Earth voltage measurement of earthed

equipment under test

Press the AC V button and check earth voltage. Earth

voltage will be indicated on the V scale. When earth

voltage is more than 5V it may result in errors in earth

resistance measurement. To avoid this make earth

resistance measurement after turning off the power

source of the equipment under test or reducing earth

voltage.

Note:

Even when either of range switch buttons x1Ω,

x10Ω and x100Ω is pressed it does not affect earth

voltage measurement.

4-3 Checking battery voltage & lead wire connection

With ”BATT.CHECK” button pressed, the following can

be checked simultaneously:

4-3-1 Battery voltage

Battery voltage is sufficient when the meter pointer

stays in GOOD area of the battery check scale. If not,

replace with the new batteries in accordance with

instructions given in section 5.

4-3-2 Lead wire connection

“OK” lamp lights up when lead wire connection to P

and C terminals is good and earth resistance of

auxiliary earth is within a limit of tolerance. If it does

not illuminate, check for lead wire connection to P and

C terminals or lower auxiliary earth resistance to a

proper level by changing earth bar location or making

the ground moist with water.

Red and yellow lead wires can be checked for possible

breakage by shorting the alligator clips at the end of

each wire.

NOTE:

There is no need for lead wire connection when

battery voltage only is checked. Simply push

“BATT.CHECK” button. “OK” lamp will not

illuminate.

4-4 Earth resistance measurement

Press either of x1Ω,x10Ω and x100Ω range switch

buttons. Then press the “MEAS.” Button. Multiply the

reading by 10 at x10Ω or 100 at x100Ω.

“OK” lamp is on when the instrument is in normal

operation. If not, it indicates an excessive earth

resistance across C and E terminals that does not

permit a normal operation. Recheck for possible

contact between each lead wire and earth resistance

of auxiliary earth bars in accordance with the

instructions give in section 4-3. In case “OK” lamp does

not illuminate and the meter pointer deflects up full

scale despite all preceding checks, possible causes

are considered an abnormal condition existing in

earthed equipment under test, breakage of connection

wires from that equipment or breakage of the green

lead wire.

4-5.Simplified earth resistance measurement method

4-5-1 This method is recommended where an earth

resistance higher than 10 ohms is measured or where

it is not possible to drive auxiliary earth bars. An

approximate value of earth resistance can be obtained

by the two wire system which utilizes existing earthed

equipment as shown in Fig.4.

4-5-2 Measurement methods are illustrated in Fig.4.

NOTE:

When making earth resistance measurements

using commercial power supply(A),make sure that

earth side is connected to P terminal.

4-5-3 Press “AC V” button as outlined in section 4-2 for

earth voltage measurement of equipment under test

and make certain that earth voltage is below 2V.

4-5-4 First press “x10Ω” button and “MEAS.” button

next Then read earth resistance. When the meter

pointer deflects up full scale, press “x100Ω” button.

The reading obtained (RE) is and approximate earth

resistance value. There is no need for external

shorting as P and C terminals are internally shorted.

Since measuring current is as low as 2mA, the earth

leakage breaker (ELCB) does not trip even if the earth

side of the commercial power supply with an ELCB is

used.

“OK” lamp is illuminated when the instrument is in

normal operation, whether the simplified measurement

or normal measurement method is employed.

4-5-5 When the instrument is in working condition, “OK”

lamp is illuminated whether the simplified or ordinary

measurement is made (This indicates continuity

between P plus C terminals and E terminal).However,

lead wire connection to P plus C terminals and E

terminal). However, lead wire connection to P and C

terminals cannot be checked even when “BATT.

CHECK” is pressed as the lead wire is not connected

to C terminal.

4-5-6 In case of the simplified measurement method

where the two terminals only are used, earth

resistance “re” of an earthed electrode connecting to

P terminal will necessarily be added to a true earth

resistance value “REX”. Therefore, the earth

resistance reading is given as:

RE=REX+re.

If “re” is a known value as follows:

Supposing that RE is 100Ω and an earth resistance to be

measured is 100Ω,for example, the true earth resistance

value may be expressed as:

REX=(100Ω)-re.

Since re is greater than 0(zero),a true earth resistance

may be give as:

REX≤100Ω

In case we measure earth resistance not greater than

several tens of ohms we may consider the earth

resistance reading obtained as a true value.

5 Battery replacement

1. Raise the panel by 90 degrees until it locks.

2. Push the “Holder” pressing the upper section of the

battery case toward the panel as shown in Fig.5.

The battery case will come up.

3. Then, pull out the battery case.

4. Remove the battery hook on the bottom of the

battery case. Empty the battery case and install new

batteries.

5. Eight pieces of AA battery are used Install them

according to the markings on the battery case.

6. Fit in the battery hook with polarity in correct position

and push back the battery case until it catches the

holder.

SAFETY WARNING

1. this instrument must be used by a competent,

trained person and operated in strict accordance

with the instructions.

2. my company will not accept liability for any damage

or injury caused by misuse or non-compliance with

the instructions or safety procedures.

3. it is essential to read and understand the safety

rules contained in the instructions. they must be

observed when using the instrument.

00-05-0922

06 07

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTERANALOG EARTH RESISTANCE TESTER

08 09

will be affected by the induction of current or voltage.

When the resistance of auxiliary earth bars exceeds

2KΩ it may result in measurement errors. Therefore, be

careful in sticking the auxiliary earth bars P1 and C1

into the moist earth. Also, ensure sufficient connections

between the respective terminals and lead wires.

4-2 Earth voltage measurement of earthed

equipment under test

Press the AC V button and check earth voltage. Earth

voltage will be indicated on the V scale. When earth

voltage is more than 5V it may result in errors in earth

resistance measurement. To avoid this make earth

resistance measurement after turning off the power

source of the equipment under test or reducing earth

voltage.

Note:

Even when either of range switch buttons x1Ω,

x10Ω and x100Ω is pressed it does not affect earth

voltage measurement.

4-3 Checking battery voltage & lead wire connection

With ”BATT.CHECK” button pressed, the following can

be checked simultaneously:

4-3-1 Battery voltage

Battery voltage is sufficient when the meter pointer

stays in GOOD area of the battery check scale. If not,

replace with the new batteries in accordance with

instructions given in section 5.

4-3-2 Lead wire connection

“OK” lamp lights up when lead wire connection to P

and C terminals is good and earth resistance of

auxiliary earth is within a limit of tolerance. If it does

not illuminate, check for lead wire connection to P and

C terminals or lower auxiliary earth resistance to a

proper level by changing earth bar location or making

the ground moist with water.

Red and yellow lead wires can be checked for possible

breakage by shorting the alligator clips at the end of

each wire.

NOTE:

There is no need for lead wire connection when

battery voltage only is checked. Simply push

“BATT.CHECK” button. “OK” lamp will not

illuminate.

4-4 Earth resistance measurement

Press either of x1Ω,x10Ω and x100Ω range switch

buttons. Then press the “MEAS.” Button. Multiply the

reading by 10 at x10Ω or 100 at x100Ω.

“OK” lamp is on when the instrument is in normal

operation. If not, it indicates an excessive earth

resistance across C and E terminals that does not

permit a normal operation. Recheck for possible

contact between each lead wire and earth resistance

of auxiliary earth bars in accordance with the

instructions give in section 4-3. In case “OK” lamp does

not illuminate and the meter pointer deflects up full

scale despite all preceding checks, possible causes

are considered an abnormal condition existing in

earthed equipment under test, breakage of connection

wires from that equipment or breakage of the green

lead wire.

4-5.Simplified earth resistance measurement method

4-5-1 This method is recommended where an earth

resistance higher than 10 ohms is measured or where

it is not possible to drive auxiliary earth bars. An

approximate value of earth resistance can be obtained

by the two wire system which utilizes existing earthed

equipment as shown in Fig.4.

4-5-2 Measurement methods are illustrated in Fig.4.

NOTE:

When making earth resistance measurements

using commercial power supply(A),make sure that

earth side is connected to P terminal.

4-5-3 Press “AC V” button as outlined in section 4-2 for

earth voltage measurement of equipment under test

and make certain that earth voltage is below 2V.

4-5-4 First press “x10Ω” button and “MEAS.” button

next Then read earth resistance. When the meter

pointer deflects up full scale, press “x100Ω” button.

The reading obtained (RE) is and approximate earth

resistance value. There is no need for external

shorting as P and C terminals are internally shorted.

Since measuring current is as low as 2mA, the earth

leakage breaker (ELCB) does not trip even if the earth

side of the commercial power supply with an ELCB is

used.

“OK” lamp is illuminated when the instrument is in

normal operation, whether the simplified measurement

or normal measurement method is employed.

4-5-5 When the instrument is in working condition, “OK”

lamp is illuminated whether the simplified or ordinary

measurement is made (This indicates continuity

between P plus C terminals and E terminal).However,

lead wire connection to P plus C terminals and E

terminal). However, lead wire connection to P and C

terminals cannot be checked even when “BATT.

CHECK” is pressed as the lead wire is not connected

to C terminal.

4-5-6 In case of the simplified measurement method

where the two terminals only are used, earth

resistance “re” of an earthed electrode connecting to

P terminal will necessarily be added to a true earth

resistance value “REX”. Therefore, the earth

resistance reading is given as:

RE=REX+re.

If “re” is a known value as follows:

Supposing that RE is 100Ω and an earth resistance to be

measured is 100Ω,for example, the true earth resistance

value may be expressed as:

REX=(100Ω)-re.

Since re is greater than 0(zero),a true earth resistance

may be give as:

REX≤100Ω

In case we measure earth resistance not greater than

several tens of ohms we may consider the earth

resistance reading obtained as a true value.

5 Battery replacement

1. Raise the panel by 90 degrees until it locks.

2. Push the “Holder” pressing the upper section of the

battery case toward the panel as shown in Fig.5.

The battery case will come up.

3. Then, pull out the battery case.

4. Remove the battery hook on the bottom of the

battery case. Empty the battery case and install new

batteries.

5. Eight pieces of AA battery are used Install them

according to the markings on the battery case.

6. Fit in the battery hook with polarity in correct position

and push back the battery case until it catches the

holder.

SAFETY WARNING

1. this instrument must be used by a competent,

trained person and operated in strict accordance

with the instructions.

2. my company will not accept liability for any damage

or injury caused by misuse or non-compliance with

the instructions or safety procedures.

3. it is essential to read and understand the safety

rules contained in the instructions. they must be

observed when using the instrument.

00-05-0922

06 07

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTERANALOG EARTH RESISTANCE TESTER

08 09

will be affected by the induction of current or voltage.

When the resistance of auxiliary earth bars exceeds

2KΩ it may result in measurement errors. Therefore, be

careful in sticking the auxiliary earth bars P1 and C1

into the moist earth. Also, ensure sufficient connections

between the respective terminals and lead wires.

4-2 Earth voltage measurement of earthed

equipment under test

Press the AC V button and check earth voltage. Earth

voltage will be indicated on the V scale. When earth

voltage is more than 5V it may result in errors in earth

resistance measurement. To avoid this make earth

resistance measurement after turning off the power

source of the equipment under test or reducing earth

voltage.

Note:

Even when either of range switch buttons x1Ω,

x10Ω and x100Ω is pressed it does not affect earth

voltage measurement.

4-3 Checking battery voltage & lead wire connection

With ”BATT.CHECK” button pressed, the following can

be checked simultaneously:

4-3-1 Battery voltage

Battery voltage is sufficient when the meter pointer

stays in GOOD area of the battery check scale. If not,

replace with the new batteries in accordance with

instructions given in section 5.

4-3-2 Lead wire connection

“OK” lamp lights up when lead wire connection to P

and C terminals is good and earth resistance of

auxiliary earth is within a limit of tolerance. If it does

not illuminate, check for lead wire connection to P and

C terminals or lower auxiliary earth resistance to a

proper level by changing earth bar location or making

the ground moist with water.

Red and yellow lead wires can be checked for possible

breakage by shorting the alligator clips at the end of

each wire.

NOTE:

There is no need for lead wire connection when

battery voltage only is checked. Simply push

“BATT.CHECK” button. “OK” lamp will not

illuminate.

4-4 Earth resistance measurement

Press either of x1Ω,x10Ω and x100Ω range switch

buttons. Then press the “MEAS.” Button. Multiply the

reading by 10 at x10Ω or 100 at x100Ω.

“OK” lamp is on when the instrument is in normal

operation. If not, it indicates an excessive earth

resistance across C and E terminals that does not

permit a normal operation. Recheck for possible

contact between each lead wire and earth resistance

of auxiliary earth bars in accordance with the

instructions give in section 4-3. In case “OK” lamp does

not illuminate and the meter pointer deflects up full

scale despite all preceding checks, possible causes

are considered an abnormal condition existing in

earthed equipment under test, breakage of connection

wires from that equipment or breakage of the green

lead wire.

4-5.Simplified earth resistance measurement method

4-5-1 This method is recommended where an earth

resistance higher than 10 ohms is measured or where

it is not possible to drive auxiliary earth bars. An

approximate value of earth resistance can be obtained

by the two wire system which utilizes existing earthed

equipment as shown in Fig.4.

4-5-2 Measurement methods are illustrated in Fig.4.

NOTE:

When making earth resistance measurements

using commercial power supply(A),make sure that

earth side is connected to P terminal.

4-5-3 Press “AC V” button as outlined in section 4-2 for

earth voltage measurement of equipment under test

and make certain that earth voltage is below 2V.

4-5-4 First press “x10Ω” button and “MEAS.” button

next Then read earth resistance. When the meter

pointer deflects up full scale, press “x100Ω” button.

The reading obtained (RE) is and approximate earth

resistance value. There is no need for external

shorting as P and C terminals are internally shorted.

Since measuring current is as low as 2mA, the earth

leakage breaker (ELCB) does not trip even if the earth

side of the commercial power supply with an ELCB is

used.

“OK” lamp is illuminated when the instrument is in

normal operation, whether the simplified measurement

or normal measurement method is employed.

4-5-5 When the instrument is in working condition, “OK”

lamp is illuminated whether the simplified or ordinary

measurement is made (This indicates continuity

between P plus C terminals and E terminal).However,

lead wire connection to P plus C terminals and E

terminal). However, lead wire connection to P and C

terminals cannot be checked even when “BATT.

CHECK” is pressed as the lead wire is not connected

to C terminal.

4-5-6 In case of the simplified measurement method

where the two terminals only are used, earth

resistance “re” of an earthed electrode connecting to

P terminal will necessarily be added to a true earth

resistance value “REX”. Therefore, the earth

resistance reading is given as:

RE=REX+re.

If “re” is a known value as follows:

Supposing that RE is 100Ω and an earth resistance to be

measured is 100Ω,for example, the true earth resistance

value may be expressed as:

REX=(100Ω)-re.

Since re is greater than 0(zero),a true earth resistance

may be give as:

REX≤100Ω

In case we measure earth resistance not greater than

several tens of ohms we may consider the earth

resistance reading obtained as a true value.

5 Battery replacement

1. Raise the panel by 90 degrees until it locks.

2. Push the “Holder” pressing the upper section of the

battery case toward the panel as shown in Fig.5.

The battery case will come up.

3. Then, pull out the battery case.

4. Remove the battery hook on the bottom of the

battery case. Empty the battery case and install new

batteries.

5. Eight pieces of AA battery are used Install them

according to the markings on the battery case.

6. Fit in the battery hook with polarity in correct position

and push back the battery case until it catches the

holder.

SAFETY WARNING

1. this instrument must be used by a competent,

trained person and operated in strict accordance

with the instructions.

2. my company will not accept liability for any damage

or injury caused by misuse or non-compliance with

the instructions or safety procedures.

3. it is essential to read and understand the safety

rules contained in the instructions. they must be

observed when using the instrument.

00-05-0922

06 07

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTERANALOG EARTH RESISTANCE TESTER

08 09

will be affected by the induction of current or voltage.

When the resistance of auxiliary earth bars exceeds

2KΩ it may result in measurement errors. Therefore, be

careful in sticking the auxiliary earth bars P1 and C1

into the moist earth. Also, ensure sufficient connections

between the respective terminals and lead wires.

4-2 Earth voltage measurement of earthed

equipment under test

Press the AC V button and check earth voltage. Earth

voltage will be indicated on the V scale. When earth

voltage is more than 5V it may result in errors in earth

resistance measurement. To avoid this make earth

resistance measurement after turning off the power

source of the equipment under test or reducing earth

voltage.

Note:

Even when either of range switch buttons x1Ω,

x10Ω and x100Ω is pressed it does not affect earth

voltage measurement.

4-3 Checking battery voltage & lead wire connection

With ”BATT.CHECK” button pressed, the following can

be checked simultaneously:

4-3-1 Battery voltage

Battery voltage is sufficient when the meter pointer

stays in GOOD area of the battery check scale. If not,

replace with the new batteries in accordance with

instructions given in section 5.

4-3-2 Lead wire connection

“OK” lamp lights up when lead wire connection to P

and C terminals is good and earth resistance of

auxiliary earth is within a limit of tolerance. If it does

not illuminate, check for lead wire connection to P and

C terminals or lower auxiliary earth resistance to a

proper level by changing earth bar location or making

the ground moist with water.

Red and yellow lead wires can be checked for possible

breakage by shorting the alligator clips at the end of

each wire.

NOTE:

There is no need for lead wire connection when

battery voltage only is checked. Simply push

“BATT.CHECK” button. “OK” lamp will not

illuminate.

4-4 Earth resistance measurement

Press either of x1Ω,x10Ω and x100Ω range switch

buttons. Then press the “MEAS.” Button. Multiply the

reading by 10 at x10Ω or 100 at x100Ω.

“OK” lamp is on when the instrument is in normal

operation. If not, it indicates an excessive earth

resistance across C and E terminals that does not

permit a normal operation. Recheck for possible

contact between each lead wire and earth resistance

of auxiliary earth bars in accordance with the

instructions give in section 4-3. In case “OK” lamp does

not illuminate and the meter pointer deflects up full

scale despite all preceding checks, possible causes

are considered an abnormal condition existing in

earthed equipment under test, breakage of connection

wires from that equipment or breakage of the green

lead wire.

4-5.Simplified earth resistance measurement method

4-5-1 This method is recommended where an earth

resistance higher than 10 ohms is measured or where

it is not possible to drive auxiliary earth bars. An

approximate value of earth resistance can be obtained

by the two wire system which utilizes existing earthed

equipment as shown in Fig.4.

4-5-2 Measurement methods are illustrated in Fig.4.

NOTE:

When making earth resistance measurements

using commercial power supply(A),make sure that

earth side is connected to P terminal.

4-5-3 Press “AC V” button as outlined in section 4-2 for

earth voltage measurement of equipment under test

and make certain that earth voltage is below 2V.

4-5-4 First press “x10Ω” button and “MEAS.” button

next Then read earth resistance. When the meter

pointer deflects up full scale, press “x100Ω” button.

The reading obtained (RE) is and approximate earth

resistance value. There is no need for external

shorting as P and C terminals are internally shorted.

Since measuring current is as low as 2mA, the earth

leakage breaker (ELCB) does not trip even if the earth

side of the commercial power supply with an ELCB is

used.

“OK” lamp is illuminated when the instrument is in

normal operation, whether the simplified measurement

or normal measurement method is employed.

4-5-5 When the instrument is in working condition, “OK”

lamp is illuminated whether the simplified or ordinary

measurement is made (This indicates continuity

between P plus C terminals and E terminal).However,

lead wire connection to P plus C terminals and E

terminal). However, lead wire connection to P and C

terminals cannot be checked even when “BATT.

CHECK” is pressed as the lead wire is not connected

to C terminal.

4-5-6 In case of the simplified measurement method

where the two terminals only are used, earth

resistance “re” of an earthed electrode connecting to

P terminal will necessarily be added to a true earth

resistance value “REX”. Therefore, the earth

resistance reading is given as:

RE=REX+re.

If “re” is a known value as follows:

Supposing that RE is 100Ω and an earth resistance to be

measured is 100Ω,for example, the true earth resistance

value may be expressed as:

REX=(100Ω)-re.

Since re is greater than 0(zero),a true earth resistance

may be give as:

REX≤100Ω

In case we measure earth resistance not greater than

several tens of ohms we may consider the earth

resistance reading obtained as a true value.

5 Battery replacement

1. Raise the panel by 90 degrees until it locks.

2. Push the “Holder” pressing the upper section of the

battery case toward the panel as shown in Fig.5.

The battery case will come up.

3. Then, pull out the battery case.

4. Remove the battery hook on the bottom of the

battery case. Empty the battery case and install new

batteries.

5. Eight pieces of AA battery are used Install them

according to the markings on the battery case.

6. Fit in the battery hook with polarity in correct position

and push back the battery case until it catches the

holder.

SAFETY WARNING

1. this instrument must be used by a competent,

trained person and operated in strict accordance

with the instructions.

2. my company will not accept liability for any damage

or injury caused by misuse or non-compliance with

the instructions or safety procedures.

3. it is essential to read and understand the safety

rules contained in the instructions. they must be

observed when using the instrument.

00-05-0922

06 07

ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTER ANALOG EARTH RESISTANCE TESTERANALOG EARTH RESISTANCE TESTER

Table of contents

Other Mastech Test Equipment manuals