Amprobe AMB-35 User Manual

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INSULATION TESTER

AMB-35

INSTRUCTION MANUAL

sACm:

REMEAD

HOLD

1. SAFETY INFORMATION

The circuit under test must be de-energized and isolated before

connections are made except for voltage measurements.

Verify operation prior to measuring hazardous voltages (voltage

above 30V AC rms, 42V AC peak and 60V DC). Do not touch the Circuit connections during a test. Disconnect the hot test lead before disconnecting the neutral

test lead.

After insulation tests, to protect against electric shock, capacitive

circuits must to be discharged.

Do not use the meter if the low battery indicator (

displayed.

Test leads (including crocodile clips) must be in good order,

clean with no breaks or cracks.

Do not use the meter if it looks damaged. Do not use the meter around explosive gases, vapors or dust. Do not push the test button before all connections and

preparations are complete. The instrument must only be used by

suitably trained and competent persons. Do not use the meter with any parts or cover removed. Do not use the meter in a wet environment.

U.S. PAT. NO. 478,017 JAPAN PAT. NO. 1180870 CHINA PAT. NO. ZL02367250.1

Warnings and Safety symbols:

Caution refer to this manual before using the meter.

Dangerous voltages.

Meter is protected throughout by double insulation or reinforced insulation.

Comply with IEC1010-1 When servicing, use only specified replacement parts.

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2. SPECIFICATIONS

2-1 General Information

Environment conditions:

c Installation CategoriesⅢ 1000V

Pollution Degree 2

e Altitude up to 2000 meters f Indoor use only

Safety Meets of IEC61010-1 and IEC61557

Display : Dual display, 3-3/4 Digital readout with analog bar

Sampling Rate : 2.5 sample/sec.

Manual data Memory and Read : Memory capacity 9 set.

Over Range Indicator : “

Low Battery Indication :

Operating Temperature and Humidity：

Temperature Coefficient : 0.10 x (specified accuracy)/ ℃

Storage Temperature and Humidity :

Battery : 6 x 1.5V “AA” battery.

Fuse : 6mm x 32mm (0.25 x 1.25 inch), 0.5A 1000V, Fast Acting.

Dimensions : 235 (L) x 116 (W) x 54(H) mm ,

Weight : Approx. 520g (1.15 LB), including batteries

Accessories : Test leads, 6pcs battery, Holster, operation manual.

indication.

” will be displayed.

The (

below the operating voltage.

0℃ to 50℃ (32℉ to 122℉) below 80% RH (noncondensing).

-10℃ to 60℃ (14℉ to 140℉) below 70% RH (noncondensing)

) will be displayed when the battery voltage drop

(9.3”L x 4.6”W x 2.1”H)

2-2 Electrical Specifications

Accuracies are specified as:

±(...% of reading + ...digits) at 23℃ ±5℃,below 80% RH.



Insulation Resistance

Range Resolution Accuracy Test Voltages

4MΩ/40MΩ/400M

1000MΩ/250V

4MΩ/40MΩ/400M

2000MΩ/500V

4MΩ/40MΩ/400M

4000MΩ/1000V

Analog Bar Graph

Nominal Current

Circuit Protection



LoΩ

Display Range

Measurement Range

Accuracy 2%+2

Resolution

Analog Bar Graph

Open Circuit Voltage 6V typical

Short Circuit Current

Circuit Protection



AC Voltage (40Hz〜500Hz)

Range Resolution Accuracy

1000V 1V 2%+1

Sensitivity : 2V

4MΩ: 1 KΩ

40MΩ: 10 K

400MΩ:100 K 4000MΩ: 10M

Test inhibited if input ≧ 30V AC or DC

200mA minimum, (0.2 to 2.0Ω)

Test inhibited if input ≧ 30V AC or DC.

3%+5

(<1000M)

5%+5

(>1000M)

0 to 4000MΩ

≧

1mA

40.00Ω

0.10Ω to 40.00Ω

0.01Ω

40.00Ω

Input

Impedance

2.5MΩ

250V+20% ~ -0%

500V+20% ~ -0%

1000V+20% ~ -0%

Overload

Protection 1000Vrms

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

DC Voltage

Range Resolution Accuracy Input Impedance Overload Protection 1000V

-1000V

1V 1%+1

2.5MΩ

1000Vrms

Sensitivity : 2V



Resistance & Continuity

Range Resolution Accuracy

9999

1Ω

1%+2 3V 1000Vrms

Max. open Circuit

Voltage

Overload

Protection

3. PARTS & CONTROLS

LCD display.

MEM key: Manual data memory control key.

LOCK key: Locks the Insulation test Resistance (MΩ) and Low resistan ce

(LoΩ) functions.

a). Press and hold down TEST key, then press LOCK key, the

“ LOCK ” icon appears on the display.

b). In MΩ mode continuously applies the test voltage to the circuit to

be tested. The beeper sounds every 2 seconds to remind you that you are in the LOCK mode.

c). In LoΩ mode continuously applied the test current to the circuit to

be tested.

d). Press Lock or TEST key again to exit the mode.

READ key: Manual memory data reading control key.

COM V

key: In the LoΩ function, turns the test lead resistance

compensation ON.

Touch the probe tips together, then press

the

icon appears on the display and the main

key,

display indicates 0.00Ω.

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MEM READ

HOLD

K M

TEST key:

a). Used for MΩ and LoΩ test functions.

b). Press and hold TEST key until the main display reading is stable.

▼▲

i j

keys : In READ mode, select the memory data location for

direct reading the data from the display.

Rotary switch: To select a measurement function.

Input terminals.

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Display :

MEM

READ

Manual data memory and read location indicator.

Beeper symbol shows if beeper turned on in

High voltage warning symbol flashes, if voltage ≧ 30V is present on the

probes.

Voltage applied to the probes in MΩ function, Resistance reading held

from the last measurement in MΩ and LoΩ functions and DC Voltage

reading in

Zero symbol is on if test leads are zeroed out.

Lock symbol is on if the TEST mode is locked in MΩ or LoΩ functions.

Low battery symbol.

Main display reading for all functions.

Analog bar graph displays resistance on a logarithmic scale and

voltage on a linear scale. The value always tracks the main display.

function.

4. BEFORE OPERATION

Warning

To avoid electrical shock remove the test leads before opening the

case or battery cover. Do not operate with battery cover open.

To avoid electrical shock when performing resistance tests, remove

all power from the circuit to be measured.

To avoid electrical shock, first connect the test leads to the meter

inputs before you make connection to the circuit under test.

To avoid electrical shock, do not touch the test lead tips, test points

or terminals when pressing TEST.

4-1 How to connect test leads.

Connect the red test lead into the “ VΩ ” jack and the black lead into the “ COM ” jack.

4-2 Battery Check & Replacement

1). If battery power is not sufficient, The LCD will display “ Replacement of 6 ea. new batteries, type 1.5V size “AA” is required.

2). Use a screw drive to unscrew the screw secured on battery cover. Take out the used batteries and replace 6 pcs new batteries.

3). Place back the battery cover and secure the screw.

4-3 Auto-Power-Off

1). The meter automatically turns off after 15 minutes of non-use. In

the LoΩ mode the meter turns off after 5 minutes of non-use.

2). To turn the meter back on, turn the rotary switch to OFF, then to the desired function.

4-4 Test Leads Check

Set the range select switch to the “ alligator clips to the test leads. Connect the alligator clips together. The indicator should read <0.5Ω. When the leads are not

connected the display will read infinity indicated by “

will ensure that test leads are under working condition.

” range. Connect the

－

”. This

”.

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4-5 Data Memory Storage and Read Modes:

1). Clearing the memorized data

c Set the function switch to the OFF position.

d Press and hold the "MEM" key, and rotate the function switch

to one of it’s operating modes. The "dEL" symbol will appear on the LCD indicating the memorized data has been erased.

2). Storing Manual data

c Press the "MEM" key each time, one set of data will be stored

into the memory. At this moment, the LCD will show the "MEM" mark and the memory address location. The total memory size is 9 sets.

d When the memory is full, the LCD will dispaly the number "9",

the last memory address location.

3). Read Manual memory data

c Press the "READ" key to enter the memory storage mode. The

LCD will display the "READ" symbol along with the memory address number.

d Press the " " or " " key to select the desired memory

address location.

e Press the " READ " key again to exit this mode.

1). Set the function switch to V position.

2). Connect red test lead to the “VΩ” jack and the black test lead to

3). Connect the probe IN PARALLEL with the circuit to be measured.

4). Read the voltage value from the display. The meter indicates DC

VOLTAGE MEASUREMENTS

the “COM” terminal.

voltage on the upper right of the display and the AC voltage on the main display.

6. Ω RESISTANCE AND CONTINUITY MEASUREMENTS

1). Set the function switch to

2). Connect the red test lead to “VΩ” terminal and the black test lead to “COM” terminal.

3). Connect the probes to the circuit to be measured. Measure the voltage first to ensure that no hazardous voltage is present, then switch to ohms.

4). Read the resistance value on the display. If the resistance is approximately 40Ω or less, the meter will beep.

position.

7. LOΩ LOW RESISTANCE MEASUREMENTS

7-1 Measuring Low Resistance

1). Set the function switch to LoΩ position.

2). Connect the red test lead to “VΩ” terminal and the black test lead to “COM” terminal.

3). Zero out the test lead resistance (see Zero key).

4). Connect the probes to the circuit to be measured, if there is voltage on the probes, the voltage will be displayed. A repetitive

beep will sound and the flashing high voltage symbol “ displayed to warn the user when the voltage is more than 30V.

” will be

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Please remove the voltage from the circuit under test before proceeding with the next step.

5). Press and hold the TEST key until a stable reading is displayed on the main display.

6). Release the TEST button. The upper right display holds the

resistance reading until a new test is started or a different function is selected.

7). Exchange the red (+) and black (-) probes on the circuit and repeat steps 5 and 6 to reverse the polarity of the test current. The reading should be the same as the previous. This test is useful to detect corroded connections, which can cause different reading for both polarities.

7-2 Using the LOCK Function to Measure Resistance

The LOCK function is used to continuously supply the test current to the circuit to be tested. This is useful for making several measurements in succession, don’t need to push and hold the TEST key for each measurement.

1). Press and hold the TEST button, then press the LOCK key to

enter LOCK mode.

2). Connect the probes to the desired test location in succession.

3). Press LOCK or TEST to disable the lock function.

4). The meter cannot indicate if the circuit is live in this mode. Ensure that the circuit is deenergized before connecting the test probes or the fuse may blow.

8. MΩ INSULATION RESISTANCE MEASUREMENTS

8-1 Measuring Insulation Resistance

Measuring insulation resistance requires the application of potentially dangerous voltages to the circuit. This may include exposed metal surfaces.

Before proceeding, ensure that the installation is correctly wired and no personnel are endangered by any test.

1). Set the function switch to the desired MΩ test voltage position.

2). Connect the red test lead to “VΩ” jack and black test lead to “COM” jack.

3). Connect the probes to the circuit to be measured, if there is a

voltage measured by the probes, the voltage will be displayed.

A repetitive beep and the flashing high voltage symbol “ the LCD will be present to warn the user when the voltage is over 30V. Please remove the voltage from the circuit under test before preceding the next step.

4). The display will show “-----“ until the TEST button is pressed.

Press and hold the TEST key. The upper right display shows the test voltage applied to the circuit under test. The main display shows the resistance until a stable resistance reading is displayed on the main display.

5). After releasing the TEST key the upper right display shows the

measured resistance and the circuit discharges through the meter. The main display indicates the decreasing voltage. Assure the probes remain in contact with the circuit until it is completely discharged and “-----“ again appears on the main display. The upper right display holds the resistance reading until a new test is performed or a different function is selected.

8-2 Using the LOCK Function to Measure Insulation Resistance

For long duration tests use the LOCK mode. This eliminates the need to hold the TEST button for long periods.

1). Press and hold the TEST button, then press the LOCK key to

enter LOCK mode. In this mode, a potentially dangerous

voltage is continuously applied to the probes. In this mode, if the probes are disconnected from the circuit, the meter cannot discharge any potentially dangerous capacitive voltages left on the circuit.

In this mode the meter cannot indicate whether or not there is a

voltage present. Ensure that the circuit is de-energized before connecting the test probes.

2). Press the LOCK or TEST key again to disable the Lock mode.

” on

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9. POWER TOOLS AND SMALL APPLIANCES

This test would also apply to other similar equipment that has a power cord. For double insulated power tools, one lead of the megohmmeter must be connected to the housing. The other leads would be connected to some metal part of the tool (e.g. chuck, housing bolt).

Note: The power switch must be in the “ON” position and the main power

should be disconnected.

individually, leaving the other connected to the grounded motor housing. The above also applies to DC Generators.

MOTORS

Disconnect the motor from the line by disconnecting the wires at the motor terminals or by opening the main switch. If a main switch is used and the motor has a starter contactor then the starter contacts must be held closed by some means, possible by energizing the coil. In the latter case, the measured resistance will include the resistance of the motor, wire and all other components between the motor and the main switch. If a problem is indicated, the motor and other components should be checked individually. If the motor is disconnected at the motor terminals, connect one megohmmeter lead to the grounded motor housing and the other lead to hot motor lead.

Disconnect the motor from the line. To test the brush rigging, field coils and armature connect one megohmmeter lead to the grounded motor housing and the other lead to the brush on the commutator. If the resistance measurement indicates a problem, raise the brushes off the commutator and separately test the armature, field coils and brush rigging by connecting one megohmmeter lead to each of them

CABLES

Disconnect the cable from power. Also, disconnect the opposite end of the cable to avoid any leakage due to the load. Check each conductor to ground and/or lead source by connecting one megohmmeter lead to ground and/or lead source and the other megohmmeter lead to each of the conductors. Check insulation resistance between conductors by connecting megohmmeter leads to conductors in pairs.

10. FUSE CHECK & REPLACEMENT

10-1 Testing the Fuse

1). Set the function switch to LoΩ position.

2). Connect the test leads to the input terminals and short then together.

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3). Press TEST key, the display should indicate approximately 0.5Ω, if the

display reads OL, replace the fuse as described next and test again.

10-2 Replace the Fuse

Warning

To avoid electric shock, personal injury or damage to the meter, use only the specified fuse.

1). Set the function switch to OFF position.

2). Disconnect test leads from any power source.

3). Place the meter face down on a nonabrasive surface and loosen the four screws.

4). Take off the bottom cover.

5). Remove the fuse, replace with a new fuse.

6). Place the bottom cover on and secure the four screws.

7). Test the fuse (refer 10-1 Testing the Fuse).

11. BATTERY REPLACEMENT

1). Set the function switch to OFF position.

2). Disconnect test leads from any power source.

3). Place the meter face down on a nonabrasive surface and loosen the two screws.

4). Take off the battery cover.

5). Remove the battery, replace with six new batteries.

6). Place the battery cover on and secure the two screws.

12. MAINTENANCE & CLEANING

Maintenance & Clearing :

1). Repairs or servicing not covered in this manual should only be

performed by qualified personnel.

2). Periodically wipe the case with a dry cloth.

Do not use abrasives or solvents on this instrument.

WARRANTY

Congratulations! Your new instrument has been quality crafted according to quality standards and contains quality components and workmanship. It has been inspected for proper operation of all of its functions and tested by qualified factory technicians according to the long-established standards of our company.

Your instrument has a limited warranty against defective materials and/or workmanship for one year from the date of purchase provided that, in the opinion of the factory, the instrument has not been tampered with or taken apart.

Should your instrument fail due to defective materials, and/or workmanship during this one-year period, a no charge repair or replacement will be made to the original purchaser. Please have your dated bill of sale, which must identify the instrument model number and serial number and call the number listed below:

Repair Department ATP – Amprobe, TIF, Promax Miramar, FL Phone: 954-499-5400

800-327-5060

Fax: 954-499-5454 Website: www.Amprobe.com

Please obtain an RMA number before returning product for repair.

Outside the U.S.A. the local representative will assist you. Above limited warranty covers repair and replacement of instrument only and no other obligation is stated or implied.

Miramar, FL

Phone: 954-499-5400

Fax: 954-499-5454

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www.Amprobe.com

Sep-2003