Tekpower Model: TP8268
Auto Ranging Multimeter
User’s Manual
Table of Contents
TITLE
1. GENERAL INSTRUCTIONS
1.1 Safety Cautions
1.1.1 Tips Before Measurement
1.1.2 Symbols:
1.1.3 Before start to use the multimeter
1.2 Protection Design
2. DESCRIPTION
2.1 Instrument Part Names
2.2 LCD Display
2.3 Key pad
2.4 Terminals
2.5 Accessories
3. FUNCTION DESCRIPTION
3.1 General Functions
3.1.1 DATA HOLD mode
3.1.2 Battery saver
3.1.3 Non Contact AC Voltage detection
3.2 Measurement Functions
3.2.1 AC and DC Voltage measurement
3.2.2 Resistance measurement
3.2.3 Diode Test
3.2.4 Continuity Check
PAGE
UM — —
0 O ON UP R
Table of Contents
TITLE
3.2.5 Capacitance measurement
3.2.6 Transistor measurement
3.2.7 Frequency measurement
3.2.8 Current measurement
4. TECHNICAL SPECIFICATIONS
4.1 General specifications..
4.2 Measurement specifications
4.2.1 DC Voltage
4.2.2 AC Voltage
4.2.3 Frequency
4.2.4 Resistance
4.2.5 Diode Test
4.2.6 Audible continuity
4.2.7 Transistor
4.2.8 Capacitance
4.2.9 DC Current
4.2.10 AC Current
5. MAINTENANCE
5.1 General maintenance
5.2 Battery replacement
IT
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1. GENERAL INSTRUCTIONS
Tekpower TP8268 is an auto ranging full feature multimeter with Voltage, Current,
Resistance ,Capacitance, Frequency, Duty Cycle, None Contact Voltage Detect,
Diode , Transistor with LCD Backlight.
This multimeter complies with IEC 61010-1, CAT. III 1000V and CAT.IV 600V
overvoltage standards. For details, see the specifications.
To get the best from this instrument, read this user's manual carefully and pay
attention to the detailed safety precautions.
The symbols used on the Meter and in this manual are explained in chapter 1.1.2
1.1 Safety Cautions
1.1.1 Tips Before Measurement
*If the meter is used near electromagnetic noise generating equipment, the display
may become unstable or indicates larger errors than normal.
*Do not use the meter or test leads if they look damaged.
*Use the meter only as specified in this manual, otherwise, the protection
provided by the meter may be impaired.
* Use extreme caution when working around bare conductors or bus bars.
* Do not operate the meter around explosive gas, vapor, or dust.
* Verify a Meter's operation by measuring a known voltage. Do not use the Meter
if it operates abnormally. Protection may be impaired. When in doubt, have
the Meter serviced.
* Uses the proper terminals, function, and range for your measurements.
* When the range of the value to be measured is unknown, check that the range
initially, set the multimeter to the highest possible or, wherever possible,
choose the auto-ranging mode.
* To avoid damages to the multimeter, do not exceed the maximum limits of the
input values shown in the technical specification tables.
* When the multimeter connects to a circuits, do not touch unused terminals.
* Caution: when working with voltages above 60Vdc or 30Vac RMS, be more
careful, these voltages produce a shock danger.
* When using the probes, keep your fingers behind the finger guards.
* When making connections, connect the common test lead before connecting the
live test lead; when disconnecting, disconnect the live test lead before
disconnecting the common test lead.
* Before changing functions, disconnect the test leads from the circuit under test.
1
* For all DC functions, including manual or auto-ranging, to avoid the risk of
shock due to possible improper reading, verify the presence of any AC
voltages by first set to AC function. Then select a AC voltage range equal to or
greater than the ac range.
* Disconnect circuit power and discharge all high-voltage capacitors before testing
resistance, continuity, diodes, or capacitance.
* Never perform resistance or continuity measurements on live circuit.
* Before measuring current, check the fuse and turn off power to the circuit before
connecting the meter to the circuit.
* In TV repair work, or when carrying out measurements on power switching circuits,
remember that high amplitude voltage pulses at the test points can damage the
multimeter. Use of a TV filter will attenuate any such pulses.
* Use the 9V NEDA battery, properly installed in the Meter's battery case, to
power the Meter, check battery volt, low voltage may result in low accuracy.
* Replace the battery as soon as the battery indicator ( ) appears. With a
low battery, the Meter might produce false readings that can lead to electric
shock and personal injury.
* Do not measure voltages above 600V in Category IV, or 1000V in Category III
installations.
* Do not operate the Meter with the case (or part of the case) removed.
1.1.2 Symbols:
Symbols used in this manual and on the instrument:
Caution: refer to the instruction manual. Incorrect use may
result in damage to the device or its components.
AC (Alternating Current)
1 >
DC (Direct Current)
Earth ground
Double insulated
| а +
Fuse
M
m
Conforms to European Union directives
1.1.3 Before start to use the multimeter
* Remove test leads from the Meter before opening the Meter case or battery
cover.
* When repair the Meter, use only specified replacement parts.
* Before turn on the multimeter, always disconnect from all sources of electric
current and make sure you are not charged with static electricity, which may
destroy internal components.
* Any adjustment, maintenance or repair work carried out on the meter should be
carried out only by appropriately qualified personnel, who knows this meter
well.
* After the multimeter is turned on, remember that some internal capacitors can
retain a dangerous potential the moment after the instrument is turned off.
* If any faults or abnormal display are observed, disconnect the multimeter from
Device Under Test, and check it before use.
* If the multimeter is not going to be used for a long time, take out the battery and
do not store the meter in high temperature or high humidity environment.
1.2 Protection Design
* Fused by the fuse (FF400mA/250V) during temperature, mA and hFE
measurements.
* A PTC resistor protects against permanent over-voltage of up to 250V during
resistance, Frequency, continuity and diode test measurements.
2. DESCRIPTION
2.1 Instrument Part Names
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1.Voltage alert area (NCV) 2.Voltage alert light 3. LCD display 4. Keypad 5.
Rotary switch 6. Terminals
2.2 LCD Display
See Table 1 indicated for information about the LCD display.
7
4
PH 0) Ш RELhE X
0000:
«0.0.0.0
A Vem y Vans y Vans? y Van "TEA
N J
Figure 1.Display
Table 1. Display Symbols
Symbol Meaning
The battery is low.
Warning: To avoid false readings, which
could lead to possible electric shock or personal
injury, replace the battery as soon as the battery
indicator appears.
= Indicates negative readings.
Indicator for ac voltage or current.
AC voltage and current are displayed as the
AC average of the absolute value of the input,
calibrated to indicate the equivalent rms value of
a sine wave.
DC Indicator for dc voltage or current.
»t The Meter is in the Diode Test mode
Mi ©) | Auto ranges and auto power off
on) The Meter is in the Continuity Check mode.
H The Meter is in the Data Hold mode
Table 1. Display Symbols (continued)
V: Volts. The unit of voltage.
Y, mV Lo 3
mV: Millivolt. 1x10” or 0.001 volts.
A: Amperes (amps). The unit of current.
A, mA, pA | mA: Milliamp. 1x10* or 0.001 amperes.
HA: Microamp. 1x10° or 0.000001 amperes
Q: Ohm. The unit of resistance.
©, КО, МО | КО: — Kilohm. 1x10 or 1000 ohms.
MO: Megohm. 1x10° or 1,000,000 ohms.
Hz: Hertz, the unit of frequency
MkHz |KHz: Kilohertz. 1x10° or 1000 hertz.
MHz Milohertz, 1 x10° or1000000 hertz
F: Farad. The unit of capacitance.
pF, nF uF: — Microfarad.Ix10% or 0.000001 farads.
nF: — Nanofarad. 1x10” or 0.000000001 farads.
2.3 Keypad
See Table 2 indicated for information about the keypad operations.
Table 2. Keypad
FUNC
“FUNC” key is the function select key that acts with
trigger. Use the key as switch of DC/AC,
Resistance/Continuity/Diode/capacitance ,Hold this Key
when turn on the meter, it disables the auto-power off
function.
Press “HOLD” to enter and exit the hold mode in any
mode. That act with trigger.
Press “ ” to enter and exit the meter back light mode.
RANGE
The range selection. The default set is auto measurement
when power is turned on. Press once time, it will switch to
manual mode and „AUTO“ sign is displayed on the LCD. If
press it again, the meter will jump to the lowest range, and
change range in an order from low to high for each press. If
press and hold this key over 2sec, the meter will switch to
Auto mode and ,AUTO“sign will be displayed on the LCD.
Press the “REL” key, you can measure the relative value
and , REL ‘sign will appear on the LCD display in the
relative mode.
What is meant by relative value? Press the “REL” key, the
meter make the first measured value into a reference value
(You must decide a reference value as the input signal.) ,
and the meter store the displayed reading as a reference
value.
The relative measured value that displayed in LCD is
achieved by subtracting a reference value from the
present reading value.
Vx - Vref=Vdisplay
Hz/
Duty
This key acts with trigger.. Press “Hz/Duty “key when
frequency mode is in operation, the meter will switch to
duty cycle measurement mode. Press this key again to
switch to frequency measurement mode also.
2.4 Terminals
See Table 4 indicated for information about the terminals.
Table 4. Terminals
Terminal Description
Return terminal for all measurements. (Receiving the
COM black test lead or the “com” plug of the special
multi-function socket)
»t+vo
Hz% db
Input for voltage, resistance, capacitor, frequency, diode
and continuity measurements. (Receiving the red test lead).
pA.mMA
Input for hFE and 0.01pA to 400mA current measurements.
(Receiving the red test lead or the “+” plug of the special
hFE ‚ ;
multi-function socket)
10A Input for 400mA to 10A current measurements. (Receiving
the red test lead)
2.5 Accessories
Delivered with the multimeter:
e User's manual One piece
e Test leads One piece
e Special Multi-function socket One piece
3. FUNCTION DESCRIPTION
3.1 General Functions
3.1.1 DATA HOLD mode
Data Hold mode stops updating the display. Data Hold function can be
cancelled by changing the measurement mode, or push HOLD key again.
To enter and exit the Data Hold mode:
1. Press HOLD key. Hold the display on the current value, H is
displayed.
2. A second short press returns the meter to normal mode.
3.1.2 Battery Saver
After Turn on the meter, the Meter will be turned off automatic after approx.
15 minutes, the buzzer will sound five times before the Meter turns off .To
disable the auto-power-off, turn off the meter, hold the FUNC key to turn on
the meter, the auto power off will be disabled. The default set for the meter is
Auto-Power—Off when the meter is turned on. Each time when it is turned on,
the meter is in auto power off mode
3.1.3 Non Contact AC Voltage detection
Set rotary switch to the NOV position and hold the Meters top towards a
live conductor, when the live voltage > 110V(RMS),the sensing
indicator will be on and the buzzer will keep sounding as warning.
Note:
1: Even without LED indication, the voltage may still exist. Do not rely on
non-contact voltage detector to determine the presence of voltage wire,
Detection operation may be subject to socket design, insulation thickness and
different type and other factors
2:When the meter input terminals presence voltage, due to the influence of
presence voltage, voltage sensing indicator may also be on.
3: Keep the meter away from electrical noise sources during the tests, such as
florescent lights, dimmable lights, motors, etc.. These sources can trigger
NON-Contact AC Voltage Detection Function and influences the test.
3.2 Measurement Functions
3.2.1 AC and DC Voltage measurement
A To avoid electrical shock and/or damage to the instrument, do not
attempt to take any voltage measurement that might exceeds
1000Vdc or 750Vac rms.
To avoid electrical shock and/or damage to the instrument, do not
apply more than 1000Vdc or 750Vac rms between the common
terminal and the earth ground.
Voltage is the difference in electrical potential between two points.
The polarity of AC (alternating current) voltage varies over time; the polarity of
DC (direct current) voltage is constant.
The Meter's DC voltage ranges are 400.0mV, 4.000V, 40.00V, 400.0V and
1000V; AC voltage ranges are 400.0mV (only in range mode), 4.000V, 40.00V,
400.0V and 750V.
To measure ac or dc voltage:
1. Set rotary switch to the => V position.
2. Connect the black test leader and red test leader to the COM and V
terminals respectively.
3. Connect the test leader to the circuit being measured
4. Read the displayed value. The polarity of red test lead connection will be
indicated when making a DCV measurement.
NOTE:
® Unstable display may occur especially at DC400mV and AC400mV ranges,
even though you do not put test leads into input terminals, in this case, if an
erroneous reading is suspected, short the V terminal and the COM terminal,
and make sure the zero display.
3.2.2 Resistance measurement
A To avoid electrical shock and/or damage to the instrument,
disconnect circuit power and discharge all high-voltage
capacitors before measuring resistance.
Resistance is an opposition to current flow.
The Meter's resistance ranges are 400.00, 4.000kQ, 40.00kQ, 400.0kQ,
4.000MQ and 40.00MOQ.
10
To measure resistance: an
1. Set the rotary switch to »Q position.
2. Connect the black and red test leads to the COM and Q terminals
respectively.
3. Connect the test leads to the circuit being measured and read the displayed value.
Some tips for measuring resistance:
e The measured value of a resistor in a circuit is often different from the
resistor's rated value. This is because the Meter's test current flows through all
possible paths between the probe tips.
e In order to ensure the best accuracy in measurement of low resistance, short the
test leads before measurement and memorize the test probe resistance in mind.
Then subtract for the resistance of the test leads from the reading, you get a better
accuracy reading of the resistance. Or you may use relative function to do so.
® On 40MQ range, the meter may take a few seconds to stabilize reading. This is
normal for high resistance measuring.
e When the input is not connected, i.e. at open circuit, the figure "OL" will be
displayed for the over-range condition.
3.2.3 Diode Test
To avoid electrical shock and/or damage to the
instrument, disconnect circuit power and discharge all
high-voltage capacitors before testing diodes.
Use the diode test to check diodes, and other semi- conductor
devices. The diode test sends a current through the semiconductor
junction, and then measures the voltage drop across the junction; a good
silicon junction volt drops between 0.5V and 0.8V.
To test a diode out of a circuit:
1. Set the rotary switch to we position.
2. Press the FUNC key one time to activate Diode Test.
3. Connect the black and red test leads to the COM and Pt terminals
respectively.
4. For forward-bias readings on any semiconductor component, place the red
test lead on the component's anode and place the black test lead on the
component's cathode.
5. The meter will show the approx. forward voltage of the diode. If the test
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lead connection is reversed, only figure "OL" displayed.
In a circuit, a good diode should still produce a forward bias reading of 0.5V to
0.8V; however, the reverse-bias reading can vary depending on the resistance of
other pathways between the probe tips.
3.2.4 Continuity Check
A To avoid electrical shock and/or damage to the instrument,
disconnect circuit power and discharge all high-voltage
capacitors before testing for Continuity.
Continuity is a complete through path for current flow.
The beeper sounds if a circuit is complete. These brief contacts cause the Meter
to emit a short beep.
To test for continuity: 4
1. Set the rotary switch to © position.
2. Press the FUNC key twice to activate Continuity Check.
3. Connect the black and red test leads to the COM and terminals
respectively.
4. Connect the test leads to the resistance in the circuit being measured.
5. When the test lead to the circuit is below approx. 60€2, a continuous
beeping will indicate it.
Note:
¢ Continuity test is available to check open/short of the circuit.
3.2.5 Capacitance measurement
A To avoid electrical shock and/or damage to the instrument,
disconnect circuit power and discharge all high-voltage
capacitors before measuring capacitance. Use the dc voltage
function to confirm that the capacitor is discharged.
Capacitance is the ability of a component to store an electrical charge.
The unit of capacitance is the farad (F). Most capacitors are in the nanofarad to
microfarad range. The Meter's capacitance ranges are 4.000nF, 40.00nF, 400.0nF,
4.000uF ,40.0uF and 200.0pF.
To measure capacitance:
1. Set the rotary switch to we position. Press the FUNC key Three Times to
activate Capacitance Test.
2. Connect the black and red test leads to the COM and Ak terminals
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respectively (or you can measure the capacitance by using the special
Multi-Function Socket).
3. Connect the test leads to the capacitor being measured and read the displayed value.
Some tips for measuring capacitance:
e The meter may take a few seconds to stabilize reading. This is normal for high
capacitance measuring.
e To improve the accuracy of measurements less than 40nF, subtract the residual
capacitance of the Meter and leads.
3.2.6 Transistor measurement
A To avoid electrical shock and/or damage to the instrument, do
not apply more than 250Vdc or 250Vac rms between the hFE
terminal and the COM terminal.
1. Set the rotary switch to hFE position.
2. Connect the “com” plug and “+” plug of the special multi-function socket to the
COM and hFE terminals.
3. Determine whether the transistor to be tested is NPN or PNP type and locate the
Emitter, Base and Collector leads.
4. Insert leads of the transistor into proper holes of the special multi-function
socket.
5. The meter will show the approx. hFE value at test condition of base current
10pA and Vee 2.8V.
3.2.7 Frequency measurement
A Do not measure Frequency on high voltage (>250V) to avoid
electrical shock hazard and/or damage to the instrument.
Frequency is the number of cycles a voltage or current signal completes each
second.
To measure frequency:
1. Set the rotary switch to Hz % position.
2. Connect the black and red test leads to the COM and Hz terminals
respectively.
3. Connect the test leads to the circuit being measured
4, Read the displayed value.
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3.2.8 Current measurement
AT avoid damage to the Meter or injury if the fuse blows, never attempt
an in-circuit current measurement where the open-circuit potential to
earth is greater than 250
To avoid damage to the meter, check the meter's fuse before
proceeding. Use the proper terminals, function, and range for
your measurement. Never place the test leads in parallel with a
circuit or component when the leads are plugged into the current
terminals.
Current is the flow of electrons through a conductor. The Meter's DC current
ranges are 400.0pA, 4000pA 40.00mA, 400.0mA,4.000A and 10.00A; AC
current ranges are 400.0uA, 4mA ,40.00mA, 400.0mA,4.000A and 10.00A.
To measure current:
1. Turn off the power of the measured circuit. Discharge all the high voltage
capacitors.
2. Set the rotary switch to the proper position.
3. Connect the black test lead to the COM terminal and the red test leads to the
mA terminal for a maximum of 400mA. For a maximum of 10A, move the
red test lead to the 10A terminal.
4. Break the circuit path to be tested.
Connect the black test leads to the more negative side of the break; connect
the red test leads to the more positive side of the break. (Reversing the leads
will give a negative reading, but will not damage the Meter.)
5. Turn on the power of the measured circuit, and then read the display. Be
sure to note the measurement units at the right side of the display (mA or
A). When only the figure "OL" displayed, it indicates overrange situation
and the higher range has to be selected.
6. Turn off the power of the measured circuit and discharge all the high voltage
capacitors. Remove the test leads and recover the measured circuit.
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4 TECHNICAL SPECIFICATIONS
4.1 GENERAL SPECIFICATIONS
e Environment conditions:
1000V CAT. III and 600V CAT. IV
Pollution degree: 2
Altitude < 2000m
Operating temperature:
0~40°C, 32°F ~122°F (<80% RH, <10°C noncondensing)
Storage temperature:
-10~60 °C, 14°F ~140°F (<70% RH, battery removed)
e Temperature Coefficient:
0.1x(specified accuracy) / 'C (<18°C or >28°C)
® МАХ. Voltage between terminals and earth ground:
750V AC rms or 1000V DC.
e Fuse Protection: mA: fuse (FF400mA/250V)
A:fuse (FF20A/250V)
e Sample Rate: 3 times/sec for digital data
e Display: 4000 counts with analog bar LCD display. Automatic indication of
functions and symbols.
e Over Range indication: LCD will display "OL".
e Low battery indication: The " +] " is displayed when the battery
is under the proper operation range.
® Polarity indication: "—" displayed automatically.
e Power source: 9V ===
e Battery type: NEDA 1604, 6F22, or 006P.
e Dimensions: 195(L)x92(W)x55(H) mm.
e Weight: 380g. Approx. (battery included).
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4.2 Measurement specifications
Accuracy is specified for one year after calibration, at operating temperatures of
18°C to 28°C, with relative humidity at 0% to 75%.
Accuracy specifications take the form of: +(% of Reading + Number of Least
Significant Digits)
4.2.1 DC Voltage
Range Resolution Accuracy
400mV 0.1mV
т Y +(0.5% of rdg +2 digit)
400V 100mV
1000V 1V +(0.8% of rdg +2 digits)
Input impedance: 10MQ
Max. input voltage: 1000Vdc or 750V ac rms.
4.2.2 AC Voltage
Range Resolution Accuracy
400mV 0.1mV +(2% of rdg +3 digits)
4V 1mV
40V 10mV +(0.8% of rdg +2digits)
400V 100mV
750V 1V +(1% of rdg +3 digits)
Input impedance: 10MQ
Max. input voltage: 1000Vdc or 750V ac rms.
Frequency Range: 40Hz-400Hz .
Response: Average, calibrated in RMS of sine wave
4.2.3 Frequency
Range Resolution Accuracy
9.999Hz 0.001Hz
99.99Hz 0.01Hz
999.9Hz 0.1Hz
9.999KHz 0.001 KHz + (0.5% of rdg+2 digits)
99.99KHz 0.01 KHz
999.9KHz 0.1 KHz
9.999MHz 0.001MHz
Overload protection: 250V dc or 250V ac rms.
Input Voltage range: 200mV-10V ac rms
4.2.4 Resistance
Range Resolution Accuracy
400Q 0.10 +(0.8% of rdg+3 digits)
4kQ 10
40k0 100 +(0.8% of rdg+1 digit)
400kQ2 100Q2
4MQ 1kQ
40MQ 10kQ +(1.0% of rdg+2 digits)
Overload protection: 250V dc or 250Vac rms.
Open Circuit Voltage: Less than 700mV.
4.2.5 Diode
Range Resolution Function
> mV ply read approx. forward voltage of
Forward DC Current: approx. 1mA
Reversed DC Voltage: approx. 2.8V
Overload protection: 250Vdc or 250Vac rms.
4.2.6 Audible continuity
Range
Continuity beeper
01)
<60Q2
Open circuit voltage: Less than 700mV.
Overload protection: 250Vdc or 250Vac rms.
4.2.7 Transistor
Range Description Test Condition
Display read approx. HFE | Base Current approx.
hFE value (0-1000) of transistor | 10uA, Vce approx. 2.8V.
under test (all type).
4.2.8 Capacitance
Range Resolution Accuracy
4nF 0.001nF
40nF 0.01nF
2000F 0.1nF + (4.0%rdg+15 digits)
4uF InF
40uF 10nF
200uF 100nF
Overload protection: 250V dc or 250V ac rms
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4.2.9 DC Current
Range Resolution Accuracy
400pA 0.1pA
mA nA +(0.8% of rdg+2 digits)
40mA 10pA
400mA 0.1mA
ЗА 0.0014 +(1.2% of rdg+2 digits)
20A 0.01A
Overload protection: fuse (FF400mA/250V).
10A range fuse(FF20A/250V)
Max. input current:400mA dc or 400mA ac rms for mA range, 20A dc or 20A ac
rms for 20A ranges.
For measurements>5A, the measuring time for high current(20A) should be <10
second for each measurement and the interval time between two measurement
should be greater than 1 minutes ; Above 20A unspecified.
4.2.10 AC Current
Range Resolution Accuracy
400pA 0.1pA
mA ША +(1.5% of rdg+2 digits)
40mA 10pA
400mA 0.1mA
ЗА 0.0014 +(2.0% of rdg+2 digits)
20A 0.01A
Overload protection: Resettable fuse (FF400mA/250V).
10A range fuse(FF20A/250V)
Max. input current: 400mA dc or 400mA ac rms for mA range, 20A dc or 20A ac
rms for 20A ranges.
For measurements>5SA, the measuring time for high current(20A) should be
<10 second for each measurement and the interval time between two
measurement should be greater than 1 minutes.; Above 20A unspecified.
Frequency Range: 40Hz-400Hz
Response: Average, calibrated in rms of sine wave
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5. MAINTENANCE
Do not attempt to repair or service your Meter unless you are qualified to do so
and have the relevant calibration, performance test, and service information.
5.1 General Maintenance
A To avoid electrical shock or damage to the meter, do not get water
inside the case. Remove the test leads and any input signals before
opening the case
Periodically wipe the case with a damp cloth and mild detergent. Do not use
abrasives or solvents.
Dirt or moisture in the terminals can affect readings.
To clean the terminals:
e Turn the meter off and remove all test leads.
e Shake out any dirt that may be in the terminals.
® Soak a new swab with a cleaning and oiling agent (such as WD-40).
® Work the swab around in each terminal. The oiling agent insulates the terminals
from moisture-related contamination.
5.2 Battery and Fuse replacement
NT avoid false readings, which could lead to possible electric shock
or personal injury, replace the battery as soon as the battery
indicator ( ) appears.
Use only fuses with the amperage,interrutp, voltage And speed
ratings specified
FF400mA/250V
FF20A/250V
Before replacing the battery, disconnect test leads and/or any
connectors from any circuit under test, turn the meter off and
remove test leads from the input terminals.
To replace the battery (see Figure 2.):
e Turn the meter off.
e Disconnect test leads and/or any connectors from the terminals.
e Use a screwdriver to unscrew the two screws secured on the battery cover.
e Take out the battery cover from the meter.
e Remove the used batteries.
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e Replace with the new 9V batteries (6F22).
® Rejoin the battery cover and secure by the two screws.
/N CAUTION
Using this appliance in an environment with a strong radiated
radio-frequency electromagnetic field (approx. 3V/m), may influence
its measuring accuracy. The measuring result can be strongly
deviating from the actual value.
Appendix
Category Definition
The International Electrotechnical Commission (IEC) has defined four voltage
category ratings, and an instrument's ability to withstand voltage spikes applied
through a specified level of resistance defines its category rating. The table below
lists the voltage category ratings.
Rated Voltage CAT IVCAT IIICAT II CAT I
150 V 4,000 V 2,500 V1,500 V800 V
300 V 6,000 V 4,000 V2,500 V1,500 V
600 V 8,000 V 6,000 V4,000 V2,500 V
1000 V 12,000 V 8,000 V6,000 V4,000 V
Resistance 2 ohms 2 ohms 12 ohms 30 hms
The resistance describes the source resistance of the testing apparatus, which
limits the current. Using Ohms law (I=V/R) the maximum current for a 300 V
CAT I test is 1500V / 30 ohms = 50A.
CAT I - Electronic
Protected electronic equipment
Equipment connected to (source) circuits in which measures are taken to limit
transient overvoltage to an appropriately low level
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Any high-voltage, low-energy source derived from a high winding-resistance
transformer, such as the high-votage section of a copier.
Low-voltage (< 1000 V) test equipment.
CAT II - Single-phase, receptacle-connected loads
Appliances, portable tools, and other similar light industrial/household loads
Outlet and long-branch circuits
Outlets at more than 30 ft from CAT III source
Outlets at more than 60 ft from CAT IV source.
CAT III - 3-phase distribution, including single-phase commercial lighting
Equipment in fixed installations, such as switchgear and polyphase motors
Bus and feeder in industrial plants
Feeders and short branch circuits, distribution panel devices
Appliance/equipment outlets with short connections to service entrance.
CAT IV - 3-phase at utility connection, outdoor conductors
Origin of installation, or where low-voltage connection is made to utility power
Electricity meters, primary overcurrent protection equipment
Outside and service entrance, service drop from pole to building, runs between
meter and panel
Overhead line to detached building, underground line to well pump.
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Y01-04-0093 AO
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