Mastech MS8236 User manual

MASTECH® M!iBi!36
NETWORK MULTIMETER§
OPERATION MANUAL
CE

MASTECH® MASTECH®
COI\IYEI\IY!i
1. Safety Information 1
1.1 Preliminary 1
1.2 Dos And Don'ts 2
1.3 Symbols 3
1.4 Precautions 3
2. Description 4
2.1 Names OF Parts 5
2.2 Switches, Buttons And Input Jacks 6
2.3 Display 7
3. Specifications 9
3.1 General 9
3.2 Technical Index 1 0
4. Operation Instruction 13
4.1 Function Switching 13
4.2 Range Switching 13
4.3 Maximum Value Measurement. 13
4.4 Reading Holding 13
4.5 Backlight Source 14
4.6 Use of the test key 14
4.7 Preparation For Measurement. 14
4.8 Measurement Of DC Voltage 15
4.9 Measurement Of AC Voltage 16
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4.10 Diode Test. 17
4.11 Circuit Continuity Test 17
4.12 Resistance Measurement. 18
4.13 Measurement Of DC Current 19
4.14 Measurement Of AC Current.. 20
4.15 Phone Line Mode Detection 21
4.16 Judgment And Tracking Of Cable Line 23
4.17 Network Cable Integrity Test.. 24
4.18 Non-Contact Voltage Detection 26
4.19 Operating Precautions Of
Protective Cover 27
4.20 Automatic Power Off 28
5. Maintenance 28
5.1 Replacement Of Batteries 28
5.2 Replacement Of Fuse 29
5.3 Replacement Of Test Probes 30
6. Accessories 31

MASTECH® MASTECH®
1. Safety Information 1.1.4 The test probes must be kept in good
condition.
Check whether the insulation of the test probes
&.WARNING
has been damaged and whether any wire has
BEEXTREMELY CAREFUL WHEN USINGTHE METER been exposed.
Improper useofthis device can result in electric shock 1.1.5 Using the
test probes supplied can ensure safety.
or destruction ofthe meter. Takeall normal safety
If required, they must be replaced with those of
precautions and follow the safeguards suggested inthis the same model or class
manual.
1.2 Dos and Don'ts
To exploit full functionality of the meter and ensure safe 1.2.1 Use the right input
jack, function and range.
operation, Protection provided bythe instrument will be
impaired if used in a manner not specified bythe 1.2.2 Do not take measurements beyond the
protection
manufacturer. limits indicated in the
specifications.
1.2.3 Do not touch the metal tips of the test probes when
The Auto Range Digital Multimeter (hereinafter referred connecting the meter to the
circuit to be measured.
to as" the meter") complies with the safety requirements
1.2.4 Keep your fingers behind the probe barriers when
for electronic measuring instruments in I EC-61 01 0-1, taking
a measurement with an effective voltage of
falls into pollution degree 2 and meets the over-voltage
above 60V DC or 30VAC.
standard of CAT III 600V. 1.2.5 Do not take any voltage measurement if the value
Follow all safety and operation instructions to ensure safe between the measuring
terminal and the ground
use of the meter. exceeds 1000V.
With proper use and care, the meter will give you years of 1.2.6 Select the highest range if the value to be
satisfactory service. measured in the manual range is unknown.
1.1 Preliminary
1.2.7 Do not connect the meter to any voltage source
while the meter is in the current, resistance, diode
1.1.1 Tooperate the meter, the user must observe the or
continuity test range.
following normal safety rules: 1.2.8
Disconnect the test probes from the circuit under
1) General protection against electric shock; and test before turning the range
selector to change
2) Protection of the meter against misuse
functions.
1.1.2 When the meter is received, please check whether
1.2.9 Be careful that high voltage pulses at the test point
it has been damaged during transport.
may damage the meter when measurements are
1.1.3 After being stored and delivered under harsh being taken on the switching power
circuit of a
conditions, the meter should be checked and TV set.
confirmed for damage. 1.2.10 Do not measure the resistance, diode or
continuity of live circuits.
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MASTECH® MASTECH®
1.2.11 Do not use the meter near explosive gases,
steam or dirt.
1.2.12 Stop using the meter if any abnormalities or
faults are noticed.
1.2.13 Do not use the meter unless its rear case is
securely fastened in its original position.
1.2.14 Do not store or use the meter in areas exposed
to direct sunlight, high temperatures or high
humidity.
1.3 Symbols
.& Important safety information; refer to the operation
manual.
&:. Dangerous voltage may be present.
IQI Double insulation (protection class II)
CAT 111- over-voltage (installation) category III, pollution
degree 2 per IEC61 01 0-1, referring tothe level ofimpulse
withstand voltage protection provided.
(E: Compliance with European Union (EU) directives
-=E- Ground
-S- Fuse
1.4 Precautions
1.4.1 Do not adjust or repair the meter by attempting to
remove the rear case. Such operation should only
be performed by a technician who fully understands
the meter and the electric shock risk involved.
1.4.2 Remove the test probes from the circuit under test
before opening the battery cover of the meter.
1.4.3 To avoid any electric shock caused by erroneous
readings, replace the batteries immediately when
03
the"~" symbol appears on the LCD.
1.4.4 To avoid fire hazards, the replacement fuse must
meet the specified voltage and current ratings of F
1 OA/500Vand F200mA/1 OOOV (quick acting).
1.4.5 Use wet cloth and mild detergent to clean the
meter; do not use abrasives or solvents.
1.4.6 Turn to OFF switch off the power when is not in use.
1.4.7 Remove the batteries to avoid damages to the
meter if it will idle for a long time.
1.4.8 Using this appliance in an environment with a
strong radiated radio-frequency electromagnetic
field (approximately 3V/m ),may influence its
measuring accuracy. The measuring resul can be
strongly deviating from the actual value.
2. Description
- The meter is a portable specialized measuring
instrument with a large digital LCD, as well as a
backlight sourcefor easy reading. The range selector
designedfor single-hand operation makes
measurement easy. Overload protection and low
battery indication are provided. It is an ideal
multi-functional instrument with scores of practical
applications for professional, factory, school, amateur
and home use.
- The meter can be used to measure DC andAC voltages
and currents, and resistances, test circuit continuity
and diodes, detect phone line mode, judge break points
in cable lines, track the routing of cable lines, and detect
network cable integrity and non-contact voltage.
- The meter is provided with both automatic/manual
ranges.
- The meter is provided with the automatic shutdown
function.
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MASTECH®
- The meter is provided with the reading hold function.
- The meter is provided with the maximum measurement
- The meter is provided with low battery voltage indication.
2.1 Names of Parts
05
MASTECH®
For reading holding
For maximum measurement
For switching between auto and
manual ranges
For switching among measuring functions
For switching on/off the backlight
For measurement
Input jack for 1 OA current range
For mA/µA current, voltage, resistance
and diode measurement
Common terminal
1 )Non-contact voltage detection indicator light
2)LCD (liquid crystal display)
3)Data hold (HOLD)
4)Maximum measurement (MAX)
5)Range switch button (RANGE)
6)Function switch button (FUNC)
7)Backlight key
8)Test key
9)Panel
10) Rotary selector
11 )mA/µAIV/O/jack
12) COM jack
13) 10Ajack
14) Guard plate
2.2 Switches, Buttons and Input Jacks
HOLD key
MAX key
RANGE key
FUNC key
Backlight key
TEST key
10Ajack
mA/µAIV/O/*
jack
COM jack
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MASTECH® MASTECH®
2.3 Display
V Volts (Voltage)
- AC (alternating current) A Amperes
(Current)
:":"': DC (direct current)
Hz Hertz
(Frequency)
AUTO Auto range
µ,m,k, M Symbols of units: micro, milli, kilo and million
n
Ohms (Resistance)
01')
Continuity buzzer
+I-
Diode measurement
«'1')) LAN PHONE .&" .... 01') Cl MAX EB
MAX Maximum measurement
ob _, ,~, n ,-,
H
Reading being held
". :-:-: kMQ
~
Low battery
f)~ - - -kHz
~ , I J I J I J mµVA
B
Phone standby
~ ._.-.-
,~
Phone ringing
laIDllalllDlmllllDllallDl ... .J
Phone pick-up
"' ____ III!IIll'.IJB_
IRED . RING I The RING line is clamped by the red clip
IRED· TIPI
The TIP line is clamped by the red clip
LCD diagram
("1" 1 Audio signal
<D-@
Cable pair 1-2
@-@
Cable pair 3-6
@-@
Cable pair 4-5
Q)-@
Cable pair 7-8
SHIELD Cable shield
OPEN Open
circuit
SHORT Short circuit
REVERSED Reverse connection
MISWIRE Miswiring
SPLIT PAIRS Split pair
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MASTECH® MASTECH®
3. Specifications
3.1 General
3.1.1 Auto range and manual range options are available.
3.1.2 Overload protection is available for all ranges.
3.1.3 Display: LCD.
3.1.4 Maximum value display: 1999 digits.
3.1.5 Polarity indication: automatic; '---' for negative
polarity.
3.1.6 Over-range indication: 'OL'or '---OL'.
3.1.7 Unit indication: function and energy unit indication.
3.1.8 Judging the ringing, standby or pick-up mode of
the phone line.
3.1.9 Judging any breakpoint in the cable line, and
tracking the routing of the cable line.
3.1.10 Detecting network cable integrity, judging open
circuit, short circuit, miswiring, split pair and
reverse connection of the network cable, and
shield integrity, and displaying abnormity
symbols.
3.1.11 Non-contact voltage detection.
3.1.12 Automatic power off time: 15 min
3.1.13 Fuse specification: F1 OA/500V,F200mA/1 OOOV
(quick acting)
3.1.14 Battery under-voltage indication: The LCD
displays the"~" symbol.
3.1.15 Operating power: 6F22 9V batteries
3.1.160perating temperature: 0°C-40°C
3.1.17Storage temperature:-1 0°C-50°C
3.1.18Dimensions: 195x92x55mm
3.1.19Weight:about 400g(including batteries)
09
3.2 Technical Index
3.2.1 DC Voltage
Range Resolution Accuracy
200mV 0.1mV
2V 1mV
: ± (O.5%ofreading+5digits)
20V 0.01V
200V 0.1V
1000V 1V
I ± (O.8%ofreading+5digits)
-Max. input voltage: 1 OOOV DC
Note:
At the low voltage range, unsteady readings will appear
before the test probes contact the circuit. This is normal
because the meter is highly sensitive. When the test
probes contact the circuit, the true reading will
be displayed.
3.2.2 AC Voltage
Range Resolution Accuracy
200mV 0.1mV
2V 1mV
± (O.8%ofreading+5digits)
20V 0.01V
200V 10.1V
750V 11V
- Max. input voltage: 750V AC
-Frequencyrange:40-400Hz
- Response: average (rms of sine wave)
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MASTECH® MASTECH®
Note:
At the low voltage range, unsteady readings will appear
before the test probes contact the circuit. This is normal
because the meter is highly sensitive. When the test
probes contact the circuit, the true reading will
be displayed.
3.2.3 Resistance
Range
Resolution Accuracy
2000 0.10
2KO 0.001 KO
20KO 0.01 KO ±(1.0%of reading+5digits)
200KO 0.1KO
2MO 0.001 MO
20MO 0.01MO
3.2.4 Diode Test
3.2.5 Short-Circuit Test
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3.2.6 DC Current
Ran e
Resolution Accuracy
200µA 0.1µA
2000µA 1µA ±(1.2%of reading
+ 5digits)
20mA 0.01mA
200mA 0.1mA
2A 0.001A
± (2.0%of reading + 5 digits)
20A 0.01A
- Overload protection:
µA, mA range: fuse 200mA/1 OOOV (quick acting)
1 OA range: fuse 1 OA/500V (quick acting)
- Max. input current: µA/mA jack (µA range): 2000uA
µA/mA jack (mA range): 200mA
1 OA jack: 10A
3.2.7 AC Current
Range
Resolution Accuracy
200µA 0.1µA
2000µA 1µA ±(1.5%of reading
+ 5digits)
20mA 0.01 mA
200mA 0.1mA
2A 0.001A
± (3.0%of reading+5 digits)
20A 0.01A
- Overload protection:
µA, mA range: fuse 200mA/1 OOOV (quick acting)
1 OA range: fuse 1 OA/500V (quick acting)
- Max. input current: µA/mA jack (µA range): 2000uA
µA/mAjack (mA range): 200mA
1 OA jack: 10A
-Frequencyrange:40-400Hz
- Response: average (rms of sine wave)

MASTECH® MASTECH®
4. Operating Instructions
4.5 Backlight Source
4.1 Function Switching
1) If the environment is too dark for reading during
1) Press the "FUNC" key to switch between AC and DC measurement, hold on to
the" ® " key for more than
2 seconds to turn on the backlight source.
measurement at the current ranges. 2) Hold on to
the" ® " key again for more than
2) Press the "FUNC" key to switch between the diode
2 seconds to turn off the backlight source.
and continuity ranges. 3)
After the backlight source is turned on, if the" ® "
4.2 Range Switching
key is not held down for more than 2 seconds, the
1)When the meter is turned on, it is at the auto range for backlight
source will shut down automatically 15
measuring current, voltage and resistance.
seconds later.
2) Press the "RANGE" key to enter the manual range
4.6 Use of the Test Key
mode. The range will go one level up with each press 1) Press "TEST" to
start detection when the meter is at
and return to the lowest level when the highest level the Phone (phone line mode
detection), Tone
is reached.
(judgment and tracking of cable line), Net Cable
3) Hold the "RANGE" key for more than 2 seconds to (network cable
integrity detection) range.
return to the auto range. 2)
After the detection, the detection result indicator will
4.3 Maximum Value Measurement
flash. Press the "TEST" key to stop flashing and get
1)The maximum value measurement function can be ready
for the next detection.
used when the meter is measuring current and voltage.
4.7 Preparation for Measurement
2) To display the measured maximum value during 1)Turn the range
selector and turn on the power. If the
measurement, press the "MAX" key, and the
measured maximum value will appear on the LCD. battery
voltage is low (about ~7.2V), the LCD will
3) Press the "MAX" key again to release the maximum
display the "~" symbol, when the batteries must
value measurement function.
be replaced.
4.4 Reading Holding
2) The "&." symbol beside the input line indicates that
the input voltage or current should not exceed the
1)Tohold the reading during measurement, press the indicated value. This is intended to protect the
"HOLD" key, and the displayed value on the LCD internal
circuit from damage.
will be locked. 3) Set the range
selector to the desired measurement
2) Press the "HOLD" key again to release the reading
function and range. In the manual range mode, if the
holding mode. scale of the measured value is unknown beforehand,
the highest range should be set.
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MASTECH® MASTECH®
4) Connect the common test wire and then the live test
wire during connection. Remove the live test wire
first during disconnection.
4.8 Measurement of DC Voltage
&. WARNING
There is the risk of electric shock.
Pay special attention to avoid electric shock when
measuring high voltages.
Do not input any voltage of over DC1 OOOV, which may
damage the internal circuit thougha higher voltage
may be displayed.
4.8.1 Plug the black probe into the COM jack and the red
probe into the Vjack.
4.8.2 Set the range selector to tne e V range position.
4.8.3 Press the "FUNC" key to switch to the DC
measurement mode, and press the "RANGE" key
to select the auto or manual mode.
4.8.4 Connect the test probes to the voltage source or
load in parallel for measurement.
4.8.5 Take a reading in the main display area of the LCD.
The polarity indication will show the polarity of the
terminal connected by the red probe.
Note:
1)At the low voltage range, unsteady readings will appear
before the test probes contact the circuit. This is normal
because the meter is highly sensitive. When the test
probes contact the circuit, the true reading will be
displayed.
2) In the manual range mode, if the LCD displays "0 L"
or "-0 L" only, it means the measurement has exceeded
the range and a higher range should be selected.
15
3) In the manual range mode, if the scale of the measured
value is unknown beforehand, the highest range should
be set and then lowered down gradually.
4.9 Measurement of AC Voltage
&.WARNING
There is the risk of electric shock.
Pay special attention to avoid electric shock when
measuring high voltages.
Do not input any voltage of over AC750V rms,which
may damage the internal circuit thougha higher
voltage may be displayed.
4.9.1 Plug the black probe into the COM jack and the red
probe into the Vjack.
4.9.2 Set the range selector to the ::;:;V range position.
4.9.3 Press the "RANGE" key to select the auto or manual
mode.
4.9.4 Connect the test probes to the voltage source or load
in parallel for measurement.
4.9.5 Take a reading in the main display area of the LCD.
Note:
1) At the low voltage range, unsteady readings will appear
before the test probes contact the circuit. This is normal
because the meter is highly sensitive. When the test
probes contact the circuit, the true reading will be
displayed.
2) In the manual range mode, if the LCD displays '0 L' only,
it means the measurement has exceeded the range and
a higher range should be selected.
3) In the manual range mode, if the scale of the measured
value is unknown beforehand, the highest range should
be set and then lowered down gradually.
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MASTECH® MASTECH®
4.10 Diode Test
4.10.1 Plug the black probe into the COM jack andthe
red probe into the. jack.
4.10.2 Set the range selector to the 01))* range position.
4.10.3 Pressthe "FUNC" keyto switch to the. test
mode.
4.10.4 Connect the red probe to the anode and the black
probe to the cathode of the diode for testing.
4.10.5 Take a reading in the main display area of the LCD.
Note:
1)The meter indicates the approximate forward voltage
drop of the diode.
2) Ifthe test probes are reversed or open, the LCDwill
display 'OL'.
4.11 Circuit Continuity Test
&. WARNING
There is the risk of electric shock.
When measuring the continuity of a circuit,make sure
the power is disconnected and thecapacitor on the
circuit is fully discharged.
4.11.1 Plug the black probe into the COM jack and the
red probe into the 0 jack.
4.11.2 Set the range selector to the ol)).range position.
4.11.3 Press the "FUNC"key to switch to the 01') circuit
continuity test mode.
4.11.4 Connect the test probes to the circuit for
measurement.
4.11.5 Ifthe resistance of the circuit under test is less
than 700, the buzzer in the meter will beep.
4.11.6 Read the resistance of the circuit in the main
display area of the LCD.
Note:
Ifthe test probes are open or the resistance ofthe circuit
under test is over 2000, "OL" will be displayed on the LCD.
4.12 Resistance Measurement
&.WARNING
There is the risk of electric shock.
When measuring the impedance of a circuit, make
sure the power is disconnected and theapacitor on the
circuit is fully discharged.
4.12.1 Plug the black probe into the COM jack and the
red probe into the n jack.
4.12.2 Set the range selector to the 0 range position.
4.12.3 Press the"RANGE" key to select auto/manual
range.
4.12.4 Connect the test probes to the resistor or circuit
under test for measurement.
4.12.5Take a reading in the main display area of the LCD.
Note:
1) In the manual range mode, if the LCDdisplays '0 L'
only, it meansthe measurement has exceeded the
range and a higher range should be selected.
2) In case of open input, the LCDwill display the 'OL'
over-range mode.
3) Ifthe resistance to be measured is higher than 1 MO ,
the meter maytake a few seconds to get a steady
reading. This is normal for high resistance reading.
17
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MASTECH® MASTECH®
4.13 Measurement of DC Current 4.14 Measurement of AC Current
&.WARNING &.WARNING
There is the risk of electric shock. There is the risk of
electric shock.
Turn off the power of the circuit under test,then
Turn off the power of the circuit under test,and then
connect the meter to the circuit in series for
connect the meter to the circuit in series for
measurement. measurement.
4.13.1 Plug the black probe into the COM jack. When the 4.14.1 Plug the black probe into the COM jack. When the
current to be measured is below 200mA, plug the current to be measured is below 200mA, plug the
red probe into the uA/mA jack; when the current red probe into the uA/mAjack; when the current to
to be measured is over 200mA but below 10A, be measured is over 200mA but below 10A, plug
plug the red probe into the 10Ajack. the red probe into the 10Ajack.
4.13.2 Set the range selector to the desired ~ current 4.14.2 Set the range selector to the desired
je current
range position. range position.
4.13.3 Press the "FUNC" key to switch to DC 4.14.3 Press the "FUNC" key to switch to the DC
measurement mode, and press the "RANGE" key measurement mode, and press the "RANGE" key
to select the auto or manual mode. to select the auto or manual mode.
4.13.4 Connect the test probes to the circuit under test in 4.14.4 Connect the test probes to the circuit under test in
series for measurement. series for measurement.
4.13.5 Take a reading in the main display area of the LCD. 4.14.5Take
a reading in the main display area of the LCD.
The polarity indication will show the polarity of the
terminal connected by the red probe. Note:
Note:
1) In the manual range mode, if the LCD displays '0 L'
1) In the manual range mode, if the LCD displays '0 L'
only, it means the measurement has exceeded the
range and a higher range should be selected.
only, it means the measurement has exceeded the 2)
In the manual range mode, if the scale of the measured
range and a higher range should be selected. value is unknown beforehand, the highest range
2) In the manual range mode, if the scale of the measured should be set.
value is unknown beforehand, the highest range should 3)
".&" means the maximum input current of the mAjack
be set.
3) "&''' means the maximum input current of the mAjack
is 200mA and that of the 1 OAjack is 1 OA. At the 10Ajack,
is 200mA and that of the 1 OA jack is 1 ~A. At the 10Ajack, excess current will blow the fuse.
excess current will blow the fuse.
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19 i!0

MASTECH® MASTECH®
4.15 Phone Line Mode Detection
4.15.1 Plug the attached detection line into the jack in
front of the meter and turn the rotary selector to
the Phone range.
4.15.2 Clamp the two wires of the phone line with the
two clips of the connecting line or plug the
modular plug into the phone socket. Press the
"TEST" key, and the "Phone" symbol will flash
and the phone line mode detection will begin.
4.15.3 The "Phone" symbol stops flashing and the
detection result is displayed. If the detection
result symbol flashes, the mode of the phone
line is as follows:
RED-TIP flashing The TIP line is clamped by
the red clip.
RED-RING flashing The RING line is clamped by
the red clip.
"
The phone line is in the
';A' flashing ringing mode.
~
The phone line is in the
... flashing standby mode.
a.) flashing The phone line is in the
pick-up mode.
i!1
RedConnectingLine
Connecting interface Cable interface
Note:
1. If the RED-TI P symbol flashes, the standby and pick-up
modes of the phone line cannot be judged. In this case,
be sure to clamp the RING line with the red clip and the
TIP line with the black clip.
2. If the line status changes, be sure to press "TEST" to
close the current test result and then press "TEST"
again to test the line status.
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MASTECH® MASTECH®
4.16 Judgment and Tracking of Cable Line
4.16.1 Plug the attached detection line into the jack in
front of the meter and turn the rotary selector to
the Tonerange.
4.16.2 Connect the outgoing wire of the connecting line to
the target cable pair or connect the red line to the
target cable and the black line to the ground.
4.16.3 Press the "TEST" key, and the" (II') " symbol will
flash to transmit an audio signal. Bring the antenna
of the receiver close to the target cable and hold
down the Receive key to receive the audio signal
transmitted, and then you canjudge the routing
and continuity of the cable. If there is any break
point on the cable, its position can bejudged.
Note:
1) There should be noAC or DC signal in the cable under
test.
2) Ifthe audio signal is badly received, the volume switch
of the receiver can be adjusted.
i!3
4.17NetworkCable Integrity Test
4.17.1 Regular T568A/T568B cables can bejudged for
open circuit, short circuit, miswiring, split pair,
reverse connection and shield integrity, and any
abnormality can bespecified.
4.17.2 Insert both ends of the cable into the jacks in the
front and lower part of the meter.
4.17.3 Press the "TEST" key for testing. If the abnormality
remains after the test, the "Abnormal" symbol will
flash.
4.17.4 The front jack box can be separated to detect any
fixed cable as the remote terminal conveniently.
Front cableinterface Tail cable interface
4.17.5 Insert a slotted screwdriver or any other flat object
into the notch and push up hard to remove the
front cable interface.
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MASTECH® MASTECH®
4.17.6 Below is a detailed description of different
abnormalities:
SHORT
MISWIRE
REVERSD
Note:
1) Ifthe cable undertest has noshield, the shield symbol
will flash to indicate open circuit, which is normal.
2) If the line status changes, be sure to press "TEST"to
close the current test result and then press "TEST"
again to test the line status.
i!5
4.18 Non-Contact Voltage Detection
4.18.1 Sockets and powercords can bedetected for the
presenceofACvoltage.
4.18.2 Bring the upper part of the meter close to a
conductor.When a voltage is detected, the meter
will give a sound and provide visual indication.
Front detection area of the meter
&. WARNING
There is the risk of electric shock.
A voltage may still be present even if there is no
indication. Do not rely on the non-contact voltage
detection function to judge whether a voltage is
present on a shielded wire. The detection operation
may be affected bysuch factors as socket design,
insulation thickness and type of wires.
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MASTECH® MASTECH®
4.19Operating Precautions of Protective Cover
&.WARNING
There is the risk of electric shock.
After the protective cover is lost, the voltage and
current measurementfunction of the meter should be
disabled for fear of electric shock.
4.19.1 There is a protective cover at the tail of the meter.
To avoid the risk of electric shock, the cable
interface must be protected by the protective cover
when the cable detection function is not used.
4.19.2 Thefigure below shows howthe protective cover is
usedwhen the cable detection function is used.
4.19.3 The figure below shows howthe protective cover is
used when the cable detection function is not used.
i!7
4.20 Automatic Power off
4.20.1 If the FUNC key or the range selector is not
operated within 15minutes during measurement,
the meter will be shut down and enter the sleeping
modeto save electricity.
4.20.2 To disable the automatic power off function, hold
on to the HOLD keyto start up the meter or press
the HOLD key in the sleeping mode to wake it up.
5. Maintenance
5.1 Replacement of Batteries
.& WARNING
Before opening the battery cover of the meter,
remove the test probes from the circuit under
test to avoid the risk of electric shock.
i!B

MASTECH® MASTECH®
5.1.1 When the "~" symbol is displayed, the batteries
should be replaced immediately.
5.1.2 Turnthe range selector to OFFand removethe test
wires from the inputterminals.
5.1.3 Unfasten the screws and remove the battery cover.
5.1.4 Mount new batteries, replace the battery cover and
fasten the screws.
5.2 Replacement of Fuse
&.WARNING
Before opening the battery cover, remove the test
probes from the circuit under test to avoid the risk of
electric shock.
To avoid fire hazards, be sure to use the designated
fuse (at rated voltage, amperage and blow rate).
i!9
5.2.1 Turnthe range selector to OFFand removethe test
leads from the input terminals.
5.2.2 Removethe protective cover and unfasten the
screws.
5.2.3 Removethe rear case, pry up one end of the fuse
gently and then removethe fuse from the clip.
5.2.4After a newfuse is mounted, replace the rear case
andfasten the screws.
5.3 Replacement of Test Probes
&.WARNING
The test probes must be replaced with those of the
same model or class, and must be kept in good
condition. Ratings of test probes: CAT III 600V 10A.
If the insulation of any test probe is damaged, e.g., a wire
is exposed, the test probe must be replaced.
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MASTECH®
6. Accessories
1 ) Test probes 1 pair
2) Test
connect line 1
3)
Receiver 1
4)
Protective cover 1
5) Remote unit
1
6)
Operation manual
1
It
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HYS006777 -V2