PCE Instruments PCE-UT81B User manual

www.pce-industrial-needs.com
Tursdale Technical Services Ltd
Unit N12B
Tursdale Business Park
Co. Durham
DH6 5PG
United Kingdom
Phone: +44 ( 0 ) 191 377 3398
Fax: +44 ( 0 ) 191 377 3357
[e-mail]
http://www.industrial-needs.com/
Manual
Handheld Oscilloscope
PCE-UT81B

[email protected]
2

Tableofcontents
Before You Start ...................................................................................................................................... 3
Overview.............................................................................................................................................. 3
Unpacking Inspection .......................................................................................................................... 3
Safety Information ............................................................................................................................... 4
Rules For Safe Operation..................................................................................................................... 4
International Electrical Symbols.......................................................................................................... 5
Using the Testing Tool............................................................................................................................. 5
Reading the Screen .............................................................................................................................. 5
The Meter Structure ............................................................................................................................. 6
Functional Buttons ............................................................................................................................... 7
Making Measurement .............................................................................................................................. 8
Introduction.......................................................................................................................................... 8
A.Scope Mode .......................................................................................................................... 8
B.Digital Multimeter Mode .................................................................................................. 11
Using Software....................................................................................................................................... 19
Maintaining The Test Tool .................................................................................................................... 19
A. General Service ....................................................................................................................... 19
B. Replacing the Fuses................................................................................................................. 19
C. Replacing the Battery .............................................................................................................. 20
Specifications......................................................................................................................................... 21

[email protected]
3
Before You Start
Overview
This Operating Manual covers information on safety and cautions. Please read the relevant information
carefully and observe all the Warnings and Notes strictly.
Warning
To avoid electric shock or personal injury, read the “Safety Information” and “Rules for Safe
Operation” carefully before using the Meter.
Scope Digital Multimeter UT81B (hereafter referred to as “the Meter”) is a 3999 counts and 3 3/4 digits
adopting digital control techique with both waveform and multimeter all in one.
Scope mode is a complete intelligent measurement system including signal input, sampling, data
process, auto search and waveform save and recall. It has bandwidth 8MHz, real-time sample rate
40MS/s with peak rate sampling process can catch up pulse industrial signal. It can measure AC/DC
engine, transducer, circuit, control, UPS and industrial equipments. It is an ideal tools in professional
repairing industries.
Digital Multimeter mode can measure AC voltage and current, DC voltage and current, Resistance,
Capacitance, Frequency, Duty Cycle, Diodes and Continuity.
Unpacking Inspection
Open the package case and take out the Meter. Check the items shown on Table 1-1 carefully to see any
missing or damaged part:
Table 1-1. Unpacking Inspection
Item Description Qty
1 English Operating Manual 1
piece
2 USB interface cable 1
piece
3 CD-ROM (Installation Guide & Computer
Interface Software)
1
piece
4 Test Lead 1 pair
5 Alligator Clip 1
piece
6 Power Adaptor 1
piece
7 1.5V Batteries (R6) 4
pieces
8 Scope Probe (available at extra cost) 1
piece
9 BNC probe (available at extra cost) 1
piece
In the event you find any missing or damage, please contact your dealer immediately.

[email protected]
4
Safety Information
This Meter complies with the standards IEC61010 safety measurement requirement: in pollution degree
2, overvoltage category (CAT. II 1000V, CAT.III 600V) and double insulation.
CAT.II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient overvoltages than
CAT. III
CAT. III: Distribution level, fixed installation, with smaller transient overvoltage than CAT. IV
Use the Meter only as specified in this operating manual, otherwise the protection provided by the Meter
may be impaired.
In this manual, a Warning identifies conditions and actions that may pose hazards to the user, or may
damage the Meter or the equipment under test.
A Note identifies the information that user should pay attention to.
International electrical symbols used on the Meter and in this Operating Manual are explained on page
XX.
Rules For Safe Operation
Warning
To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the
equipment under test, adhere to the following rules:
zBefore using the Meter inspect the case. Do not use the Meter if it is damaged or the case (or part of
the case) is removed. Look for cracks or missing plastic. Pay attention to the insulation around the
connectors.
zInspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity.
Replace damaged test leads with identical model number or electrical specifications before using the
Meter.
zDo not apply more than the 1000V rms between any terminal and grounding to avoid electric shock or
damages to the Meter.
zThe rotary switch should be placed in the right position and no any changeover of range shall be made
during measurement is conducted to prevent damage of the Meter.
zWhen the Meter working at an effective voltage over 60V in DC or 42V rms in AC, special care should
be taken for there is danger of electric shock.
zUse the proper terminals, function, and range for your measurements.
zDo not use or store the Meter in an environment of high temperature, humidity, explosive, inflammable
and strong magnetic field. The performance of the Meter may deteriorate after dampened.
zWhen using the test leads, keep your fingers behind the finger guards.
zDisconnect circuit power and discharge all high-voltage capacitors before testing resistance,
continuity, diodes.
zBefore measuring current, check the Meter’s fuses and turn off power to the circuit before connecting
the Meter to the circuit.
zReplace 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.
zWhen servicing the Meter, use only the same model number or identical electrical specifications
replacement parts.
zThe internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any
accident.
zSoft cloth and mild detergent should be used to clean the surface of the Meter when servicing. No
abrasive and solvent should be used to prevent the surface of the Meter from corrosion, damage and
accident.
zThe Meter is suitable for indoor use.
zTurn the Meter off when it is not in use and take out the battery when not using for a long time.
zConstantly check the battery as it may leak when it has been using for some time, replace the battery
as soon as leaking appears. A leaking battery will damage the Meter.

[email protected]
5
International Electrical Symbols
Symbols used on the Meter and in this manual are explained in Table1-2.
Table 1-2. International Electrical Symbols
AC or DC
DC Measurement
AC Measurement
Continuity Test
Diode
Grounding
Double Insulated
Warning. Re
f
er to the
O
p
eratin
g
Manual
Deficiency of Built-In Battery
C
on
f
orms to
S
tandards o
f
Euro
p
ean Union
Using the Testing Tool
Reading the Screen
The screen displays the menu that provides the following choices available:
Table 2-1. Reading the Screen
Display Description
Contrast The degree of contrast
Auto Off Sleep mode time
BK Light Display backlight
BEEP Beeper on and off
ENTER Confirm
▲Increase
▼Decrease
MOVE ▲Waveform moves up
MOVE ▼Waveform moves down
RANG▲Increase a range
RANG▼Decrease a range
BASE ▲Increase a time base
BASE ▼Decrease a time base
BASE > Waveform moves right
BASE < Waveform moves left
TRIG▲Trigger moves up
TRIG▼Trigger moves down
SLOP Trigger slope adjustment
AUTO Auto trigger mode
NORM Normal trigger mode
SHOT Single trigger mode

The M
e
The Figu
1. LC
D
2. Fun
c
3. Rot
a
4. CO
M
5. mA
μ
e
ter Struc
t
re 2-1 show
s
D
Display
c
tional Butto
a
ry Switch
M
Input Ter
m
μ
AInput Ter
m
t
ure
s
the Meter
s
ns
m
inal
m
inals
s
tructure.
Figure 2-1. Meter S
t
ructure
i
i
nfo@tursdalete
c
c
hnicalservices.c
o
o
.u
k
6

6. Oth
e
7. Po
w
8. US
B
9. 10A
Functi
o
The butto
n
Table 2-2
.
Bu
t
F1,
Ra
n
Ti
m
Tri
g
Au
t
Mo
d
Se
t
Sa
v
Ho
l
e
r Input Ter
m
w
er adaptor I
n
B
Terminals
Input Termi
n
o
nal Butt
o
n
s activate fe
a
.
t
tons
F2, F3 and
n
ge
m
e
g
t
o
d
e
t
v
e/Call
l
d
m
inals
n
put Termin
a
n
al
o
ns
a
tures that au
g
F4
a
ls
g
ment the fun
Figur
e
Tabl
e
Descripti
o
Software f
u
Under sco
and AC m
e
Under sco
base.
Under sco
mode.
In multime
mode whe
button is i
n
buzzer an
d
In scope
m
base to a
u
To switch
b
reading (
m
voltage, fr
e
Press Set
and beep
Under sco
Press Hol
d
ction selecte
d
e
2-2. Function
a
e
2-2. Function
a
o
n
u
nctional bu
t
pe mode, P
r
e
asuremen
t
pe mode, pr
e
pe mode, pr
e
ter mode:
P
n measurin
g
n
valid when
m
d
capacitan
c
m
ode: Press
u
to.
b
etween wa
v
m
ultimeter m
o
e
quency, cu
r
button to se
pe mode, pr
e
d
button to
e
d
with the rota
r
a
l Buttons
a
l Buttons
t
tons, detail
s
r
ess Range
b
e
ss Time b
u
e
ss Trig bu
t
P
ress Auto
b
g
resistance,
m
easuring c
a
c
e.
Auto button
v
eform displ
a
o
de). This b
r
rents mode.
t the auto p
o
e
ss Save/C
a
e
nter or exit
h
i
r
y switch. Th
e
s
please refe
b
utton to sw
u
tton to set t
h
t
ton to chan
g
b
utton to ent
e
voltage and
a
pacitance,
to set the a
m
a
y (scope m
utton is only
o
wer off, bac
a
lto store a
n
h
old mode.
i
nfo@tursdalete
c
e
buttons are
r to the belo
w
itch betwee
n
h
e X-axis of
t
g
e the trigge
r
e
r auto rangi
current. Th
diode, conti
n
m
plitude an
d
ode) and di
g
valid when
u
c
klight, contr
a
n
d recall dat
a
c
hnicalservices.c
o
shown in
w
.
n
DC
t
ime
r
ng
is
n
uity
d
time
g
ital
u
nder
a
st
a
.
o
.u
k
7

[email protected]
8
Making Measurement
Introduction
Chapter 3 explains how to make measurements.
You could turn the Meter off by turning to OFF position or set up the sleep mode from 1-30 minutes.
Please must ensure the Meter is not under sleep mode if you turn the Meter on but without display.
To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery
as soon as the battery indicator “ ” appears.
A. Scope Mode
zThe LCD top right part display: RUN, HLD, REV
zThe LCD top right corner has battery icon to indicate when the battery is lower than 5V.
zUnder scope mode, both reading and waveform will be displayed.
i. Setting up Sleep Mode, Contrast, Beep
Based on the working environment to set up sleep mode, contrast, beep
Press Set button to set the auto power off, display backlight, contrast and beep
Auto off Bk Light Contrast Beep
F1 F2 F3 F4
F1: Set auto power off time
Auto off ▲15 ▼ENTER
F1 F2 F3 F4
The time level is from OFF, 1 to 30 minutes. Press F4 to confirm, save and return. Press functional
button to exit and the setting remains unchanged.
F2: Set the Display Backlight
BK Light ▲15 ▼ENTER
F1 F2 F3 F4
The brightness level from 0 to 31. Press F4 to confirm, save and return. Press functional buttons to exit,
the setting is kept, but will not save. The setting will be lost after power off.
F3: Set the LCD contrast
Contrast ▲15 ▼ENTER
F1 F2 F3 F4
The contrast level from 0 to 31. Press F4 to confirm, save and return. Press functional buttons to exit,
the setting is kept, but will not save. The setting will be lost after power off.
F4: Set the beeps features, it can only be used under resistance, diode and continuity measurement.
Beep ON OFF ENTER
F1 F2 F3 F4
F2 to turn the beep on
F3 to turn the beep off
F4 to confirm , save and return
Press functional buttons to exit, the setting is kept, but will not save. The setting will be lost after power
off.

[email protected]
9
ii. ACV, DCV, Hz, ACA and DCA range
Turn the rotary switch to ACV, DCV, Hz, ACA or DCA range, the Meter displays digital reading
(Multimeter mode). Press Mode to switch to waveform display (scope mode) as below Figure 4. When
entering scope mode, time base is auto trace, the amplitude is manual set, you may need to re-set them.
You could set the trigger level as well if it is needed. Details of measurement operation of ACV, DC, Hz,
ACA or DCA can be seen from B. Digital Multimeter Mode:
Figure 3-1. Waveform Display
zPress Range to switch between DC and AC measurement.
zWhen the frequency and amplitude of a waveform is unknown, press Auto:
¾When the amplitude is set to auto, the amplitude indicator will be shown white text in black
background. When the amplitude is set to manual, the amplitude indicator will be shown black text in
white background.
¾When the time base is set to auto, the time base indicator will be shown white text in black
background. When the time base is set to manual trace, the time base indicator will be shown black
text in white background.
¾When the time base is between 20ms – 100ns, it is possible to set the auto. When the time base is
between 50ms – 5s, the auto feature will be in valid.
zY-axis adjustment: Press Range button under scope mode, the corresponding functional button:
Move ▲Move ▼Rang ▲Rang ▼
F1 F2 F3 F4
F1: move up the waveform
F2: move down the waveform
F3: go up range
F4: go down a range
The auto set feature will be off when changing the measurement mode

[email protected]
10
zPress Time button under scope mode, the corresponding functional button:
Base ▲Base ▼Base < Base >
F1 F2 F3 F4
F1: increase the number of periods
F2: decrease the number of periods.
F3: Trigger point move left
F4: Trigger point right move
The auto set feature will be off when changing the measurement mode.
iii. Trigger function
Press Trig button under scope mode, the corresponding function buttons:
Trig ▲ Trig ▼Auto/Norm/Shot Slop Rrise/Fall
F1 F2 F3 F4
F1: move the trigger level up
F2: move the trigger level down
F3: select the trigger mode: auto, normal or single
F4: slope adjustment: rise or fall
iv. Waveform data save and recall
Press Save/Call button under scope mode, the corresponding functional buttons:
Save/Call ▲1 ▼Enter
F1 F2 F3 F4
F1: save or recall
F2 and F3: select location (location from 0-9, total 10 location)
F4: confirm
zWhen saving the data, it will overwrite the current data in the location no matter that location has
data or not.
zIf you recall the location has no data, the meter will appear error message, you need to press HOLD
button to continue measurement,
zIf you recall the location has data, it will save the current setting and display the data, the LCD top
left shows REV to indicate recalling mode is on. Press HOLD button to return to working mode and
continue measurement. You could continue recalling under recall mode or save the data.
zRecall mode can be used under any scope mode. For example, it is possible to recall the waveform
or data saved from voltage or frequency mode when the meter is under current measurement mode.
zRecall mode can be worked under any waveform mode. For example: the Meter is at current mode
but recalling the waveform or data which are saved under voltage or frequency mode. The Meter must be
returned to working mode to carry out measurement.
Remarks:
In order to have more accurate waveform, user can buy an optional BNC probe and scope probe to
decrease signal attenuates. The scope probe directly connect to the BNC probe.
When measuring voltage and frequency signal, connect the BNC black probe to the COM input terminal
and the red probe to the voltage terminal.
When measuring current signal, connect BNC black probe to the COM terminal and the red probe to mA
terminal.
Don’t connect the BNC probe to the 10A terminal.

[email protected]
11
B. Digital Multimeter Mode
i.Measuring Voltages
Warning
To avoid harms to you or damages to the Meter from electric shock, please do not attempt to measure
voltages higher than DC 1000V, AC 750V, although readings may be obtained.
To measure voltages, set up the Meter as Figure 3-2 and do the following:
BlackRed
Figure 3-2. Voltages Measurement
1. Insert the red test lead into the Vterminal and the black test lead into the COM terminal.
2. Set the rotary switch to V.
3. Connect test leads across with the object being measured.
4. The measured value shows on the display..
5. Press MODE button to toggle between Multimeter mode and Scope mode.
6. Press F1 to toggle between AC and DC voltage measurement.
When measuring voltage, the corresponding functional buttons
AC / DC REL Rang ▲ Rang ▼
F1 F2 F3 F4
F1: Toggle between AC or DC
F2: relative mode (REL will be displayed at the right bottom of the LCD when it is on)
F3: select a range up
F4: select a range down
Note:
zAfter changing the measurement mode, the autoranging will be off automatically and the AUTO will
be disappeared at the bottom left of the LCD.
zWhen voltage measurement has been completed, disconnect the connection between the testing
leads and the circuit under test and remove testing leads away from the input terminals of the Meter.

[email protected]
12
II. Measuring Currents
Warning
If the fuse burns out during measurement, the Meter may be damaged or the operator himself may be
hurt.
To avoid possible damage to the Meter or to the equipment under test, check the Meter’s fuses before
measuring current. Use proper terminals, function, and range for the measurement. Never place the
testing leads in parallel with any circuit or component when the leads are plugged into the current
terminals.
Turn off power to the circuit before test leads are connected in series to the return circuit to be tested.
zμA Range Measurement
To measure ACμAor DCμAcurrents, set up the Meter as Figure 3-3 and proceed as follows:
Black Red
Figure 3-3. μA Range Measurement
1. Insert the red test lead into the μAmA terminal and black test lead into the COM terminal.
2. Set the rotary switch to μA.
3. Connect the test lead in series with the return circuit to be tested.
4. The measured value shows on the display.
5. Press MODE button to toggle between Multimeter mode and Scope mode.
6. Press F1 to toggle between AC and DC current measurement.
zmA Range Measurement
To measure ACmAor DcmA currents, set up the Meter as Figure 3-4 and proceed as follows:

[email protected]
13
Black Red
Figure 3-4. mA Range Measurement
1. Insert the red test lead into the μAmA terminal and black test lead into the COM terminal.
2. Set the rotary switch to mA .
3. Connect the test lead in series with the return circuit to be tested.
4. The measured value shows on the display.
5. Press MODE button to toggle between Multimeter mode and Scope mode.
6. Press F1 to toggle between AC and DC current measurement.
z10A Range Measurement
To measure AC 10Aor DC 10Acurrents, set up the Meter as Figure 3-5 and proceed as follows:
Black Red
Figure 3-5. 10A Range Measurement
1. Insert the red test lead into the 10A terminal and black test lead into the COM terminal.
2. Set the rotary switch to A.
3. Connect the test lead in series with the return circuit to be tested.
4. The measured value shows on the display.

[email protected]
14
5. Press MODE button to toggle between Multimeter mode and Scope mode.
6. Press F1 to toggle between AC and DC current measurement.
When measuring current, the corresponding functional buttons:
AC / DC REL Rang ▲ Rang ▼
F1 F2 F3 F4
F1: Toggle between AC or DC
F2: relative mode (REL will be displayed at the right bottom of the LCD when it is on)
F3: select a range up
F4: select a range down
Note
zAfter changing the measurement mode, the autoranging will be off automatically and the AUTO will
be disappeared at the bottom left of the LCD.
zIf the value to be measured is unknown, use the maximum measurement position and reduce the
range step by step until a satisfactory reading is obtained.
zWhen the measured current is ≤5A, continuous measurement is allowed.
zWhen the measured current is between 5A-10A, continuous measurement ≤10 seconds and interval
more than 15 minutes.
zWhen current measurement has been completed, disconnect the connection between the testing
leads and the circuit under test and remove testing leads away from the input terminals of the Meter.
iii. Measuring Resistance
Warning
To avoid possible damages to the Meter or to the devices under test, disconnect circuit power and
discharge all the high-voltage capacitors before measuring resistance.
To measure resistance, set up the Meter as shown in Figure 3-6 and follow the following procedure:
BlackRed
Figure 3-6. Resistance Measurement
1. Insert the red test lead into the Ω terminal and the black test lead into the COM terminal.
2. Set the rotary switch to Ω.
3. Connect the test leads across with the object being measured.
4. The measured value shows on the display.

[email protected]
15
When measuring resistance, the corresponding functional buttons:
RES REL Rang ▲ Rang ▼
F1 F2 F3 F4
F1: toggle to diode mode
F2: relative mode
F3: select to a range up
F4: select to a range down
Note:
zWhen measuring low resistance, the test leads can add 0.1Ωto 0.2Ωof error to resistance
measurement. To test the leads, touch the probe tips together and read the resistance of the leads.
Take the reading obtained to subtract the resistance of the leads to get the final reading.
zFor high-resistance measurement (>1MΩ) or low resistance measurement (<40Ω), it is normal taking
several seconds to obtain a stable reading.
zThe LCD displays “OL” indicating open-circuit without input.
zWhen resistance measurement has been completed, disconnect the connection between the testing
leads and the circuit under test and remove testing leads away from the input terminals.
iv. Testing Diodes
Warning
To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 42V rms AC.
To avoid damages to the Meter or to the devices under test, disconnect circuit power and discharge all
the high-voltage capacitors before testing diodes.
Use the diode test to check diodes, transistors, and other semiconductor devices. The diode test sends a
current through the semicondutor junction, then measure the voltage drop across the junction. A good
silicon junction drops between 0.5V and 0.8V
To test the diode out of a circuit, set up the Meter as Figure 3-7 and proceed as follows:
BlackRed
Figure 3-7. Diode Test

[email protected]
16
1. Insert the red test lead into the Ωterminal and the black test lead into the COM terminal.
2. Set the rotary switch to Ω.
3. For forward voltage drop 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. The red test lead
polarity is “+” while the black test lead polarity is “— “.
The measured value shows on the display.
When measuring diode, the corresponding functional buttons:
DIODE REL
F1 F2
F1: toggle to continuity buzzer
F2: relative mode
Note:
zConnect the test leads to the proper terminals as said above to avoid error display.
zThe LCD will display OL indicating either open circuit or wrong polarity connection.
zThe unit of diode is volt (V), displaying the positive-connection voltage-drop value.
zWhen diode testing has been completed, disconnect the connection between the testing leads and
the circuit under test and remove the test leads away from the input terminals.
v. Testing for Continuity
Warning
To avoid harms to you, please do not attempt to input voltage higher than 60V DC or 42V rms AC.
To avoid possible damages to the Meter or to the devices under test, disconnect circuit power and
discharge all the high-voltage capacitors before measuring continuity.
To test for continuity, set up the Meter as Figure 3-8 and do the following:
BlackRed
Figure 3-8. Continuity Test
1. Insert the red test lead into the Ωterminal and the black test lead into the COM terminal.
2. Set the rotary switch toΩ.
3. Connect the test leads across with the object being tested.

[email protected]
17
4. The tested circuit overload resistance value shows on the display.
5. The beeper comes on continuously for open conditions, that is test resistance ＜10Ω.
6. The beeper does not sound when the test resistance is ＞100Ω
When measuring continuity buzzer, the corresponding functional buttons:
CONTINUITY REL
F1 F2
F1: toggle to resistance measurement mode
F2: relative mode
Note:
zWhen continuity testing has been completed, disconnect the connection between the testing leads
and the circuit under test and remove the test leads away from the input terminals.\
vi. Measuring Frequency / Duty Cycle
Warning
To avoid harms to you, please do not attempt to input voltage higher than 42V rms.
To measure frequency and duty cycle, connect the Meter as Figure 3-9 and do the following:
BlackRed
Figure 3-9. Measuring Frequency / Duty Cycle
1. Insert the red test lead into the Hz terminal and the black test lead into the COM terminal.
2. Set the rotary switch to Hz.
3. Connect the test leads across with the object being measured.
4. The measured value shows on the display.
5. Press MODE button to toggle between Multimeter mode and Scope mode.
6. Press F1 to toggle between frequency and duty cycle measurement.
When measuring frequency and duty cycle, the corresponding functional buttons:
\Freq/Duty
F1
F1: toggle between frequency and duty cycle

[email protected]
18
Note
zThe requirement of Input amplitude “a” is as follows:
When ≤1MHz: 300 mV≤a≤30Vrms;
＞1MHz: 600 mV≤a≤5Vrms
zIt is normal to have few seconds run time when switch from other functions to these functions.
zWhen Hz or duty cycle measurement has been completed, disconnect the connection between the
testing leads and the circuit under test and remove the test leads away from the input terminals.
vii. Measuring Capacitance
Warning
To ensure accuracy, the Meter inside is discharged against the tested capacitor
To avoid damage to the Meter or to the equipment under test, disconnect circuit power and discharge all
high-voltage capacitors before measuring capacitance.
To measure capacitance, set up the Meter as shown in Figure 3-10 and proceed as follows:
BlackRed
Figure 3-10. Measuring Capacitance
1. Insert the red test lead into the terminal and the black test lead into the COM terminal.
2. Set the rotary switch to measurement mode, the Meter may display a fixed reading which is a
internal distributed capacitor value. For testing less than 40nF capacitor, the tested value must
subtract the internal distributed capacitor value to maintain the accuracy.
3. To improve the accuracy, press F2 REL with the test leads open to subtract the residual capacitance
of the Meter and the test leads.
4. It is recommended to use as short as test lead carrying out measurement to reduce the effect of
internal distributed capacitor.
When measuring capacitance, the corresponding functional buttons:
Capacity REL
F1 F2
F2: relative mode
Note:
zCapacitors larger than 10μF take longer time.
zIf the tested capacitor has polarity, connect the red test lead to positive side and black test lead to
negative side.

[email protected]
19
zWhen capacitance measurement has been completed, disconnect the connection between the
testing leads and the circuit under test and remove the test leads away from the input terminals of
the Meter.
Using Software
When using the Software, please refer to the Installation Guide of the included CD-ROM.
Maintaining The Test Tool
This chapter provides basic maintenance information including battery and fuse replacement instruction.
Warning
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.
A. General Service
zPeriodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents.
zTo clean the terminals with cotton bar with detergent, as dirt or moisture in the terminals can affect
readings.
zTurn the Meter to OFF when it is not in use.
zTake out the battery when it is not using for a long time.
zDo not use or store the Meter in a place of humidity, high temperature, explosive, inflammable and
strong magnetic field.
B. Replacing the Fuses
1 、取下电池盖
2 、取下产品后壳
3
、按需要更按保险丝

[email protected]
20
取下電池蓋: Remove the battery compartment
取下產品後殼: Remove the case bottom
按需要更換保險絲: Install fuses with correct type and specification
Figure 5-1. Fuse Replacement
Warning
To avoid electrical shock or arc blast, or personal injury or damage to the Meter, use specified fuses
ONLY in accordance with the following procedure.
Follow Figure 5-1 and proceed as follows to replace the Meter’s fuse:
zTurn the rotary switch to OFF and remove all connections from the terminals.
zRemove the screw from the battery compartment, and separate the battery compartment from the
case bottom.
zRemove the three screws from the case bottom, and separate the case bottom from the case top.
zRemove the fuse by gently prying one end loose, then take out the fuse from its bracket.
zInstall ONLY replacement fuses with the identical type and specification as follows and make sure
the fuse is fixed firmly in the bracket.
Fuse 1: 0.5A, 250V, fast type fuse, ø5×20mm
Fuse 2: 10A, 250V, fast type fuse, ø5×20mm
zRejoin the case bottom and case top, battery compartment and case bottom, and install the 5
screws.
Replacement of the fuses is seldom required. Burning of a fuse always results from improper operation.
C. Replacing the Battery
Figure 5-2. Battery Replacement