- 1 -
- 2 -
- 3 -
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AUTOMOTIVE
DIGITAL MULTIMETER
KT-2021
To prevent an electrical shock hazard to the operator and/or damage to the instruments,
read this instruction manual carefully before using the instrument.
WARNINGS
with the
symbol on the instrument and this instruction manual are highly important.
Important Symbols
The symbol in this manual advises the user of an electrical shock
hazard that could cause injury or material damages.
1. DISPLAY
（
LCD
）
a. Numerical Display
：
4 digit 6000 count, with Bar Graph
b. Units and Symbols
：
2. OPERATING PRINCIPLE
：
Sigma-delta Conversion
3. MEASURING PRINCIPLE
：
Average Rectification
4. SAMPLING RATE
：
5 times per second (Bar Graph
：
40 times per second max.)
5. RANGE SELECTION
：
Auto / Manual (Frequency, Injection Pulse width and
Capacitance measurement are Auto only)
6. BATTERY WARNING
：
indication at approx. 2.3V or less
7. DISPLAY HOLD
：
Hold indicating values by pressing HOLD Key
8. AUTO POWER OFF
：
Power turns off automatically after approx. 34 minutes
9. OVERLOAD PROTECTION
：
10. OPERATING TEMPERATURE & HUMIDITY
：
0 to 30
℃
,
less than
80
％
RH
／
31 to 40
℃
,
less than
50
％
RH in non-condensing.
11. STORAGE TEMPERATURE & HUMIDITY
：
-20 to 60
℃
,
less than
80%RH in non-condensing.
12. TEMPERATURE COEFFICIENT
：
Accuracy at 23
℃
±
5
℃
×
0.15/
℃
13. SAFETY LEVEL
：
CE marking approved.
14. POWER SUPPLY
：
1.5V R03(AAA) Battery
×
2
15. FUSE
：
Fast-acting 0.63A/500V
(
φ
6.0
×
32mm
) ×
1,
Fast-acting 6.3A/500V
(
φ
6.0
×
32mm
) ×
1
16. POWER CONSUMPTION
：
approx.
4.3mA
(in Auto Power Off
：
approx. 10
μ
A, in backlighting
：
approx. 27mA)
17. CONTINUOUS OPERATING TIME
：
approx. 180 hours (manganese cell),
approx. 360 hours (alkaline cell)
18. DIMENSIONS & WEIGHT
：
161(H)
×
80(W)
×
50(D)mm, approx. 340g
19. ACCESSORIES
：
20. OPTIONAL ACCESSORIES
：
a)
μ
A & mA
：
0.63A/500V fast-acting fuse
b) A
：
6.3A/500V fast-acting fuse
c) V
：
1050Vrms or 1450Vpeak
d) mV,
Ω
and others
：
600Vrms
Thank you for purchasing
"KT-2021 AUTOMOTIVE DIGITAL MULTIMETER"
. To obtain the
maximum performance of this instrument, read this Instruction Manual carefully, and take
safe measurement.
Confirm if the following items are contained in the package in good condition.
If there are any damage or missing items, ask your local dealer for replacement.
1. Digital Multimeter (with holster)
2. Test Lead (100-66)
3. RPM Sensor (653 / for Direct Ignition Engine)
4. RPM Sensor (654 / for High Tension Code)
5. Temperature Probe (818-02)
6. Alligator Clip (943)
7. Carrying Case (1024)
8. Spare Fuse (F20, 0.63A/250V and F32, 6.3A/500V)
9. Instruction Manual
2. SPECIFICATIONS
Do not measure High Power Line (High Energy Circuits) that might exceed 6kVA. High
Power Line is very dangerous and sometimes includes High Surge Voltage that could
cause explosive short in the instrument and could result in serious injury to the operator. For
dangerous voltage measurement, always keep the instrument away from your body without
holding it in your hands. Do not touch the instrument, test leads, and any part of the circuit.
WARNING
FOR SAFETY MEASUREMENTS!!
INSTRUCTION MANUAL
The symbol listed in IEC 61010-1 and ISO 3864 means "Caution (refer to
instruction manual)".
WARNING
CAUTION
The symbol in this manual advises the user of an electrical shock
hazard that could result in serious injury or even death.
INTRODUCTION
1. UNPACKING AND INSPECTIONS
1 pce.
1 set
1 pce.
1 pce.
1 pce.
1 pce.
1 pce.
1 pce. each
1 pce.
AUTO, , , , , RPM , RPM , , ,
Ω
, k
Ω
, M
Ω
,
Hz, kHz, ms, V,
μ
F,
μ
A, mA, A,
％
, Trig and decimal point
2-1. GENERAL SPECIFICATIONS
2-2. MEASUREMENT SPECIFICATIONS
(23
℃
±
5
℃
, <80
％
RH in non-condensing)
1. DC Voltage ( mV / V )
6.000 V
60.00 V
600.0 V
1000 V
±
0.4
％
rdg
±
3dgt
±
0.7
％
rdg
±
3dgt
Range
60.00 mV
600.0 mV
≒
10M
Ω
,
50pF
600Vrms
Accuracy
±
0.4
％
rdg
±
3dgt
±
0.3
％
rdg
±
3dgt
Resolution
0.01 mV
0.1 mV
Input
Impedance
Overload
Protection
≒
10M
Ω
,
50pF
1050Vrms
1450Vpeak
1 mV
10 mV
100 mV
1 V
2. AC Voltage (
〜
mV / V ) 50Hz to 500Hz
Average Rectification
3. DC Current (
μ
A / mA / A )
6A Continuous measurement is possible.
10A is measurable within 30 seconds but 5 minutes cooling down interval is necessary.
※
4. AC Current (
〜
μ
A / mA / A ) 50Hz to 500Hz
6A Continuous measurement is possible.
10A is measurable within 30 seconds but 5 minutes cooling down interval is necessary.
※
Average Rectification
5. Resistance (
Ω
)
Range
600.0
Ω
6.000 k
Ω
60.00 k
Ω
600.0 k
Ω
6.000 M
Ω
60.00 M
Ω
0.45V DC
Accuracy
±
0.5
％
rdg
±
6dgt
±
0.5
％
rdg
±
3dgt
±
0.8
％
rdg
±
4dgt
±
1.0
％
rdg
±
5dgt
±
1.5
％
rdg
±
5dgt
Resolution
0.1
Ω
1
Ω
10
Ω
100
Ω
1 k
Ω
10 k
Ω
Open Circuit Voltage
6. Frequency ( Hz )
Function
6 V
60 V
600 V
1000 V
±
0.1
％
rdg
±
3dgt
Range (Auto)
10 Hz to 10 kHz
10 Hz to 50 kHz
45 Hz to 1 kHz
Sensitivity
0.5 V rms
5 V rms
50 V rms
500 V rms
Accuracy
NOTE :
Measurement cannot be made depending on the vehicles.
RPM4
RPM2
RPM2-M
Range
240 to 20000RPM
120 to 10000RPM
60 to 5000RPM
7. IP-RPM ( Inductive Pickup type )
±
0.2
％
rdg
±
20dgt
Accuracy
LVD
：
V/
Ω
Terminal
；
CAT
Ⅱ
1000V AC/DC,
μ
A/
mA/A Terminal
；
CAT
Ⅱ
450V AC/DC
EMC
：
EN61326-1 (2006)
NOTE :
Measurement cannot be made depending on the vehicles.
RPM4
RPM2
RPM2-M
Range
60 to 20000RPM
30 to 10000RPM
15 to 5000RPM
8. IG-RPM ( Contact Signal type )
±
0.2
％
rdg
±
20dgt
Accuracy
Selectable Number of Cylinders
1,2,3,4,5,6,8,10,12
(Select by
CYLINDER Key
)
WARNING 1. Checks of Body and Test Lead
WARNING 3. Warning for High Voltage Measurements
WARNING 4. Dangerous Voltage Measurement Procedure
WARNING 2. High Power Line Measurements is Prohibited
Before measurement, confirm the body of this instrument and handle insulators of the Test
Lead have no cracks or any other damages. Dust, grease and moisture must be removed.
Do not hold multimeter in your hands. Keep safety distance from power source or circuit
to be measured not to touch the dangerous voltage.
Attach black and red alligator clips to test lead pins.
Turn off the power of the circuit to be measured when connecting test leads.
After measurement, before detaching alligator clips (test leads), turn the circuit power off
and discharge the all capacitors.
●
●
●
●
For dangerous voltage measurement, strictly observe the warnings below.
3-1. WARNINGS
Correct knowledge of electric measurements is essential to avoid unexpected danger such
as operator's injury or damage to the instrument. Read carefully and observe the following
precautions for safety measurements.
3. SAFETY PRECAUTIONS
Even for Low Energy Circuits of electric/electronic appliances, such as heating elements,
small motors, line cords and plugs, High Voltage Measurements are very dangerous. Do not
touch any part of the circuit.
Do not measure High Power Line (High Energy Circuits) such as Distribution Transformers,
Bus Bars and Large Motors. High Power Line sometimes includes High Surge Voltage that
could cause explosive short in the instrument and could result in shock hazard. Generally,
shock hazard could occur when the current between the circuit, that involves more than 33V
rms or 46.7V DC or peak, and ground goes up to 0.5mA or more.
WARNING 1. Correct Selection of Function Switch
WARNING 2. Maximum Input Observance
WARNING 3. Test Lead Detachment
Do not measure anything that might exceed the specified maximum input values.
Always confirm that
FUNCTION
Switch is set to the correct position. Do not measure voltage
except at Voltage measurement function.
Detach test leads from measuring circuit before changing measurement functions or
removing rear cover for battery or fuse replacement.
In case of live-line measurement, strictly observe the warnings below
Do not hold multimeter in your hands. Keep safety distance from power source or circuit
to be measured not to touch the dangerous voltage.
Black test lead : Attach black alligator clip and connect to
−
(earth) side of the circuit.
Red test lead : Connect to
＋
(positive) side of the circuit.
●
●
●
3-3. GENERAL WARNINGS AND CAUTIONS
Children and the persons who do not have enough knowledge about
electric measurements must not use this instrument.
Do not measure the electricity naked or barefooted to protect yourself
from electrical shock hazard.
Be careful not to get hurt with the sharp test lead pins.
Do not polish the case or attempt to clean it with any cleaning fluid like
gasoline or benzine. If necessary, use silicon oil or antistatic fluid.
Away the instrument from hot and humid conditions like in the car. Do not
apply hard mechanical shock or vibration.
Remove the battery when the instrument is out of use for a long time. The
exhausted battery might leak electrolyte and corrode the inside.
WARNING 1.
WARNING 2.
WARNING 3.
CAUTION 1.
CAUTION 2.
CAUTION 3.
CAUTION 4.
Power turns off automatically after approx. 34 minutes of last operation.
To cancel it :
Turn the power on holding down
Select
Key. Auto power off is disabled.
NOTE :
Small current consumption remains even in the auto power off condition.
Be sure to set
FUNCTION
Switch to
"OFF"
after finishing the measurement.
Caution (refer to instruction manual)
〜
〜
Alternating Current
Direct Current
Earth (Ground)
Fuse
Double Insulation
DC / AC
Do not apply around, or remove from HAZARDOUS LIVE conductors.
LCD displays "
OL
" when measurement value exceeds the maximum value of each
measurement range.
The following symbol marks shown on the instrument and instruction manual are listed in
IEC 61010-1 and ISO 3864.
0.63A/500V and 6.3A/500V fuses are installed to protect current measurement functions. If
the fuse is blown out, replace it referring to "
7-1. BATTERY AND FUSE REPLACEMENT
".
4. NAME ILLUSTRATION
fig-1
LCD
Range Key
Level Key
FUNCTION Switch
KT-2021
Automotive DMM
Hold Key
±
TRIGGER Key
Key
CYLINDER Key
Select Key
Key
Input
Terminals
(
(
(
(
fig-2
4-1. LCD
：
Auto-ranging
：
Low battery warning
：
Dwell angle measurement
：
Continuity test
：
Lights up
in display hold function
：
RPM measurement
：
Direct current (DC)
RPM
：
Alternating current (AC)
：
Resistance measurement
：
Frequency measurement
：
Injection pulse width measurement
：
Voltage measurement
：
Capacitance measurement
：
Current measurement
：
Duty cycle
Ω
, k
Ω
, M
Ω
Hz, kHz
ms
mV, V
μ
F
μ
A, mA, A
％
4-11. Input Terminals
4-10. Level Key
Use this key to select the sensitivity level in IP-RPM, IG-RPM, Dwell Angle and Injection
Pulse Width measurements.
Connect black test lead to COM terminal and red test lead to RPM/Temp+/
Ω
/V/ Terminal
for all measurements except
μ
A, mA, A measurements.
NOTE
：
Connect red test lead to mA/
μ
A terminal for mA/
μ
A measurement and connect it to
A terminal for 6A (10A for 30sec) measurement.
5. MEASUREMENT PROCEDURES
5-1. PREPARATION FOR USE
Read INSTRUCTION MANUAL carefully to understand the specification and functions
correctly. "
3. SAFETY PRECAUTIONS
" is very important for safety measurement.
1. INSTRUCTION MANUAL
2. BATTERY
Two 1.5V R03 batteries are installed in this instrument. When " " lights up on LCD, replace
them into the new ones referring to "
7-1. BATTERY AND FUSE REPLACEMENT
".
3. FUSE
4. OVERLOAD INDICATION
5. AUTO POWER OFF
6. SYMBOL MARK
※
Specified ranges depend on engine rpm and number of cylinders (cyl).
Range
※
0.0
°
to 360.0
°
0.0
％
to 100.0
％
Accuracy
±
1.2
°
/krpm
±
1dgt
±
0.04
％
/krpm/cyl
±
2dgt
9. Dwell Angle ( ), Duty Cycle (
％
)
Selectable Number of Cylinders
1,2,3,4,5,6,8,10,12
(Select by
CYLINDER Key
)
※
Specified ranges depend on trigger slopes, engine rpm and number of cylinders (cyl).
Accuracy
±
0.05ms
±
1dgt
±
0.04%/krpm
±
2dgt
±
0.05ms
±
1dgt
±
0.04%/krpm/cyl
±
2dgt
Range
※
0.05ms to 250.0ms
0.0% to 100.0%
0.05ms to 250.0ms
0.0% to 100.0%
10. Injection Pulse Width ( ms ), Duty Cycle (
％
)
Multi Point Injection
Single Point Injection
WARNING
●
●
●
Do not measure any voltage that might exceed maximum input value.
(V
：
1000V AC/DC, mV
：
600mV AC/DC).
Read "
3. SAFETY PRECAUTIONS
" carefully to avoid electric shock hazard and
serious damage to the instrument.
Do not touch any part of power line or the circuit to be measured.
1
．
2
．
3
．
4
．
5
．
6
．
Connect the instrument
IN
PARALLEL
to the circuit.
Use alligator clips for dangerous
voltage measurement.
NOTE
：
Display shows " V
→〜
V
→
Hz "
each time the
Select
Key is pressed.
Connect black test lead to
−
(earth) side
of the circuit being measured and connect
red test lead to
＋
(positive) side.
NOTE :
NOTE :
Read the measurement value on LCD.
After finishing the measurement, set
FUNCTION
Switch to
"OFF"
.
5-2. VOLTAGE AND FREQUENCY MEASUREMENT ( V /
〜
V / Hz ) ( mV /
〜
mV)
KT-2021
Automotive DMM
fig-3
Battery voltage
measurement
Black(
−
)
Red(
＋
)
Battery
( V /
〜
V / Hz )
Insert black test lead to
COM
terminal, and insert red test lead to
RPM/Temp
＋
/
Ω
/V/
terminal.
Set
FUNCTION
Switch to " ".
Press
Select
Key to select DC( ) or AC( ).
〜
V
Hz
100-66 Test Lead, 653 RPM Sensor (for Direct Ignition), 654 RPM Sensor (for High
Tension Code), 818-02 Temperature Probe, 943 Alligator Clip, 1024 Carrying Case,
Holster, 1.5V R03(AAA) Battery (Installed), F20 Spare Fuse (0.63A/500V), F32 Spare
Fuse (6.3A/500V), Instruction Manual
11. Diode Test ( )
Range
1.000 V
Test Current
0.50mA typ.
Open Circuit Voltage
＜
1.6V DC typ.
Accuracy
±
1.0
％
rdg
±
3dgt
K-type thermocouple / sensor accuracy is not included.
Range
‑
50
°
C to 1000
°
C
‑
58
°
F to 1832
°
F
Accuracy
±
0.5
％
rdg
±
3dgt
±
0.5
％
rdg
±
6dgt
12. Temperature (
°
C
／
°
F )
Range
6.000
μ
F
60.00
μ
F
600.0
μ
F
2000
μ
F
Accuracy
±
2.0
％
rdg
±
5dgt
±
3.5
％
rdg
±
5dgt
±
4.0
％
rdg
±
5dgt
14. Capacitance ( )
660 AC/DC Clamp Adapter, 100-41 Test Lead Kit, 100-62 Test Lead Set, 944 Test Pin,
946 Battery Clip, 793 Coil Contact Pin
When using Clamp Adapter, read its instruction manual carefully.
Threshold Level
between 10
Ω
and 200
Ω
Response Time
32ms
13. Continuity ( )
Turns the power on and selects measurement functions. After measurement, turn it to
"OFF"
.
4-3. Select Key
Use this Key to select sub-measurement functions.
4-2. FUNCTION Switch
Press this key for 1 second or more to turn on the LCD backlight. Press for 1 second or more
again, backlight is turned off.
4-4.
Key
4-6. CYLINDER Key
4-8.
±
TRIGGER Key
Change
＋
/
−
Trigger slopes in Duty Cycle and Injection Pulse Width measurements. (Refer to 6-2).
4-5.
Key
4-7. Hold Key
：
Display Hold
Use this key to select the engine strokes in IP-RPM and IG-RPM measurements: Four-
stroke / Two-stroke / Two-stroke, 2-cylinder simultaneous ignition.
Use this Key to set number of cylinders in Dwell Angle and IG-RPM measurements.
Holds displayed value on LCD by pressing this Key. ("
" lights up).
To release it
：
Press
Hold
Key again.
FREQUENCY MEASUREMENT ( Hz )
(1)
(2)
(3)
Press
Select
Key during voltage measurement. "Hz" lights up on LCD and Frequency
of the measuring voltage is displayed.
Press
Select
Key again to return to voltage measurement.
In Frequency measurement, input sensitivity can be changed in the following procedures.
a.
b.
c.
Press
Level
Key during frequency measurement. Input sensitivity level is changed
as Level 1 (6V)
→
2 (60V)
→
3 (600V)
→
4 (1000V). (default setting is Level 1 (6V)).
Sensitivity level is shown with the number of " " under the bar graph.
Change of input sensitivity is effective in the following cases.
When measured value is unstable, reduce the current input sensitivity level.
When measured value is "0", increase the current input sensitivity level.
( mV /
〜
mV )
1
．
2
．
3
．
4
．
5
．
6
．
Insert black test lead to
COM
terminal, and insert red test lead to
RPM/Temp
＋
/
Ω
/V/
terminal.
Set
FUNCTION
Switch to " ".
Press
Select
Key to select DC ( ) or AC ( )
NOTE
：
Display shows " mV
→〜
mV
→°
C
→°
F " each time the
Select
Key is pressed.
Connect black test lead to
−
(earth) side of the circuit being measured and connect red
test lead to
＋
(positive) side.
NOTE :
Connect the instrument
IN PARALLEL
to the circuit.
NOTE :
Use alligator clips for dangerous voltage measurement.
Read the measurement value on LCD.
After finishing the measurement, set
FUNCTION
Switch to
"OFF"
.
〜
Do not measure voltage in " " position. This will cause electrical shock
hazard to the operator and/or damage to the instrument.
Be careful not to drop off the instrument and test leads into the engine room.
Ignition system generates high voltage that could cause an electrical shock hazard.
Stop the engine when connecting or removing the test leads.
Read "
3. SAFETY PRECAUTIONS
" carefully before measurement.
●
●
●
●
WARNING
5-3. RPM MEASUREMENT (IG-RPM)
※
measuring RPM with test lead
％
-ms
IG-RPM
Stop the engine.
Insert black test lead to
COM
terminal, and insert red test lead to
RPM/Temp
＋
/
Ω
/V/
terminal.
Set
FUNCTION
Switch to " ", and press
Select
Key until "RPM" appears
on LCD.
％
-ms
IG-RPM
1
．
2
．
3
．
4-9. Range Key
Use this Key to change Auto or Manual-ranging (Refer to 6-1).
3-2. PREVENTION OF FAILURE
Maximum Input
600mV AC/DC
1000V AC/DC
6.000 V
60.00 V
600.0 V
1000 V
±
2.0
％
rdg
±
5dgt
±
2.2
％
rdg
±
5dgt
Range
60.00 mV
600.0 mV
≒
10M
Ω
,
50pF
600Vrms
Resolution
0.01 mV
0.1 mV
Input
Impedance
Overload
Protection
≒
10M
Ω
,
50pF
1050Vrms
1450Vpeak
Maximum Input
600mV AC/DC
1000V AC/DC
Accuracy
±
2.0
％
rdg
±
5dgt
1 mV
10 mV
100 mV
1 V
60.00 mA
600.0 mA
6.000 mA
10.00 mA
Range
600.0
μ
A
6000
μ
A
0.25mV
／
μ
A
0.63A
／
500V
Fuse
Resolution
0.1
μ
A
1
μ
A
Burden Voltage
Overload
Protection
Maximum Input
6000
μ
A AC/DC
0.01 mA
0.1 mA
1 mA
10 mA
Accuracy
±
0.7
％
rdg
±
3dgt
±
0.5
％
rdg
±
3dgt
±
0.7
％
rdg
±
3dgt
±
0.5
％
rdg
±
3dgt
±
0.7
％
rdg
±
3dgt
±
0.5
％
rdg
±
3dgt
2.5mV
／
mA
0.63A
／
500V
Fuse
600mA AC/DC
0.03V
／
A
6.3A
／
500V
Fuse
6A AC/DC
60.00 mA
600.0 mA
6.000 mA
10.00 mA
Range
600.0
μ
A
6000
μ
A
0.25mV
／
μ
A
0.63A
／
500V
Fuse
Resolution
0.1
μ
A
1
μ
A
Burden Voltage
Overload
Protection
Maximum Input
6000
μ
A AC/DC
0.01 mA
0.1 mA
1 mA
10 mA
Accuracy
±
2.2
％
rdg
±
5dgt
±
2.0
％
rdg
±
5dgt
±
2.2
％
rdg
±
5dgt
±
2.0
％
rdg
±
5dgt
±
2.2
％
rdg
±
5dgt
±
1.2
％
rdg
±
5dgt
2.5mV
／
mA
0.63A
／
500V
Fuse
600mA AC/DC
0.03V
／
A
6.3A
／
500V
Fuse
6A AC/DC
600Vrms
Overload Protection
6553 count max.
Display
600Vrms
Overload
Protection
Resolution
1
°
C
1
°
F
600Vrms
Overload Protection
600Vrms
Overload Protection
Resolution
0.001
μ
F
0.01
μ
F
0.1
μ
F
1μ
F
600Vrms
Overload Protection
