Dempa Bldg., 4-4 Sotokanda 2-Chome
Chiyoda-Ku, Tokyo, Japan
INSTRUCTION MANUAL
SP20
MULTITESTER
START
Main unit and test
leads damaged?
Check continuity of
test leads and fuse.
S t o p u s i n g i t a n d
have it repaired.
No damaged
Damaged
No
Yes
①
Set the range selector
knob at Ω ranges.
②
Short the red and
black test pins.
No problem. Start
measurement.
Pointor swing at right?
Replace the battery
and fuse. and starting
to
①
once more.
Meter cover
Panel
Pointer
Scale
＋
input terminal
Range selector
Zero position
adjuster
－
input terminal
0 Ω
・
adjuster
Test lead (Red)
Test pin
Plug
Test lead (Black)
Test lead (TL-61)
Battery
Resistance
Resistance
Battery
Battery lid
Screw
Fuse
（○）
（×）
Power
Load
Power
Load
【
1
】
SAFETY PRECAUTIONS : Before use, read the following safety precautions
This instruction manual explains how to use your multitester
SP20 safely. Before use, please read this manual thoroughly. After
reading it, keep it together with the product for reference to it when
necessary.
The instruction given under the heading “
WARNING
” “
CAUTION
”
must be followed to prevent accidental burn or electrical shock.
1-1 Explanation of Warning Symbols
The meaning of the symbols used in this manual and attached to
the product is as follows.
: Very important instruction for safe use.
∙The warning messages are intended to prevent accidents to
operating personnel such as burn and electrical shock.
∙The caution messages are intended to prevent damage to
the instrument.
: Voltage
: Glaund
: AC Voltage
＋
: Plus input
Ω : Resistance
−
: Minus input
: Fuse & Diode protection
: Fuse
: Drop proof
1-2 Warning Instruction for safe use
To ensure that the meter is used safely, be sure to observe
the instruction when using the instrument.
1. Never use meter on the electric circuit that exceed 3 kVA.
2. Pay special attention when measuring the voltage of AC 33
Vrms (46.7 Vpeak) or DC 70 V or more to avoid injury.
3. Never apply an input signals exceeding the maximum rating
input value.
4. Never use meter for measuring the line connected with
equipment (i.e. motors) that generates induced or surge
voltage since it may exceed the maximum allowable voltage.
WARNING
5. Never use meter if the meter or test leads are damaged or
broken.
6. Never use uncased meter.
7. Be sure to use a fuse of the specified rating or type. Never
use a substitute of the fuse or never make a short circuit of
the fuse.
8. Always keep your fingers behind the finger guards on the
probe when making measurements.
9. Be sure to disconnect the test pins from the circuit when
changing the function or range.
10. Never use meter with wet hands or in a damp environment.
11. Never open tester case except when replacing batteries or
fuse. Do not attempt any alteration of original specifications.
12. To ensure safety and maintain accuracy, calibrate and check
the tester at least once a year.
13. Indoor use.
1-3 Maximum Overload Protection Input
Function (Range)
Input
Maximum rating
input value
Maximum overload
protection input
DCV 50
〜
500
＋
, −
Full scale value
at the ranges
DC 1000 V, AC 750 V or
PEAK MAX 1100 V
ACV 50
〜
500
DCV 0.25
〜
10
✽
DC, AC 200 V or
PEAK MAX 250 V
ACV 10
DCA 2.5 m/25 m/0.25
✽
DC, AC 0.5 A
DCA 50 μ
✽
DC, AC 1 mA
Ω
Voltage and current
input prohibited
✽
DC, AC 200 V or
PEAK MAX 250 V
1.5
DC 2 V
Note: AC voltage is regulated by rms value of sinusoidal wave.
“
✽
” is within 5 second.
【
2
】
APPLICATION AND FEATURES
2-1 Application
This instrument is portable multimeter designated for
measurement of weak current circuit.
2-2 Features
∙Taut-band structure is adopted in the meter part.
∙A stand is equipped.
【
3
】
NAME OF COMPONENT UNITS
【
4
】
MEASUREMENT PROCEDURE
4-1 Start-up Inspection
4-2 How to Set up Range (Selection of appropriate range)
①
When determining a measuring range, select a higher voltage
than the value to be measured as well as where the pointer of
a meter moves to a considerable extent. However, select the
maximum range and measure in case the extent of value to be
measured can not be predicted.
②
Appropriate range for measuring a resistance (Ω) , select the
range that the pointer indicates approximately in the center.
4-3 Preparation for Measurement
Turn the zero position adjuster so that the pointer may align left
to zero position. Select a range proper for the item to be measured
and set the range selector accordingly.
4-4 Voltage Measurement
4-4-1 DCV Measurement ( ) Maximum rating input value500 VDC
1) Applications
Measures batteries and d. c. circuits.
2) Measuring ranges
0.25/2.5/5/10/50/100 (6ranges)
1. Never use meter if the meter or test leads are damaged or
broken.
2. Make sure that the test leads are not cut or otherwise damaged.
WARNING
1. Never apply an input signals exceeding the maximum rating
input value.
2. Be sure to disconnect the test pins from the circuit when
changing the function.
3. Select the maximum range and measure in case the extent of
value to be measured can not be predicted.
4. Always keep your fingers behind the finger guards on the
probe when making measurements.
WARNING
Battery
4-4-2 ACV Measurement (
〜
) Maximum rating input value500 VAC
①
Connect the black plug of the test lead to the −input terminal and
the red plug to the
＋
input terminal.
②
Set the range selector knob to an appropriate ACV range.
③
Apply the red and black test pin to measured circuit.
④
Read the move of the pointer by V. A scale.
⑤
After measurement, remove the red and black test pins from the
circuit measured.
• Since this instrument adopts the mean value system for its AC
voltage measurement circuit, AC waveform other than sine wave
may cause error.
• Errors occur under such frequencies other than specified
specification.
4-5 DCA Measurement ( ) Maximum rating input value0.25 ADC
①
Connect the black plug of the test lead to the −input terminal and
the red plug to the
＋
input terminal.
②
Set the range selector knob to an appropriate DCA range.
③
Apply the black test pin to the negative potential side of the
circuit to measure and the red test pin to the positive potential
side.
④
Read the move of the pointer by V. A scale.
⑤
After measurement, remove the red and black test pins from the
circuit measured.
4-6 Resistance Measurement (Ω)
①
Connect the black plug of the test lead to the −input terminal and
the red plug to the
＋
input terminal.
②
Set the range selector knob to an appropriate Ω range.
③
Short the red and black test pins and turn the 0 Ω adjuster so
that the pointer may align exactly to 0 Ω.
④
Apply the black and red test pin to the measured resistance.
⑤
Read the move of the pointer by Ω scale.
⑥
After measurement, remove the red and black test pins from the
resistor measured.
Note : Be sure to use the same rated fuse. In case a fuse other than the
same rated one (see "SPECIFICATIONS") is used, error in
indication occurs and/or circuit protection is made unable.
Caution : If the pointer fails to
swing up to 0 Ω
even when the 0 Ω
adjuster is turned
clockwise fully,
replace the internal
battery with a fresh
one.
4-7 Battery check
①
Connect the black plug of the test lead to the −input terminal and
the red plug to the
＋
input terminal.
②
Set the range selector knob to an appropriate
1.5V
or
1.5V
range.
③
Apply the black test pin to the negative potential side of the circuit
to measure and the red test pin to the positive potential side.
④
Read the move of the pointer by
1.5V
.
4-8 Measuring Capacity (μF)
①
Connect the black plug of the test lead to the −input terminal and
the red plug to the
＋
input terminal.
②
Set the range selector knob to an appropriate μF×1 range.
③
Short the red and black test pins and turn the 0 Ω adjuster so
that the pointer may align exactly to 0 Ω.
④
Apply the black and red test pin to the measured capacitor.
⑤
The pointer moves full scale by the charge current to the capacitor.
However, the point starts gradual returning from a certain point.
Read the indicated maximum value on μF scale.
4-9 DC High Voltage measurement (Optional HV Probe)
①
Connect the black plug of the HV probe to the −input terminal and
the red plug to the
＋
input terminal.
②
Set the range selector knob to HV PROBE range.
③
First, connect the clip (black) of the probe to the earth line (−) in
the circuit to be measured, and then apply the measuring pin on
the probe body to your measuring point.
④
Read the move of the pointer by V. A scale, measured value in
terms of kV.
4-10 Optional Temperature Probe (T-THP) Max value +200
℃
①
Connect the pin of the temperature probe to the
＋
input terminal
and the black plug to the −terminal.
②
Set the range selector to
℃
PROBE range.
③
Adjust the pointer to the 0 Ω by the range selector. Remove
the pin of the temperature probe from the
＋
terminal and then
connect the red plug.
④
Connect the measuring pin to a point to be measured. Read the
value on
℃
scale when the pointer is stabilized.
4-11 End of Measurement
Turn off the range to prevent voltage applied to resistance and
current ranges.
【
5
】
MAINTENANCE
1. Never apply voltage to
the input terminals.
2. Be sure to make a
series connection via
load. (Please see to
above drawing)
3. Do not apply an input
exceeding the
maximum rated current
to the input terminals.
WARNING
Never apply voltage to the input terminals.
WARNING
Never apply an input signals exceeding the battery voltage
to the input terminals.
The probe is designed for the measurement of very small direct
current circuit. Never use the probe to measure high voltage in
power lines, such as transmission and distribution lines ; it is
very dangerous.
WARNING
WARNING
1. Never apply voltage to the input terminals.
2. Do not measure as for a condenser of a charged condition.
1. This section is very important for safety. Read and understand
the following instruction fully and maintain your instrument
properly.
2. The instrument must be calibrated and inspected at least once a
year to maintain the safety and accuracy.
1. If the rear case or the battery lid is removed with input applied to
the input terminals, you may get electrical shock. Before starting
the work, always make sure that no input is applied.
2. Be sure to use the fuse is same rating so as to ensure safety and
performance of tester.
3. When operator remove the battery lid, do not touch the internal
parts or wire with hand.
1. The panel and the case are not resistant to volatile solvent and
must not be cleaned with thinner or alcohol.
For cleaning, use dry, soft cloth and wipe it lightly.
2. The panel and the case are not resistant to heat. Do not place the
instrument near heat-generating devices (such as a soldering
iron).
3. Do not store the instrument in a place where it may be subjected
to vibration or from where it may fall.
4. For storing the instument, avoid hot, cold or humid places or
places under direct sunlight or where condensation is anticipated.
WARNING
WARNING
WARNING
CAUTION
5-1 Maintenance and Inspection
1. Appearance
• Is the appearance not damaged by falling?
2. Test leads and fuse
• Is the cord of the test leads not damaged?
• Is the core wire not exposed at any place of the test leads?
If your instrument falls in any of the above items, do not use it and
have it repaired or replace it with a new one.
●
Make sure that the test leads are not cut.
5-2 Calibration
The calibration and inspection may be conducted by the dealer.
For more information, please contact the dealer.
5-3 How to Replace Battery and Fuse
<How to replace the battery>
①
Remove the battery lid screw with a screwdriver.
②
Remove the battery lid.
③
Take out the battery and replace it with a new one.
④
Attach the battery lid and fix it with the screw.
<How to replace the fuse>
①
Remove the battery lid screw with a screwdriver.
②
Pull out the fuse out of holder on the circuit board and replace it.
③
Put back the battery lid where it was and tighten the screw.
④
Check and see whether or not indications of respective ranges are
normal.
●
Please use spare fuse of a battery lid back side.
5-4 Storage
Following the above instructions, store the instrument in good
environment.
【
6
】
AFTER-SALE SERVICE
6-1 Repair
If the multimeter fails during use, check the following items before
sending it for repair.
• Is the battery not exhausted?
• Are the test leads not disconnected?
• Is the fuse not blown?
We repair defective product at any cost. When mailing it to us for repair,
do not use the same cardboard box in which it was delivered to you
because it may receive damage in trasit. Please send it in a box at least
five times as large as the original box with enough cushioning material
stuffed around it.
6-2 For Information or Enquiries
If you need information regarding purchase of repair parts or if you
have any other sales related questions, please contact the dealer, selling
agent, or maker.
【
7
】
SPECIFICATIONS
7-1 General Specifications
AC Rectifier Form
: Half-wave rectifier form
Meter type
: Internal magnet type, Taut band meter
Accuracy Assurance Temperature/Humidity Range
: 21
〜
25
℃
75 %RH max. No condensation
Operating Temperature/Humidity Range
: 3
〜
43
℃
80 %RH max. No condensation
Storage temperature/Humidity Range
: −10
〜
50
℃
70 %RH max. No condensation
Internal Battery : R6 (IEC) or UM-3 1.5 V×2
internal fuse :
φ
6.3×30 mm 0.5 A/250 V Fast fuse
Blowout capacity 500 A
Dimension and Mass
: 144(
H)×99(W)×41(D)mm
・
approx. 270 g
Accessories : Instruction manual 1 Spare fuse 1
Test leads (TL-61)1
7-2 Optional Accessories
• Clip adapter CL-14 (Red, Black 1 set)
• HV probe
HV-10
• Carrying Case C-SP
• Carrying Case C-SPH
• Clip adapter TL-9IC
7-3 Measurement Range and Accuracy
Accuracyassurance range : 23
℃
±2
℃
45
〜
75 %RH max.
No condensation
Attitude
: Horizontal (± 5 °)
ACV accuracy in the case of sine wave AC.
Function
full scale value
Accuracy
Remarks
DCV
(
)
0.25/2.5/5/10/50/100
±3 % against
full scale
Input impedance 20 kΩ/V
500
input impedance 9 kΩ/V
ACV
(
〜
)
10/50/250/500
±3 % against
full scale
Input impedance 9 kΩ/V
Frecquency
:40 Hz
〜
100 kHz
(AC 10 V range ±3 %)
DCA
(
)
50 μ/2.5 m/25 m/0.25
±3 % against
full scale
Voltage drop 0.25 V
Not including the
resistance of the fuse
Ω
2 k/20 k/ 200 k/ 2 M
(×1)(×10)(×100)(×1 k)
±3 % of arc
Center value 20 Ω
Max. Value 2 kΩ
Release voltage 3 V
Battery
Check
2.0 V
―――
Load resistance 20 Ω
Capacity
(μF)
500
―――
Pointer indication of
the maximum move
by charged current in
the capacitor.
HV
DC 25 kV
±20 % with
probe
Optional HV-10
Temp
℃
−20
〜＋
200
±3 % against
full scale
Optional THP
Specifications and external appearance of the product described
above may be revised for modification without prior notice.
Fuse of the specified rating and type
0.5 A/250 V
φ
6.3×30 mm Blowout capacity:500 A
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