【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. Afterreading it, keep it together with the product for reference to it whennecessary.
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 tothe product is as follows.
: Very important instruction for safe use.
∙∙ The warning messages are intended to prevent accidents tooperating personnel such as burn and electrical shock.
∙∙ The caution messages are intended to prevent damage tothe instrument.
: Voltage: Glaund: AC Voltage＋ : Plus input
Ω : Resistance− : Minus input: Fuse & Diode protection: Fuse: Drop proof

SP20

1-2 Warning Instruction for safe use
WARNING

MULTITESTERTo 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 33Vrms (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 withequipment (i.e. motors) that generates induced or surge
voltage since it may exceed the maximum allowable voltage.

Dempa Bldg., 4-4 Sotokanda 2-Chome
Chiyoda-Ku, Tokyo, Japan

INSTRUCTION MANUAL【2】APPLICATION AND FEATURES
2-1 Application
This instrument is portable multimeter designated formeasurement of weak current circuit.
2-2 Features∙∙ Taut-band structure is adopted in the meter part.
∙∙ A stand is equipped.

Meter cover

PointerWARNING
1. Never use meter if the meter or test leads are damaged orbroken.
2. Make sure that the test leads are not cut or otherwise damaged.

Panel0 Ω・adjuster

Main unit and test
leads damaged?

＋input terminal
No damaged

Range selector－input terminal

DamagedPointor swing at right?

DC 1000 V, AC 750 V orPEAK MAX 1100 V＋,−Full scale value
at the ranges✽ DC, AC 0.5 A✽ DC, AC 1 mA
Voltage and current
input prohibited
DC 2 VΩ1.5✽ DC, AC 200 V or
PEAK MAX 250 V✽ DC, AC 200 V or
PEAK MAX 250 V

Note: AC voltage is regulated by rms value of sinusoidal wave.
“ ✽ ” is within 5 second.

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 ofa meter moves to a considerable extent. However, select themaximum range and measure in case the extent of value to bemeasured can not be predicted.
② Appropriate range for measuring a resistance (Ω) , select therange that the pointer indicates approximately in the center.

NoYes

Test lead (Black)②Short the red andblack test pins.

Test pin

Maximum overload
protection input

WARNING
1. Never apply an input signals exceeding the maximum rating
input value.
2. Be sure to disconnect the test pins from the circuit whenchanging the function.
3. Select the maximum range and measure in case the extent ofvalue to be measured can not be predicted.
4. Always keep your fingers behind the finger guards on theprobe when making measurements.

Stop using it andhave it repaired.

①Set the range selector
knob at Ω ranges.

Maximum rating
input value

4-4 Voltage Measurement

Check continuity oftest leads and fuse.

Test lead (Red)DCV 50 〜 500
ACV 50 〜 500
DCV 0.25 〜 10
ACV 10
DCA 2.5 m/25 m/0.25
DCA 50 μ

Input

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.

STARTZero position
adjuster

Function (Range)- 2 -4-1 Start-up Inspection
Scale

1-3 Maximum Overload Protection Input- 1 -【4】MEASUREMENT PROCEDURE【3】NAME OF COMPONENT UNITS

5. Never use meter if the meter or test leads are damaged orbroken.
6. Never use uncased meter.
7. Be sure to use a fuse of the specified rating or type. Neveruse a substitute of the fuse or never make a short circuit ofthe fuse.
8. Always keep your fingers behind the finger guards on theprobe when making measurements.
9. Be sure to disconnect the test pins from the circuit whenchanging 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 orfuse. Do not attempt any alteration of original specifications.
12. To ensure safety and maintain accuracy, calibrate and checkthe tester at least once a year.
13. Indoor use.

No problem. Start
measurement.

Replace the battery
and fuse. and startingto ① once more.

4-4-1 DCV Measurement ( ) Maximum rating input value500 VDC
1) ApplicationsMeasures batteries and d. c. circuits.
2) Measuring ranges
0.25/2.5/5/10/50/100 (6ranges)

PlugBattery

Test lead (TL-61)- 3 -- 4 -4-4-2 ACV Measurement ( 〜 ) Maximum rating input value500 VAC① Connect the black plug of the test lead to the −input terminal andthe 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 thecircuit 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.

① Connect the black plug of the test lead to the −input terminal andthe 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 thecircuit to measure and the red test pin to the positive potentialside.
④ Read the move of the pointer by V. A scale.
⑤ After measurement, remove the red and black test pins from thecircuit measured.

- 5 -Resistance

WARNING
Never apply voltage to the input terminals.
) Maximum rating input value0.25 ADC
WARNING
1. Never apply voltage tothe input terminals.
2. Be sure to make aseries connection via
load. (Please see toabove drawing)
3. Do not apply an input
exceeding themaximum rated current
to the input terminals.

PowerPowerLoadLoad（×）（○）① Connect the black plug of the test lead to the −input terminal andthe 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 sothat 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 theresistor measured.
Note : Be sure to use the same rated fuse. In case a fuse other than thesame rated one (see "SPECIFICATIONS") is used, error inindication occurs and/or circuit protection is made unable.

- 7 -<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.

Fuse

WARNING
Never apply an input signals exceeding the battery voltage
to the input terminals.
① Connect the black plug of the test lead to the −input terminal andthe 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)
WARNING
1. Never apply voltage to the input terminals.
2. Do not measure as for a condenser of a charged condition.
① Connect the black plug of the test lead to the −input terminal andthe 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 sothat 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.

- 8 -5-3 How to Replace Battery and Fuse
WARNING
1. If the rear case or the battery lid is removed with input applied tothe 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 andperformance of tester.
3. When operator remove the battery lid, do not touch the internal
parts or wire with hand.

5-4 Storage

CAUTION
1. The panel and the case are not resistant to volatile solvent andmust 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 theinstrument near heat-generating devices (such as a solderingiron).
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 orplaces under direct sunlight or where condensation is anticipated.

Following the above instructions, store the instrument in goodenvironment.

Screw【6】AFTER-SALE SERVICE

Battery lid

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.

Battery<How to replace the fuse>
Fuse of the specified rating and type
0.5 A/250 V φ 6.3×30 mm Blowout capacity:500 A

Resistance

4-7 Battery check

Battery

4-6 Resistance Measurement (Ω)

4-5 DCA Measurement (Caution : If the pointer fails toswing up to 0 Ωeven when the 0 Ωadjuster is turned
clockwise fully,
replace the internal
battery with a freshone.

- 6 -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 arenormal.
● Please use spare fuse of a battery lid back side.

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.

- 11 -- 12 -

4-9 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 thenconnect the red plug.
④ Connect the measuring pin to a point to be measured. Read thevalue on ℃ scale when the pointer is stabilized.
4-10 End of Measurement
Turn off the range to prevent voltage applied to resistance andcurrent ranges.

【5】MAINTENANCEWARNING
1. This section is very important for safety. Read and understandthe following instruction fully and maintain your instrument
properly.
2. The instrument must be calibrated and inspected at least once ayear to maintain the safety and accuracy.
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 andhave 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.

- 10 -- 9 -【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 gAccessories : Instruction manual 1 Spare fuse 1Test leads (TL-61)17-2 Optional Accessories• Clip adapter CL-14 (Red, Black 1 set)
• 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.
Functionfull scale value
0.25/2.5/5/10/50/100
500Accuracy
Remarks±3 % against Input impedance 20 kΩ/Vfull scale
input impedance 9 kΩ/VACV(〜)

10/50/250/500

Input impedance 9 kΩ/V
±3 % against Frecquency:40 Hz 〜 100 kHz
full scale(AC 10 V range ±3 %)DCA( )

50 μ/2.5 m/25 m/0.25

Ω

2 k/20 k/ 200 k/ 2 M(×1)(×10)(×100)(×1 k)

DCV( )

BatteryCheck±3 % against Voltage drop 0.25 V
Not including thefull scale
resistance of the fuseCenter value 20 Ω
±3 % of arc Max. Value 2 kΩRelease voltage 3 V

2.0 V―――

Load resistance 20 Ω

Capacity
500(μF)―――

Pointer indication of
the maximum moveby charged current in
the capacitor.

Temp ℃ −20 〜＋ 200±3 % against
Optional THP
full scale

Specifications and external appearance of the product describedabove may be revised for modification without prior notice.

- 13 -- 14 -