EM7000
FET電子テスタ

FET MULTITESTER

取扱説明書

INSTRUCTION MANUALCONTENTS[1] SAFETY PRECAUTIONS:Before use, read the following safety precautions ……029
1-1 Warning and Caution Instruction for Safe Use …………029
1-2 Explanation of Warning Symbols …………………………030
1-3 Overload Protections ………………………………………031[2] APPLICATIONS AND FEATURES …………………………032
2-1 Applications …………………………………………………032
2-2 Features ……………………………………………………032[3] NAME OF FUNCTIONS ………………………………………032[4] SCALE READING ……………………………………………033[5] DESCRIPTION OF FUNCTIONS ……………………………034
5-1 Switches and Adjusters ……………………………………034
5-2 How to Use the Stand ……………………………………034
5-3 Time to Replace Internal Batteries ………………………034[6] MEASURING PROCEDURE …………………………………035
6-1 Start -up Inspection…………………………………………035
6-2 How to select an appropriate range ………………………035(Selection of an appropriate range)
6-3 Preparation for Measurement ……………………………035
6-4 Voltage Measurement ……………………………………037
6-4-1 DCV (DCV
) …………………………………………037
6-4-2 ±DCV (±DCV) ………………………………………038
6-4-3 ACV (ACVrms) ……………………………………039
6-4-4 ACV (ACVp-p)………………………………………041
6-5 AF Output (dB) Measurement ……………………………042
6-6 Current Measurement ……………………………………044
6-6-1 DCA (DCA
) …………………………………………044
6-6-2 ±DCA (±DCA) ………………………………………045
6-6-3 DCA (DC 6 A) …………………………………………046
6-6-4 ACA (AC 6 A)……………………………………………047
6-7 Resistance ( Ω ) Measurement ……………………………048

6-8 DC High Voltage (HV) Measurement ……………………049
6-9 End of Measurement ………………………………………050[7] MAINTENANCE ………………………………………………051
7-1 Maintenance and Inspection ………………………………051
7-2 Calibration …………………………………………………051
7-3 How to Replace Built in Battery and Fuse ………………051
7-4 Cleaning and Storage………………………………………053[8] SPECIFICATIONS ……………………………………………053
8-1 General Specification ………………………………………053
8-2 Optional Accessories ………………………………………054
8-3 Measurement Range and Accuracy………………………055[9] AFTER-SALES SERVICE ……………………………………057
9-1 Warranty and Provision ……………………………………057
9-2 Repair ………………………………………………………057
9-3 SANWA web site……………………………………………058

[1] SAFETY PRECAUTIONS:Before use, read the following safety precautions
This instruction manual explains how to use your FET multitester
EM7000, safely.
Before use, please read this manual thoroughly, after reading it,
keep it together with the product for reference to it when necessary.
“ CAUTION”
The instruction given under the heading“ WARNING”
must be followed to prevent accidental burn or electrical shock.
1-1 Warning and Caution Instruction for Safe Use

WARNINGTo ensure that the meter is used safely, be sure to observe theinstruction when using the instrument.
1. Never use the meter on the electric circuits that exceed 6 kVA.
2. Pay special attention when measuring the voltage of AC 33 V rms(46.7 V peak) or DC 70 V or more to avoid injury.
3. Never apply an input signals exceeding the maximum rating input
value.
4. Never use the meter for measuring the line connected withequipment (i.e. motors) that generates induced or surge voltage
since it may exceed the maximum allowable voltage.
5. Never use the 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 asubstitute of the fuse or never make a short circuit of the fuse.
8. Always keep your fingers behind the finger guards on the leads
when making measurements.
9. Be sure to disconnect the test pins from the circuit when changing
the function or range.
10. Before starting measurement, make sure that the function andrange are properly set in accordance with the measurement.
11. Never use the meter with wet hands or in a damp environment.
12. Never open rear case except when replacing batteries or fuse.
13. Do not attempt any alteration of original specifications.
14. To ensure safety and maintain accuracy, calibrate and check themeter at least once a year.
15. Indoor use.
— 29 —

CAUTION
1. The use of this unit in a way other than the description in the
instruction manual may void the protection given to this unit.
2. Please note the use of this unit in the environment where afrequency over several tens of kHz and a strong
electromagnetic field exist could cause a malfunction. Takecare when using this unit.
3. Because the instrument is super-sensitive, the meter may
move by just connecting test leads, but it is not failure of the
instrument.
4. It may malfunction when measuring voltage/current in the
inverter circuit.
1-2 Explanation of Warning Symbols
The meanings of the symbols used in this manual and attached tothe product are 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 to the
instrument.
p-p : peak to peak
: DC
: AC
: zero-center meterΩ : Resistance: Double insulation＋ : Plus－ : Minus: Fuse and Diode Protection∞ : Infinity: Ground: High Voltage, risk of electric shock: Fuse— 30 —

1-3 Overload Protections
Input terminals (*1) Maximum overload protection input
Functions
DCV 1000
DC • AC 1000 V or peak max 1400 V
ACV 750
1.2/3/12/30
DC • AC 240 V or peak max 340 V
DCV
ACV 120/300
DC • AC 750 V or peak max 1100 V
COM • V •A •Ω
DCV 0.3+ DC • AC 50 V or peak max 70 V–
0.12 µDC • AC 10 mA
DCA 0.3 m/3 m(*2) DC • AC 100 Vor peak max 140 V
DC • AC 500 mA
30 m/300 m(*2, *3) DC • AC 50 V or peak max 70 V
Ω x1～x100 k
DCA 6
COM • DC 6 A (*4) DC • AC 20 A
– AC 6 A
ACA 6*1. The application time of the maximum overload protection input
value is within 5 seconds.
Also, the input waveform of AC voltage is a sine wave.
*2. The circuits are protected with a fuse (500 mA) and a diode if
overload input is voltage.
*3. The circuits are protected with a fuse (500 mA) and a diode if
overload input is voltage. However, the resistors could be burnt
depending on the input timing of input waveforms (or polarity inthe case of direct current).
*4. The circuits are protected with a fuse (6.3 A) against theoverload input.

— 31 —

[2] APPLICATION AND FEATURES

2-1 Applications
This unit is a highly sensitive tester designed for measuring electric circuits
having a small capacity. It can measure voltages at various areas ofcompact communication equipment and household electric appliances,
voltages of lamp lines and various batteries, and micro current in the mAclass.
2-2 Features
This unit is a highly sensitive “FET electronic tester” having the DC
voltage function of which the internal resistance is as high as 2.5 to 12
MΩ, and also the DC current function with the 0.12 µA range.
The zero center meter (NULL meter) function facilitates measurementof ± DC voltage and ± DC current.
The frequency characteristic of AC low voltage ranges (3 V and 12 V
ranges) is 40 Hz-1 MHz. The Vp-p value of triangular-wave, squarewave over 20 % duty cycle voltages of waveforms can also bemeasured at 3 V range.

[3] NAME OF FUNCTIONS
Meter coverScale

0 Ω adjuster (0 Ω ADJ)

Pointer
Mechanical zero position
adjusterElectrical zero meter
adjuster (ZERO ADJ)

Function/Range selector

Power ON indicator

DC 6 A+/AC 6 A~ input
terminal

Power switch–COM input terminal

Stand

Panel
Rear case
Removable
test pincovers+ input terminal
Test
pins
FingerguardsTest probe (red)When not covered Plugs

Test lead (TL-21a)— 32 —

Test probe (black)[4] SCALE READING
�
�

b
r

�
�

�

�

�
�

�

Range
Ω X 100 kΩ X 10 kΩX1k
�Ω X 100Ω X 10ΩX1
DCV 300
DCV 30DCV 3* DCV 0.3
� DCA 300 m
DCA 30 m
DCA 3 m
DCA 0.3 m

Multiplier
X 100 kX 10 k
X1k
X 100
X 10
X1
X 10
X1
X 0.1
X 0.01
X 10
X1
X 0.1
X 0.01Range
ACV 300*
� ACV 30
ACV 3
DCV 1000
DCV 120
DCV 12* DCV 1.2
� DCA 0.12 µ
ACV 750
ACV 120
ACV 12
ACV (P-P) 840
� ACV (P-P) 84
ACV (P-P) 8.4

Multiplier
X 10
X1
X 0.1
X 10
X1
X 0.1
X 0.01
X 0.001
X 10
X1
X 0.1
X 100
X 10
X1

* The DCV and DCA functions use black scale lines (B),and the ACV (rms) function uses red scale lines (R).
The scale figures are common to the DCV and ACV(rms) functions. The ACV (p-p) function uses exclusive
red scal liens and scale figures � , � .

Range
ACV (P-P) 330
�
ACV (P-P) 33± DCV 150
± DCV 15
± DCV 1.5
± DCV 0.15
�
± DCA 150 m± DCA 15 m
± DCA 1.5 m± DCA 0.15 m± DCV 600
± DCV 60
� ± DCV 6± DCV 0.6
± DCA 0.06 µ
� ± ACA 6
� 11 dB

Multiplier
X 10
X1
X 10
X1
X 0.1
X 0.01
X 10
X1
X 0.1
X 0.01
X 100
X 10
X1
X 0.1
X 0.01
X1
X1

Examples in a figure pointer place.
FunctionΩ
DCV
ACV (rms)
ACV (P-P)
±DCA

Range
X 100
120 V
300 V
840 V
±1.5 mScale No.
�
and �
and �
�
�

— 33 —

Conversion
60X10030X1
8.5X102.4X100–7.5X0.1

Reading
6000 Ω (6 kΩ)
30 V
85 V
240 V P-P
–0.75 ｍA

[5] DESCRIPTION OF FUNCTIONS

5-1 Switches and Adjusters
 Function/Range selector
Selecting the desired function or range.
 Mechanical zero meter adjuster
Adjusting zero position by turning it with a screwdriver (see the figure at thebottom on the next page. At this time, the power switch must be kept OFF.
 Power switch and power ON indicator lamp
Sliding the switch upward (ON direction) turns on the power andthe power ON indicator lamp blinks, indicating that the unit isready to be operated.
Sliding the switch downward (OFF direction) turns off the power
and the power ON indicator lamp goes off.
Be sure to turn off the power switch after use, as the built-in
batteries are consumed.
 Electrical zero meter adjuster (ZERO ADJ) : Operates with layerbuilt cell (6F22)
Operate this adjuster after the mechanical zero meter adjustment
and turning on the power switch.
• In the measurement of ±DC voltage (±DCV) and ±DC current(±DCA), turn on the power switch, and then turn this adjuster to adjust
the pointer to the zero position at the center of ± DCV•A scales.
• In the measurement of the functions other than the above, turn on the
power switch, and then turn this adjuster to adjust the pointer to thezero position.
 0 Ω adjuster (0 Ω ADJ): Operates with model R6P(SUM-3 battery 1.5 V)
Use this for the resistance measurement. Before measurement, turnon the power switch and short-circuit the test pins of test leads andturn this adjuster to adjust the pointer to the 0 Ω position.
5-2 How to Use the Stand
Tilt the stand attached to the rear case as shown in the figure on
the next page.
5-3 Time to Replace Internal Batteries
Model R6P (SUM-3 battery 1.5 V) :When 0 Ω adjustment in the Ω x 1 range cannot be made.
Model 6F22 (layer-built cell 9 V) :When blink interval of ON indicator lamp becomes shorter
than that with a new battery or when continuously lighted.
— 34 —

[6] MEASURING PROCEDURE
6-1 Startup Inspection (See the flowchart on the next page.)

WARNING
1. To prevent an electric shock, do not use the tester if the tester
itself or test leads are damaged.
2. Make sure that the test leads are not broken or the fuses are notblown.
6-2 How to select an appropriate range Voltage (DCV, ±DCV, ACV (rms), ACV (p-p), Current (DCA, ±DCA)
As a rule, select the range whose maximum scale value is larger
than the value to be measured.
For example, when measuring the voltage of 9 V, the measuring
range should not be 3 V range or 30 V range but be 12 V range,
and when measuring 15 V, it should be 30 V range.
 Resistance (Ω)
Select the range in which the pointer indicates the approximate
center of the Ω scales.
6-3 Preparation for Measurement
 If the pointer does not indicate correctly the zero position at the left endof the scale plate, turn the mechanical zero meter adjuster with ascrewdriver to adjust it. (See the figure below.) Connect the test leads to the input terminals, and select the desired
function/range with the function/range selector.
 Turn on the power switch (power ON), and turn the electrical zero
meter adjuster (ZERO ADJ) to adjust the electrical zero meter position.
Adjust the pointer to the zero position at the center of the meter for the±DCV and ±DCA functions, and to the zero position at the left end of
the meter for other functions.
Do not touch the electrical zero meter adjuster during measurement.
How to Use
the StandMechanical zero
position adjustment— 35 —

START

Main unit
and test leads
damaged ?

DamagedNo damaged

Stop using it, andhave it repaired.

Check continuity oftest leads and fuse.
�Connect the black plugof the test lead to the－ terminal.

�Short the red andblack test pins.

�Connect the red plugof the test lead to the＋ terminal.

�Did thepointer move toright side ?

�Set the function/
range selector atΩ x 1 range.

NO

Replace the battery
and fuse, and startingto � once more.

YES
�Set the power switch
to ON position.

No problem.
Start measurement.

�

ON

�

�

x10k

�

�

— 36 —

Stop using it andhave it repaired.

�

6-4 Voltage Measurement

WARNING

1. Do not apply an input that exceeds the maximum rating ofeach range.
2. Do not change over to other function or range during
measurement.
3. Measure in the maximum measuring range if you cannot
estimate a value to measure.
4. Do not hold the test pins on the leading end side from theflanges on the test leads during measurement.
5. Be sure to perform measurement with parallel connection
to the load.

6-4-1 DCV (DCV ) Maximum measurable voltage DC 1000 V
1) Objects of measurement
Voltages of batteries and DC circuits.
2) Measuring ranges (8 ranges) : 0.3/1.2/3/12/30/120/300/1000 V
3) Measurement procedure Insert the red plug of
DCV A


test leads in to the+input terminal, andBattery
the black plug into the–COM terminal.
 Turn the function/range
selector to the appropriate
range of DCV.

 Turn on the power
switch (power ON:
Lamp blinks).
 Turn the electrical zero adjuster (ZERO ADJ), to adjust the
pointer to the zero position at the left end of black DCV•A scales.
 Apply the black test pin to the negative (–) potential side of
the circuit to be measured and the red test pin to thepositive (+) potential side (parallel connection to the load).
 Read the indication on the DCV•A scales in a unit of V (volt).
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
Read the indication in the 1000 V range by multiplying 0 - 120
scales by 10. However, never measure voltages exceeding
1000 V to ensure safety.
It will be convenient to use the ±DCV function for circuits
where positive voltage and negative voltage are present.
•

0

ON

OFF

— 37 —

6-4-2 ±DCV (±DCV ) Maximum measurable voltage DC±600 V
1) Objects of measurement
Voltages of DC circuits where positive voltage and negative
voltage are present on the reference such as IC circuits.
2) Measuring ranges (8 ranges)±0.15/±0.6/±1.5/±6/±15/±60/±150/±600 V
3) Measurement procedure Insert the red plug oftest leads into the
A
V
C
D

±
+input terminal, and theblack plug into the–COM terminal.
 Turn the function/range

selector to the appropriateblue ±DCV range at upper

left.

 Turn on the power
switch (power ON :Lamp blinks).
 Turn the electrical zero adjuster (ZERO ADJ) to adjust the
pointer to the zero position at the center of blue ±DCV•A scales.
 Apply the black test pin to the reference measures point, andthe red test pin to the desired measuring point.
 Read the indication on the ±DCV•A scales in a unit of V (volt).
If the indication is on the right side of the zero position, the redtest lead is on the positive potential (voltage), and the black test
lead is on the negative potential (voltage).
If the indication is on the left side of the zero position, the redtest lead is on the negative potential (voltage), and the black
test lead is on the positive potential (voltage).
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
Before measurement, make sure that the meter pointer isadjusted correctly to the zero position at the center of±DCV•A scales.
If shifted, an indication error occurs by the amount of shift.
The zero meter position of the functions expect ±DCV and±DCA functions is at the left end of black DCV•A scales.
•

0＋

Rf100k

2

＋
－

3

－

8

＋

4

Rc9.1k－— 38 —

1

6-4-3 ACV (ACV rms) Maximum measurable voltage AC 750 V
1) Objects of measurement
Voltages of sine wave alternating current such as lamp line
circuits converted to root-mean-square (rms) values.
2) Measuring ranges (6 ranges)
3/12/30/120/300/750 V3) Measurement procedure
ACV rms
 Insert the red plug oftest leads into the+input terminal, and theblack plug into theOutletrms–COM terminal.
 Turn the function/range
selector to the appropriate
ACV rms range.
 Turn on the power switch(power ON: Lamp blinks).
 Turn the electrical zero adjuster (ZERO ADJ) to adjust the
pointer to the zero position of red ACV (rms) scales.
 Apply the red and black test pins to two measuring points(parallel connection to the load). In the case of alternating
current, the polarity of test leads may be ignored.
 Read the meter indication on red ACV (rms) scales in a unit ofV (volt). The figures are black figures common to DCV.
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
The AC function of this unit uses the p-p rectifying systemthat indicates the value between positive and negative peakvalues of sine wave alternating current (p-p value) byconverting into the root-mean-square value.
Accordingly, the correct rms value is indicated for the sine
wave AC, but an indication error will occur according towaveforms in AC voltage measurement of waveforms otherthan sine wave AC.
Even for the voltage of two waveforms having the same rms
value, different values will be indicated if the voltage between
positive and negative peak values are different. On thecontrary, for the voltage of two waveforms having different rms
values, the same value will be indicated if the voltage between
positive and negative peak values are the same.
0(— 39 —)

The frequency characteristics are good, but an indication
error will increase for high frequencies. (See 8-3)
Read the indication by multiplying 0 - 120 graduations by 10
in the 750 V range. Never perform measurement exceeding
750 V to ensure safety.
After over voltage was applied, the meter will swing out fora while even if the input is removed, but this is not a
problem, and the pointer will return to the zero position in a
few seconds.
Because the instrument is super-sensitive, the meter may moveby just connecting test leads, but it is not failure of the
instrument.
It may malfunction when measuring voltage/current in the
inverter circuit.
Differences of indicated values between general testers andthis unit according to measuring waveforms
1. Measurement of sine wave AC
Both general testers and this unit indicate root-mean-squarevalues.
2. Measurement of distorted wave AC
 General testers: Indicate a value proportional to the mean value.
Accordingly, the read value is lower than the actual rootmean-square value.
 This unit: Indicates a value proportional to the p-p value
regardless of waveforms.
Accordingly, the indicated value on the rms scales ACV (rms) ishigher or lower than the actual root-mean-square value
depending on voltage waveforms.

— 40 —

6-4-4 ACV (ACV p-p) Maximum measurable voltage AC 840 Vp-p
1) Objects of measurement
Voltages (p-p values) between maximum and minimum valuesof sine wave and distorted wave alternating current.
 Sine wave (frequency characteristics : See 8-3)
 Distorted wave (Range : 8.4 Vp-p range only, frequency
characteristics : 40 Hz - 50 kHz)• Triangular-wave, square-wave over 20 % duty cycle, or
pursuant voltage with repetitive waveform.
• Triangular-wave, square-wave over 20 % duty cycle, or voltage
with half-wave retification wavefrom.
However, frequency must be in between 40 Hz - 50 kHz, and +side of rectified voltage must be connected to +input terminal of
the instrument.
CAUTION
Above is only for measuring distorted wave voltage of 8.4 Vp-p
range.
The reading is approximate value when measuring non-sine
wave AC at range of 33 Vp-p or higher.
2) Measuring ranges (5 ranges)
8.4/33/84/330/840 V
3) Measurement procedure Insert the red plug ofACV rms
test leads into the+input terminal, andthe black plug into theOutlet–COM terminal.
rms
 Turn the function/range
selector to the appropriateACV p-p range.
 Turn on the powerswitch (power ON:
Lamp blinks).
 Turn the electrical zero adjuster (ZERO ADJ) to adjust the
pointer to the zero position of red ACV (p-p) scales.
 Apply the red and black test pins to two measuring points(parallel connection to the load). The polarity of test leads may
be ignored.
0(— 41 —)

 Read the meter indication using ACV (p-p) scales and red
figures in a unit of V p-p (peak-to-peak volt).
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
Observe the same precautions as those for the AC voltage(ACV rms) measurement.
6-5 AF Output (dB) Measurement
1) Objects of measurement
Low frequency signals such as audio outputs of amplifiers.
2) Measuring ranges
11 dB (Addition table attached: Lower right of scale plate)3) Measurement procedure


( ms)

0 ACV r

dB







ACV ADD
RANGE db
3 0
12 12
30 20
120 32300 40

11dB















 Insert the red plug of test leads into the +input terminal, andthe black plug into the –COM terminal.
 Turn the function/range selector to the appropriate ACV rms
range, for instance, 3 V range (11 dB).
 Turn on the power switch (power ON: Lamp blinks).
 Turn the electrical zero adjuster (ZERO ADJ) to adjust the
pointer to the zero position of red ACV (rms) scales.
 Apply the red and black test pins to two measuring points.
The polarity of test leads may be ignored.
 Read the meter indication on dB scale in a unit of dB(decibel).
 Further, according to the set range (ACVrms), obtain avalue to add from the addition table at the lower right ofscale plate, and add it to the read value. This value is thedB value at the measuring point. (*Note)— 42 — Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
*Note : The dB scale of this unit are drawn in accordance with
the AC 3 V range, assuming that the output level is 0 dB
when the impedance (Z) at the measuring point is 600 Ω
and the output is 1 mW. If 0dB is converted to thevoltage, 0dB is 0.775 V (1 mW = E 2 /Z). When the
impedance at the measuring point is other than 600 Ω,
obtain a value to add from the following table according
to impedance values, and add it to the value obtained in and .
Impedance Value to add Impedance Value to add Impedance Value to add
2 kΩ-5.2 dB
300 Ω+3.8 dB
16 Ω+15.8 dB
1 kΩ
-2.2 dB
150 Ω+6.8 dB8Ω+18.8 dB
500 Ω+0.8 dB
50 Ω+10.8 dB4Ω
+21.8 dB

Observe the same precautions as those for the measurementof AC voltage (ACV rms).

— 43 —

6-6 Current Measurement

WARNING

1. Never apply voltage to the
input terminals.
2. Be sure to make a seriesconnection via load.
3. Do not apply an input
exceeding the maximum
rated current to the input
terminals.

○ Correct
Power
Load

× Incorrect
Power
Load

6-6-1 DCA (DCA ) Maximum measurable current DC 300 mA
1) Objects of measurement
Current that flows in batteries and DC circuits.
2) Measuring ranges (5 ranges) : 0.12 µ/0.3 m/3 m/30 m/300 mA3) Measurement procedure Insert the red plug of
DCV Atest leads into theBattery
Resistance+input terminal, and the(Load)
black plug into the–COM terminal.
 Turn the function/range
selector to the appropriate
DCA range.
 Turn on the power switch(power ON: Lamp blinks).
 Turn the electricalzero adjuster (ZERO ADJ) to adjust the pointer to the zero
position of black DCV•A scales.
 Connect the black test pin to the negative potential side of thecircuit to be measured, and the red test pin to the positive
potential side through the load (in series).
 Read the indication on the DCV • A scales in a unit of µA(microampere) or mA (milliampere) depending on the range used.
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
In the current measurement, the internal resistance of the current
range is inserted in series in the circuit to be measured, andtherefore the measured value will be smaller than the actual
current value depending on the intensity of internal resistance.
The fuse (500 mA) in this unit shuts off the circuit if a voltage orcurrent over 500 mA (0.5 A) is applied.
•0— 44 —

6-6-2 ±DCA (±DCA ) Maximum measurable current ±DC 150 mA1) Objects of measurement
This function is useful for measuring circuits where the current
directions ± are not constant such as a detection circuit.
2) Measuring ranges (5 ranges)±0.06 µ/±0.15 m/±1.5 m/±15 m/±150 mA3) Measurement procedure Insert the red plug oftest leadsinto the +input±DCV A
Battery
Resistanceterminal, andthe black(Load)
plug into the –COM

terminal.
 Turn the function/range
selector to the appropriateblue ±DCA range at thelower left.
 Turn on the power switch(power ON: Lamp blinks).
 Turn the electrical zero adjuster (ZERO ADJ) to adjust the
pointer to the zero position at the center of blue ±DCV•A scales.
 Connect the black test pin to a measuring point on one side of
the circuit to be measured, and the red test pin to a measuring
point on another side through the load (in series).
 Read the indication on the ±DCV•A scales in a unit of mA(microampere) or mA (milliampere) depending on the range
used.
If the indication is on the right side of the zero position, thered test lead is on the positive potential (voltage), and theblack test lead is on the negative one.
If the indication is on the left side of the zero position, thered test lead is on the negative potential (voltage), and theblack test lead is on the positive one.
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
Observe the same precautions as those for the DC Current(DCA ) measurement.
•＋－— 45 —

0

6-6-3 DCA (DC 6 A)
1) Objects of measurement
DC current below 6 A in compact power supply circuits, etc.
2) Measurement procedure Insert the red plug of test
DCV A
power supply
leads into the DC 6 A+/SW

AC 6 A input terminal,
Loadand the black plug into

the –COM terminal.
 Turn the function/range
selector to the DC 6 A
DC6Arange at the lower center.
 Turn on the power switch of this unit (power ON:
Lamp blinks).
 Turn the electrical zero adjuster (ZERO ADJ) to adjust the
pointer to the zero position of black DCV•A scales.
 Connect the black test pin to the negative potential side of thecircuit to be measured, and the red test pin to the positive
potential side through the load (in series).
(To ensure safety, turn off the power switch of the circuit to bemeasured before the test pins are connected, and after that,turn on the power switch of the circuit to be measured.) Read the meter indication on black DCV • A scale bymultiplying 0 - 30 figures by 0.2. The unit is A (ampere).
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
The continuous measurable time of the current 3 - 6 A is within
30 seconds as the shunt resistor in this unit overheats.
The internal resistance of the DC 6 A range is very small andtherefore if a voltage is applied by mistake to this range, verylarge current will flow, causing a danger. Though this current isshut off by the built-in fuse (6.3 A), take care not to make awrong measurement.
•0— 46 —

6-6-4 ACA (AC 6 A)
1) Objects of measurement
AC current below 6 A in compact power supply circuits, etc.
2) Measurement procedure Insert the red plug oftest leads into thepower supply
DC 6 A+/AC 6 A input
AC6A
SW

Load
terminal, and the blackplug into the –COM

terminal.
 Turn the function/range

selector to the AC 6 A
AC6Arange at the lower center.
  Turn on the power switchof this unit (power ON:
Lamp blinks).
 Turn the electrical zero adjuster (ZERO ADJ) to adjust the
pointer to the zero position of red AC 6 A scale at the bottom.
 Connect the black test pin to a measuring point on one side of
the circuit to be measured, and the red test pin to a measuring
point on another side through the load (in series).
(To ensure safety, turn off the power switch of the circuit to bemeasured before the test pins are connected, and after that,turn on the power switch of the circuit to be measured.) Read the meter indication on red AC 6 A scale and 0 - 6
figures in a unit of A (ampere).
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
The continuous measurable time of the current 3 - 6 A is within
30 seconds as the shunt resistor in this unit overheats.
The internal resistance of the AC 6 A range is very small andtherefore if a voltage is applied by mistake to this range, verylarge current will flow, causing a danger. Though this current isshut off by the built-in fuse (6.3 A), take care not to make awrong measurement.
Further, observe the same precautions as those for themeasurement of DC current (DCA ).
0— 47 —

6-7 Resistance (Ω) Measurement
Maximum measurable resistance 100MΩWARNING
Measuring resistance of a part which is under voltage not only causes
a failure of this unit but also poses a danger to the human body.
1) Objects of measurement
Resistance of resistors and circuits, and also the continuity ofparts and circuits.
2) Measuring ranges (6 ranges) : X1/X10/X100/X1 k/X10 k/X100 k
3) Measurement procedure
Short-circuit
 Insert the red plug of test∞
leads into the +input
terminal, and the black Resistor plug into the –COM 
terminal.
 Turn the function/range

selector to the appropriateΩ range.
 Turn on the power switch(power ON: Lamp blinks).
 Turn the electricalzero adjuster (ZERO ADJ) to adjust the pointer to the ∞position at the left end of blue Ω scales at the top.
 Short-circuiting red and black test pins, turn the 0 Ω adjuster (0 Ω
ADJ) to adjust the pointer to the 0 Ω position at the right end ofthe Ω scale.
 Release the short circuit by the red and black test pins, andreconnect the test pins to the object to be measured (suchas a resistor).
 Read the indication on the Ω scale in a unit of Ω (ohm).
 Detach the test pins from the circuit to be measured.
 Turn off the power switch (power OFF: Lamp blinking goes off).
At Ω range, the polarity of +/– is reverse from that marked on
the body panel.
If a voltage is applied to the Ω function, a fuse (500 mA) built inthis unit shuts off the voltage for safety. However, the shunt
resistor in the range used may be burnt simultaneously
depending on the waveform timing of the input voltage.
0— 48 —

Operating voltage for Ω range of this tester is 3 V, so lighting testof LED can be performed. Appropriate range is Ω x 10 range.
For the Ω function, the measured current will be different largely
depending on the ranges used. Also, the resistance of asemiconductor will vary largely depending on the intensity of themeasured current. Accordingly, even for the same semiconductor(for instance, diode), the measured value will vary largely
depending on the ranges used.
If a test pin is touched by a finger during measurement ,measurement will be influenced by the resistance in the humanbody to result in measurement error.
Be sure to use the rated fuse (φ5 x 20, 500 mA/250 V, parts
No.F1176) for the instrument. In case a fuse other than the
rated one is used, indication errors may occur, and/or circuit
protection is become unable.
If the pointer does not move to 0 line even when the 0 Ω adjuster isturned fully, replace the internal batteries (R6P:1.5 V x 2) to
new ones.
The reading may vary because of external inductance whenmeasuring high resistance value.
6-8 DC High Voltage (HV) Measurement (Optional HV Probe)
Max. measurement value 30 kV DC

WARNING
1. The probe are designed for the measurement of very small
direct current circuit. Never use the probe to measurement
high voltage in power lines, such as transmission anddistribution lines; it is very dangerous.
2. Never apply input signals that exceed 30kV.
3. Be sure to disconnect the test pins from the circuit whenchanging the function/ range selector.
4. Always keep your fingers behind the finger guards on theprobe when making measurements.
1) Application
The probe is suitable for measuring voltage of high impedance
circuits, such as CRT anode voltage of TV sets.
2) Measuring range:
HV PROBE— 49 —

3) Measurement procedure
CRTInsert the black plug of
DCV A
Anode
the HV probe into the–COM input terminaland the red plug into 
the +input terminal.

Earth lineTurn the function/range
selector to the
HV PROBE position.
Turn on the power switch(power ON: Lamp blinks).
Turn the electricalzero adjuster (ZERO ADJ) to adjust the pointer to the zero
position of black DCV•A scales.
First, connect the clip (black) of the probe to the earth line(–COM) in the circuit to be measured, and then apply themeasuring pin on the probe body to your measuring point.
Read the pointer on DCV•A (0 - 30) scale in a unit of kV.
After measurement, remove the measuring pin from themeasured circuit, and then remove the clip.
Turn off the power switch (power OFF: Lamp blinking goes off).
The HV-60 probes cannot be used for AC voltage measurement.
In the measurement of circuits having high internal resistancesuch as high voltage circuits of TV sets, a large voltage drop
occurs in high voltage circuits when the measured current
flows, and thus a meter indication may be lower by several
percents than the actual voltage.
0•

HV PROBE

6-9 End of Measurement

When measurement is end, be sure to return the power switch to the
OFF position and the function/range selector to the ACV 750 position.
Be sure to turn off the power switch after use, as the built-in
batteries are consumed.

— 50 —

[7] MAINTENANCEWARNING

1. This section is very important for safety. Read andunderstand the following instruction fully and maintain yourinstrument properly.
2. The instrument must be calibrated and inspected at least
once a year to maintain the safety.
7-1 Maintenance and inspection
1) Appearance
Is the appearance not damaged by falling ?
2) Test leads and fuse
Are the test leads not damaged ?
Are the core wire not exposed at any place of the test leads ?
Make sure that the test leads are not cut, referring to thesection 6.1.
If your instrument fails any of above check, do not use it, and have it
repaired or replace it to new one.
7-2 Calibration
The manufacturer may conduct calibration and inspection. For
more information, please contact the dealer or manufacturer.
7-3 How to Replace Built in Battery and Fuse

WARNING
1. If the rear case is removed with input applied to the input
terminals, you may get electrical shock. Before starting thework, always make sure that no inputs is applied.
2. Be sure to use a fuse that has the same rating so as to ensure
safety and performance of tester.
3. When removing the rear case do not touch the internal parts orwire with hand.
4. Two types of fuses (500 mA and 6.3 A) are used. Be careful not
to confuse them.

— 51 —

＜How to replace the battery or fuse＞

 Remove the rear case screw with a screwdriver.
 Remove the rear case.
 Take out the battery or fuse and replace it with a new one.
 Attach the rear case and fix it with the screw .
Check and see whether or not indications of respective ranges
are normal.
Set batteries in correct polarity.
Spare fuse (500 mA)
Battery(Layer-built cell)(6F22) 9 V
R6P

Fuse (500 mA)

R6P

6F22

Battery (R6P)
1.5 V X 2

Fuse (6.3 A)

Fuse of the specified rating and type
• F500 mAH/250 V (φ5 x 20 mm, ceramic tube) part No.F1176• F6.3 AL/250 V(φ5 x 20 mm, ceramic tube) part No.F1177— 52 —

7-4 Cleaning and Storage

CAUTION
1. The panel, rear case, and meter cover are weak to volatile solvents(such as thinner and alcohol), and therefore should be cleaned with
soft dry cloth or slightly water-damped cloth.
2. The panel and the rear case are not resistant to heat. Do not place theinstrument near heat-generating devices (such as a soldering iron).
3. Do not store the instrument in a place where it may be subjected tovibration or where it may fall.
4. For storing the instrument, avoid hot, cold or humid places orplaces under direct sunlight or where condensation is anticipated.
5. If this unit will not be used for a long period, be sure to remove thebatteries from the unit.
Following the above instructions, store the instrument in goodenvironment. (See 8.1)

[8] SPECIFICATIONS

8-1 General Specification
Meter:Internal magnet, Taut band meter (48 µA)
AC Rectifying System :p-p voltage rectifying system
Meter Drive Circuit :FET differential amplifier
Accuracy Assurance Temperature/ Humidity Range:23 ℃±2 ℃ 75 %RH max. No condensation
Operating Temperature and Humidity:5~31 ℃, 80 %RH max.
:31 ℃＜~40 ℃, 80~50 %RH (decreasing linearly) No condensation
Storage Temperature/Humidity Range:–10~50 ℃, 70 %RH max. No condensation
Environmental Conditions:Indoor use, Altitude up to 2000mm
Built-in Battery :R6P or SUM-3 (1.5 V x 2), 6F22 (9 V x 1)
Built-in Fuse :F500 mAH/250 V (φ5 x 20 mm, ceramic tube) part No.F1176:F6.3 AL/250 V (φ5 x 20 mm, ceramic tube) part No.F1177(Fast acting fuse, Blowout capacity : 1500 A)
Built-in Battery Life (6F22,for Meter Drive Circuit):Continuous 500 hours (When power sw ON/input terminals open)✽Factory-preinstalled built-in battery
A battery for monitoring is preinstalled before shipping, therefore it may run
down sooner than the battery life specified in the instruction manual.
— 53 —

The “battery for monitoring” is a battery to inspect the functions andspecifications of the product.
Overload circuit protection:Circuit protection by diode and fuse. However, for the Ωfunction, the circuit is protected only at the input of
positive
Dimension and Mass :165(H) X 106(W) X 46(D) mm 375 g
Accessories:Instruction manual (EM7000) 1 Test leads (TL-21a) 1
Spare fuse (500 mA/250 V) 1
8-2 Optional Accessories• Carrying case (C-CA) • HV probe (HV-60):30 kV • Clip adapter (CL-11)— 54 —

8-3 Measurement Range and Accuracy
Accuracy assurance range :23 ℃±2 ℃, 75 %RH max. No condensation
Attitude:Horizontal ± 5°
:ACV accuracy in the case of sine wave (50~60 Hz)**markFunctionFull scale value

Accuracy

0.3 V
1.2 V
DCV
( )

± 3 % Against full scale

3V
12/30/120/300/1000 V

(

)

ACV
( )
rms
p-p

Internal resistance Approx. 12 MΩ
Internal resistance Approx. 11 MΩ
Internal resistance Approx. 10 MΩ± 20 % Against full scale

30 kV

±DCV

Remarks
Internal resistance Approx. 2.5 MΩ

The tolerance depends on a
combination of optional probes.

Same as the internal resistance±0.15/0.6/1.5/6/± 7 % Against full scale of corresponding DCV range.
15/60/150/600 V
3 V (rms)
8.4 V (p-p)** ± 3 % Against full scale
50 Hz basis
40 Hz~1 MHz : within ± 3 %Internal impedanceApprox. 2.5 MΩ(50/60 Hz)

12 V (rms)
33 V (p-p)** ± 3 % Against full scale
50 Hz basis
40 Hz~1 MHz : within ± 5 %Internal impedanceApprox. 1.1 MΩ(50/60 Hz)

30 V (rms)
84 V (p-p)** ± 3% Against full scale
50 Hz basis
40 Hz~10 kHz : within ± 5 %Internal impedanceApprox. 800 kΩ(50/60 Hz)

120/300 V (rms)
330/840 V (p-p)** ± 3 % Against full scale
50 Hz basis
40 Hz~1 kHz : within ± 5 %Internal impedanceApprox. 800 kMΩ(50/60 Hz)

750 V± 3 % Against full scale Approx. 10 MΩ (50/60 Hz)(rms)

Internal impedance— 55 —

Function

ACV
( )
p-p

AF output
(dB)

DCA
( )

±DCA
(

)

ACA
( )

Full scale value

8.4 Vp-p*－10~51 dB
0 dB=0.775 V(1 mW)
in 600 Ω inpedance
circuitAccuracy
Square symmetric wave
(50 Hz Duty 50 %)± 6 % Against full scale
50 Hz basis
40 Hz~100 kHz : within ± 3 %Triangular symmetric wave
(50 Hz)± 6 % Against full scale
50 Hz basis
40 Hz~100 kHz : within ± 3 %Remarks

Internal impedanceApprox. 2.5 MΩ
(50/60 Hz)± 3 % of arc

A voltage drop by fuses
0.12 µA± 3 % Against full scale
is excluded : 300 mV
0.3 m/3 m/30 m/300 mA
6A± 4 % Against full scaleContinuous measurable
time max. 30 s

±0.06 µA
±0.15 m/1.5 m± 7 % Against full scale

A voltage drop by fuses
is excluded : 150 mV/15 m/150 mA
6A

2 k(X1)/20 k(X10)/
Resistance 200 k(X100)/2 M(X1 k)/
20 M(X10 k)/(Ω)
200 M(X100 k)± 5 % Against full scale Continuous measurable(sine wave 50~60 Hz) time max. 30 s
± 3 % of arc

Center value 20 Ω (X1 range)
Max. value 2 kΩ (X1 range)
Release voltage : Approx. 3 V* Above is only for measuring distorted wave voltage of 8.4 Vp-p range.

The reading is approximate value when measuring non-sine wave AC atrange of 33 Vp-p or higher.

Specifications and external appearance of the product describedabove may be revised for modification without prior notice.
— 56 —

[9] AFTER-SALES SERVICE
9-1 Warranty and Provision
Sanwa offers comprehensive warranty services to its end-users
and to its product resellers. Under Sanwa's general warranty
policy, each instrument is warranted to be free from defects inworkmanship or material under normal use for the period of one(1) year from the date of purchase.
This warranty policy is valid within the country of purchase only,
and applied only to the product purchased from Sanwa authorized
agent or distributor.
Sanwa reserves the right to inspect all warranty claims todetermine the extent to which the warranty policy shall apply. This
warranty shall not apply to test leades, fuses, disposables
batteries, or any product or parts, which have been subject to oneof the following causes:
1. A failure due to improper handling or use that deviates from the
instruction manual.
2. A failure due to inadequate repair or modification by people
other than Sanwa service personnel.
3. A failure due to causes not attributable to this product such as
fire, flood and other natural disaster.
4. Non-operation due to a discharged battery.
5. A failure or damage due to transportation, relocation or
dropping after the purchase.
9-2 Repair
Customers are asked to provide the following information whenrequesting services:
1. Customer name, address, and contact information
2. Description of problem
3. Description of product configuration
4. Model Number
5. Product Serial Number
6. Proof of Date-of-Purchase
7. Where you purchased the product1) Prior to requesting repair, please check the following:
Capacity of the built-in battery, polarity of installation anddiscontinuity of the test leads.
— 57 —

2) Repair during the warranty period:
The failed meter will be repaired in accordance with theconditions stipulated in 9-1 Warranty and Provision.
3) Repair after the warranty period has expired:
In some cases, repair and transportation cost may become
higher than the price of the product. Please contact Sanwa
authorized agent / service provider in advance.
The minimum retention period of service functional parts is 6
years after the discontinuation of manufacture. This retention
period is the repair warranty period. Please note, however, if
such functional parts become unavailable for reasons of
discontinuation of manufacture, etc., the retention period may
become shorter accordingly.
4) Precautions when sending the product to be repaired:
To ensure the safety of the product during transportation, place
the product in a box that is larger than the product 5 times ormore in volume and fill cushion materials fully and then clearlymark “Repair Product Enclosed” on the box surface. The costof sending and returning the product shall be borne by thecustomer.
9-3 SANWA web site
http://www.sanwa-meter.co.jp
E-mail: exp_sales@sanwa-meter.co.jp— 58 —

MEMO

MEMO

本社=東京都千代田区外神田2－4－4･電波ビル
郵便番号=101-0021･電話=東京（03）3253－4871㈹大阪営業所=大阪市浪速区恵美須西2－7－2
郵便番号=556-0003･電話=大阪（06）6631－7361㈹Dempa Bldg., 4-4 Sotokanda2-Chome, Chiyoda-Ku,Tokyo, Japan

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