YOKOGAWA 320110 User manual

User's
Manual Model 320110
Circuit Tester
IM 3201–E
13th Edition July 2014 (KP)

Thank you for purchasing this Model 320110 Circuit Tester. To
fully exploit and properly operate the instrument, read this manual
carefully prior to using the product.

— i — IM 3201–E
Precautions for Safe Use
When operating the instrument, be sure to observe the cautionary notes given below
to ensure correct and safe use of the instrument. If you use the instrument in any way
other than as instructed in this manual, the instrument’s protective measures may be
impaired. YOKOGAWA is by no means liable for any damage resulting from use of the
instrument in contradiction to these cautionary notes.

The following safety symbols are used on the instrument and in this manual:
Danger! Handle with Care.
This symbol indicates that the operator must refer to an explanation in
the User’s Manual in order to avoid risk of injury or death of personnel
or damage to the instrument.
This symbol indicates alternating current (AC).
This symbol indicates direct current (DC).
This symbol indicates a fuse.
This symbol indicates a grounding line.
Indicates a hazard that may result in the loss of life
or serious injury of the user unless the described
instruction is abided by.
Indicates a hazard that may result in an injury to the
user and/or physical damage to the product or other
equipment unless the described instruction is abided
by.
Measurement
· This tester is designed for measurement of light electrical circuits. For safe
use, do not use this instrument for the circuit exceeding 250 V (including
power lines). Such strong electrical circuits may contain a surge voltage,
which is several times stronger than that of circuit voltage, thus creating a
very dangerous situation.
· Do not touch the I/O terminals during the measurement of voltage because a
high voltage may be generated on the measurement leads.
Measurement leads
· Use the lead supplied by Yokogawa for the instrument concerned.
· Do not use a deteriorated or damaged leads.
· Check test the leads continuity.
· Do not attach/detach the lead to/from the instrument prior to releasing the
leads from the measured object.
Protection
·If there are any cracks or other damage in the case because of being
dropped or struck, the instrument may not be safely insulated. Do not use the
instrument before any remedial measures are taken.
Battery/Fuse Replacement
·Prior to detaching the cover for replacing the battery or fuse, release the
measurement leads from the measured object and turn off the switch.
Operating Environment
· Do not operate the instrument in a flammable or explosive atmosphere.
· Do not use the instrument when there is condensation on it.
· Do not operate the instrument with wet hands.
Disassembly
· Disassemblement of the instrument should be conducted only by our service
engineers.
WARNING
WARNING
CAUTION
To avoid the risk of injury to personnel including electrical shock or even fatalities,
carefully observe and follow the warnings listed below.

— ii —
IM 3201–E
Measurement
· Do not apply a voltage or current over the allowable limits between the
terminals.
· Do not apply a voltage to the measuring terminals when measuring DC
currents (DC mA).
Power source of measured objects
· A voltage may be applied to metals or wires that are connected to electrical
equipments. Connect the measuring terminals after confirming that a voltage
has not been applied, and the same applied to the grounding systems.
Battery
· If the instrument is not used for a long period, store it with the battery removed.
Otherwise, any leakage from the battery may damage the instrument.
To avoid the risk of injury to personnel including electrical shock or damage to the
instrument, carefully observe and follow the instructions listed below. Notice Regarding This Instruction Manual
1. The contents of this instruction manual are subject to change without prior notice.
2. All rights are reserved by Yokogawa. No one is allowed to make copies of, reprint
any part or all the contents of this instruction manual without permission from
Yokogawa.
3. If any questions arise or errors are found, or if any information is missing out from
this manual, please inform us.
4. Yokogawa is by no means liable for any damage resulting from the misuse of this
product by the user.
CAUTION
CAUTION
· To avoid deterioration or damage to the circuit components, keep out of direct
sunlight and do not use or store the instrument in locations subject to high
temperature and high humidity including inside vehicles.
· Both sides of the front cover of the tester have been treated with antistatic coating.
Use of a wet cloth for wiping the cover shall be avoided since it degrades the
coating. Wipe softly with a dry sheet if the cover gets dirty. Use of volatile solutions
such as thinner, benzine, or other chemicals shall also be avoided.
· The case and the tester cover are made of thermoplastic resin. Keep the
instrument away from any high temperature heat source (e.g. a soldering iron).

— iii — IM 3201–E
All Rights Reserved, Copyright © 2014, Yokogawa Meters & Instruments Corporation
Printed in Japan
Contents
1. Introduction...................................................................................1
2. Parts Identication........................................................................2
3. Operation......................................................................................5
3.1 Instruction for Use...................................................................5
3.2 DC Current Measurement (DC.mA)........................................6
3.3 DC Voltage Measurement.......................................................6
3.4 AC Voltage Measurement (AC.V)...........................................6
3.5 Measurement of Low (Audio) Frequency Output Level..........8
3.6 Resistance Measurement.......................................................8
3.7 Checking Battery Amount and Battery Replacement .............9
3.8 Circuit Diagram (Parts List)...................................................10
4. Use of Accessories (Additional Specications)...........................11
4.1 Model 320310 12 kV DC High Tension Probe
(Order Discontinued Item).....................................................11
4.2 Model 320410 12 A DC Shunt
(Order Discontinued Item).....................................................12
4.3 Model 320510 Clip-On Current Transformer
(Order Discontinued Item).....................................................12
5. Maintenance...............................................................................13
5.1 Adjustment............................................................................13
5.2 Fuse Replacement................................................................13
6. Specications .............................................................................14
6.1 Specications........................................................................14
6.2 Accessory Specications ......................................................15

— iv —
IM 3201–E

— 1 — IM 3201–E
1. Introduction
The Model 320110 is a handy and widely usable circuit tester
designed with high reliability for the measurements of DC/AC
currents, DC/AC voltages, DC resistances, etc. Through these
measurements, a variety of electronic and electrical equipment are
readily adjusted, tested, or maintained.
<Features>
(1) Employment of taut band suspension for the tester permits high
sensitivity, reproducibility of indications, and long duration; yet
its mechanism is rugged against vibration or shock, and has no
friction.
(2) The tester features high input impedance. The internal resistance
of the voltage circuit is as high as 100 kΩ/V at DC, or 10 kΩ/V
at AC, which is higher than that of any other conventional circuit
testers as a tester without amplier. It can also be used as an
electronic voltmeter.
(3) Results of the measurement with 320110 are highly accurate,
with ±2% for DC or ±3% forAC. The scale has a built-in mirror (105
millimeter in scale length) to eliminate parallax in reading.
(4) A solid state overcurrent protective circuit is provided with the
tester so as not to burn the coil due to overcurrent, nor bend the
pointer arm.
(5) The measuring range select switch determines the duration of life
of the instrument. It employs a printed wiring switch which has
low contact resistance and substantial stability and durability in
both mechanical and electrical aspects.
(6) A convenient polarity select switch is provided for DC
measurements.
(7) The instrument requires only one piece of R20P (SUM-1). Battery
replacement is easily conducted.
(8) Shock-resistance plastic (ABS resin) is used for the case of the
tester. It is compact, light, and convenient to carry about.

— 2 —
IM 3201–E
2. Parts Identication
Fig 2.1 Parts Identication
1. Scale
2. Knife-edge
Pointer
3. Meter Cover
6. Polarity Select
Switch
12. Case
14. Bottom Case
Fixing Screw
13. Rubber Leg
4. Cover Fixing Screw
5. Zero Adjust Screw
7. Zero ohm
Adjust Knob
8. Measuring Range
Select Switch
9. Common Terminal
10. V.A.Ω Terminal
11. OUTPUT Terminal
Fig 2.2 Measuring Probe
15. Measuring Probe

— 3 — IM 3201–E
1. Scale The scale has a built-in mirror to avoid
parallax in reading.
Look at the scale so that you can see
the pointer is accurately aligned with the
pointer reected on the mirror, and then
read the value.
2. Knife-edge Pointer
3. Meter Cover This is made of acrylic resin.
4. Cover Fixing Screw
5. Zero Adjust Screw This is to set the pointer to zero with a
screwdriver if it does not rest at zero
prior to measurement.
6. Polarity Select Switch In the case of DC voltage or DC
current measurement, the polarity
select switch is set to the
+DC
or
-DC
position according to the polarity of the
measuring circuit. While, in the case
of AC voltage or low frequency output
level or resistance measurement, it is
turned to
+DC,AC,Ω
. This switch has a
3-contact switch to make deflecting
angles of the pointer wider to clarify the
polarity selection.
<Center Position>
When the switch is rested at the center
position, the circuit is opened and the
pointer coil is shorted, thus, the pointer
does not deect. Set it to this position
when carrying the instrument around.
7. Zero ohm Adjust Knob When measuring resistance,
this is to adjust the pointer
to zero of the [OHM] scale
by shorting the tip ends of
the measuring probes of the
leads.
<Checking batteries>
This is also used when
checking the remaining
amount of built-in battery.
(Refer to 3.7 Checking
Battery Amount and Battery
Replacement)
8. Measuring Range Select Switch This is a switch to select
an object to be measured
and its measuring range
depending on the purpose of
measurement. It consists of a
printed wiring switch.

— 4 —
IM 3201–E
9. Common Terminal This is a common terminal for
measurement. The black lead,
which is one of accessories, is
connected here.
10. V.A.Ω Terminal The red lead, which is one of
accessories, is connected here.
11. OUTPUT Terminal This is to measure AC voltage
including DC components. The
red lead is connected here.
12. Case This is made of shock-
resistance plastic (ABS resin).
13. Rubber Leg
14. Bottom Case Fixing Screw When replacing batteries,
remove this screw to open the
back cover.
15. Measuring Probe This instrument provides two
lead wires (i.e. one black and
one red). The clip adaptor can
be used conveniently by being
connected to the tip end of the
black lead probe.
DC.mA
DC Current 0.012 0.12 1.2 12 120 1200
DC.V
DC Voltage 0.3 1.2 3 12 30 120 300 1200
AC.V
AC Voltage 3 12 30 120 300 1200
Ω
Resistance ×1×100 ×10 k
Table 1 Measuring Range
10
DC.V : 100 kΩ / V
AC.V : 10 kΩ / V
30
0
15
6
50
OHMS
100
10
–20
200
500
2K
∞
1K
5
2
0
0
DC
AC
dB
5
3
10
20
8
2
OHMS
1
+11
25
10
0
30
DC
12
AC
dB
20
10
4
5
Fig 2.3 Scale
Measuring Range Select Switch

— 5 — IM 3201–E
3. Operation
3.1 Instruction for Use
1. Make sure prior to measurement that the pointer rests at the
zero position of the scale. If not, turn the zero adjust screw to
set it to zero. Look at the scale so that you can see the pointer
is accurately aligned with the pointer reected on the mirror, and
then read the value.
2. When the measuring value is unknown, start measurement with
the maximum range provided and then continue to lower range
until proper range is obtained. Do not select the switch while
the pointer is still deecting.
3. Do not place the tester in strong magnetic fields or on steel
plates to avoid possible pointing errors.
4. When storing or carrying the tester, turn off the measuring range
select switch and set the polarity select switch to its center
position to avoid any possible damage.
Make sure to read and observe all the following cautions before
starting measurement to ensure safety.
CAUTION
Checking Fuse
Make sure prior to measurement that the fuse is not burned
out.
<Checking Method> Set the measuring range select switch to
“Ω” range. The fuse operates normally
if the pointer points at zero Ω when
shorting the V.A.Ω terminal.
The pointer does not deflect when the fuse is burned out.
At the start of measurement, always be sure to check it.
Never use the instrument when the fuse is burned out
to avoid electrification. It happens when the instrument
falsely recognizes voltage-applied measured objects as being
inactive.
Checking Measurement Range
·Make sure that the measuring range select switch is
set properly and that the measurement leads and the
measurement (input) terminal are connected appropriately.
Measuring high voltages erroneously while the range is
in “DC mA” may cause personnel injury or damage to the
instrument.
·Prior to turning on/off the measuring range select switch,
disconnect the measurement leads from the measured object.
Installation Location
Be sure to place the instrument on a at stable surface in a
stable environment.
The measurement leads may get disconnected from
the measurement terminals due to overturn or fall of the
instrument. If it happens, there is a possibility of electrical
shock especially when a high voltage is measured.

— 6 —
IM 3201–E
3.2 DC Current Measurement (DC.mA)
CAUTION
There is a risk of damaging the instrument.
If a voltage is erroneously applied while the range is in “DC mA”,
the shunt resistor of the tester will be burned out.
1. Connect the red lead to the
V.A.Ω
terminal and the black lead to
the
COM-
terminal.
2. Set the polarity select switch to the
+DC,AC,Ω
position.
3. Set the measuring range select switch to a desired position on
the “DC mA” range. Check polarity and connect the tip end of the
lead probes in series to the circuit to be measured. Then, read
out the indication on the [DC] scale.
4. If the pointer deects inversely, change over the polarity select
switch to the
-DC
side. Thus, current can be measured without
changing the lead connections.
3.3 DC Voltage Measurement
1. Leads connections and the polarity select switch positioning
are the same as in the case of the DC current measurement
described above.
2. Set the measuring range select switch to a desired position on
the “DC V” range. Check polarity and connect the tip end of the
lead probes in parallel to the circuit to be measured. Then, read
out the indication on the [DC] scale.
3. If the pointer deects inversely, change over the polarity select
switch to the
-DC
side.
3.4 AC Voltage Measurement (AC.V)
1. Connect the red lead to the
V.A.Ω
terminal and the black lead to
the
COM-
terminal.
2. Set the polarity select switch to the
+DC,AC,Ω
position.
3. Set the measuring range select switch to a desired position on
the “AC V” range. Then, read out the indication on the [AC] scale.
4. This voltmeter of the tester is a rectifier type meter in which
germanium diodes are incorporated with the moving coil type
meter, and the scale is calibrated in term of RMS value of
pure sine wave alternating current. For this reason, note that
application of nonsinusoidal AC will cause errors in indication.

— 7 — IM 3201–E
5. When it is desired to measure a voltage of high frequency,
connect the
COM-
terminal to the ground side of the measuring
circuit. This arrangement prevents indication errors caused by
the stray capacitance between the tester and the ground.
(Refer to Fig 3.1 Frequency Characteristics in which an
example of the frequency characteristics is shown.)
6. When measuring AC voltage in the circuit where a DC component
is included, connect the leads respectively to the
OUTPUT
terminal
and
COM-
terminal. For further procedures, follow instructions
described in the paragraph “AC Voltage Measurement”.
7. To the
OUTPUT
terminal a 0.2 μF capacitor (400 W. V) is
internally provided in series so that the DC component is
impeded and only the AC voltage is indicated.
8. In case of low frequency, voltage drop across the capacitor
causes an error in indication. This error depends upon the
measuring range. (Refer to Fig. 3.2 Frequency Characteristics
when OUTPUT Terminal is Used)
0.2
0
1
2
3
4
5
0.5 1 2 105 50 10020
Frequency (kHz)
Error
(%)
120 V Range 30 V Range
3
V
R
a
n
g
e
1
2
V
R
a
n
g
e
Fig 3.1 Frequency Characteristics
50 100 200 500
1000
20
Frequency (Hz)
-10
0
-20
-30
-40
Error
(%)
3 V Range
12 V
Range
30 V Range
Fig. 3.2 Frequency Characteristics
when OUTPUT Terminal is Used

— 8 —
IM 3201–E
3.5 Measurement of Low (Audio) Frequency Output Level
1. The output level denotes the voltage in the audio frequency
range, being applied to a specic load impedance. This output
voltage is expressed in dB.
2. This instrument is calibrated for a 0 dB reference level when 1
mW of power is developed in a 600 Ω load (0.775 AC V into 600
Ω).
3. Measuring procedures are as described in the paragraph “AC
Voltage Measurement”. The indication is read out on the [dB]
scale.
4. The dB values on the scale are the ones when the measure
range select switch is set to the “AC 3 V” range. Add dB value
read from value indicated on dB chart (shown below right) on the
scale panel.
AC.V RANGE
ADD dB 3 12 30 120
0 12 20 32
0 dB: 1 mW 600 Ω
3.6 Resistance Measurement
CAUTION
There is a risk of electrication or damaging the
instrument.
·Prior to measuring the resistance in the circuit of equipment,
the power source to the equipment must be disconnected.
·For the measurement of a circuit which includes capacitors,
the charged electricity must be discharged from the capacitor.
Note that the external voltage may burn the resistors of the
tester.
1. Connect the two measuring lead probes respectively to the
V.A.Ω
and
COM-
terminals.
2. Set the polarity select switch to the
+DC,AC,Ω
position.
3. Set the measuring range select switch to a desired position on
the “Ω” range. Short the tip ends of the two measuring probes
of the leads. Turn the zero ohm adjust knob
ΩADJ
and set the
pointer to zero of the [OHM] scale.
Note: This zero adjustment must be repeated each time when the
measuring range is changed over to another.
4. Connect the tip ends of the measuring probes respectively to
the points across which the resistance is to be measured. Take
the reading on the [OHM] scale, and multiply the value read by
the multiplying factor of the applying measuring range. Thus, the
resistance value is obtained.

— 9 — IM 3201–E
3.7 Checking Battery Amount and Battery Replacement
<Checking the Remaining Amount of Battery>
The condition where the pointer does not come to zero even
when the zero ohm adjust knob is turned clockwise to the
extreme position is to indicate that the built-in battery is worn out.
Replace the battery (R20P, 1.5 V, one piece).
<Battery Replacement>
CAUTION
·Before starting the replacement of the battery, disconnect
the instrument from the circuit to be measured to prevent an
electrical shock hazard.
·Check polarity before installing the battery properly.
To replace the battery, remove the screw of the center of the
bottom case. For battery installation, follow the indication of
polarity noted on the battery holder case.
5. Current for each measuring range is as follows, at zero position
of resistance scale.
× 1 Ω range approximately 150 mA
× 100 Ω range approximately 1.5 mA
× 10 kΩ range approximately 15 μA
6. For checking quality of capacitors, use the × 10 kΩ range.
A good capacitor is charged by the battery voltage of the tester,
to cause a deection of the pointer. The pointer is then returned
gradually to the “∞” position. This phenomenon appears more
markedly as greater the capacity of a capacitor becomes.
Degraded capacitors will not deflect the pointer. And shorted
capacitors will not return the pointer in the “∞” direction. These
are defective capacitors.
7. In case of resistance measurement, polarity of the self-contained
battery is positive at the
COM-
terminal, and negative at the
V.A.Ω
terminal.
Take this relation into consideration when diodes or transistors
are to be tested.

— 10 —
IM 3201–E
3.8 Circuit Diagram (Parts List)
R2
C1
R1
F
R3R4R5R8
R7
C
2
D5M
VR1–DC + DC
SW2
R21
D1
D2
VR2
R23 R30
PTH
ACΩ
D6
D4
D3
R20
R22 VR3
SW
1
R24
R9R
10
R
11
R
12
R
13
R
14
R
15
R
16
R
17
R
18
R
19
R
27
R
28
R
29
E
R
25
R
26
(2A S-M1301 #20)
COM(–)
OUTPUT
A.V.Ω
1200 120 12 1.2 .12 .012 .3 1.2 3 12 30 120 300 1200 1200 300 120 30 12 3 × 1 × 100 × 10 k OFF
DC mA DC V AC V
Ω
Fig 3.3 Circuit Diagram
Parts List
Circuit Parts
R1Wire wound resistor 0.19 Ω
R2Wire wound resistor 1.8 Ω
R3RD1PX 18 ΩF
R4RD1/2PX 180 ΩF
R5RD1/2PX 1.8 kΩF
R6RD1/4PX 110 kΩF
R7RD1/4PX 8 kΩF
R8RD1/4PX 90 kΩF
R9RD1/4PX 180 kΩF
R10 RD1/4PX 900 kΩF
R11 RG08V2K 1.8 MΩF
R12 RG08V3C 9 MΩF
R13 RG08V3C 18 MΩF
R14 RG08V3C 90 MΩF
R15 RG08V3C 9 MΩF
R16 RG08V3C 1.8 MΩF
R17 RD1/2PX 900 kΩF
R18 RD1/4PX 180 kΩF
R19 RD1/4PX 90 kΩF
R20 RD1/4PX 11.3 kΩF
R21 RD1/4PX 10 kΩF
R22 RD1/4PX 10 kΩF
R23 RD1/4PX 50 kΩF
R24 Wire wound resistor 8 Ω
R25 RD1/4PX 792 ΩF
R26 RD1/4PX 79.2 kΩF
R27 RD1/4PX 203 ΩF
R28 RD1/4PX 73.3 kΩF
R29 RD1/2PX 1.45 ΩF
R30 RD1/4PX 27 kΩF
VR1Semixed resistor approx. 10 kΩ
VR2Semixed resistor approx. 10 kΩ
VR3Semixed resistor 40 kΩ
MIndicator 10 µA (9 kΩ)
D1Germanium diode
D2Germanium diode
D3Silicon diode (1GZ61)
D4Silicon diode (1GZ61)
D5Silicon diode (1GZ61)
D6Silicon diode (1GZ61)
C1Film capacitor 0.22 µF; 400 V
C2Film capacitor 0.68 µF; 200 V
F S-M1301 #20 (2 A)
E Dry Cell SUM-1 1.5 V
SW1Measuring Range Select Switch
SW2Polarity Select Switch
PTH Positive temperature coefcient resistor 602M

— 11 — IM 3201–E
4. Use of Accessories (Additional Specications)
4.1 Model 320310 12 kV DC High Tension Probe
(Order Discontinued Item)
COM- V.A.Ω
Tester terminals
Fig 4.1 12 kV DC High Tension Probe
CAUTION
When measuring high voltage, observe the following
safety precautions to avoid potential risks.
· Make sure that the grounded leads are rmly connected.
·Check the probes (must not be wet or contaminated with
foreign materials) prior to measurement to avoid possible
risks.
Wear a pair of gloves (e.g. rubber gloves) to ensure safety.
·Avoid measuring high voltage on the power line to prevent
possible hazards.
1. This probe is intended to be used in the adjustment of high
voltage electronic equipments such as television.
However, the high voltage measurement on power lines is
dangerous, and must be avoided.
2. Firmly connect the Protective Resistance Box of the high voltage
probe to the terminal of the tester so that the probe may come to
the
V.A.Ω
terminal side of the tester (and the clip adapter to the
COM-
terminal side).
3. Set the polarity select switch to
+DC,AC,Ω
and the measuring
range select switch to the “DC 1.2 V” range.
Then, read the value on the [DC] scale.

— 12 —
IM 3201–E
4.2 Model 320410 12 A DC Shunt
(Order Discontinued Item)
Fig 4.2 12A DC Shunt
1. This shut is best suited for the current measurement in power
transistors or SCR circuits.
2. Connect the banana plug of the “+” terminal of the shunt to
the
V.A.Ω
terminal of the tester, and the banana plug of the “-”
terminal to the
COM-
terminal.
3. Set the polarity select switch to
+DC,AC,Ω
and the measuring
range select switch to the “DC 0.012 mA” range (voltage drop
220 mV). Then, read out the indication on the [DC] scale.
4.3 Model 320510 Clip-On Current Transformer
(Order Discontinued Item)
black
red
Fig 4.3 Clip-On Current Transformer
1. By use of this transformer, currents to the commercial frequencies
can be measured without opening the circuit.
2. Connect the red lead of the transformer to the
V.A.Ω
terminal and
the black lead to the
COM-
terminal.
3. Set the polarity select switch to
+DC,AC,Ω
and the measuring
range select switch to the “AC 3 V” range. Then, read out the
indication on the [AC] scale.
4. The transformer provides 5 ranges of current; 12/30/60/120/300A.
These ranges can be selected by the selector switch attached to
the transformer. Read out the indication on the [AC] scale based
on full scale values appropriate to the selected range.

— 13 — IM 3201–E
5. Maintenance
5.1 Adjustment
In case of the accuracy of the tester becomes doubtful as the
result that an excessive load of shock is applied to the tester,
the tester must be tested using other calibrated instrument. If the
accuracy is observed to be over the specied value, the tester
must be readjusted.
In case the resistor is burnt, it must be replaced according to the
circuit diagram and parts list (in Section 3.8), and further, the
sensitivity of the tester must be adjusted in the following manner.
(1)Set the polarity select switch to
+DC,AC,Ω
and the measuring
range select switch to the “DC 0.3 V” range.
Apply “DC 0.3 V” and turn the semifixed resistor VR1(as
indicated on the print board) so that the pointer may indicate the
full scale value correctly.
(2) Set the measuring range select switch to the “AC 120 V” range.
Apply “AC 120 V” and turn the semixed resistor VR2so that the
pointer may indicate the full scale value correctly.
Above procedures make a complete adjustment on the DC, AC, and
Ωcircuits.
5.2 Fuse Replacement
CAUTION
There is a risk of electrical shock to persons.
·Prior to replacing the fuse, disconnect the instrument from the
circuit to be measured, if connected, to prevent an electrical
shock hazard.
·Do not operate the instrument when the case is left open.
· Use only the specied fuse.
In case the fuse has blown, remove the screw of the center of
the bottom case. Then, replace the blown fuse with a new one (of
specied rating) that is provided on the side surface of the case.
After Services
When the instrument does not operate properly and needs repair,
please contact Yokogawa or the store where you bought the
product.

— 14 —
IM 3201–E
6. Specications
6.1 Specications
Measurement Measuring Range Accuracy Remarks
DC Voltage 0.3/1.2/3/12/30/120/300/1,200 V ±2% of full scale value Input Resistance: 100 kΩ/V
Current 0.012/0.12/1.2/12/120/1,200 mA ±2% of full scale value Terminal Voltage Drop: Less than 250 mV
AC Voltage 3/12/30/120/300/1,200 V ±3% of full scale value Input Impedance: 10 kΩ/V
Resistance 2/200/20,000 kΩ ±3% of scale length** Central Scale Mark: 10Ω (for full scale value of 2 kΩ)
Low Frequency Level -20 to 11/23/31/43 dB* ±3% of full scale value Input Impedance: 10 kΩ/V
*: The tolerance for the low frequency output has been expressed as a percentage of the value obtained by
converting the maximum scale value (dB) to a voltage.
**: The scale length of resistance measurement (OHM) is 110 millimeters.
Insulation Resistance: DC 500 V, 100 MΩ
Withstand Voltage: Between the electric circuits and case - up to AC 50 Hz/3,400 V for 1 minute
Battery: R20P (SUM-1), 1 pc.
Dimensions: Approx. 190 × 124 × 71 mm
Weight: Approx. 870 g
Accessories: The following items are supplied with each instrument at no extra cost.
Leadwires with probe and plug RD031…1 pair
Dry Cell JIS C 8501 Types SUM-1 (1.5 V) (built-in)…1 pc.
Clip Adapter…1 pc.
Carrying Case…1 pc.
User's Manual…1 copy