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.

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.



 To avoid the risk of injury to personnel including electrical shock or even fatalities,

carefully observe and follow the warnings listed below.

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

WARNING

CAUTION

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.

WARNING

 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.

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IM 3201–E

 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

3. If any questions arise or errors are found, or if any information is missing out from

4. Yokogawa is by no means liable for any damage resulting from the misuse of this

· To avoid deterioration or damage to the circuit components, keep out of direct

· Both sides of the front cover of the tester have been treated with antistatic coating.

· The case and the tester cover are made of thermoplastic resin. Keep the

CAUTION

 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.

CAUTION

sunlight and do not use or store the instrument in locations subject to high
temperature and high humidity including inside vehicles.

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.

instrument away from any high temperature heat source (e.g. a soldering iron).

Yokogawa.
this manual, please inform us.
product by the user.

IM 3201–E

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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

IM 3201–E

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IM 3201–E

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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% for AC. 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.

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IM 3201–E

2. Parts Identication

14. Bottom Case

4. Cover Fixing Screw

9. Common T erminal

11. OUTPUT Terminal

15. Measuring Probe

12. Case

Fixing Screw

13. Rubber Leg

2. Knife-edge
Pointer

3. Meter Cover

6. Polarity Select
Switch

Fig 2.1 Parts Identication

1. Scale

5. Zero Adjust Screw

7. Zero ohm
Adjust Knob

8. Measuring Range
Select Switch

10. V.A.Ω Terminal

IM 3201–E

Fig 2.2 Measuring Probe

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