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YOKOGAWA CL235 User's Manual

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User’s

Manual

CL235

Clamp-on Tester

クランプテスタ

IM CL235

2003.04 初版(MC)

IM CL235

Contents

 Precautions for Safety Use of the Instrument --------------------------- i

1. Instrument Layout ------------------------------------------------------------1

2. Measurement ------------------------------------------------------------------3

2.1 Preparation for Measurement ------------------------------------------------ 3

2.2 DC Current Measurement----------------------------------------------------- 3

2.3 AC Current Measurement----------------------------------------------------- 4

2.4 DC Voltage Measurement----------------------------------------------------- 5

2.5 AC Voltage Measurement----------------------------------------------------- 5

2.6 Resistance Measurement ----------------------------------------------------- 6

2.7 Continuity Check (400Ω range fixed)--------------------------------------- 7

2.8 Frequency Measurement------------------------------------------------------ 7

2.9 Peak Measurement ------------------------------------------------------------- 8

2.10 Average Measurement--------------------------------------------------------- 9

3. Other Functions ------------------------------------------------------------- 10

3.1 Sleep Function ----------------------------------------------------------------- 10

3.2 Data Hold Function ----------------------------------------------------------- 10

3.3 LoHz Function------------------------------------------------------------------ 10

3.4 Optional Accessories --------------------------------------------------------- 10

4. Battery Replacement ------------------------------------------------------ 12

5. Specifications ---------------------------------------------------------------- 13

6. Calibration and After-sales Service ------------------------------------ 17

IM CL235 i

 Precautions for Safe Use of the Instrument

When handling the instrument, ALWAYS observe all of the cautionary notes

on safety given below. Yokogawa M&C Corporation is not at all liable for

damage resulting from misuse of this product by the user that is contrary to

these cautionary notes.

Various symbols are used on the instrument and in this manual to ensure the

product is used safety and to protect operators and property from possible

hazards or damage. The following safety symbols are used where appropri-

ate. Read the explanations carefully and familiarize yourself with the symbols

before reading the text.

The instrument and this manual use the following safety symbols:

Danger! Handle with Care.

This symbol indicates that the operator must refer to an explanation

in the User’s Manual in order to avoid the risk of personal injury o

r

death and/or damage to the instrument.

Double Insulation

This symbol indicates double insulation.

AC Voltage/Current

This symbol indicates AC voltage or current.

DC Voltage/Current

This symbol indicates DC voltage or current.

DC/AC Voltage/Current

This symbol indicates DC/AC voltage or current.

Ground

This symbol indicates ground (earth)

WARNING

Indicates that there is a possibility of serious personal injury or loss of life if

the operating procedure is not followed correctly and describes the precau-

tions for avoiding such injury or loss of life.

CAUTION

Indicates that there is a possibility of serious personal injury of damage to the

instrument if the operating procedure is not followed correctly and describes

the precautions for avoiding such injury or damage.

NOTE

Draws attention to information essential for understanding the op-

eration and features.

ii IM CL235

WARNING

● Never make measurement on a circuit above 600V AC or 600V DC.

● Do not use the instrument in an atmosphere where any flammable or ex-

plosive gas is present.

● Do not attempt to make measurement in the presence of flammable gas-

ses, fumes, vapor or dust. Otherwise, the use of the instrument may cause

sparking, which can lead to an explosion.

● Avoid using the instrument if it has been exposed to rain or moisture or if

your hands are wet.

● Do not exceed the maximum allowabIe input of any measurement range.

● Never open the battery compartment cover when making measurement.

● Do not use the instrument if there is any damage to the casing or when the

casing is removed.

● Do not turn the Function Selector switch with plugged in test leads con-

nected to the circuit under test.

● Do not install substitute parts or make any modification to the instrument.

Return the instrument to Yokogawa M&C or your distributor for repair or

re-calibration.

● Always switch off the instrument before opening the battery compartment

cover for battery replacement.

WARNING

To avoid damage to the instrument or electric shock!

The restrictions on the maximum voltage level for which the CL235 testers

can be used, depend on the over-voltage categories specified by the safety

standards. These category specifications are formulated to protect operators

against transient impulse voltage in power lines.

Maximum Allowable Input

Function

OVERVOLTAGE CATEGORY III

A, A

AC 600A rms / DC 1000A

Measuring circuit voltage : AC 600V rms

DC 600V

V, V

Input terminal-to-ground voltage

AC 600V rms/DC 600V

Over-voltage category I (CAT.I):

Signal level, special equipment or parts of equipment, telecommunication, electronic

etc., with smaller transient over-voltages than CAT.II.

Over-voltage category II (CAT.II)

Local level, appliance, portable equipment etc., with smaller transient over-voltages

than CAT.III.

Over-voltage category III (CAT.III):

Distribution level, fixed installation, with smaller transient over-voltages than CAT.IV.