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 (400
Ω
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 or
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.
