Mastech M266 Series Operator's Instruction Manual

1. SAFETY INFORMATION
The meter is completely portable, LCD, 3 1/2 digit clamp meter with
insulation test function (with option 500V insulation tester unit). It has
been designed according to IEC1010-1 IEC1010-2-032 concerning
electronic measuring instruments with an overvoltage category (CAT II
1000V & CAT III 600V) and pollution 2 and safety requirements for hand-
held current clamps for electrical measurement and test.
Follow all safety and operating instructions to ensure that the meter is
used safely and is kept in good operating condition.
1.1 PRELIMINARY
When using this meter, the user must observe all normal safety
rules concerning:
Protection against the dangers of electronic current.
Protection of the meter against misuse.
Full compliance with safety standards can be guaranteed only if
used with test leads supplied. If necessary, they must be replaced
with the same model or same electronic ratings. Measuring leads
must be in good condition.
1.2 DURING USE
Never exceed the protection
specifications for each range of measurement.
When the meter is linked to measurement circuit, do not touch
unused terminals.
When the value scale to be measured is unknown beforehand, set
the range selector at the highest position.
Before rotating the range selector to change function, disconnect
test leads from the circuit under test.
When carrying out measurements on TV or switching power
circuits always remember that there may be high amplitude
voltage pulses at test points, which can damage the meter.
Never perform resistance measurements on live circuits.
Always is careful when working with voltage above 60V dc or 30V
ac rms. Keep fingers behind the probe barriers while measuring.
limit values indicated
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1.3 SYMBOLS
Important safety information, refer to the operating manual.
Dangerous voltage may be present.
Double insulation ( Protection class II ).
Application around and removal from HAZARDOUS LIVE
conductors is permitted.
Earth ground.
1.4 MAINTENANCE
Before opening the meter, always disconnect test leads from all
sources of electric current.
If any faults or abnormalities are observed, the meter can not be
used any more and it has to be checked out.
Never use the meter unless the back cover and the battery cover
are in place and fastened fully.
Do not use abrasives or solvents on the meter, use a damp cloth
and mild detergent only.
2. DESCRIPTION
This meter is one of a series portable 3 1/2 digital clamp meter for
in
measuring DC and AC Voltage, AC current, resistance, continuity test and
insulation test. Some models also provide frequency or temperature test.
Full overload protection. Low battery indication and over-range indication
are providing. Following table shows function of the series of clamp meter.
FUNCTION
ACV DCV
ACA

INSULATION
TEMPERATURE
FREQUENCY
M266 M266F M266C
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