HOLD
BAT
OFF
2000M
20M
20k
200
V
750
1000
V~
200
1000
OFF
1000
200
V~
750
V
1000
200
20k
20M
2000M
Ω
Ω
Ω
Ω
A~
A~
EXTERNAL
UNIT
WITH 261 OPTION(500V)
INSULATION TESTER
EXTERNAL UNIT
MAX 1000A
CAT ll 1000V
CAT lll 600V
M266 CLAMP METER
02
M266SERIES
1. Safety information
DIGITAL CLAMP MULTIMETER
OPERATOR'S INSTRUCTION MANUAL
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 rugged
structure, good feeling held in operator's hand and
convenient use.
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.
•
•
•
1.3 Symbols
Important safety information .refer to the operating manual.
Earth ground
Dangerous voltage may be present.
1.2 During use
• Never exceed the protection limit values indicated in
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.
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 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 provide. Following table shows function of the series of
clamp meter.
FUNCTION
TEMPERATURE
M266
266F
266C
ACV DCV
ACA
Ω
INSULATION
FREQUENCY
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
※
2.1 Function and range selector
A rotary switch is used to measurement functions and
ranges. When the switch is set to OFF position, the meter
does not operate.
2.2 Transformer jaws
Pick up the AC current flowing through the conductor.
Press the TRIGGER to open the transformer jaws. When
the finger press on the TRIGGER is released, the jaws will
close again.
2.3 Data hold
A push switch (Push ON, Push OFF, All ACA, ACV, DCV, Hz
ranges with this feature).
2.4 Input jacks
This meter has three input jacks that are protected against
overload to the limits shown.
During use connect the black test lead to COM jack and
connect red test lead to V jack. The red test lead is
depended on function selected.
The EXT jack is used for accept insulation tester unit EXT
banana Plugs, when measurement insulation resistance.
01
03
04
05
3. Operating instruction
3.1 Measuring current
1.Set the rotary switch at desired A~ range position.
Press thetrigger to open the transformer jaws and clamp
onto one conductor only (Fig1), The transformer jaws
pick up the AC current flowing through the conductor.
2.When only the figure“ 1 ”displayed, it indicates overrange
situation and the higher range have to be selected.
3.2 Insulation Test
(Option 500V insulation tester unit)
1. Connect the insulation tester unit V
Ω
; COM; EXT three
banana plugs to the clamp meter V
Ω
; COM; EXT.
2. Set the rotary switch of clamp meter at 2000M
Ω
position.
3. Set the insulation tester unit range switch to the 2000M
Ω
position.
4. Uses the insulation tester unit of the test leads connects
its L; E input connect to being tested installations.
(Test installation's must be power OFF)
5. Set the insulation tester power switch to the ON position.
WRONG
CORRECT
FRONT PANEL
1. TRANSFORMER
JAWS
2. TRIGGER
3. DATA HOLD
SWITCH
4. ROTARY SWITCH
5. LCD DISPLAY
6. INPUT JACKS
7. DROP-PROOF
WRIST STRAP
8.TEMPERATURE
MEASURING
SOCKET
9. BARRIER OR
TACTILE
INDICATOR
1
9
3
8
4
5
6
7
2
HOLD
BAT
