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5.1 Replacing the Batteries and Fuses
40
Replacing the Fuses
Fuse Protection Circuitry
A 5
Ω
protective resistor and 0.44 A safety fuse
(1000 V AC/DC, 10 kA cut-off capacity) are
installed in series with the positive terminal of the
instrument to prevent short-circuit accidents during
voltage measurement of power line circuits. If a
short occurs in the instrument circuitry, current flow
is limited by the protective resistance until the
safety fuse opens. The protective resistance limits
the short-circuit current, minimizing arcing at the
tip of the test probe and providing safer operation.
Replace the fuse only with one of the speci-
fied characteristics and voltage and current
ratings. Using a non-specified fuse or short-
ing the fuse holder may cause a life-threat-
ening hazard.
Fuse type:
Model DMM-44/100, Fast-acting, Rating:
0.44 A/1000 V (AC/DC), Breaking capacity:
10 kA (made by Cooper Bussmann)
Be careful not to damage the circuit board or case
when changing fuses. If removing the fuse by
hand, be careful not to hurt your nails or fingers.
When measurement cannot be performed, the
fuse may have blown due to excess current. When
the fuse has blown, the beeping sound will not be
generated during a continuity check.
Summary of Contents for 3255-50 HiTESTER
Page 1: ...INSTRUCTION MANUAL DIGITAL HiTESTER 3255 50 ...
Page 2: ......
Page 16: ...Usage Notes 12 ...
Page 20: ...1 3 Parts Names and Functions 16 ...
Page 36: ...3 4 Auto Power Save Function 32 ...
Page 48: ...5 3 Service 44 ...
Page 49: ......
Page 50: ......