Diode Test; Continuity Test; Transistor Hfe; Maintenance - KNOVA KN 8058 Operation

Accuracy Specifications
H. Diode test
Resolution Remarks
0.001V Open circuit
voltage around
2.8V
I. Continuity test
Resolution
0.1Ω
}
Open circuit voltage is around 0.45V.
}
Broken circuit resistance value is around
>35Ω, the buzzer does not beep.
}
Good circuit resistance value is 10Ω,
the buzzer beeps continuously.
J. Transistor hFE
Range Resolution
hFE 1

Maintenance

This section provides basic maintenance
information including battery and fuse replacement
instruction.
WARNING
Do not attempt to repair or service your Me-
ter unless you are qualified to do so and have the
relevant calibration, performance test, and service
information.
To avoid electrical shock or damage to the Meter,
do not get water inside the case.
A. General Service
• Periodically wipe the case with a damp cloth and
mild detergent. Do not use abrasives or solvents.
• To clean the terminals with cotton bar with
detergent, as dirt or moisture in the terminals
can affect readings.
• Turn off the power of the Meter when it is not in use.
• Take out the battery when it is using for a long time.
• Do not use or store the Meter in a place of
humidity, high temperature, explosive,
inflammable and strong magnetic field.
B. Replacing
the Battery
figure 11
WARNING
To avoid false readings, which could lead to
possible electric shock or personal injury, replace
the battery as soon as the battery indicator "c"
appears.
Overload protection
1000Vdc / 750Vac
Overload protection
1000Vdc / 750Vac
Remarks
Ibo 10 μ A 1000
Make sure the test leads are disconnected from
the circuit being tested before opening the case
bottom.
To replace the battery: (See figure 11)
1. Turn the Meter power off and remove all
connections from the terminals.
2. Remove the screw from the tilt stand and the
battery compartment and separate the battery
compartment and the tilt stand from the case
bottom.
3. Remove the battery from the battery
compartment.
4. Replace the battery with a new 9V battery
(NEDA1604, 6F22 or 006P)
5. Rejoin the tilt stand,
battery compartment
and case bottom, and
reinstall the screw.
MAX
C. Replacing the Fuses
WARNING
To avoid electrical shock or arc blast, or
personal injury or damage to the Meter, use
specified fuses ONLY in accordance with
the following procedure.
To test the fuse: (See figure 12)
The Meter does not response when measuring
current and transistor hFE, go to inspect the Meter
built-in fuses if they are broken.
To replace the Meterís fuse: (See figure 11)
1. Turn the Meter power off and remove all
the connections from the terminals.
2. Remove the screw from the tilt stand and the battery
compartment and separate the battery compartment
and the tilt stand from the case bottom.
3. Remove the two screws from the case bottom,
and separate the case top from the case bottom.
4. Remove the fuse by gently prying one end
loose, then take out the fuse from its bracket.
5. Install ONLY replacement fuses with the
identical type and specification as follows and
make sure the fuse is fixed firmly in the bracket.
A mA range: F1, 1A H 240V, 6x25mm (CE)
10A range: F2, 10A H 240V, 6x25 mm (CE)
6. Rejoin the case bottom and case top, and
reinstall the screw.
7. Rejoin the tilt stand, battery compartment
and case bottom, and reinstall the screw.
9
figure 12