Cleaning; Fuse Test And Replacement; Line Fuse; Current Input Fuses - Fluke 45 Service Manual

45
Service Manual
Two failure modes are associated with ESD. First, a person who has acquired a static
charge can touch a component or assembly and cause a transient discharge to pass
through the device. The resulting current ruptures the junctions of a semiconductor. The
second failure mode does not require contact with another object. Simply exposing a
device to the electric field surrounding a charged object can destroy or degrade a
component. MOS devices can fail when exposed to static fields as low as 30 volts.
Observe the following rules for handling static-sensitive devices:
1. Handle all static-sensitive components at a static-safe work area.
2. Store and transport all static-sensitive components and assemblies in static shielding
Static shielding bags and containers protect components and assemblies from direct
static discharge and external static fields. Store components in their original packages
until they are ready for use.

3-7. Cleaning

To avoid electrical shock or damage to the meter, never allow
water inside the case. To avoid damaging the meter's housing,
never apply solvents to the meter.
If the meter requires cleaning, wipe it down with a cloth that is lightly dampened with
water or a mild detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or
methanol-based fluids when wiping the meter.

3-8. Fuse Test and Replacement

3-9.

Line Fuse

The line fuse (a T 125 mA, 250 V, slow blow) is located on the rear panel. The fuse is in
series with the power supply. For replacement, unplug the line cord and remove the fuse
holder with fuse as shown in Figure 3-1. The meter is shipped with a replacement fuse.

3-10. Current Input Fuses

The 100 mA and 10 A inputs are protected by replaceable fuses.
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3-11. Testing Current Input Fuses

Perform the following procedure to test these fuses:
1. Plug a test lead into the
2. Press
3-4
Use grounded static control table mats on all repair benches, and always wear a
grounded wrist strap. Handle boards by their nonconductive edges only. Store
plastic, vinyl, and Styrofoam objects outside the work area.
bags or containers.
The 100 mA input is protected by 2 fuses, F1 and F5. F1 is rated at F 500 mA, 250 V
(fast blow), 1500 A minimum breaking capacity, IEC-127 Sheet I and F5 is rated at
440 mA, 1000 V, 10,000 A minimum interrupt rating, (fast blow) fuse.
The 10 A input is also protected by a fuse, F2, rated at F 11 A, 1000 V (fast blow),
17,000 A breaking capacity.
O
to select the ohms function.
WWarning
X
input terminal, and power up the meter.