Cleaning; Fuse Replacement; Line-Power Fuse - Fluke 8845A Calibration Manual

8845A/8846A
Calibration Manual
punctured. The static problem is thus complicated in that failure may occur anywhere
from two hours to six months after the initial damage.
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 in 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.

Cleaning

To avoid electric shock or damage to the Meter, never get water
inside the meter.
To avoid damaging the Meter's housing, do not apply solvents
to the Meter.
If the Meter requires cleaning, wipe it down with a cloth lightly dampened with water or
a mild detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or methanol-
based fluids to wipe down the meter.

Fuse Replacement

The Meter employs fuses to protect both the line-power and current measurement inputs.

Line-Power Fuse

The Meter has a line-power fuse in series with the power supply. Table 2-1 indicates the
proper fuse for each of the four line voltage selections. This fuse is located on the rear
panel.
To replace this fuse:
1. Unplug the power cord from the Meter and remove any test leads.
2. Remove the fuse holder by inserting a small screwdriver blade in the narrow recess to
2-4
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 left of the fuse holder and pry to the right until the holder pops out, as shown in
Figure 2-1. The Meter is shipped with a replacement fuse of the same rating as the
fuse installed in the fuse block.
XW Warning
W Caution