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Model 85020A/B
Operation
SECTION III
OPERATION
3-1.
INTRODUCTION
3-2.
This section contains information for operation of the
85020A/B Directional Bridges.
3-3.
OPERATING PRECAUTIONS
CAUTION
SUSCEPTIBLE TO DAMAGE
FROM STATIC DISCHARGE
The 85020A/B Directional Bridges contain
microcircuits that are highly sensitive to
electrostatic discharge
(ESD).
Damage from
ESD
is most likely to occur
as the bridges
are connected or disconnected- The surest
method of protecting
the
85020A/B
is for
the operator
to wear
a grounding strap
that provides a path to ground of no less
than 1 Megohm and no more than 2.5
Megohms. Alternatively the operator can
ground himself before touching the bridge
connectors,
by touching any grounded
instrument chassis. A work station
equipped with an anti-static surface
should be used. Never
touch the center
contacts of
the connectors.
Tests at Hewlett-Packard have
revealed
that repeated ESD charges
as
low as
250
volts can destroy microwave diodes.
Ordinary activities around everyday
materials can generate ESD voltages of
tens of thousands of volts-
Materials
conducive
to static build-up include floor
carpeting,
nylon clothing,
dry air,
paper,
adhesive tape,
styrofoam,
and vinyl. Use
of
the precautions described here will
considerably reduce the probability of
damage from ESD.
3-1
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Troubleshooting
