Cleaning the Connector Contacts
Because the meter uses connector contacts that are almost pure copper,
they are subject to oxidation. Oxidation can cause measurement errors.
See page 251.
To help prevent the formation of oxides on the connector contacts, keep
the connector engaged whenever possible. After extended periods of time,
it may be necessary to treat the connector contacts. The recommended
treatment uses DeoxIT
Ô
and a small bottle of DeoxIT was included with
the 34420A. Use the following procedure to apply DeoxIT to the
connector terminals.
1 Remove the power cord from the meter.
2 Remove the input connector.
3 Stand the meter on a smooth level surface so that the front panel is up.
4 Apply one drop of DeoxIT to each connector pin in the input connector. A
convenient method to apply a single drop is to use a clean piece of wire to
transfer the liquid from the container provided to the connector.
5 Remove any excess DeoxIT from the connector by wiping with a clean soft cloth.
6 Engage and disengage the input cable several times to distribute the
DeoxIT evenly over both halves of the connector.
The input connector may cause measurement problems if the coupling
nut is not tightened properly, the connector keys are not aligned properly,
or the clamping nut is not tightened properly. See the next page.
DeoxIT
Ô
is a trademark of CAIG Laboratories, Inc., San Diego, California.
7
Chapter 7 Measurement Tutorial
Cleaning the Connector Contacts
271
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