8508A
Users Manual
Provides selection of the temperature resolution for subsequent
eadings.
This is the entry point to manage PRT probe information.
PROBE Configuration Management (New, Edit, Delete)
adj107f.eps
PROBE CONFIG Menu
The utilization and management of PRT probe data depends upon a probe identity. For
example, before using the edit and delete capabilities a probe identity must be selected.
For a new probe, defining an identity is the first step in the sequence of establishing the
probe’s characteristics.
New PROBE Entry
adj108f.eps
PROBE# Menu
For entry of the characteristics of a new PRT probe a directed sequence of menus,
initiated with a
NEW command, should be followed. The first menu establishes the
identity of the probe using the alphanumeric keyboard entry system. (NOTE: no
duplication checks are made on the identity.)
adj109f.eps
Connection Menu
Selection of the connection method will determine the measurement configuration that is
used by the Multimeter. This characteristic cannot be modified via the
Edit capability.
2-wire probe configuration. Resistance measurements will be made using
the 2-wire connection, with a single polarity stimulus current.
3-wire probe configuration. An equivalent 3-wire measurement will be
made by automatically taking a reading with the resistance circuits in 2-
wire with a single polarity stimulus current and also in 4-wire with polarity
reversal of the stimulus current, and performing a calculation. Equal
resistance is assumed for all three probe-leads. Input zeros for 2-wire and
4-wire resistance must be performed prior to the selection of the PRT as
these are used in the calculation to remove offsets and internal lead
resistance.
4-wire probe configuration. Resistance measurements will be made using
the 4-wire connection, with a polarity reversal of the stimulus current.
3-26
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