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Polarity Reverse Switch
These paragraphs apply to the Model 4165-1344 only. This switch allows the effects of thermal emf's
to be measured and corrected for by averaging the measurements obtained on both polarities. An
estimation of the thermal emf's present may be obtained by the formula:
V
rdgBrdgA
thermals
µ
2
−
=
Where reading A and reading B are the readings taken in the NORMAL and REVERSE modes,
disregarding the decimal point.
Print / Send Switch
The PRINT switch, which is labeled "SEND" on later units, is used by the optional parallel printer or
serial RS232C interface to control data transfer. If the printer interface is installed, pressing this button
will generate a print-out of the resistance data. For the RS232C option (without printer), this will send
one reading to the terminal. Please refer to the appropriate Addendum.
Resistance Window
This 4½ (19999 counts) LED display presents the measured resistance value. The units of measure are
determined by the setting of the Range switches, and are either milliohms, ohms, or kilo-ohms. A
flashing display indicates an overrange condition. In this situation the unit should be upranged to obtain
a solid reading.
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