iET PRS-330 series, Operation Manual, Page: 14 / 67

INTRODUCTION
PRS-330 Series
2
direct resistance substitution as well as RTD
(Resistance Temperature Detector) simulation. It
allows for higher precision and tight tolerances.
The PRS-330 is a precision resistance source
with excellent characteristics of accuracy,
stability, temperature coef
fi cient, and power
coef fi cient. It is direct reading without
the need to subtract “zero resistance.”
The PRS-330 offers the option of true
4-wire Kelvin measurement for calibration
applications and 2-wire mode for use
in series as a substitute resistor and for
RTD applications. The front panel display
indicates the mode selected: 2-wire or 4-wire.
There are 4 pre-programmed RTD
resistance tables, and others may be added
by the user. The controller allows for
other convenient programmed features.
The unique design makes adjustment of the
PRS-330 for calibration semiautomatic. An
internal calibration routine guides the user to
perform measurements using only a precision
ohmmeter and enter the measured values into
the PRS-330. No other standards are required.
IET Labs offers the PRS-DMM Self Adjusting
Software which works with the PRS-330 and
Fluke 8508A or Keysight 3458A to automate
this adjustment process and eliminate the
need for a technician to manual enter the
resistance values manually into the PRS-
330 See Chapter 9 for more information