PROGRAMMABLE RESISTANCE CAPACITANCE INDUCTANCE DECADE

PRS Programmable Resistance Capacitance Inductance Decades.
A broad range of laboratory grade decade substituters for applications requiring a cost effective programmable impedance unit controlled manually and by a computer.

• Wide range and resolution:

  • Resistance: 1 mΩ to 100 MΩ

  • Capacitance:1pF - 1000μF

  • Inductance: 1mH - 10 H

Dual PZS Resistance
Multiple control mode:
Thumbwheel switch
IEEE-488.1
IEEE-488.2 (w/SCPI)
RS232C (w/SCPI)
National Instruments LabVIEW hardware and software tools available
Special RTD and custom configurations
High power versions
Programmable "open circuit" and "short circuit" states optional

Choice of Performance:
PRS-200 Series - economical 1% accuracy
PRS-201 Series - laboratory 0.1% accuracy
PRS-202 Series - high accuracy to 0.01%
PRTD Series - programmable RTD simulation.
Package Configuration: Convenient
standard 19" rack mounting or more portable
benchtop versions are available. 
Both single and dual units are available.
Low thermal emf: Specially selected relays
along with tellurium copper binding
posts insure minimum thermal emf drift.
High Power: Power of 100’s of watts and
high current options are available.

Combinations: Dual or combination
resistance-capacitance-inductance
models may be configured
Special Requirements: High voltage
nonstandard values, ultra low tempco o
special programming needs can be accommodated.
Rear Outputs: Single or dual front and
rear outputs are available with option RO.
Wide choice of impedance ranges:
resistance, capacitance and inductance
of up to 10 decades may be specified.
Resistance may range from 1 m to 100 M.

• LabVIEW Drivers for IEEE-488.2 and RS-232 Versions

• Special RTD and custom configurations

• High power versions

• Programmable "open circuit" and "short circuit" states optional

• Desktop and 19" Rackmount enclosures

• Dual / Combo rackmount models ( examples: dual resistance, resistance & capacitance )

• Manual thumbwheel operation or programmable digital input, RS-232 or GPIB (IEEE-488.2 interface)

• effective programmable impedance unit controlled manually and by a computer

• Windows tools and IEEE-488 interface software and hardware available

PRTD: Low resistance versions with a fixed minimum resistance setting (³4 W or specified by customer) are suitable for RTD (Resistance Temperature Detector) simulations. 
This design virtually eliminates the effect of zero resistance and relay contact resistance, providing the specified absolute accuracy over its entire range.
High Power Options: Power dissipation requirements of up to 10s of Watts can be accommodated.
Short Circuit (SC) and Open Circuit (OC) Options: Optional short circuit and open circuit modes of operation respectively. 
These states are controlled only in the REMOTE programming mode.
OC or Open Circuit operation gives the user an open circuit immediately in series with the HI binding post. SC or Short Circuit operation gives the user a short circuit across the HI and the LO binding posts 
The short circuit impedance is very small, <20 m or as low as 5 m. 
This is lower than the regular zero resistance setting. In both these cases, the underlying resistance setting is unaffected and may still be controlled.

• Thumbwheel:  Standard feature on all models.

• BCD: (Binary Coded Decimal): Use external digital I/O lines to set
  decade values individually. Requires 4 TTL lines per decade.
  The user provides his own control circuitry

• IEEE.1: Our original computer interface which supports the IEEE-488.1 or IEEE-1978 protocol is still available to allow you to maintain compatibility with your legacy hardware / software
  investment. This may also be a more economical solution for your control needs

• IEEE: This is the most popular, worldwide interface standard for test and measurement equipment. With this option, the PRS is compliant with IEEE-488.2 and SCPI 1994.0. Features *IDN and cal date query, allowing you to improve your instrument and cal tracking capabilities. GPIB addressing is controlled via DIP switches or commands on the GPIB bus.

• RS232: This interface conforms to EIA-STD-RS-530; with a 25 pin DTE interface. Choose from factory configurable RS232 or RS422/RS485 differential modes.
  The PRS is a standard DTE device in RS232 mode. Typical connection to a controlling computer is made via a null-modem cable. This is the default mode if not specified.
  Specify RS422/485 mode when the PRS is in a remote location or when communications port capacity is at a premium. The RS422/485 specification uses differential signalling to increase
  transmission distances and to reduce communications errors in noisy environments. When in 485 mode, the PRS is a listenonly device and configurable to addresses 0-15.
  The internal 422/485 mode eliminates the need for external signal adapters on the PRS.
  
  When equipped with any remote control functionality, the PRS front panel switch determines if REMOTE mode is enabled. Regardless of remote control type, setting the front panel switch to the LOCAL position always disables the remote control “set” value. Use of the IEEE GTL (go-to-local) command message returns the PRS to LOCAL mode and the PRS output value to the thumbwheel setting. GTL is an IEEE specific function and not applicable to Serial or BCD equipped units.
  Supported commands include: *IDN?, *CLS, *ESE, *ESE?, *ESR?, *IDN?, *OPC, *OPC?, *PSC, *PSC?, *RCL, *RST, *SAV, *SRE, *SRE?, *STB, *TRG, *TST? and *WAI.
  When using the PRS in an environment where traceability is required, test software can query the ‘*IDN’ and ‘CALibrate:DATe’ registers at the beginning of each test sequence to record equipment serial numbers and check the calibration date against the current date.

* These specifications are dynamic switching limits. The maximum voltage, power, or current which may be applied at any particular resistance setting may be higher as long as the setting is unchanged, or the unit is switched dry.