A broad range of programmable resistance decade boxes for applications
requiring a programmable impedance unit, controlled manually and by a computer
via an IEEE-488 or an RS-232 interface.
- Wide range and resolution: 1 mΩ to 100 MΩ
- Available at accuracies of : 0.01%, 0.02%, 0.05%, 0.1%, 0.5%, and 1%
- LabVIEW Drivers for IEEE-488.2 and RS-232 Versions
- effective programmable impedance unit controlled manually and by a
computer
- Special RTD and custom configurations
- High power versions avaialable
- Programmable "open circuit" and "short circuit" states optional
- Desktop and 19" Rackmount enclosures
- Dual / Combo rackmount models ( examples: dual resistance, resistance
& capacitance )
- Windows tools and IEEE-488 interface software and hardware available
- Contact us for Custom or Built to Order Models
The PRS Series is a broad line of high programmable
decade boxes. They provide direct resistance substitution as well as RTD
(Resistance Temperature Detector) simulation, in a wide selection of ranges,
tolerances and ratings.
The PRS programmable resistance decade box is a
precision resistance source with excellent characteristics of stability,
temperature coefficient, and power coefficient. High dynamic ranges are
available, starting as low as 1 mW, and extending to as many as 10 decades.
These features combined with a low virtually constant zero resistance make for
very versatile instruments.
The PRS Series programmable resistance decade
box features two optional special settings. An "open circuit" and a "short
circuit". These modes are useful for obtaining reproducible transitions between
settings, i.e. break-before-make or to short between settings. The "short
circuit": setting also provides a reduced zero resistance.
Operation is
both local using convenient direct-reading front panel thumbwheel switches, and
remote with optional parallel RS-232, or IEEE-488 interfaces.
Both can
provide an optional extra "10" position for each decade.
The PRS Series
programmable resistance decade box employs very low resistance, low thermal emf
relays with gold-clad silver-alloy contacts. A special design keeps contact
resistance to a minimum. The gold plating keeps the silver contacts from
becoming tarnished when unused, or when only low currents are passed through
them. This is most often the case when only minute test currents are drawn by
digital multimeters and other test instruments. Contact resistance remains low
and repeatable.
The programmable decade box employees, high-quality
gold-plated tellurium-copper five-way binding posts serve to minimize the
thermal emf effects, which would produce errors in dc resistance measurements.
All other conductors within the instrument, as well as the solder employed
contain no metals or junctions that could contribute to thermal emf
problems.
With a resolution as low as 1 mΩ and a maximum available
resistance of over 100 MΩ, the PRS Series Series may be used for exacting
precision measurement
applications requiring high accuracy, good stability,
and low zero resistance. They are suited for automatic and manual calibration
and testing, simulation of RTD'S, programmable loads, and many other laboratory
and industrial applications. The PRS Series programmable resistance decade box
may be rack mounted to serve as components in measurement and control
systems.
PRTD Version: Low resistance versions with a
fixed minimum resistance setting (4 Ω or specifi ed by customer) are suitable
for Programmable 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.
BASIC SPECIFICATIONS
Standard Models
| Model |
PRS-200 |
PRS-201 |
PRS-200W |
PRS-201W |
PRS-202 |
PRS-202W |
PRTD-X-6-0.001 |
| Type |
Resistance |
Precision Resistance |
Wide Range Resistance |
Wide Range Precision Resistance |
High Precision Resistance |
Wide Range High Precision Resistance |
Programmable RTD Simulator |
| Accuracy |
1% +70 mΩ |
0.1%+ 30 mΩ |
1%+ 70 mΩ |
0.1%+ 30 mΩ |
0.05% + 15 mΩ |
0.05% + 15 mΩ |
0.01% + 15 mΩ |
| Decades |
7 |
7 |
9 |
9 |
7 |
9 |
6 |
| Range |
0 - 10 MΩ |
0 - 10 MΩ |
0 - 100 MΩ |
0 - 100 MΩ |
0 - 10 MΩ |
0 - 100 MΩ |
4-10,003.99 Ω |
| Resolution |
1 Ω |
1 Ω |
0.1 Ω |
0.1 Ω |
1 Ω |
0.1 Ω |
0.001 Ω |
| Type of Components |
Resistance wire for 0.1 Ω steps and under; metal film for 1 Ω steps
and over. |
Resistance wire for 0.1 Ω steps and under; wirewound, sealed
non-inductive resistors for 1 Ω steps and over. |
| Max. Load* |
0.5 A, 200 V (dc + ac peak), 0.2 W/step, 2 W unit, whichever
applies first.* |
3 A, 200 V (dc + ac peak), 0.5 W/step, 4.5W/unit, whichever applies
first.* |
| Residual Impedance |
<450 mΩ |
<600 mΩ |
<100 mΩ |
<140 mΩ (typically <100 mΩ) |
Absolute Value |
* These specifi cations 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.
Switching time: < 4 ms per change; < 7 ms for
≤0.05% units
IEEE: GPIB standard 24 pin connector, conforms
to IEEE-488.2; SCPI 1994.0 command set; Hardware or software configurable
addressing range of 0 to 30. .
RS232: 25 pin male DTE
interface conforms to EIA-STD-RS-530; SCPI 1994.0 command set; data rates from
300 to 115200 bps.
DRIVERS - TEST KEYBOARD
To aid the user in operating the PRS/PCS/PLS, Two “Keyboard” Controller
programs - the easiest way to control GPIB or RS232 devices without writing a
program - are available from IET. This Keyboard programs automatically finds
your device at start-up and it lets you enter just the data that you want to
send to the device. This program works with ICS, Measurement Computing and
National Instruments controllers.
For GPIB IEEE-488.1 and
IEEE-488.2 interface
Download ICS_GPIBkybd_Install.zip
Unzip the file and follow instructions to install. Open the
application. You may use the Find Listeners button to
confirm that the PRS unit is recognized. Other instruments may also be
recognized at this time.
Enter and set the Address to
the PRS address. Use the window to send a command string to the
PRS, where the command string is constructed as described in the operating
manual. A command string might be, for example:
SOURce:DATA
resistance string
For Serial RS-232
interface:
Download:
ICS_Serkybd_Install.zip
Unzip the file and follow
instructions to install. Open the application. Initialize the COM PORT and
use the Device Command window to send a command string to the
PRS, where the command string is constructed as described in the operating
manual. A command string might be, for example:
SOURce:DATA
resistance string
