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The RM3-AR Test Unit is a specialty electronics instruments designed specifically for the four point probe measurement. It features high accuracy, an excellent range, and many features which simplify the four point probing measurement. The following are features of the RM3-AR Test Unit:
- The measurement range of the RM3-AR Test Unit is from 1 milliohm-per-square (10^-3) up to 5 x 10^8 ohms-per-square with 0.3% accuracy. The volume resistivity range is from 1 milliohm-cm (10^-3) up to 10^6 ohms-cm.
- The RM3-AR includes PC control software which can be used for data logging (storing data in the CSV format) and measurement conversion to ohms-per-square or ohms-cm.
- The RM3-AR reads-out directly in ohms-per-square (or toggle to millivolts) without requiring the use of the software or a PC.
- The RM3-AR has onboard non-volatile memory so that up to 50 measurements can be stored internally and then downloaded and saved all at one time using the software. Alternately, each measurement can be saved to a PC as it is made.
- The RM3-AR has an auto-range button that can be used to automatically determine the optimum input current for a given material without using the trial and error method.
- The RM3-AR has forward (FWD) and reverse (REV) buttons to reverse the direction of current flow. A common way to determine if a measurement is valid is to reverse the direction of current flow and then check to see if the forward and reverse voltage readings correlate well, i.e., the values should be similar, but with the reverse current voltage being a negative value.
SPECIFICATIONS: Superior Current Source
- 10nA to 100mA (99.999mA) current source selectable in steps to 5 decimal place resolution
- Current set numeric keypad
- 4 default preset current programs (user programmable)
Superior Inbuilt DVM
- Input Impedance 1,000,000,000,000 ohms
- Input Bias current 4pA
- Two Ranges: Hi - 0 to 150mV and
Low - 0 to 1250mV
- 150mV Range Accuracy: 0.2% +/- 5uV resolution (10uV or 1uV) range
- 1250mV Range Accuracy: 0.2%+/-100uV resolution (100uV Ohms/Square)
- Rapid Zeroing null function for DVM
Features
- 28 Key high quality Keypad
- 16x2 line LCD Display for simultaneous indication of Set Current and either Ohms/Sq or mV
- Intuitive operation
- Microprocessor controlled
- Reduced Footprint
- Robust Attractive ABS Case
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(Click image to see a larger photo)
Shown here displaying result in
ohms-per-square
(Click image to see a larger photo)
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- Accurately measures down to 10's of milliohms/square without external meter
- 4mm socket facility to connect an external meter
- RS232/USB connectivity for control and for collecting data in CSV format
- Automatic compliance voltage limit protects your sample which reduces maximum voltage as higher currents are set 5-40V
- Warning messages when compliance limit is reached, or DVM input exceeded
- Self test facility
- Flash upgradeable software
- CE Marked
- AD/DA converters and amplifiers for the DVM and setting the Current source and DVM, are Burr Brown 110V or 240V operation (selectable)
Viewing and Storing the RM3-AR Measurement Data
1) The RM3-AR Test Unit displays sheet resistance on the front panel which can be recorded manually, or
2) Data can be saved by pressing the "save" button on the RM3-AR front panel (with or without a PC connected), in which case the data is stored internal to the RM3-AR's on-board NVM memory (data from up to 50 measurments), or
3) Data can be saved directly to a PC file by using the software while the RM3-AR is connected to a PC, in which case you click on the "save" button on the graphically reproduced image of the RM3-AR front panel which will be on the PC screen.
Data stored on a PC is saved in CSV format, which is a file type that can be opened with Excel. A example of the files that can be stored for both sheet resistance and volume resistivity can be found here: csv_file_examples.pdf
Four-Point-Probes is a division of Bridge Technology. To request further information please call Bridge Technology at (480) 988-2256 or send e-mail to Larry Bridge at: sales@bridgetec.com |
