General purpose portable Four Point Probing System for measuring sheet resistance or volume resistivity. This system includes the Jandel Cylindrical Probe along with the RM3000+ Test Unit.
About the RM3000+ Test Unit
- The RM3000+ Test Unit is a specialty electronics instruments designed specifically for the four point probe meas-urement. It features high accuracy, an excellent range, and many features which simplify the four point probing measurement. The following are features of the RM3000+ Test Unit: The measurement range of the RM3000+ Test Unit is from 1 milliohm-per-square (10^-3) to 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 RM3000+ 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 RM3000+ reads-out directly in ohms-per-square (or toggle to millivolts) without requiring the use of the software or a PC.
- The RM3000+ 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 RM3000+ 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 RM3000+ 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. More about reversing the input current:
reversing_current.pdf
About the Jandel Cylindrical Probe
The Jandel Cylindrical probe is built to a high level of mechanical accuracy as are all Jandel four point probe heads. Specifications for radii, spacing, planarity, and spring load are verified by calibrated instruments including a video inspection system, an optical interferometer, and an electronic force gauge. Each probe tip is guided by upper and lower jeweled needle guides. Additional information about probe quality can be found in the Jandel probe head application notes.
| PROBE SPACING | 25 to 50 mils (0.635mm to 1.27mm) in 5 mil (127 micron) increments, also 1.0mm and 1.59mm. 20 |
| TOLERANCE | +/-0.01 mm |
| ARRANGEMENT | Linear or Square array |
| NEEDLES | Solid Tungsten carbide Ø 0.40 mm (Ø 0.30 mm for close-spacing) 45 degree included angle, phosphor-bronze connecting ligament |
| OTHER MATERIALS | 50% osmium alloy tips available |
| RADII | 12.5 μm min. to 500 μm max. polished with 2 μm diamond |
| RETRACTION TO INSULATING PAD | 0.5 mm |
| PLANARITY | +/- 0.025 mm or better |
| LOADS | Low: 10-30g, Medium: 30-60g High: 60-150g |
| LEADS | 4-way cable Teflon insulated (screened on cylindrical) |
| ELECTRICAL LEAKAGE | 1013 ohms resistance between needles at 500 volts |
Jandel Engineering RM3000+ Test Unit Four Point Probe Measurement Electronics
The RM3000+ Test Unit reads out directly in ohms-per-square (or millivolts), and it includes a USB connection and PC software to save the data as either sheet resistance or as volume resistivity. Information regarding the PC software can be found here:
https://four-point-probes.com/rm3ar_instructions.pdf
Cylindrical Probe with Small Nosepiece Shroud combined with the RM3000+ Test Unit*
*Inclues a 1 meter long cable
Small Shroud Installed on Cylindrical Probe Nosepiece
Cylindrical Probe Pressure Adjustment
The Cylindrical Probe has spring loads which are user adjustable within one of three ranges. The probe shown here has been factory set to 100 grams per tip, however, the user can increase the load to as high as 150 grams per tip or as low as 60 gram per tip by moving the red Teflon knob towards either the “H” for higher or towards the “L” for lower.
Downloads
![CYL Probe combined with the RM3000+ meter, brochure [402K PDF file]](https://four-point-probes.com/images/pdf.jpg){kind=small}
We Recommend
If you do not require as great a measurement range as the RM3000+ Test Unit provides, you might be interested in the:
CYL Probe with HM21 Hand Held Meter
Four-Point-Probes is a division of Bridge Technology. To request further information please call Bridge Technology at (480) 219-9007 or send e-mail to Joshua Bridge at: sales@bridgetec.com
