Prostat PRF-911, Operation Manual

PRF-911 Concentric Ring 

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g. Select Ohms Mode by pressing “Mode” button once. 
  

1.  Push Test Button 
2.  Resistance Should be < 10 

Ω

(1) If proper connection is made through the BLACK receptacle to 

the outer ring, and the outer electrode is in contact with the 
metal test bed, the PRS-801 or PRS-812 will indicate low resistance is < 10 

Ω

(2) If proper continuity indication confirms positive contact of the 

outer electrode, the fixture check is completed. 

(3) If no continuity indication appears, clean the electrode surface with 70% 

solution of IPA , test the PRS-801 or PRS-812 per its operating instructions 
and repeat the procedure. (i.e. Install the supplied shunt and test the low 
range. Check the cable & connections as well.) 

IV. General 

Operation 

A. Surface Resistance Measurement per ESD STM 11.11-2001. Note that this procedure 

replaces surface resistivity measurements of electrostatic discharge control materials 
previously conducted using ASTM D-257. The following procedure is used to measure 
surface resistance in ohms, and convert it to ohms/square if necessary. 

1. Items necessary for this procedure 
 

a. PRF-911 Concentric Ring Fixture 
 
b. BNC/Dual Banana Adapter 
 
c. PTB-920 Dual Test Bed 
 
d. PRS-801 or PRS-812 Resistance Instrument and test leads 

e.One PROSTAT five pound NFPA electrode 

f. One GREEN auxiliary ground reference lead or PRS-801 High Resistance Lead 

harness if using PRS-801 Instrument. NOTE: Connection to instrument ground 
reference is recommended for measurements of 1.0x10 

Ω

 and higher 

g. Clear worksurface 

2. Specimen Preparation for Surface Resistance measurement 
 

a. This procedure is designed specifically for measuring planar (flat) 

surfaces having relatively smooth surfaces. 
 

b. In the laboratory environment, sample preparation usually includes 

cutting a 3x5 inch specimen of the sample material to be tested. This