Prostat PRF-911, Operation Manual

PRF-911 Concentric Ring

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insures standard specimen size and minimizes fringe voltages that may 
effect the surface resistance measurement. 
 

c. In the auditing process, one often must obtain measurement of a large 

piece of material without cutting sample into a proper size specimen. 
This type of measurement is considered "indicative"; however, it is 
sufficient for obtaining a reasonable indication of the material's surface 
resistance PROVIDING only one layer of the material is measured as 
described below. 
 

3. PRF-911 Concentric Ring Fixture Preparation 

a. Install the BNC/Dual Banana adapter on the PRF-911 fixture 
 
b. Check proper battery level of the PRS-801 or PRS-812 Resistance Instrument 

and connect the meter leads to the PRF-911 Fixture as follows: 

(1) Install the instrument negative (-) lead of the PRS-801 or PRS-812 

Resistance Instrument to the RED BNC adapter receptacle connected to the 
center INNER RING electrode (D1). 

(2) Install the positive (+) lead to the BLACK receptacle connected to the OUTER 

RING electrode (D2). 

(3) To enhance the accuracy of the measurement, connect a 

GREEN auxiliary ground lead to the BNC adapter fixture ground 
receptacle, and the other end of the lead to the instrument’s ground 
reference, if so equipped. 
 

c. Place the PTB-920 Dual Test Bed on a worksurface with the insulated 

acrylic surface facing UP . 

Figure 10: PRF-911 Fixture Preparation

Instrument Ground Reference 

Positive ( + ) Test  
Voltage Power Lead 

Negative ( - ) Sensing Lead