Prostat PRF-912B, User Manual

10

Rev. A  / November 2005

PRF-912B Miniature Concentric Ring Fixture Set

4.  Depending on your resistance instrument select 

either 10V or 100V test voltage. 

5.  Measure PRF-912B probe resistance while posi

-

tioned in the PRV-913B Verifier. Resistance should 

be 1.0x10

6

 ohms ±1%.

D.  Basic Measurements Using the PRF-912B Micro Probe

1.  Place material to be measured on an insulated 

test bed, the clean insulated surface (Black, la

-

beled side) of the PTB-920, or an insulated acrylic 

plate. 

2.  Position the PRF-912B vertically directly over test 

area and lower it until the spring loaded center 

electrode makes direct contact with the material 

under test.

3.  Apply sufficient pressure on the probe until the center and outer spring loaded electrode are 

partially compressed while in contact with the test material.

IMPORTANT NOTE

Adjust probe pressure to insure that the electrode springs are controlling the probe’s con

-

nection with the material’s surface and that the springs are not fully compressed against 

their stops. This will insure reproducible measurements.

4.  Select appropriate instrument test voltage and initiate resistance measurement. ESD Associa

-

tion S11.11 test voltage guidelines for measuring packaging materials are as follows:

a.  For material resistance measurements of less than 1.0x10

4

 ohms, use <10 volts.

b.  For measurements of 1.0x10

4

 to <1.0x10

6

 ohms, use 10 volts.

c.  For measurements greater than 1.0x10

6

 ohms, use 100 volts 

NOTE:

 For optimal performance and accuracy, use the Prostat PRS-801 Resistance System 

in its AUTOMATIC Mode (either Default Mode 1 [Ohms], or Mode 2 [Exponential 1.0EXX/

Ohms] display). AUTOMATIC Mode will control test voltage, resistance range adjustment 

and electrification period automatically.

Figure 9: Insert PRF-912B Fixture into PRV-

913B Verifier and Measure Verifier Resis

-

tance