1
PRS-812 Resistance Meter
I. Introduction & Description
The PRS-812 Resistance Meter makes precision resistance
measurements from 0.1 up to 1.0x10
12
ohms with an overall
measurement tolerance of
5%. It is capable of measuring up to
2.0x10
14
ohms with tolerance depending on procedures and
conditions. The PRS-812’s wide range and close tolerance make it
the ideal ESD Auditing instrument for measuring resistance to a
variety of ESD and general industry specifications. It is operated
by programmed microprocessors that control the instrument’s
measurement process, resistance auto ranging, test voltage
selection, electrification periods, and display functions. It can be
operated in either fully automatic or manual modes, or a
combination of automatic and manual modes.
The PRS-812 is unique in that it records and stores up to 80
resistance measurements in its own non-volatile memory register.
Stored data is summarized with a push of a button.
Its accuracy is based on its ability to rapidly make several
measurements each second, and average them until a stable set of
eight measurements, all within 5% tolerance, are obtained. The final averaged data is displayed as
the resistance measurement. Typically, measurements at less than 1 ohm are within 5% of
tolerance, and those between 1.0 and 1.0x10
12
ohms are within 0.5% of laboratory references.
While quite sophisticated in design, the PRS-812 Resistance Meter is easy to use and extremely
helpful in making accurate ESD auditing measurements, or general resistance and continuity
checks.
CAUTION
To avoid electrical shock or damage to the PRS-812 Resistance Meter, read this
manual completely before installing batteries or using the instrument
A. Measurement Applications
The PRS-812 Resistance Meter is designed to measure resistance characteristics of
electrostatic discharge (ESD) control materials and products to current ESD industry standards,
including:
Wrist Straps (ESD S1.1)
Garments (ESD S2.1)
Flooring (ESD S7.1)
Worksurfaces (ESD S4.1)
Common Point ESD Grounds (ESD S6.1)
Footwear
Seating
Workstations
Equipment
Carts
Production
Aids
Packaging (ESD S11.11, ESD S11.12 & ASTM 257) Material-Handling Containers
ESD Program Standard ANSI/ESD 20.20 & European Norm EN 00015
B. PRO
STAT
PRS-801 Resistance System Components:
The PRO
STAT
PRS-812 Resistance Meter includes the following items
1.
PRS-812 Resistance Meter Instrument with 2 each 9V alkaline batteries
2.
Two 10-foot leads (PRS-800 L) for general audit measurements up to 1.0x10
12
ohms.
3.
One heavy duty, black “Bulldog” clip (PRS-801 BC)
Figure 1:
PRS-812 during Power Up