PRS-812 Resistance Meter Set
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  • PRS-812 Resistance Meter Set
    Portable, precision resistance measurement from 0.1 to 9.9 x 1012 ohms.
    • Accurate Wide Range Resistance Measurements: 0.1 Ω to 9.9x1012 Ω with overall nominal accuracy <±5%; Maximum range 1.0x1014
    • Variable Voltage 0.1 mv to 9.99 V for low resistance measurements
    • Constant Test voltages 10V and 100V for specification measurements to meet international and domestic ESD measurement standards
    • Auto Resistance Range Control
    • Auto Test Voltage Control
    • Automatic Electrification Period adjustment to obtain most accurate measurements
    • 80 Data Point Memory
    • Fast and Flexible
    Wide Range. Accurate. Portable.
    Wide Range. Accurate. Portable.
    The PRS-812 is a wide range portable constant voltage resistance instrument designed for dedicated ESD Auditors and professionals. The PRS-812 is a cost effective choice for those ESD professionals who require outstanding accuracy and performance, but do not require data downloading.

    Like its big brother the PRS-801, the PRS-812 has an outstanding performance combination of measurement speed, wide range and accuracy. Its constant test voltage system is extremely stable and consistent with lab level, bench top instruments.

    Measurement Range
    Measurement Range: Three Instruments in One!

    The PRS-812’s accurate wide range of 0.1 to 9.9x1012 ohms, with capabilities to 1.0x1014 Ω, offers exceptional flexibility in measurement applications. In effect, it is 3 instruments in one because it functions as:

    1. A low resistance range instrument for measurements from 0.1 to 1.0x104 ohms. Most competitive instruments do not measure accurately at or below 1.0x103 ohms. Thus, the typical ESD practitioner must carry a DMM for low resistance checks of ground connections.

      To ensure-field accuracy, the PRS-801CC Calibration Shunt is used to confirm and adjust the accuracy of its 0.1 to 10 ohm resistance range.

    2. A wide range audit instrument that meets and exceeds requirements for ANSI/ESD S20.20 and TR53 periodic verification (audit) procedures from 1.0x103 to 1.0x1011 ohms.

      Measurement guidelines require accurate measurements from one decade below to one decade above the resistance requirements of a facility’s ESD program. The PRS-812 easily exceeds this requirement by as much as 2 decades, depending on program requirements.

      Making Cart, Floor, Chair or Worksurface Resistance Measurements
    3. Precision high resistance measurement instrument for Packaging
    4. Precision high resistance instrument for Packaging measurements to S541 Standards, for material and product testing, and acceptance verification.

      Few competitive instruments can measure accurately up to or beyond 1.0x1011 ohms, while the PRS-812 comfortably measures up to 1.0x1012 ohms.
    Measurement Flexibility
    Measurement Flexibility

    Connect to Virtually any 2-wire Fixture or electrode configuration.

    The PRS-812’s simple ¾ inch terminal spacing provides connectivity to a variety of electrodes and fixtures.

    • Terminal design allows use of mechanically shielded or non-shielded banana plug leads

    • BNC adapters with ¾ inch spacing mount directly to the PRS-812 terminals for measurements with wide range probes and fixtures

    Measurement Speed: Electrification Period
    Measurement Speed: Electrification Period

    Along with the PRS-801, the PRS-812 is one of the fastest measurement instruments in today’s precision measurement market. Laboratory tests confirm the PRS-812 can measure from 0 to 1.0x1012 ohms in 2.5 seconds. Thus, its specified electrification period (EP) is 8 seconds in accordance with ANSI/ESD STM 11.11 Surface Resistance of Planar Materials. Furthermore, its EP is automatically adjusted to insure a stable measurement is displayed.

    Multiple Modes of Operation
    Multiple Modes of Operation
    The PRS-812 has Automatic, Manual and Auto-Manual operational modes, plus exponential display or standard numeric display in Ω, KΩ, MΩ, GΩ and TΩ. It’s easy to use and read. Measurements are summarized in decades using multiple LED’s from <103 to >1012.

    Constant Test Voltages

    PRS-812 has three Test Voltages ranges that provide stable test references for repeatable measurements. In AUTO mode, the instrument automatically selects the proper test voltage for the resistance being measured.

    1. <10 Volts: 0.1 to 9.99x103
      <10V is variable across this range from 0.1 mV to 9.99V
    2. 10 Volts – Constant Voltage under Load
      Constant at 1.0x104 to 9.99x105
      Target calibration is to within ± 0.01 volt, and always within ±1%
    3. 100 Volts – Constant Voltage under Load
      Constant at 1.0x106 to 1.0x1012
      Target calibration is to within ± 0.01 volt, and always within ±0.1%

    High Quality Test Leads
    High Quality Test Leads
    Prostat’s 10 foot test leads supplied with each PRS-812 consist of hundreds of fine strands of copper that offer flexibility and accuracy. The outer insulation of each test lead is high grade silicon with an extremely high resistance to minimize measurement errors. These leads are designed for convenient audit measurements in the manufacturing environment up to 1.0x1012 Ω.
    Measurement Convenience & Calculations
    Not only does the PRS-812 make accurate measurements quickly, it stores up to 80 measurement data points in its memory. Press the RECORD/RECALL button to retrieve information and calculate attributes of the stored data.

    • Minimum Recorded Measurement
    • Maximum Recorded Measurement
    • Average of all Recorded Measurements

    Did you store a message in error? It can be simply selected and removed from the memory register without removing other data points.

    The PRS-812 is a convenient, accurate instrument that meets virtually every measurement requirement in the ESD standards world.

    Technical Specifications


    Optimal Resistance Range from 0.1 (1.0E-1) Ohms to 9.9 Tera ohms (9.9E+12 ohms).


    Automatic Mode (Default): 0.01 volts to 10 volts Variable 1.0E-1 to 1.0E+4 Ohms

    Constant Voltage:
    10 volts: ± <0.2 volts 1.0E+4 to <1.0E+6 Ohms
    100 Volts: ± <2.0 volts 1.0E+6 to >1.0E+12 Ohms

    Manual Mode: 0.01 volts to 10 volts Variable 1.0E-1 to <1.0E+5 Ohms
    10 volts: ± <0.2 volts 1.0E+2 to 1.0E+9 Ohms
    100 volts: ± <2.0 volts 2.0E+5 to >1.0E+12 Ohms


    Overall: ± <5% at ambient conditions (at 23°C and 30% Rh).

    Specific Range Tolerances:
    1.0E-1 to 1.0E+1 ohms: ±5% Corrected for Test Lead Resistance
    1.0E+1 to 1.0E+12 ohms: ±2.0% with 10-foot Test Leads
    1.0E+12 to 2.0E+14 ohms: <±40%


    Multi-function 2-5/8” x 1-5/8” Liquid Crystal Display with 0.5" digit height.
    Displays 3-1/2 digits in Ohms, or 1.0EXX in exponential format.
    Ohms Display indicators: Ω, KΩ, MΩ, GΩ and TΩ. Includes 19-segment analog scale (1-10 with 0.5 indication) with x1, x10, & x100 multipliers.
    Number of Data Points in Memory (0 – 80).
    Automatic Electrification Time (seconds), or Time required to Manually obtain steady state measurement.
    Displays data HOLD, BATTERY status, MIN, MAX, AVG, REC and Test Voltage (<10, 10, or 100 V)


    14 Color LED’s from <103 to >1012 ohms.
    Colors (RED, GREEN, YELLOW/ORANGE, or Blank/OFF)


    Times measurements in Seconds up to 99 seconds (Displayed on LCD)


    Register stores up to 80 data points (MEM # Displayed after RESET)


    Resistance Range Electrification Period
    0.1 to <1.0E06 Ohms <3.0 seconds
    1.0E06 to <1.0E12 8.0 seconds
    1.0E12 and greater 15.0 seconds

    Note: Electtrification period varies based on conditions & material stability.


    Two 9-VDC alkaline batteries. Nominal battery life 25 hours in Automatic
    Greater than 35 hours in Automatic Manual


    4.0" wide x 6.0" long x 2.0" deep.


    22 ounces, with batteries


    <4 ma @ 100 Volts


    2 Triangular Arrow Buttons: UP ­ and DOWN ¯.
    Select Resistance Range in single decades in Manual and Automatic/Manual modes.


    Manual Selection of <10, 10 or 100 volts in Manual Mode


    Turns Memory Register ON if OFF. Provides access to all data in Memory Register.
    Calculates and Displays Minimum, Maximum and Average of data stored in Memory Register.


    Erases all data in Memory Register; if in HOLD mode, discards the most recent Held Value


    Power-up, perform functional & Battery tests. Power down if ON.


    Displays GOOD on LCD if acceptable voltage or Lo if unacceptable


    Enters (saves) data into Memory Register, Clears HOLD and Display.


    Begins measurement sequence.


    ON/OFF Switch isolates batteries from instrument circuits for storage & transport


    Auto Mode:
    The instrument automatically selects and adjusts test voltage, resistance range, electrification period, then displays and Holds the measurement. The displayed measurement is the average of eight consecutive measurements, all within ±5% of each other. The measurement is “saved” in the Memory Register by pressing RESET. The instrument is now ready for the next measurement.

    Manual Mode:
    Allows operator to select resistance decade, test voltage and electrification period (EP).

    Automatic Manual:
    Same as Auto Mode with following exceptions:

    - Allows operator to select starting resistance decade

    - Always starts measurement from the last measurement value without resetting to zero. This extends battery life & speeds up measurement sequence.


    In RECORD mode, the PRS-812 stores up to 80 measurements, and on demand will calculate and display the Minimum, Maximum and Average measurements stored in the register.


    Designed for Intermittent use. Not intended for continuous use or production applications.


    User Manuals

    Release Date

    1,698 KB

    Data Sheets

    Release Date

    1,078 KB