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The PRS-812 is a constant voltage, wide range ohmmeter with data logging ａnd calculating capabilities. Fully portable ａnd battery operated, the PRS-812 measures resistance from 0.1 to 1.0x10¹² ohms with measurement accuracy of ±5%. It can be operated in fully Automatic, Automatic,-Manual ａnd Manual modes.

This sophisticated instrument digitally displays measurements in ohms, kilohms, megohms, gigohms ａnd terohms, ａnd in exponential format, e.g., 1.5E8.

It simultaneously displays data with a fully synchronous analog scale using x1, x10 ａnd x100 multipliers, ａnd a bank of color coded LED\＇s (10³ to 10¹² Ohms). Multiple test voltages include 0.01-10V, constant 10V ａnd 100V ranges, which may be selected automatically by the instru-ment to comply with industry measurement practices, or manually by the operator.

The PRS-812 records ａnd stores up to 80 measurements, ａnd calculates minimum, maximum ａnd average of all stored data.

Fully automatic, the PRS-812 controls test voltage, resistance ranging ａnd electrification period to make the most accurate ａnd repeatable measurements available to ESD Auditors ａnd technicians.

Range: Optimal Resistance Range from 0.1 (1.0E-1) Ohms to 1 Tera ohms (1.0E+12 ohms). Maximum resistance indication: 200 Tera ohms (2.0E+14 ohms).

Test Voltages: Automatic mode Default: 0.01 to 10 volts Variable 1.0E-1 to 1.0E+4 OhmsConstant Voltage 10 volts ± 0.2 volts 1.0E+4 to 1.0E+6 OhmsAt 10 100 Volts 100 volts ± 2.0 volts 1.0E+6 to 2.0E+14 Ohms

Manual Mode: 0.01 to 10 volts Variable 1.0E-1 to 1.0E+4 Ohms10 volts ± 0.2 volts 1.0E+2 to 1.0E+9 Ohms100 volts ± 2.0 volts 1.0E+5 to 2.0E+14 Ohms

Accuracy: Overall: ± 5% at ambient conditions (at 23oF ａnd 30% Rh).Specific Range Tolerances:1.0E-1 to 1.0E+1 ohms: ±5% Corrected for Test Lead Resistance1.0E+1 to 1.0E+12 ohms: ±2.0% with 10-foot Test Leads1.0E+12 to 2.0E+14 ohms: ±40%

Display: 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: W, KW, MW, GW ａnd TW. 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)

LED Indicators: 14 Color LED’s from 103 to 1014 ohms. Colors (RED, GREEN, YELLOW, or Blank/OFF).

Timer Memory: Times measurements In Seconds up to 99 seconds (Displayed on LCD)Register stores up to 80 data points (MEM # Displayed after RESET)

Response Electrification: Response from 0.1 to 1.0E06 Ohms: 2.0 secondsAverage Measurement Period from 0.1 ohms to 1.0E12 Ohms 2.5 Seconds. Calculated Electrification Period per ESD S11.11, 7.5 seconds 0.1 ohms to 10E+12 Ohms. Programmed Electrification 1.0E+12 to 2.0E14 Ohms: 15.0+ seconds

Power: Two 9-VDC alkaline batteries. Nominal battery life 25 hours.Dimensions: 4.0" wide x 6.0" long x 2.0" deep.Weight: 22 ounces, with batteriesOpen Circuit Current (I):4ma @ 100 VoltsFunction/ Mode: Toggles Through Six (6) Operation Modes:

Resistance Range Select: 2 Triangular button Arrows: UP ａnd DOWN . Select ResistanceRange in single decades in Manual ａnd Automatic/Manual modesTest Volts: Manual Selection of 10, 10 or 100 volts in Manual Mode

Record/Recall:Turns Memory Register ON if OFF. Calculates ａnd Displays Minimum,Maximum ａnd Average of data stored in Memory Register.

Clear: Erases data in Memory Register; if in HOLD mode, discards most recent Held Value

ON/OFF:Power-up, perform functional Battery tests. Power down if ON.

Batt. Test:Displays GOOD on LCD if acceptable voltage or Lo if unacceptable

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

Test: Begins measurement sequence.

Battery Buss Cut OFF:ON/OFF Switch isolates batteries from instrument circuits for storage transport

Automatic Function ａnd Exceptional Accuracy:The PRS-812’s Automatic mode is designed to simplify ESD Auditors’ measurement ａnd data recording challenges, while enhancing measurement reproducibility ａnd accuracy. During power-up, the instrument automatically checks its measurement functions, multiple displays ａnd performs a Battery Test. Once “GOOD” is displayed, the operator simply presses the TEST button to obtain an accurate measurement. 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.

Data Log Calculation: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.