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TEST VOLTAGES

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

ACCURACY

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%

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: ?, K?, M?, G? and T?. 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 >1012 ohms.
Colors (RED, GREEN, YELLOW/ORANGE, or Blank/OFF)

TIMER

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

MEMORY

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

ELECTRIFICATION:

Resistance Range

Electrification Period

0.1 to <1.0E06 Ohms
1.0E06 to <1.0E12
1.0E12 and greater

<3.0 seconds
8.0 seconds
15.0 seconds

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

POWER

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

DIMENSIONS

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

WEIGHT

22 ounces, with batteries

OPEN CIRCUIT CURRENT (I)

<4 ma @ 100 Volts

RESISTANCE RANGE SELECT

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

TEST VOLTS

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

RECORD/RECALL

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.

CLEAR

Erases all data in Memory Register; if in HOLD mode, discards the 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

USEFUL MODES OF OPERATIONS

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.

DATA LOG & CALUCULATION

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.

USAGE RECOMMENDATION

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