14
PRS-812 Resistance Meter
d. Press RESET to calibrate instrument to shunt reference
e. Press TEST to measure shunt resistance of 1.02
0.02 ohms (
)
f. Press RESET button to prepare instrument for the next measurement
g. Repeat calibration procedure if necessary
h. Remove Calibration Shunt
5. Connect test leads to positive (+) [Power] and negative (-) [Sensing] terminals
Standard 10-foot test leads are used for general audit measurements.
6. Connect test leads to electrodes, fixture or circuit to be measured
7. Press Green TEST button to initiate Automatic measurement Test Cycle
a. The resistance range is reset to minimum. It is automatically adjusted in conjunction
with the resistance characteristics of the materials under test, based on:
(1) Test voltage; and,
(2) Current flow.
b. Test Voltage is reset to <10V and automatically increased in accordance with the
following material resistance characteristics:
(1)
<10 Volts
: 0.1 to less than 1.0x10
4
ohms (0.1
- <10K
)
(2)
10 Volts:
1.0x10
4
to less than1.0x10
6
ohms (10K
- < 1M
)
(3)
100Volts:
1.0x10
6
to 2.0x10
14
ohms (1M
- 200T
)
c. Electrification period, i.e., the time period during which test voltage is applied to the
material under test, is automatically adjusted to the PRS-812’s measurement
characteristics and industry standards (ESD S11.11) as follows:
(1)
2 to 3 Seconds
: 0.1 to less than 1.0x10
4
ohms (0.1
- <10K
)
(2)
2 to 4 Seconds:
1.0x10
4
to less than1.0x10
6
ohms (10K
- < 1M
)
(3)
7 to 8 Seconds:
1.0x10
6
to >1.0x10
12
ohms (1M
->1T
)
(4)
15+ Seconds:
1.0x10
12
to 2.0x10
14
ohms (1T
- 200T
)
8. When the PRS-812 displays and holds the final resistance measurement,
HOLD
is
indicated in the lower, right corner of the LCD.
NOTE:
The PRS-812 provides very accurate measurements up to 1.0x10
12
ohms, and has the
capability to display values up to 2.0x10
14
ohms. However, the user should be aware that
accuracy degrades rapidly above 1.0x10
12
ohms.