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PRS-812 Resistance Meter
B. Good Measurement Practices
Several factors will effect precision resistance measurements. Most practitioners are aware
of the importance of using care when handling instruments, proper use of connections, lead
resistance, grounding, and the impact of electrical or electrostatic fields on their equipment.
As with most very precise instruments, the PRS-812 circuits and its cables are sensitive to
the effects of electromagnetic and electrostatic fields. These effects, are minimized by
instrument and test lead design and material selection. However, good measurement
practices should be exercised at all times to ensure accuracy and repeatability. Follow the
recommendations below to obtain optimal performance from the PRS-812.
1. Instrument handling and preparation
a. Do not drop or cause mechanical shock to your instrument
b. Store the instrument in a clean, dry environment. Do not expose the instrument to
wet, extremely hot or cold conditions.
c. If the unit is stored in a cold environment, allow it to stabilize at room temperature
before powering up the unit.
d. Be sure fresh batteries are installed when beginning an extensive measurement
sequence. Periodically check the condition of your batteries by pressing BATT.
TEST. If
Lo
is indicated, replace your batteries.
e. When making resistance measurements at or below 10 ohms,
always
perform The
Low Range Calibration Procedure. Repeat the procedure to confirm the instrument’s
response.
f. During resistance measurements, stand back, away from the instrument to avoid
body capacitance or fields from effecting instrument accuracy.
g. To avoid body fields from interfering with instrument accuracy, wear a wrist strap
attached to a tested ESD ground to dissipate body charges.
2. Use only PROSTAT test leads, cables and accessories supplied with the PRS-812. Be
sure that leads are properly connected to their respective terminals as described below.
WARNING
To prevent possible electrical shock,
Do Not Touch
energized
circuits, leads or fixtures while grounded.
Use only pre-tested ground connections that meet local safety
standards and codes for earth grounding. Refer to National
Electrical Codes and ESD Association Standard S6.1
Grounding
for information and test procedures. Ground testing should be
conducted only by qualified personnel.
Operational Note:
Low voltage batteries will affect measurement accuracy!