TECHNICAL BULLETIN
Unit 17. Millbrook Business Park, Sybron Way • Crowborough, East Sussex TN6 3JZ United Kingdom
Phone: 00 44 (0) 1892-665313, Fax: 00 44 (0) 1892-668838 • E-mail: info@charleswater.co.uk, Internet: www.charleswater.co.uk
PPE-5046.E
6/01 Page 1 of 3
:
Meg™ Pocket Megohmmeter
Operation and Maintenance
Figure 1. 99035
:
Meg Pocket
Megohmmeter
Description
The Charleswater Europe
:
Meg Pocket
Megohmmeter is a portable test
instrument designed for measuring both
surface resistivity and surface-to-ground
resistance of static dissipative and
conductive materials. Seven colour-
coded LEDs, reading from right to left,
easily identify static dissipative and
conductive ranges. The
:
Meg will test
materials with surface resistivity of 10
5
-
10
10
Ohms/sq. This test instrument is
ideally suited for Quality Control and
Field Service personnel as well as for
use in your regular auditing of your ESD
protective materials. The
:
Meg features
simple one-button operation and a 9V
battery for constant use and maximum
portability. This state-of-the-art, auto-
ranging instrument provides top
performance, yet weighs only 170
grams. The high-impact plastic case
ensures durability despite the meter’s
light weight.
The
:
Meg has not been designed to
meet BS IEC 61340-5 test equipment
requirements and therefore
measurements obtained with this device
may not agree with measurements
taken according to the BS IEC 61340-5
test procedure. This test instrument is
intended for use only as an auxiliary
tool for monitoring surface resistivity. If
you are interested in obtaining a meter
which does meet all the test equipment
requirements of BS IEC 61340-5, we
recommend our model 99100 Surface
Resistance Test Kit. For more
information on this product ask for
techical bulletin PPE-5033.E.
Installation
Remove the meter from the carton and
inspect for damage. Each unit should
be fully charged and includes:
1
:
Meg Pocket Megohm meter
1 Surface-to-Ground, cord assembly
1 PPE-5046.E technical bulletin
1 Installed 9V battery
Properly store the meter and its
component assemblies when not in
use.
Operation
The
:
Meg will perform Surface
resistivity and Surface-to-Ground
resistance measurements. Work
surfaces and materials to be tested
should be cleaned prior to testing to
ensure that surface dirt and
contamination do not affect results. It is
recommended that non-silicone based
cleaners such as Charleswater
Europe’s ‘REZTORE’ Surface and Mat
Cleaner be used for regular cleaning of
ESD protective work surfaces. When
non-ESD surfaces are being used,
‘Reztore’ Topical Antistat is
recommended for eliminating static
charge generation.
Figure 2. Cleaning the work surface
before testing.
Surface resistivity and Surface-to-
Ground resistance readings are
indicated by the series of LEDs on the
face of the meter. The LEDs are read
from right to left as follows:
1.
Red
>10
10
Ohms, Meter is on
and battery is functioning
2.
Red
Less than 1x10
10
Ohms
3.
Green
Less than 1 x 10
9
Ohms
4.
Green
Less than 1 x 10
8
Ohms
5.
Green
Less than 1 x 10
7
Ohms
6.
Yellow
Less than 1 x 10
6
Ohms
7.
Yellow
Less than 1 x 10
5
Ohms
Each LED indicates one order of
magnitude of resistance. If the test
surface is conductive to less than 10
5
Ohms, all the LEDs will be lit. If it is
neither conductive nor static dissipative,
only the red “On” LED will be lit.
Surface Resistivity
Measurements (Rp)
Surface resistivity measurements are
made using only the meter without the
cord assembly. When the white button
is depressed a test voltage of 9 VDC is
applied to the meter’s center electrode.
The second resistivity electrode will
supply the resistance bridge and
provide the measurement. To perform
surface resistivity tests, follow these
simple instructions:
A. Check battery operation by
depressing the white button on the
center of the meter. The red “On” lamp
at the far right should light to indicate
that the unit is functioning properly.
B. Place the meter on the surface being
tested. All three electrodes should make
contact with the surface.
C. Press the white button. The surface
resistivity will be indicated by the
number of LEDs which light up. The
more lights illuminated, the greater the
conductivity of the surface.
Figure 3. Measuring surface resistivity.
WORK SURFACE
