Concentric Ring
Resistivity End
One Probe Measures
Both Resistivity
and Resistance
Resistance
End
th
4916 26 Street West, Suite 100, Bradenton, Florida 34207
877- (463-1376), 941-751-7581 1-941-751-7586
Toll Free GND-ZERO Direct Phone Fax
Email
Http://www.gndzero.com
Ground Zero Electrostatics
MTR-1000 Megaohmmeter
Figure 2 - Features of the ZeroStat MTR-1000
A
B
C
D
E
H
G
F
A. Test Button - The
round black button will
turn on the power. When
depressed and held
down with reasonable
force the
resistivity/resistance,
humidity, and
temperature values are
displayed on the screen
for approximately 45
seconds. At the
completion of the test
the power will be turned
off automatically.
B. Selector Switch -
The switch selects the
desired applied test
voltage of either 10 or
100 volts.
36
At 10 volts the resistivity range is 1x10 - 9x10 ohms/sq. At 100 volts the
612
resistivity range is 1x10 - 1x10 ohms/sq.
If the battery is too low to give accurate readings the LCD will display "Low
Battery".
3
If the resistivity is below 10 ohms/sq., the LCD will display "Less than 1K".
12
If the reading is over 10 ohms/sq., the LCD will display "More than 2e12".
6
If the reading is over 10 ohms/sq. the LCD will display "Change to 100
6
volts" if the meter is set on 10 volts. If the reading is under 10 ohms/sq.,
the LCD will display "Change to 10 volts" if the meter is set on 100 volts.
C. External Test Jacks - The external probe test jacks on the top of the
meter are 3.5 mm monaural. For safety, banana plugs will not fit into
these jacks. When the plugs are inserted into the jacks the parallel test
probes on the bottom of the meter are deactivated.
D. AC Power Adapter - This plug allows the meter to be used with a
center positive 9 - 12 volt 200 mA power adapter. Using the incorrect
power adapter may cause serious damage to the instrument.
E. Ground Jack - Because of the possibility of 60 cycle electrical noise
the enclosed ground cord is recommended when the power adapter is
used. This jack is located on the top of the meter. Insert the plug into
the meter jack and attach the other end to the earth ground of the
building.
F. Battery Compartment - This compartment houses a supplied
9 volt battery which must be installed prior to use.
G. Parallel Test Probes- These probes are made from a highly
conductive, low durometer elastomer. Care should be taken to
avoid harsh solvents and extreme abrasion. Occasional cleaning
with a mild soap and water solution will extend the life of the
probe feet. If damage does occur, these probes are replaceable
for a nominal charge. These probes are used to test electrical
surface resistivity in ohms/square.
H. Case The meter case is injection molded from a high impact ABS
polymer. Simple cleaning with a mild soap and water solution will remove
any dirt or debris.
Prior to testing, ensure that surfaces to be tested are clean and free of
contaminants.
Parallel Probe Resistivity Method
The parallel resistivity probe method, complies with ASTM D-257. It is
used to give fast electrical resistivity measurements on flat homogeneous
materials. It may be used on multilayered materials, but this should be
noted along with the temperature and humidity values on the data report.
A. Place the meter on the desired surface to be tested.
B. Move switch to desired test voltage position, either 10 or 100
volts.
C. Press and hold down the test button. After the meter has had
time to measure the resistivity, humidity, and temperature these
values will be displayed on the LCD screen. This will happen
in approximately 15 seconds.
The resistivity reading will be in ohms/square, temperature in degrees,
and relative humidity in percent.
The meter will keep updating the display while the button is held down
and will continue to display the last test reading for approximately 45
seconds after the button is released.
Insert both coil cords using the
monaural plugs into the 3.5 mm
meter jacks. Attach the banana plug
coil cord terminations to the
concentric ring probe. Place the
probe on the surface to be tested.
Press the test button and wait 15
seconds. The correct temperature
and humidity will be displayed on
the LCD screen. The resistivity value
displayed MUST be multiplied by a
factor of ten to achieve the actual
test value. These values will read in
4
ohms/square, e.g., 3.5 x 10
ohms/square (displayed value).
Actual resistivity value will be 3.5 x
5
10 ohms/square.
OPERATION
SURFACE RESISTIVITY
Concentric Ring Probe Resistivity
Method
FEATURES
