19635 Desco, 19635 Datasheet - Page 2

• Manufacturer Part Number: 19635
• Description: TESTER MINIMEG 9VDC NIST
• Manufacturer: Desco
• Type: Testerr

Specifications of 19635

• Features: Pocket Size
• Power Supply Type: 9V Battery
• Battery Type: 9
• Includes: Cable for resistance-to-ground measurements
• Resistance Range: 10^10 Ohms
• Standards: ANSI⁄ESD S20.20
• Tester Type: Pocket Megohmmeter
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: Surface Resistance
• Lead Free Status / Rohs Status: RoHS Compliant part

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Each LED indicates one order of magnitude of
resistance. If the test surface is conductive to less than
10E5, 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
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 megohmmeter. 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 resistance will
be indicated by the number of LEDs which light up.
The more lights illuminated, the greater the conductivity
of the surface. The measurement is in ohms/square.
Figure 3. Measuring surface resistivity.
Surface-to-Ground Measurements (RTG)
The Surface-to-Ground feature is best used when
expected results are less than 10E6 ohms, and
when residual voltages can be removed from the test
surface. Residual voltages may cause the two upper
range LEDs to light, resulting in a false reading.
When the Surface-to-Ground cord is plugged in,
voltage is diverted from the center electrode to the
cord in order to measure resistance. When making
Surface-to-Ground tests, follow these procedures:
A. Check battery operation by depressing the white
button. The red “On” lamp will indicate that the unit is
functioning properly.
B. Plug the Surface-to-Ground cord into the left side of
the megohmmeter.
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Figure 5. Measuring Surface-to-Ground resistance.
F. Unplug the cord when testing is finished.
Battery Operation
Battery function is automatically checked by the unit
when the meter is turned on. If the battery voltage
drops below 8 VDC, the red LED on the far right of the
meter will not light, indicating a “low battery” condition.
Replace battery with a new 9V alkaline battery.
Maintenance
Your Micro Meg will require very little maintenance,
and there are few user-serviceable parts. If your
meter requires service beyond the simple procedures
described below please contact the factory.
Electrode Cleaning
To assure accurate measurements the electrodes
should be kept as clean as possible. A thorough
cleaning at least every 3 months is recommended. The
following is the recommended cleaning procedure:
1. Carefully remove the electrodes from their
snap-jacks using a screw driver or other blunt flat
bladed object. Avoid scratching or bending electrodes.
Figure 4. Installing Surface-to-Ground cord assembly.
C. Place the Micro Meg on the test surface.
D. Connect the test cord to the ground-point for the
surface.
E. Press the white button. The LEDs will indicate the
test results. The measurement is in ohms.
GROUND
POINT
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