DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Website:
Desco.com
TB-3062
Page 3 of 8
© 2013 DESCO INDUSTRIES, INC.
Employee Owned
A. Test Jacks:
The shielded test leads connect here. The
black test lead’s 3.5mm plug connects into the stereo jack,
and the white test lead’s banana plug connects into the
banana jack.
B. Display:
Temperature, Relative Humidity and Surface
Resistance Mantissa values appear on this display.
When the test button is depressed and the meter is set to
FULL test mode, the following information will display in
sequence:
• Temperature in degrees Fahrenheit (±10%)
• Temperature in degrees Celsius (±10%)
• Relative Humidity as a percentage (±10 integers)
• Surface Resistance Mantissa (with exponent displayed
via LED, measurement in ohms)
Surface resistance ohm values are expressed with a
mantissa and exponent (power) of the number. For example,
if the #8 exponent LED illuminates and the meter displays
“7.14”, the measurement is 7.14 x 10
8
ohms or 714,000,000
ohms.
If the measured surface resistance is over 10
12
ohms, “1___”
will appear on the display.
C. Exponent LEDs:
These LEDs indicate the surface
resistance exponent value. They are color coded for quick
checks.
Exponent Color
<3, 3
Red
4, 5
Green
6, 7, 8
Blue
9, 10
Green
11, 12, >12 Yellow
Quick Checks
The surface resistance exponent number illuminates
immediately (i.e. 8 = 10
8
ohms or 100,000,000 ohms).
D. Function LEDs:
These LEDs indicate the measurement
type indicated on the display. The surface resistance
mantissa is displayed when either the “10V” or “100V” LED is
illuminated.
These LEDs will flash when the battery voltage drops to
approximately 2 volts. Replace the batteries when this
occurs.
E. Test Voltage Button:
When set to AUTO, the meter will
automatically switch to the appropriate test voltage for the
measured resistance range. The Function LEDs will indicate
the applied test voltage. Material that is 9 x 10
5
ohms or
less should be measured at 10 volts. Material that is 1 x 10
6
ohms or greater should be tested at 100 volts. When the
switch is set to 10V HOLD, the test voltage will be fixed at 10
volts regardless of the measured resistance value.
F. Quick Check Button:
When set to FULL, the meter
will cycle through the 15 second period that displays the
temperature and relative humidity before the surface
resistance mantissa is displayed. When set to QUICK, the
meter will skip the 15 second period and immediately display
the measured surface resistance mantissa.
G. Test Button:
Push and hold this button to make a
measurement with the meter. Testing in accordance with
ANSI/ESD S4.1 requires 15 seconds of electrification. These
15 seconds are included when the meter is set to FULL test
mode. The surface resistance mantissa will display on the
meter after temperature and relative humidity measurements
are displayed.
The surface resistance exponent number illuminates
immediately, and the meter first displays the temperature
and relative humidity during a 15 second electrification
period. The mantissa is then displayed at the end of the test
sequence. For example, if the #8 exponent LED illuminates
and the meter displays “7.14”, the measurement is 7.14 x 10
8
ohms or 714,000,000 ohms.
H. Battery Compartment:
Open this compartment to install
the two AA alkaline batteries needed to power the meter.
Replace the batteries once the Function LEDs begin flash.
Operation
General Guidelines
• Use both 5 pound electrodes for Rtt measurements.
• Use one 5 pound electrode and connect the black test
lead to ground for Rtg measurements.
• Ensure that the item being measured is electrically
isolated (placed on an insulative surface). The meter will
measure the lowest resistance path.
• Ensure that the test leads are separated and uncrossed
as a best practice.
• When using 5 pound electrodes:
• Place them no closer than 2" from the edge of the
surface being measured
• Place them no closer than 3" to any groundable
point
• Place them about 10" apart from each other for Rtt
measurements of a worksurface
• Place them about 3' apart from each other for Rtt
measurement of a floor
• Preferable electrode placements include:
• Most commonly used area of a surface
• Most worn area
• Center of surface
• Furthest area from a grounded point
• If the surface to be measured has sections (i.e. floor
tiles, garment panels), place the 5 pound electrodes on
different sections for Rtt measurements.
• Clean the material’s surface for Test Lab measurements,
but do not clean the surface for materials that are
already installed. Only clean and re-test the installed
material if failure occurs.
