TB-6520
Page 6 of 7
© 2010 DESCO INDUSTRIES INC.
Employee Owned
Calibration
The Surface Resistance Test Kit is calibrated to NIST
traceable standards. Most users require calibration
annually. Please call our Customer Service Department at
909-664-9980 (Chino, CA) or 781-821-8370 (Canton, MA)
for details. In-house calibration can be performed by using
1% resistors in each of the meter ranges. Simply attach the
resistors to the cords using grounding clips and recording
the meter display. Keep the cords separated. Should
adjustment be necessary, it is recommended that the unit
be returned to the factory as access to internal adjustments
requires special equipment and test cables.
CALIBRATION EQUIPMENT:
• Digital Multimeter - accurate to 1.25% @ 10VDC and
100VDC
• Fixed Decade Box value 10E3 - 10E12 - accurate to
±2.5%, except at 10E11 and 10E12 (±5%)
• Thermometer - accurate to ±1°F
• Humidity meter - accurate to 2%
• Test leads
• 99% Isopropyl alcohol and cleaning wipes
SET UP:
A. Test Area
- Area needs to be free of any high voltage
transformer or power supply. Not to be performed under
any type of fluorescent lighting or high power lighting.
B. Worksurface
- needs to be covered with conductive mat
at 1.0 x 10E3 or less, connected to equipment ground.
C. Technician
- needs to be grounded with zero ohm
resistor to equipment ground.
D. Decade Box
- needs to be grounded to equipment
ground.
Accuracy is measured after normalizing the instrument at
70-80 °F and 30-50% RH for a minimum of 4 hours.
NORMALIZATION OF SURFACE RESISTANCE TEST KIT
Temperature inside testing area needs to be 75°F @
±6.6% 40% to 60% RH. Testers need to stay at constant
temperature 75°F @ ±6.6% for about 2 hours for proper
reading. Meter cannot be inside objects, enclosed boxes,
containers or cases unit is supplied with (temperature inside
case will differ from outside temperature, cases will act like
an insulator to the Meter),
Meter will have to be stationary
in testing area for about 2 hours with no significant
temperature changes.
CALIBRATION TEST PROCEDURE
• When testing use only the leads supplied with the meter.
DO NOT TEST WITH RESISITIVITY ATTACHMENT,
Resistivity Attachment will give a much higher reading
and is only designed for spot checking.
• With 10V/AUTO switch down, press TEST button -
voltage between the two leads should be 10V ±5%
• With 10V/AUTO switch up, press TEST button - voltage
between the two leads should be 100V ±5%
• Using the cleaning wipes and 99% isopropyl, clean
around banana jack and mono jack where leads connects
to, oil from human fingers can alter accuracy.
• Make sure 10V/AUTO switch is set to AUTO (switch up).
Testing each decade starting from 1.0 x 10E12 and down,
do not start from 1.0 x 10E3.
Temperature
Fahrenheit
= 75°F ±6.6%
Celsius = 23.8°C ±10.2%
Relativity Humidity ±10 Digits
A. 1.0 x 10E12
+ 20% LED = 12 Yellow Mantissa 1.20
0%
LED = 12 Yellow Mantissa 1.00
- 20% LED = 11 Yellow Mantissa 8.00
B. 1.0 x 10E11
+20% LED = 11 Yellow Mantissa 1.20
0%
LED = 11 Yellow Mantissa 1.00
-20% LED = 10 Green Mantissa 8.00
C. 1.0 x 10E10
+10% LED = 10 Green Mantissa 1.10
0%
LED = 10 Green Mantissa 1.00
-10% LED = 9 Green Mantissa 9.00
D. 1.0 x 10E9
+10% LED = 9 Green Mantissa 1.10
0%
LED = 9 Green Mantissa 1.00
-10% LED = 8 Blue Mantissa 9.00
E. 1.0 x 10E8
+10% LED = 8 Blue Mantissa 1.10
0%
LED = 8 Blue Mantissa 1.00
-10% LED = 7 Blue Mantissa 9.00
F. 1.0 x 10E7
+10% LED = 7 Blue Mantissa 1.10
0%
LED = 7 Blue Mantissa 1.00
-10% LED = 6 Blue Mantissa 9.00
G. 1.0 x 10E6
+10% LED = 6 Blue Mantissa 1.10
0%
LED = 6 Blue Mantissa 1.00
-10% LED = 5 Green Mantissa 9.00
H. 1.0 x 10E5
+10% LED = 5 Green Mantissa 1.10
0%
LED = 5 Green Mantissa 1.00
-10% LED = 4 Green Mantissa 9.00
I. 1.0 x 10E4
+10% LED = 4 Green Mantissa 1.10
0%
LED = 4 Green Mantissa 1.00
-10% LED = 3 Red Mantissa 9.00
J. 1.0 x 10E3
+10% LED = 3 Red Mantissa 1.10
0%
LED = 3 Red Mantissa 1.00
-10% LED = <3 Red Mantissa <0.90
EMIT
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Fax (909) 627-7449 • Website:
