Calibration
Frequency of recalibration should be based on the
critical nature of those ESD sensitive items handled
and the risk of failure for the ESD protective
equipment and materials. In general, SCS
recommends that calibration be performed annually.
In-house calibration can be performed by using
±
1%
tolerance resistors in each of the meter's decade
ranges. Connect the resistors to the test leads using
clips and record the meter
’
s display. Minimize
crossing the test leads when possible. Contact SCS
Customer Service should adjustments be necessary.
Special equipment is required to adjust the meter.
Required Equipment
l
Digital Multimeter (
±
1.25% accuracy @10VDC
and 100VDC)
l
Resistance Decade Box with a range of 10
3
to
10
12
ohms (
±
2% accuracy @ 10
3
to 10
10
ohms;
±
5% accuracy @ 10
11
to 10
12
ohms)
l
Thermometer (
±
1
°
F accuracy)
l
Relative Humidity Meter (
±
2% accuracy)
l
99% Isopropyl Alcohol and Cleaning Wipes
Setup
l
Test Area
-needs to be free of any high voltage
transformers or power supplies and away from
any type of fluorescent lighting or high power
lighting.
l
Worksurface
-needs to be covered with a
grounded conductive mat at 1.0 x 10
3
or less.
l
Technician
-needs to be connected to equipment
l
ground with a 0 ohm resistor in the ground cord.
l
Decade Box
-needs to be connected to equipment
ground.
Normalization of the Meter
The temperature inside the testing area needs to be
75
°
F
±
3
°
F (23.9
°
C
±
1.7
°
C) at 40% to 60% relative
humidity. The meter needs to stay at a temperature
of 75
°
F
±
3
°
F (23.9
°
C
±
1.7
°
C) for approximately 1
hour for proper readings. The meter cannot be
normalized inside objects, enclosed boxes,
containers or cases. The temperature inside an
enclosed case will differ from the outside
temperature.
SCS
- 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634
•
Website:
StaticControl.com
TB-9092
Page 7 of 8 December 2019
©
2019 DESCO INDUSTRIES INC
Employee Owned
These cases will act as insulators. The meter must
remain stationary in the testing area for about 1
hour without any significant changes to the
temperature.
NOTE: Accuracy is measured after normalizing the
meter for a minimum of 1 hour.
Calibration Verification Procedure
1. Use only the test leads that were supplied with
the meter.
2. Use 99% isopropyl alcohol to clean the two test
jacks located at the top of the meter. Oil from
human fingers can affect the accuracy of the
meter.
3. Connect the test leads to the test jacks located
at the top of the meter. Connect the opposite end
of the test leads to a DC voltmeter.
4. Press the red pushbutton. The measured voltage
should start at 10V
±
5% and increase to 100V
±
5% at the end of the test cycle.
5. Connect the test leads to the Resistance Decade
Box. Apply the load resistance values indicated
in the table below. The meter should display
accuracy within
±
10% of the loaded resistance
value.
Load
Resistance
Accuracy
Display
Value
Exponent
LED
1 x 10
12
+20%
1.20x10
12
12
-20%
8.00x10
11
11
1 x 10
11
+10%
1.10x10
11
11
-10%
9.00x10
10
10
1 x 10
10
+10%
1.10x10
10
10
-10%
9.00x10
09
9
1 x 10
09
+10%
1.10x10
09
9
-10%
9.00x10
08
8
1 x 10
08
+10%
1.10x10
08
8
-10%
9.00x10
07
7
1 x 10
07
+10%
1.10x10
07
7
-10%
9.00x10
06
6
1 x 10
06
+10%
1.10x10
06
6
-10%
9.00x10
05
5
1 x 10
05
+10%
1.10x10
05
5
-10%
9.00x10
04
4
1 x 10
04
+10%
1.10x10
04
4
-10%
9.00x10
03
3
1 x 10
03
+10%
1.10x10
03
3
-10%
<1.0x10
03
<3
