PPE-5034.E
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© 2018 DESCO INDUSTRIES INC
Employee Owned
DESCO EUROPE -
2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: +44 (0) 1462 672005 • E-mail:
, Website:
DescoEurope.com
Made in the
United States of America
Calibration Unit for Testers
Installation, Operation and Maintenance
Description
The Charleswater
99090
Calibration Unit is designed to
verify whether a tester is operating within specifications.
The Calibration Unit is a passive device and requires
no power source. The Calibration Unit is manufactured
with industry accepted test ranges for both wrist straps
and foot grounders. Both the wrist strap and footwear
pass range is set to 750K to 35M. The Charleswater
Calibration Unit is calibrated to NIST traceable
standards.
The Charleswater
99090
Calibration Unit is to be used
with the following items:
Item
Description
225221
Portable Wrist Strap Tester
99037
Combo Tester
99038
Combo Tester with Stand and Foot Plate
Packaging
1 Calibration Unit
2 Test Leads with Banana Plug Terminals
1 Certificate of Calibration
July 2018
Figure 1. Charleswater
99090
Calibration Unit
Operation
WRIST STRAP TESTER
1. Plug one of the included test leads into the black
banana jack labelled “E” on the Calibration Unit.
Connect the opposite end of the test lead into the
yellow banana jack located on the
225221
Portable
Wrist Strap Tester.
TECHNICAL BULLETIN PPE-5034.E
2. Connect the second test lead to the red 675K
banana jack labelled “A” on the Calibration Unit.
Touch the opposite end of the test lead to test
plate on the Wrist Strap Tester and press down to
activate the test. Be sure not to touch the banana
plug or test plate with your skin.
3. Observe the response from the Portable Wrist Strap
Tester. The alarm should sound, and the LOW LED
should illuminate red.
4. Repeat the procedure for test points B (825K), C
(35M) and D (40M). The expected test results can
be found in the following table:
Test
Point
Resistance
Value
Tester
LED
Buzzer
A
675K
FAIL LOW
ON
B
825K
PASS
OFF
C
35M
PASS
OFF
D
40M
FAIL HIGH
ON
Figure 2. Connecting the test lead from banana jack
“E” on the Calibration Unit to the banana jack on the
Portable Wrist Strap Tester
