19253 Desco, 19253 Datasheet - Page 4

• Manufacturer Part Number: 19253
• Description: TESTER COMBO WS&FS W/ PLATE
• Manufacturer: Desco
• Type: Testerr

Specifications of 19253

• Features: Base Plate
• Power Supply Type: Battery (Optional AC Adapter)
• For Use With/related Products: Wrist Straps, Foot Plate
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 16-1098; 19253

TB-2040 Page 4 of 6
Figure 11. Testing of wrist strap grounding assemblies
IV. Lighting of the green “PASS” LED indicates that the wrist
V.
TESTING FOOT GROUNDING DEVICES
When using a Footwear Tester that does not use a split footplate,
one needs to test one foot at a time; best practice is to raise the
other foot off the floor. When testing conductive shoes, or foot
grounders worn on both feet, test each foot separately to test the
separate path-to-ground. If the floor is an ESD floor, placing the
other foot on the floor may result in erroneous test results. Care
should also be taken not to create (hand resting on wall or bench)
other paths-to-ground.
I.
II.
III. Press the test button so that the unit activates. Hold down for
Figure 12. Testing foot grounding devices
IV. Lighting of the green “PASS” LED indicates that the foot
V.
VI. Repeat steps I - III with other foot.
strap and ground cord assemblies are functioning properly.
If either red “FAIL LO” or “FAIL HI” LEDs light and the audible
indicator sounds, the wrist strap wearer should check the
wrist strap assembly immediately.
Press rocker switch toward “FOOTPLATE”.
Place one foot on the plate. If the floor is conductive, lift the
foot you are not testing off of the floor during this test. Make
sure there is no cord plugged into the “WRIST CORD” jack.
2-3 seconds.
ground assemblies are functioning properly.
If either red “FAIL LO” or red “FAIL HI” LEDs light and the
audible indicator sounds, the wearer should check the foot
grounding device immediately.
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website:
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
Calibration
The models 19250, 19253, and
traceable standards. We recommend that calibration is performed
annually to ensure that the Tester is operating within limits. Due to
its dual circuit design both test circuits of the Combo Tester must
be calibrated individually.
Desco offers a calibration unit that is specifically designed to
simplify the calibration procedure. This unit is sold as item
07010. The Calibration Unit comes calibrated to NIST traceable
standards. For additional information on the 07010, ask for
Technical Bulletin TB-2039.
750 Kilohm - 10 Megohm TEST RANGE - WRIST STRAPS
The following resistance should give the display shown:
Resistance Value (± 1%)
750 Kilohm - 100 Megohm TEST RANGE - FOOTWEAR
The following resistance should give the display shown:
Resistance Value (± 1%)
To calibrate, simply test each resistance value shown above which
are included in the
button and “WRIST CORD” jack for calibration of the 750 Kilohm -
10 Megohm range. Test across the test button and “FOOTPLATE”
jack for calibration of the 750K - 100M range. Be sure rocker
switch is set correctly.
Figure 13. Calibration of the Combo Tester’s 750 kilohm to
100 megohm range
Figure 14. Calibration of the Combo Tester’s 750 kilohm to
10 megohm range
120 Megohm
675 Kilohm
825 Kilohm
80 Megohm
11.5 Megohm
8.5 Megohm
675 Kilohm
825 Kilohm
07010
Calibration Unit. Test across the test
19252
Green (Pass)
Green (Pass)
Red (Fail Lo)
Green (Pass)
Green (Pass)
Red (Fail Hi)
are calibrated to NIST
Test Output
Red (Fail Hi)
Desco.com
Red (Fail Lo)
Test Output
© 2009 DESCO INDUSTRIES INC.
Employee Owned