Desco Limit Comparator User manual

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com
TB-3035 Page 1 of 3 Revision May 2009
© 2009 DESCO INDUSTRIES INC.
Employee Owned
Limit Comparator - Instructions for Use
Made in America
Item 19259 Limit Comparator for Testers
DESCRIPTION
PACKAGING
1 Limit Comparator
2 Test Leads, Banana to Banana
1 NIST Certicate of Calibration
OPERATION
Testing Footwear Circuit, refer to gure 3.
To complete the footwear test, you will need to test the
low and high limits. Refer to the dipswitch setting on the
left side of the testers for footwear test ranges.
Manufacturer’s suggested default test range is 750K
low and 35Meg high for the US and Europe.
Do not power down tester, remove stereo cable from
bottom right jack of tester labeled “FOOTPLATE” and
connect the stereo lead from model 19259 to the jack
labeled “FOOTPLATE”.
Testing Low Circuit – If the tester’s low range is set to
750K. Set the knob on model 19259 to the “750K LOW”
position. Touch the TEST contact on the tester and you
should get a red LED for the left
and right foot.
Disregard the test result for the wrist strap, if the wrist
strap circuit is on.
Set the knob on model 19259 to “750K Pass”, touch the
TEST contact on the tester and you should get a green
LED for the left and right of the foot.
TB-3045 February 2010 Page 1 of 3 © 2010 DESCO INDUSTRIES INC.
Employee Owned
TECHNICAL BULLETIN TB-3045
Banana Jacks - For
Testing Wrist Strap
Circuit
Test Limit Knob -
Adjustment for Test
Stereo Jack - For
Testing Footwear
Circuit
Banana to banana Test Lead - For
Testing Single Wire Wrist Strap Circuit
Figure 2. Limit Comparator features and components
Figure 3. Footwear Test Setup
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

TB-3035 Page 2 of 3 Revision May 2009
© 2009 DESCO INDUSTRIES INC.
Employee Owned
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone] • Fax [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Fax [phone] • Website: Desco.com
Testing High Circuit – If the tester’s high range is
35Meg. Set the knob on model 19259 to “35M PASS”,
touch the TEST contact on the tester and you should
get a green LED for the left and right feet. Set the
knob on model 19259 to “35M HIGH”, touch the TEST
contact on the tester and you should get a yellow LED
for both the left and right feet. If the limit is set to 1Gig
on the tester, test at 1Gig on model 19259, same for
10Meg and 100Meg. Disregard the test result for the
wrist strap, if the wrist strap circuit is on.
Testing Wrist Strap Circuit, refer to gure 2
To complete the wrist strap test, you will need to test
the low and high limits. Refer to the dipswitch setting
on the left side of the testers for wrist strap test ranges.
Manufacturer’s suggested default test range is 750K
low and 10Meg high for the US and 750K to 35Meg for
Europe.
Do not power down the tester. Using the 2 banana
leads included with model 19259. Attach 1 of the
banana leads to the right side banana jack on model
19259 and connect the other end to the ground
symbol jack on the tester. Connect the last banana jack
to the left banana jack of model 19259 and the other
end to the “SINGLE – WIRE” banana jack. Note be sure
FOOTPLATE lead is removed.
Testing Low Circuit - If the tester’s low range is set to
750K. Set the knob on model 19259 to the “750K LOW”
position. Touch the TEST contact down on the tester
and you should get a red LED for the Wrist strap.
Disregard the test result for the footwear. Set the knob
on model 19259 to “750K Pass”, touch the TEST
contact on the tester and you should get a green LED
for the wrist strap.
Testing High Circuit – If the tester’s high range is
10Meg. Set the knob on model 19259 to “10M PASS,”
touch the TEST contact on the tester and you should
get a green LED for the wrist strap. Set the knob on
model 19259 to “10M HIGH”, touch the TEST contact
on the tester and you should get a yellow LED for the
wrist strap. If the limit is set to 35Meg on the tester, test
at 35Meg on model 19259. Disregard the test result for
the footwear.
SPECIFICATIONS AND DIMENSIONS
Charge Detection
When the operator is connected to the remote and
accumulates a voltage greater than ± 1.25 volts, the
CHARGE LED (red) will display in its respective OP-
ERATOR section (for charge detection data out, see
the Data Output section on Page 8). To disable charge
detection on the display, shunt jumper JP6 inside the
unit (See Page 7). If a charge is detected while using
this conguration, the display will remain in its previous
state until the charge is no longer detected.
Testers limit comparator will calibrate:
19276 - Combo X3 Tester, Data Output, w/ Dual Plate
19277 - Combo X3 Tester, Data Output, Programmable,
w/ Stand
CALIBRATION
There are no user adjustments on model 19259. Each
value is a xed resistor load, any model 19259 that falls
out of specication will need to be sent to factory for
repair. Using a DVM (digital voltmeter), set the meter
to read ohms. The limit that the knob is set on can be
measured using the DVM connected between Banana
1 to Banana 2 and connected between Conductor 1
and Conductor 2. Refer to gure 3.
TB-3045 Page 2 of 3 © 2010 DESCO INDUSTRIES INC.
Employee Owned
Footwear Low Fail Footwear Low and
High Pass
Footwear High Fail
Wrist Strap Low Fail Wrist Strap Low and
High Pass
Wrist Strap High Fail
Figure 3a. Footwear status LEDs Figure 4a. Wrist Strap status LEDs
Figure 4. Wrist Strap Test Setup
Weight: 0.197 Ib
Dimensions: 3.76 x 2.41 x 1.52 in
9.55 x 6.12 x 4.52 cm
3.76”
9.55cm
1.52”
3.86cm
0.93”
2.36cm 2.41”
6.12cm
Figure 5. Limit Comparator specications and
dimensions

Revision May 2009
© 2009 DESCO INDUSTRIES INC.
Employee Owned
19259 LIMIT NOMINAL
RESISTANCE % TOLERANCE OF NOMINAL
RESISTANCE
100K FAIL LOW 89K ±2%
100K PASS 110K ±2%
750K FAIL LOW 675K ±2%
750K PASS 825K ±2%
1M FAIL LOW 909K ±2%
1M PASS 1.10M ±2%
10M PASS 9.09M ±2%
10M FAIL HIGH 11.09M ±2%
35M PASS 31.09M ±2%
35M FAIL HIGH 37.89M ±2%
100M PASS 90.9M ±2%
100M FAIL HIGH 112.9M ±2%
1G PASS 812.9M ±2%
1G FAIL HIGH 1.213G ±2%
Limited Warranty
Desco expressly warrants that for a period of one (1)
year from the date of purchase, Desco Limit
Comparator will be free of defects in material (parts)
and workmanship (labor). Within the warranty period,
a garment will be replaced at Desco’s option, free of
charge. Call Customer Service at 909-627-8178
(Chino, CA) or [phone] (Canton, MA) for
Return Material Authorization (RMA) and proper
shipping instructions and address. Include a copy of
your original packing slip, invoice, or other proof of
date of purchase. Any garment under warranty should
be shipped prepaid to the Desco factory. Warranty
replacements will take approximately two weeks.
Warranty Exclusions
THE FOREGOING EXPRESS WARRANTY IS
MADE IN LIEU OF ALL OTHER PRODUCT
WARRANTIES EXPRESSED AND IMPLIED,
INCLUDING MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE WHICH ARE
SPECIFICALLY DISCLAIMED. The express warranty
will not apply to defects or damage due to accidents,
neglect, misuse, alterations, operator error, or failure
to properly maintain, clean or repair products.
Limit of Liability
In no event will Desco or any seller be responsible or
liable for any injury, loss or damage, direct or
consequential, arising out of the use of or the
inability to use the product. Before using, users
shall determine the suitability of the product for their
intended use, and users assume all risk and liability
whatsoever in connection therewith.
TB-3045 Page 3 of 3 © 2010 DESCO INDUSTRIES INC.
Employee Owned
Banana Jack 1
Conductor 1
Conductor 2
Banana Jack 2
Figure 6. Test Points
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com