TB-7573
Page 1 of 3
© 2013 Vermason
UNIT C, 4TH DIMENSION, FOURTH AVENUE, LETCHWORTH, HERTS, SG6 2TD UK
Phone: 0044 (0) 1462 672005, Fax: 0044 (0) 1462 670440 • E-mail:
Service@Vermason.co.uk
, Internet:
Vermason.co.uk
Limit Comparator
Operation Instructions
Description
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, Vermason recommends that calibration be
performed annually.
Use the Vermason
222696
Limit Comparator to perform
periodic testing (once every 6-12 months) of the Combo
Tester X3. The Limit Comparator can be used on the shop
floor within a few minutes virtually eliminating downtime,
verifying that the tester is operating within tolerances.
The Vermason
222696
Limit Comparator is to be used with
the following items:
October 2013
Figure 1. Vermason
222696
Limit Comparator
Item
Description
222550
Combo Tester X3
222551
Combo Tester X3 with Stand
222553
Combo Tester X3 with 10mm Adaptor
222554
Combo Tester X3 with Stand and 10mm
Adaptor
Packaging
1 Limit Comparator
2 Test Leads with Banana Plug Terminals
1 Certificate of Calibration
Tester Configuration
The resistance limits for footwear and wrist strap tests are
controlled by the DIP switches located on the left side of the
tester. Use the following tables for the DIP switch settings
and their corresponding test values.
Made in the
United States of America
TECHNICAL BULLETIN TB-7573
Left Side View
Figure 2. Locating the DIP switch on the Combo Tester
X3
FOOTWEAR RESISTANCE
DIP switches 1 and 2 control the HIGH test limit.
Switch 1 Switch 2 HIGH Limit Resistance
ON
ON
10 Megohms (1 x 10
7
)
OFF
OFF
35 Megohms (3.5 x 10
7
)
ON
OFF
100 Megohms (1 x 10
8
)
OFF
ON
1 Gigohm (1 x 10
9
)
Switch 3 Switch 4 LOW Limit Resistance
ON
OFF
100 Kilohms (1 x 10
5
)
OFF
ON
750 Kilohms (7.5 x 10
5
)
default setting
DIP switches 3 and 4 control the LOW test limit.
NOTE: At 1 Gigohm high limit resistance, a dirty foot
plate could result in a false pass. Be sure to keep the
foot plate clean particularly when using this setting.
This setting is not suitable for relative humidity greater
than 50%.