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MO 0765-0601
VII. Shoe test
The 741 shoe electrode has to be connected to the
740 shoe jack.
Switch the 740 on. Stand on the 741 shoe
electrode. If you are using shoe straps with 1 M
Ω
resistor on both feet to be tested with the 741 shoe
electrode, you have to test the straps one after the
other, to avoid a red "<" indication. Care must be
taken not to put the non-tested foot on an ESD-
protective flooring to avoid a bypass to ground.
Depress the metal contact plate in the shoe test
area until one of the indicator LEDs is on. The
green LED indicates that the resistance of the
person through the footwear is in the range
between 750 k
Ω
and the desired upper maximum
level (10, 35, 50 or 100 M
Ω
). If the red ">" LED
is illuminated, clean the soles of the shoes or
check shoe grounding system (heel ground or toe
ground strap) and retest. If, after cleaning, the red
">" LED remains on, replace appropriate device.
If the red "<" LED is illuminated, the minimum
resistance of the shoes or shoe grounding system
is below 750 k
Ω
.
Note: Some types of shoe grounding systems are
manufactured with a resistance of less than
750 k
Ω
. These types of systems are used in
various industries such as handling of explosives
or when grounding of personnel through wrist
straps is not practical. Shoe grounding systems
with a less than 1 M
Ω
resistance will indicate with
the red “<“ LED indication on the 740.
The shoe test does not influence the wrist strap
test, therefore the shoes can be tested while the
wrist strap is still connected to the 740 or the wrist
strap can be tested while the operator is standing
on the 741 shoe electrode. Both metal plates
should not be pressed at the same time.
