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6.0 Calibration Procedures
The 3M™ Wrist Strap Tester 746 cannot be adjusted,
but the following steps can be used to determine that the
tester is operating within its specification.
Equipment needed:
1. Resistance Substitution Box
(750 k
Ω - 11 MΩ, tolerance < 2%)
2. 2 leads (to connect the resistance box)
Wrist strap test circuit check:
Connect the resistance substitution box to the 746 as
shown in figure 2.
Set the resistance substitution box to each value of
resistance indicated in the test table and press contact
plate A.
The LEDs will indicate as shown below if the unit is
functioning within specifications.
Resistance
substitution box
settings
Resistance
range of
the 746
LED
indication
*750 kΩ
900 kΩ
750 kΩ
red
green
9.0 MΩ
11.0 MΩ
10 MΩ
green
red
*This example is used in figure 2.
746
wrist strap tester
o.k.
o.k.
A
700 k
900
k
9.0
M
11.0
M
Resistance substitution box
Crocodile clip
f
igure 2