Testing Wrist Low Limit – Refer to Wrist Test Table
1.Switch on the 3M™ Shoes and Wrist Strap Tester 747.
2.Select 5 MΩ position on the “Wrist High” switch.
3.Select Wrist position on the “Signal Out” switch.
4.Set reference resistor to 630 KΩ.
5.Press down on the “Touch Panel” and observe LED indicators and value displayed on LCD comparing to Wrist Test Table below.
6.Set reference resistor to 670 KΩ.
7.Press down on the “Touch Panel” and observe LED indicators and value displayed on LCD comparing to Wrist Test Table below.
Testing Wrist High Limits – Refer to Wrist Test Table
8.Repeat test sequence using specified resistors as indicated in Wrist Test Table below for “Wrist High” 5 MΩ, 10 MΩ, and 35 MΩ positions.
Wrist Test Table
Reference
Resistor
Low Limit*
≤630 KΩΩ
≥670 KΩ
High Limit
≤4.8 MΩ
≥5.2 MΩΩ
High Limit
≤9.7 MΩ
≥10.3 MΩ
High Limit
33.9MΩ ≥36.1 MΩ
Wrist High
Range Switch Setting
5 MΩ
5 MΩ
10 MΩ
35 MΩ
Wrist Strap
Check LED Indicator
Red
Green
Green
Red
Green
Red
Green
Red
Test Result
LED Indicator
Low
OK
OK
High
OK
High
OK
High
*Low limit value (650 KΩ) for wrist straps is set internally and cannot be adjusted.
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