3M 725 User Manual - Page 12
Browse online or download pdf User Manual for Measuring Instruments 3M 725. 3M 725 16 pages. Wrist strap monitor
Also for 3M 725: Instructions Manual (15 pages)
Print Page
Equipment Needed
• Resistance Substitution Box (RSB), 1 Ohm to 45 Megohms ± 1%.
• One two-conductor cable with standard 3.5 mm (miniature) phone plug attached
on one end and appropriate connectors on the other end to connect to RSB.
• Two single conductor wires with clip style on one end and appropriate
connectors on the other end to connect to a RSB.
Note: Two conductor cables must have an isolation resistance of >1 Gigohm between conductors.
Two separated wires may also be used to obtain higher isolation resistance.
Procedure
a) Install a new 9 volt battery into the 3M
b) Short the dual conductor ground clip by attaching to a conductive metal
object such as a coin.
c) Plug the phone jack test cord into the wrist strap jack on the front of the
monitor and attach the other end of the cord to the RSB.
Set the RSB as follows and observe the lamp and audible alarm:
29.8 Megohms – Red lamp OFF, audible alarm OFF.
•
40.2 Megohms – Red lamp ON (Flashing), audible alarm ON
•
(Chirping).
d) Connect the two single conductor wires to the RSB. Attach the other ends
of the wires with clips to the metal jaws of the Wrist Strap Monitor Model
725 dual conductor ground clip. Be sure to prevent the clips from contacting
each other. Plug in the phone jack test cord into the wrist strap jack on the
front of the monitor and short the opposite ends together.
Set the RSB as follows and observe the lamp and audible alarm:
5.0 Megohms – Red lamp OFF, audible alarm OFF.
•
11.5 Megohms – Red lamp ON (Continuous), audible alarm ON
•
(Continuous tone).
Wrist Strap Monitor Model 725.
™
11