3M Workstation Monitor 724, Руководство пользователя

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The 3M
™
Workstation Monitor 724 allows for the selection of test voltages (9V
or 16V) and resistance limits (10 Megohms or 35 Megohms).
The additional ranges have been added to accommodate global electrical static
discharge requirements. Selection of the operating parameters are left up to the
user’s discretion (See Section 4).
Operator Monitoring: Single and Dual
The wrist strap monitoring function is
activated by plugging a wrist strap dual
conductor ground cord into either one
of the jacks on the 3M
™
Dual Conductor
Remote Input Jack 732 and 733. If the
resistance of the wrist strap loop is within
the limits of the selected range (1.5
Megohms to 10 Megohms or 1.5 Megohms
to 35 Megohms) on the Workstation
Monitor 724, the cord, the wrist band, and
the contact to the arm of the wearer, it is
considered to be functioning correctly. At
this time, one of the (OK) green lamps (1
or 2) will be illuminated on the front of the
monitor.
The wrist strap of the second operator is measured in the same way.
Operators are identified by the two (OK) green lamps (1 & 2). However, the
same high wrist strap red lamp (H) and low yellow (L) lamps illuminate when a
fault is detected. The green lamp that extinguishes identifies the operator that
is experiencing the fault condition.
If the resistance of the wrist strap loop is higher than the selected range (10
Megohms or 35 Megohms) on the Workstation Monitor 724, an (OK) wrist strap
green lamp (1 or 2) extinguishes, and a high wrist strap red lamp (H) illuminates
with an audible alarm. This is an indication of a high resistance in the cord band,
or poor contact between arm and band. If the resistance in the loop is under 1.5
Megohms, it is an indication of a low resistance meaning one or both current-
limiting resistors are bypassed. The low yellow lamp (L) will flash and an (OK)
green lamp (1 or 2) will remain illuminated.
Figure 3 – 3M
™
Workstation Monitor 724
Faceplate
Resistance High Operator
Resistance Low Operator
OK #1
Operator
OK #2
Operator
Resistance High
Work Surface