TB-9055
Page 2 of 6
© 2016 DESCO INDUSTRIES, INC.
Employee Owned
Power Adapter Connection
Connect the circular plug of the power adapter into the
power jack on the back of the unit.
Mounting
Determine the mounting location of the Wrist Strap
and Ground Monitor. Attach the unit using one of the
following recommended methods:
•
Screws
•
Dual Lock Reclosable Fastener
Note: The unit can be mounted upside down from the
current orientation of the front and back covers. If you
wish to change the orientation, rotate the printed circuit
board and covers 180 degrees. This will allow the unit
housing to be mounted from the wider plate with screw
slots.
Operation
Ground Impedance Alarm Level
Use the set switch and select through a combination
of LED patterns on the front of the monitor to set the
alarm level. The alarm level can be set to 1-10 ohms in
1 ohm increments. It can also be set to 10-20 ohms in
2 ohm increments. The two monitoring lines are set to
the same selected impedance value. If the measured
impedance on a line is lower than the setting, a green
LED will remain illuminated for that line(s). If the
impedance is higher than the preset level, a red LED
and audible alarm are activated for that line(s). Their
alarm duration will be on momentarily to prevent missing
a short increased resistance event. If the impedance
level remains above the preset alarm level, the red LED
and audible sound remains on.
Note: The Wrist Strap and Ground Monitor must be
grounded in order to properly monitor the ground
integrity of metal tools.
Person Voltage and Resistance Monitor
The alarm level is monitored when a person is wearing
a dual conductor wrist strap assembly and plugged into
the front jack. There is a short hold on the body voltage
alarm so that it is not missed. The unit will respond
to either a positive or negative voltage. The alarm is
activated when the wrist strap is worn too loosely and
the loop resistance level is exceeded. The red LED
indicates the resistance limit without a voltage being
generated on the person at the same time. The green
LED indicates a proper connection of the operator. A
green LED plus a blinking red LED will indicate if there
is a body voltage generated; the operator may still be
connected properly. The green LED is off when a dual
conductor ground cord is not plugged into the jack.
Enabling and Disabling Audible Alarm
The audible alarm can be enabled or disabled by
momentarily pressing a recessed miniature push-button
“Set” switch located on the back of the unit while the
monitor’s power is on. Use a paper clip to press the
switch. One short beep on power up means that the
sound is disabled. A series of two short beeps means
that the sound is enabled.
Enabling or Disabling Monitoring of Ground Line
In some instances, the monitor’s tool ground channel
may not be needed. This procedure will disable the
GND1 terminal. The power adapter should not be
plugged in at this time.
•
Ground the monitor using the ground terminal at the
back of the unit
•
Ensure that nothing is connected to the GND1
terminal
•
Press and hold the “Set” button using the end of
a paper clip. While the button is pressed inward,
connect the power adapter and then release the
“Set” button.
•
Wait for approximately 30 seconds. The Wrist Strap
and Ground Monitor will beep during this time. After
this, it will produce one beep and will automatically
disable the GND1 terminal to which nothing
was connected. You can repeat this procedure
whenever the need to disable or enable the GND1
terminal is required.
Setting Impedance Alarm Levels
By default, the Wrist Strap and Ground Monitor is set at
the factory to 10 ohms alarm level. Follow the procedure
below to change this setting.
•
Repeat the steps above in Enabling or Disabling
Monitoring of Ground Line section.
•
Right after the beeping stops, continue pressing
the “Set” button until the desired impedance level is
acheived. See the following table.
•
When the beeping stops, the four left most LED’s
will allow for the setting of the resistance value. The
GND red LED is located at the top; the green LED is
located at the bottom.
•
Select the ground resistance value by pressing the
“Set” button to advance the resistance limit. Turn
the LED’s on or off as indicated in the following
table.
•
Save the desired setting by not pressing the “Set”
switch for about 7 seconds.
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