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EMIT 

- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Website: 

DescoEMIT.com

TB-6557

 Page 3 of 4

© 2011 DESCO INDUSTRIES, INC.

Employee Owned

Light Fixture

*Optional

*Optional

Programable

Logic

Controller

Power Supply

Multi-Ground Hub

Worksurface,

Tool, Cart,

Accessory

Figure 6. Installing the Multi-Ground Continuous Monitor.

TURNING OFF THE AUDIBLE ALARM

If one of the monitored ground channels exceeds its

resistance limit, the monitor’s audible alarm can be

momentarily turned off. This allows you to troubleshoot 

theproblem without the annoyance of the audible alarm. 

Toturn the audible alarm off, press and hold the SET 1 

buttonfor approximately 3 seconds during normal 

operation. Tore-activate the audible alarm, press and 

hold the SET 1 button for approximately 3 seconds. The 

audible alarm will also re-activate itself once the failed 

ground channel reenters the resistance limit.

Calibration

CALIBRATION MODE

I.        Disconnect the power adapter from the monitor.

II.       Disconnect all connections from ground terminals 

          1-8 and relays 1 and 2. Do not disconnect the 

          ground reference from the monitor.

III.      Hold down the SET 1 button and simutaneously 

          power the monitor back up. Within approximately 

          2 seconds, the PRG LED will illuminate and the 

          monitor will enter Calibration Mode.

IV.      The monitor will then calibrate itself to 1 ohm,

          1 megohm, 10 megohms, and 35 megohms for 

          each ground channel.

V.       If the monitor passes calibration, the POWER LED  

          will illuminate blue.

VI.      If the monitor fails calibration, the POWER LED 

          will not illuminate. In this case, follow the steps 

          listed under SELF DIAGNOSTIC MODE.

SELF DIAGNOSTIC MODE

The following steps will help you determine which ground

channel is out of calibration.
I.        Disconnect the power adapter from the monitor.

II.       Disconnect all connections from ground terminals 

          1-8 and relays 1 and 2. Do not disconnect the 

          ground reference from the monitor.

III.      Hold down the SET 2 button and simutaneously 

          power the monitor back up. Within approximately    

          2 seconds, the PRG LED will illuminate and the 

          monitor will enter Failure Indication Mode.

IV.      The monitor will cycle through each resistance 

           limit.

V.       The ground channel LEDs will then illuminate red 

           or green. Green indicates that the limit is within

           calibration. Red indicates that the limit is out of

           calibration.

VI.      Disconnect then reconnect the power to the 

           monitor to return to normal operation.

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