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MB801 OPERATION

Specifications

3.520

.750

.100

4.350

3.030

1.100

YELLOW/Alarm

BLUE/ 10-33VDC Power

White/Int. Lighting 28V

BLACK/Ground

427 Hillcrest Way, Redwood City, CA 94062

Phone (866) 369-5588  

  Fax (650) 369-9988

www.davtron.com

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Normal Operation

The SELECT button selects what is to be displayed on 

the four digit window and the CONTROL button controls 

what is being displayed. Pressing SELECT sequentially 

selects UT, Local Time, Elapsed Time and then back to 

UT. The Control button starts and resets Elapsed Time 

when momentarily pushed. Normal operation of the 

MB801 cannot accidentally reset time.

Setting UT (Universal Time)

Select UT for display in the four digit window with the 

SELECT button. Simultaneously press both the SELECT 

and CONTROL buttons to enter the set mode. The tens 

of hours digit will start flashing. The CONTROL button 

has full control of the flashing digit and each button push 

increments the digit. Once the tens of hours is set, the 

SELECT button selects the next digit to be set. After the 

last digit has been selected and set with the CONTROL 

button, a final push of the SELECT button exists the 

mode. The lighted annunciator will resume its normal 

flashing, indicating the UT clock is running.

Setting LT (Local Time)

Select Local Time, LT, using the SELECT button. 

Simultaneously push the SELECT and CONTROL 

buttons to enter set mode. The tens of hours digit will 

start flashing. The set operation is the same as for UT, 

except that minutes are already synchronized with the UT 

clock .

Test Mode

In UT mode hold the SELECT button down for five 

seconds and the display will indicate 88:88 and activate 

all three annunciators.

Elapsed Time Count Up

Select ET for display. Pressing the CONTROL button will 

start ET counting. Elapsed time counts up to 59 minutes, 

59 seconds, and then switches to hours and minutes. It 

continues counting up to 99 hours and 59 minutes. 

Pressing the CONTROL button again resets ET to zero.

Elapsed Time Count Down

Select ET for display and enter set mode by pressing 

both buttons. The countdown timer can now be set. 

Entering the time is identical to UT time setting. When the 

time is entered and the last digit is no longer flashing the 

clock is ready to start the countdown. Momentarily 

pressing the CONTROL button starts the countdown. 

When the count reaches zero the display flashes and the 

external alarm is activated. Pressing either SELECT or 

CONTROL will deactivate the alarm. ET continues 

counting up. Pressing CONTROL again will reset ET to 

zero. 

• Universal Time:

 24 hour format.

• Local Time:

 12 hour format.

• Elapsed Time Count Up:

 Starts in     

   minutes, seconds, then hours, minutes up  

   to 99:59 hours.

• Elapsed Time Alarm:

 Activates at zero 

   when counting down.

• Internal Lighting:

 100 mA at 28V.

• NVIS Lighting:

 Option Green A.

• Keep Alive Current:

 .004 Amps, 28V.

• Voltage:

 28V.

• Warranty:

 1 year.

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