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IM133, Page
2.4 OPERATION
The Endevco Model 133 can be manually programmed from the front panel (See Figure 1) by
means of a “Select Channel” push-button, three (3) “Channel LEDs”, a “Select Function” push-
button, seven (7) “Function LEDs” indicating which function has been selected by the “Select
Function” push-button (referred in this document as the “function LED's”), a four (4) character LED
display to show the state of each function, four (4) “EDIT” push-buttons to change the entries in
the LED display, and three (3) LEDs indicating if there are any faults in any of the channels
(referred in this document as the “Fault LED's”).
The unit has two modes of operation: (1) Normal and (2) Query/Programming. In the Normal mode
of operation, the unit can be in (a) Monitoring State, or (b) No-Monitoring State. While in the Normal
mode of operation, the selected state will apply to all three channels simultaneously.
The unit will store the settings for all of the function in its internal memory and at power-up it will
automatically restore the settings from the last session.
2.4.1 Channel Selection
The user selects which channel is being programmed by pressing the “Select Channel” push-
button. Each press of the “Select Channel” push-button will sequentially turn-on one of the 3
“Channel LED's” located to the right of the “Select Channel” push-button indicating the channel
number selected for programming.
The unit will remain in the selected mode/state of operation (normal or query/programming) while
pressing the “Select Channel” push-button.
2.4.2 Normal Mode
1. Monitoring State
In the Monitoring state of operation the unit takes an RMS reading of the signal present at the
output of the selected channel every 500 mSec and displays the value on the LED display in
Engineering Units (EU: the physical variable in RMS being measured by the transducer) or V out
in RMS. This state is activated by selecting either the "EU" or “V out” entry in the "Monitor" Function
selection.
Pressing the “Select Channel” push-button while in the Monitoring state allows the user to quickly
view (sequentially) the signal levels at the output of each channel.
2. No-Monitoring State
The No-Monitoring state allows for low noise operation. This is accomplished by not taking A/D
readings from the outputs, and by placing the CPU in idle mode in order to minimize power
consumption and digital noise in the unit. The LED display will be turned OFF. This state is
activated by selecting the "OFF" entry in the "Monitor" Function selection.
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