EIP 545A - Theory of Operation

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After pressing the first

[

the display will show the temporary entry, like DAC

but the three

decimal points will still show the previous DAC status.

After pressing the second

the display will show the new entry, like DAC

X X

and the three decimal

points will move to the new places. The DAC output will start to be updated accordingly. Release of the

button pressed will return the display back to normal frequency display.

Any wrong key pressed will result in displaying ERROR 10. The operator must restart the key sequence

to enter the correct data.

CLEAR

To clear display from DAC data, ERROR display, or ignoring half-sequence entered, press

Display will return to normal and DAC status will not be changed.

DISPLAY

DAC DATA D AC

To shut off DAC press

]

CLEAR

REhllOTE OPERATION

For remote operation through GPlB refer to the GPlB (Option 08) section of this manual.

For remote operation through BCDIRMT refer to the BCDIRMT (Option

07) section of this manual.

THEORY

OPERATION

A simplified block diagram of the DAC board

shown in figure 01-1.

REFERENCE

bit

BCD DAC

VOLTAGE

ADDRESS DATA COUNT

BUS BUS BUS

FROM MICROPROCESSOR

Figure 01-1. DAC Board, Simplified

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