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Operation
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– E650 Series 4 – ZMD400AT/CT, ZFD400AT/CT – User Manual
5.2.1
Display buttons
The two display "down" and "up" buttons are placed on the main faceplate
(top) on the right of the liquid crystal display.
Display
"up"
button
Display
"
down
"
button
Figure 64. Display buttons
By pressing the lower display "down" button, the display changes to the
next value in the list. By pressing the upper display "up" button, the display
changes to the previous value (also see section 5.4.2 "Display menu").
5.2.2
Control of display via optical interface
All E650 meters have an "optical button" in addition to the display "up" and
"down" buttons. The optical interface serves to receive a light signal, e.g.
generated by a torch (works only with warm light, i.e. LED torches cannot
be used for this). The light signal acts like the display "down" button and
controls the display in one direction from one value to the next. This type of
display control only functions when voltage is supplied to the meter.
The reader can also control the display at a distance from the meter
depending on the light intensity from the source, e.g. through a protective
glass in front of the meter.
5.2.3
Reset button
The reset button is situated to the right of the battery compartment behind
the front door. To permit operation of the reset button the front door must
be opened and therefore the utility seal be removed.
The reset button can be used to perform a manual reset. If the display
check is displayed (after operation of a display button), however, pressing
of the reset button produces the service menu (also see section 5.4.3
"Service menu").
Figure 65. Reset button behind front door