Ectron 451, Instruction Manual

Page: 17 / 74

SECTION III
OPERATION
MODEL 451
GENERAL
The Model 451 operates in three completely independent measurement modes: gain, example,
and scale, one of which is always active. When activating one mode, the other two are
automatically deactivated. All settings in each mode are retained in nonvolatile memory,
and none is used by the other two modes. For example, all three modes have a transducer-
sensitivity setting, so there are three settings retained in memory.
Additionally, the Model 451 allows the user to control zero, autozero, excitation, input filter,
cal, units of measure, and to perform a complete alignment, both input and output.
VIEW ANGLE
Because the temperature at which the Model 451 is operating can affect the display, the
ability to quickly adjust the view angle (contrast and brightness) has been incorporated into
the Model 451. When power is on, from any screen (even if the screen is blank or dark),
press and hold the display for more than two seconds. Then turn the encoder (clockwise to
darken, counterclockwise to lighten) until the screen is adjusted for best contrast and bright-
ness. Thirty degrees (encoder clicks) of control are provided. When it is right, press the
display. The Model 451 will not “ time out” from this screen.
CONNECTIONS and ENCLOSURES
The Model 451 uses a “ D” subminiature fifteen-pin connector for all input and output
connections. Table 3-1 summarizes these connections, and Figure 3-1 shows a typical LVDT
connection to the Model 451.
Table 3-1
Connections
Pin Function Pin Function Pin Function
1 Plus input 6 --- 11 Output low
2 Minus input
7&8* Power
12 ---
3 --- 13 Case
4 Output high 9 Guard (shield) 14
Excitation
common
5
Remote
autozero
10 Excitation high 15 Power common
* Internally connected
3-1