Ectron 441A, Инструкция по эксплуатации, Страница: 17 / 74

Section III
Operation
GENERAL
In this section, connections to the Model 441A and the use of its controls are discussed.
The name frequency-to-voltage converter is somewhat misleading in that the real value of
this instrument lies not in its ability to measure frequency—instruments dedicated to that
task do it better—and produce a corresponding voltage output—some frequency-measuring
instruments do this, too—but in its ability to rapidly respond to changes in frequency and
faithfully to produce a corresponding voltage. A more suitable name for the product then
could be “ a change in frequency producing a corresponding change in voltage” converter.
This is awkward, so we shorten it.
CONNECTIONS
The Model 441A uses a “ D” subminiature fifteen-pin connector for all input and output
connections. Table 3-1 summarizes these connections. These pin assignments are the same
as for Ectron Models 352 and 428 conditioner-amplifiers. Therefore, unless special features
have been incorporated that would preclude using the Model 441A, enclosures designed for
these amplifiers are compatible with the Model 441A including Models E408 and R408.
The Model 441A accepts power from 10.5 V dc to 32 V dc, so enclosures designed for
either 12 V dc or 28 V dc can be used.
OPERATIONAL-STATE DIAGRAM
Figure 3-1 is the operational-state diagram for the Model 441A. Starting at the top of the
diagram all possible screens and operator choices at these screens are depicted. Additionally,
it shows decisions made by the unit during normal operation. These decisions are diagnostic
in nature; and if an error (such as a memory error) occurs, the user will be notified on the
screen of the event.
Table 3-1
Connector-pin Assignments
Pin Function Pin Function Pin Function
1 Input high 6 --- 11 Output low
2 Input low 7*
Power high
12 ---
3 Digital output high 8* 13 Case ground
4 Analog output high 9 Input guard 14 ---
5 --- 10 --- 15 Power low
* Pins 7 and 8 are internally connected.
3-1