Ectron 441A, Инструкция по эксплуатации, Страница: 29 / 74

screen has been cleared by pressing the display or press-
ing or turning the encoder.
Operation
Rotate the encoder to select
Y
(yes)
PUSH KNOB
or
N
(no)
PUSH DISP
lay.
Discussion
Only when the user has selected
Y PUSH KNOB
and
has pressed the encoder will a reset be performed. Then
the unit will display the
ALIGNMENT REQUIRED
screen, and the user can proceed as previously described.
ENCLOSURES
Model E408-1
The Model E408-1 is a single-unit mount designed to mount directly to a bulkhead or to a
DIN rail (Option D). It can be mounted on three of its six sides with screws (10-32 machine
screws are recommended) in any aspect. The installed unit can be right-side up or down
within the mount as well. A right-angle hooded DAM-15S connector is provided for cabling.
The hooded shell can be mounted right-side up or down, too, depending on where the user
would like the cabling to exit. Drawing 408-900 shows all unit dimensions as well as mounting
dimensions.
Model E408-6
The Model E408-6 enclosure is a six-channel bench-top unit, which will hold Models 352,
428, 441A, 441AL, and 451 in any combination. Being small, lightweight, and powered
either by ac or dc, the enclosure is well suited for use in the field as well as the laboratory.
Features
•
Inside the top cover, which is held on by four captive
screws, are terminals for each channel for bridge com-
pletion, CAL, and bridge balance (for Model 352).
•
Channel-input and dc-power connectors are PT series,
and output connectors are BNC. An ac power cord and
mating connectors for all but the BNC’s are provided.
•
Front-panel controls include power on-off (for ac and
externally applied dc); ALL ZERO for Model 428
equipped with autozero (Option O); and CAL with po-
sitions of
+
,
−
, and OPR (operate), which is functional
when a CAL resistor and any bridge configuration are
installed or connected. Calibration is input shunt cali-
bration by means of electronically switching a customer-
installed CAL resistor in parallel with selected arms of
the bridge to produce either a plus or a minus calibration.
•
Also included are provisions for bridge balance for units
so equipped and output frequency-response control for
Model 352 amplifier-conditioners.
•
As with all Ectron enclosures, the Model E408-6 does
not degrade any plug-in specifications.
Model 441A Operation
3-13