Ectron 441A, Instructions Manual, Page: 30 / 74

•
Model E408-6Y has an internal 12 V dc power supply,
and the E408-6X has a power supply of 28 V dc.
•
When setting up the Model E408-6 for operation, refer
to either Drawing 408-600 (for 12 V dc systems) or
408-601 (28 V dc systems) at the rear of this manual
for settings of plug jumper W1 (W2 is not active when
using the Model 441A in this enclosure). Also depicted
are typical input configurations the customer may want
to use.
Model R408-14
The Model R408-14 enclosure is a 14-channel 3-
1
⁄
2
-inch-high,19-inch-wide rack-mount unit
that holds Models 352, 428, 441A, 441AL, and 451 in any combination. It also is powered
by either dc or ac and comes in both 12 V dc (Option Y) and 28 V dc (Option X) versions.
Features
•
Beneath the top cover are terminals for each channel
for bridge completion, 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 R408-14 does
not degrade the specifications of any plug-in.
•
Model R408-14Y has an internal 12 V dc power supply,
and the R408-14X has a power supply of 28 V dc.
•
When setting up the Model R408-14 for operation, refer
to either Drawing 408-605 (for 12 V dc systems) or
408-606 (28 V dc systems) at the rear of this manual
for settings of plug jumper W1 (W2 is not active when
using the Model 441A in this enclosure). Also depicted
are typical input configurations the customer may want
to use.
Operation Model 441A
3-14