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Multi-Channel Hardware Installation
Overview
This section describes configurations supported by option EMC, Multi-Channel Search. This
supports more than one and as many as four search receiver “channels” in an E3238s system.
The block diagram in
illustrates a four-channel configuration. The tuners’ IF
outputs are digitized by the ADCs. The digitized IF is passed to the signal processor
(E9821A) which converts it from time to magnitude data and passes it to the controller. This
is, effectively, how the system works. This model effectively describes multi-channel
operation.
Figure 57. Block
diagram of a multi-
channel search
system
The N6830A/HF, N6830A/70 MHz IF, and E1439/70 MHz IF configurations incorporate the
fiber-optic FPDP (front-panel data port) interface to get data from the ADC’s to the E9821A.
The E1437 ADC data actually flows through the ADCs to the E9821A as shown in
.
For the E1437 HF solution, the data path is the VXI Local Bus so the ADCs must be installed
adjacent to each other in the mainframe.
Figure 58. Block
diagram showing
actual data flow
Time Synchronous
Measurements
All channels in a multi-channel search system are inherently time synchronous because of the
method used to coordinate the ADC sampling activities.
• One ADC is designated as the “master” and it provides a sample-clock signal and a
measurement-sync signal to all other ADCs in the system.
• The sample-clock and measurement-sync signals may be passed from the master to the
slaves either on the VXI backplane or via the ADC front-panel SMB connectors. The
N6830A/HF and N6830A/70 MHz IF use front-panel SMB connectors only.
• The master may run on it’s internal frequency reference or an external reference may be
provided on the front-panel BNC connector.
Summary of Contents for E3238S
Page 62: ...62 Hardware Installation ...
Page 94: ...94 Software Installation and Configuration ...
Page 198: ...198 Application Resources ...
Page 218: ...218 Multi Channel Hardware Installation ...
Page 242: ...242 Specifications ...
Page 252: ...252 Appendix A d E3238s Listing E3238S Installation ...
Page 268: ...268 Appendix B d e3238s cfg Listing E3238S Installation ...