Agilent Technologies 8935 Series, Manual

Page: 318 / 343

Chapter 10 317
Block Diagrams
Instrument Control Section
Instrument Control Section
Digital Control
The Test Set’s Digital Control is driven by two assemblies:
• A2A30 Memory/SBRC
• A2A31 Controller
The controller receives user control information by either the A2A70
Control Interface or by the front panel. Operating firmware on the
A2A30 Memory/SBRC is then used by the A2A31 Controller to generate
digital control for the Test Set. The digital control bus information is
passed back to the A2A30 Memory/SBRC which controls most of the
Test Set’s modules and assemblies.
Display
The Test Set’s Display data is first generated by the A7 Controller and
then passed on to the A20 CRT drive. The A20 CRT drive converts the
digital information into analog vertical and horizontal drive signals for
the A22 CRT display. The A20 CRT drive also provides brightness and
contrast signals for the A22 CRT display.