Service Guide E8364-90026 5-31
PNA Series Microwave Network Analyzers Theory of Operation
E8362B, E8363B, E8364B Digital Processing and Digital Control Group Operation
Front Panel Subgroup
The front panel subgroup contains the following assemblies:
• A1 Keypad Assembly
• A2 Display Assembly
• A3 Front Panel Interface Board
A1 Keypad Assembly
The A1 keypad assembly provides user interface to the analyzer. The front panel rotary
pulse generator (RPG) knob is not electrically connected to the keypad, but rather provides
user inputs directly to the front panel processor.
A2 Display Assembly
The A2 display assembly contains an 8.4-inch LCD with associated drive circuitry and
backlight inverter. Two cables between the A2 display assembly and the A3 front panel
interface board provide all necessary power and data for normal operation. The two cables
are:
1. A cable to the inverter that supplies buffered power.
2. A cable to the display circuitry that supplies decoded data from the video processor on
the A15 CPU board and the necessary drive circuit power. The video data received from
the A15 CPU board includes the following:
A3 Front Panel Interface Board
The A3 front panel interface board detects and decodes user inputs from the A1 keypad
assembly and front panel knob, and transmits them to the A15 CPU board by way of the
A14 system motherboard. It also decodes video data from the video processor on the A15
CPU board and supplies this to the A2 display assembly. Power from the power bus on the
A14 system motherboard is buffered and routed to the A1 keypad assembly and the
A2 display assembly. All data and power signals are routed through a single cable
connector to the A14 system motherboard.
The A3 front panel interface board also includes the following items:
• digital TTL horizontal sync • digital TTL blue video
• digital TTL vertical sync • blanking
• digital TTL red video • data clock
• digital TTL green video
USB A universal serial bus (USB) jack (an industry standard 4-pin connector).
Probe Power Two identical connectors (fused inside the instrument) that supply power to
an active probe for in-circuit measurements of ac circuits.
Speaker A speaker that emits the audio signals received from the A15 CPU board.
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