Theory of Operation
5–16
1710J-Series Waveform Monitors
The front-panel LEDs are driven in six common banks by U407. U305 provides
a common current drain that is enabled by U407. Data registers in U407 are
written into by the microprocessor over the eight-bit address bus and read out to
front-panel LEDs when WR goes low.
Front Panel, Diagram 6
The front-panel indicators are driven from microcontroller light driver register
and LED drivers from Diagram 5. The front-panel switches are momentary
closure (with some hold for additional function capabilities) that are monitored
by the microprocessor, which is also on the microcontroller (Diagram 5). In
addition a series of front-panel controls provide variable dc operating levels as a
means of compensating for variable operating requirements and conditions.
The front-panel LED indicators are arranged in six columns returned to a current
source by four returns, designated as rows, in order to provide the microproces-
sor with a set of column/row matrix addresses. An LED indicator lights when
there is a complete circuit from the light driver (Diagram 5) through the LED
and back to the light driver.
Switches complete a simple matrix that is read by Port 1 of the microprocessor.
A completed circuit through the processor (switch closure) dictates an output
through the data I/O that changes one or more operating conditions. Some of the
switches are read in two different ways by the microprocessor. When touched
and released they cause the microprocessor to toggle to the next item on that
switch’s menu. When held in, the microprocessor selects a specific operation.
Hold for function switching options are outlined in blue on the front panel.
A set of variable controls consisting of the horizontal position, vertical position,
vertical calibration, scale, and focus controls select a dc voltage level between
+11.8 V and –11.8 V.
The INTENSity control operates in conjunction with the Z-axis control circuit on
Diagram 3. DC levels for Intens 1, Intens 2, and Intens 3 depend on the
operating mode selected, which dictates the level on each of the leads.
LED Drive
Indicators and Switches
Controls
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