Section
Theory of Operation
This section describes and
(refer
Fig.
the plug-in block diagram;
including signal flow and control flow. This section also discusses the power
plug-in,
Block Diagram Description
Signal Flow
The
and CH 2 Amplifier circuits are identical, therefore this section
only the CH Amplifier.
The display of a signal begins with the inputting of a signal directly to lhc CH input
connector (perhaps with a probe) and proceeds
follows:
CH input connector CH 1 Attenuator
CH Aux Signal
CH I Amplifier CH
Signal
CH Display Signal
The input coupling mode is either AC, DC, or Off. In the AC and DC coupling
modes, the input signal is coupled to the Attenuator. In the Off Coupling mode, the
signal path is open.
During self-calibration, the mainframe supplies the signal to the CH 1
The CH I
contains resistive dividers, capacitive dividers, an ac coupling
capacitor, relays, and a buffer amplifier. The CH 1
.
ing and bandwidth limit
The plug-in contains a microprocessor (MPU) that communicates with
main-
frame. The MPU also constantly monitors the input Overload Sense and the Probe
Data communication lines.
operation of the MPU is through the internally
stored program in its read only
(ROM). The MPU
the plug-in cali-
bration constants in random access memory (RAM). A battery backs-
.
the
calibration constants arc
lost upon power-down. Also,.’
when powering-down, the mainframe stores the oscilloscope’s settings.
the
system ro-powers, the mainframe restores and transmits those settings lo the
in.
The
with the mainframe through a peripheral called the
Housekeeper. The Housekeeper converts the S-bit data
from the MPU into a
serial data signal. This signal is sent to the mainframe. Conversely, the
converts the serial data signal from the mainframe into g-bit data
for
the
to read. The MPU stores the channel switching sequence in the
analog control voltages.
The MPU uses an analog-to-digital (A/D)
to read the value of the Over-
load Sense and Probe Data lines. The AID converter is also used in the Self-Tests.
of Operation- IA32
4-x
Summary of Contents for 11A32
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