3M 1100 SLM - Technical Information; Principles of Operation; Figure 6: Block Diagram of the Model 1100;2100 S Circuit Board

11 Technical Information
Principles of Operation
056-652, Rev.D 1100/2100 SLM models
Technical Information
Principles of Operation
The Quest model 1100 uses low noise, low power analog and digital integrated
circuitry to ensure long battery life, maximum stability, and superior reliability over
a wide range of environmental conditions. Figure 6 is a block diagram of the
model 1100/2100's internal circuit operations.
Figure 6: Block diagram of the model 1100/2100’s circuit board
FAST
SLOW
Microphone
PREAMP
RMS/LOG
CONVERSION
A
C
v+
v-
1k
AC
OUT
WEIGHTING
FILTER
MICROPROCESSOR
A/O Converter
LCD
DISPLAY
OVERLOAD
DETECT
v+
v-
1k
AC
OUT