Victoreen 190
Operators Manual
2-2
The counts per minute mode does not require a
calibration adjustment because its time base is
based on the highly accurate crystal clock of the
microprocessor. All other displayed values (e.g.,
mR/h and Sv/h) can be derived from the counts per
unit time value if a suitable calibration constant is
used.
Above 384,000 CPM, the counts in a time slot are counted and the value multiplied by the appropriate
factor to determine the actual count rate, which may cause a reduced accuracy specification on the fifth
and sixth scales.
Figure 2-1. Model 190 Block Diagram
NOTE
Micro-
processor
PROM
RAM
EEPROM
Analog
Display
Driver
Digital
Display
Driver
Front
Panel
Keypad
Counter
HV
Supply
EEPROM
Probe
GM Tube
Power
Supply
Display
Communicator
Microprocessor I/O
and BUS
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