Fluke Biomedical 190N - Manual (Page 11)

Operation
Operation
2
2-1
WARNING
Section 2
Operation
An electrical shock hazard exists between the high
voltage supply and ground.
2.1 Operation
The 190 can operate in Rate Mode and display in CPM and mRem /hr units. In Integrate mode the 190
can display in Counts or mRem. Comparable SI units are also provided. The “Mode” button is used to
toggle among allowable display units.
While surveying, should a neutron flux above nominal be observed, the operator can detach the probe
from the Model 190 readout and move away from the area by the length of the cable. A standard and two
longer length cables are available.
In addition to being a survey meter, the probe can be used as a area monitor by purchasing a Model
190AC which is an AC powered version of the Model 190. This eliminates the dependence on batteries.
2.1.1 Time constants
The Model 190 has the capability of acquiring and displaying data with either 24, 12, 6, or 3 second time
constants. The time constant is adjustable by momentarily pressing the “Response Time” button. It is
recommended to use the largest time constant in the lowest rate mode.
2.1.2 Integrate / Rate Mode
Normally surveys are taken in the rate mode, however, the Model 190 can switch between the rate and
integrate mode with the push of the “Rate/Integ” button. The integration starts upon instrument turn on,
and both the integration time and the integrated value are displayed. Should a reset of the integration be
desired, it can be accomplished by holding down the “Resp Time” button for longer than 3 seconds. The
integration will reset and re-start upon let up of the button. Please see the Model 190 manual for a more
detailed discussion.
2.2 Operational Checks
The Model 190 self checks upon turn on.