Fluke-biomedical 451P User Manual download pdf (Page 21)

Ion Chamber Survey Meter

Operation

MODE Button

To configure the MODE button to the opposite function without a RS-232

connection, use the following procedure:

1. Turn off the Survey Meter.

2. Press the MODE button.

3. Turn on the Survey Meter while continuing to press the MODE button.

4. Release the MODE button when the display is in the “all elements on”

condition.

5. Use the MODE button to toggle the Survey Meter between the Rate mode

and the newly selected Freeze or Integrate mode.

Freeze Mode

When configured to select the Freeze mode, the MODE button acts as a toggle

switch. Press the button until FREEZE appears on the display. Operation in the

Freeze mode gives the user a constant reference of the highest exposure rate

obtained from the time the freeze function is initialized. The highest reading

appears as a single bar on the bar graph. The current reading continues to

display on the digital display and the bar graph. If a measurement is obtained

which exceeds the freeze bar reading, the freeze bar moves to the higher

measurement point. The operating range of the Survey Meter remains locked on

the highest range attained during the Freeze mode so that the scale and the

multiplier remain the same.

For example, assume the scale units appear as 10, 20, 30, 40, 50, and the

freeze bar is at 47 mR/h on the bar graph. If the Survey Meter then measures a

radiation field of 120 mR/h, the scale units will change to 100, 200, 300, 400, 500

and the freeze bar appears on the graph at 120 mR/h. If the Survey Meter

measurement goes below 100 mR/h, the units on the scale will not change until

the Survey Meter is taken out of the Freeze mode. However, the digital display

continues to show the current reading. The Survey Meter operates in the Freeze

mode until the user toggles the MODE button to return to the normal operating

mode.

Integrate Mode

The Integrate mode is operational 30 seconds after the Survey Meter is turned

on and all of the time after that. However, the integrated exposure displays only

when the MODE button has been configured as a toggle to display exposure

rate/integrated exposure. If the MODE button is pressed within the 30 second

initialization period of the Survey Meter, the display will read “0”.

When integration starts, “0.0 μR” displays. Toggle MODE to read exposure rate

as required.

To reset the integration display, toggle the display from the Rate mode to the

Integrate mode. Keep the MODE button pressed for approximately 5 seconds.

The display will clear, and then read “0.0 μR.” Exposures are accumulated up to

99 R.

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Fluke-biomedical 451P User Manual Page 21

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