7
Taking a Timed Count
When a timed count is taken over a longer period, the average count per minute is more accurate, and any small increase
is more significant. For example, if one 10-minute average is one count higher than another 10-minute average, the
increase may be due to normal variation. But over 12 hours, a one-count increase over the 12-hour background average
may be statistically significant.
The Inspector
+
can give you a total count for a timed period from 1 minute to 24 hours. For a timed count of less than one
minute, watch the seconds countdown on the display. You can manually shut off the timer at any point.
Follow these steps to take a timed count:
1. With the Inspector
+
turned on, set the Mode switch to
Total/Timer
and the timer switch on the end panel to
Set
. The
timer Hourglass and the SET icon appear on the display and the value is set to 00:01(1 minute).
2. Use the “+” and “-” buttons to adjust the timing period. The timed period can be set for 1 to 10 minutes in one-minute
increments, for 10 to 50 minutes in ten-minute increments, or for 1 to 24 hours in one-hour increments.
3. Set the Timer switch to
On.
The Inspector
+
beeps three times and starts counting. The hourglass icon flashes during
the timed period.
If you want to see how many minutes remain, set the Timer switch to Set. The display counts down from the time
setting in hours and minutes to zero. For example, if the display says 00:21, 21 minutes remain. During the timed
period, you can switch back and forth between
Total/Timer
and the dose rate modes without interrupting the timed
period. The hourglass indicator will show in any mode setting and will blink while the timer is totaling.
4. At the end of the timed period, the Inspector
+
beeps three times, and repeats the beeping several times over fifteen
seconds. The number displayed is the total count.
5. Set the Timer switch to
Off
to return to normal operation.
To find the average counts per minute for the timed period, divide the total by the number of minutes.
6. To reset the timer to take another timed count, move the timer switch to the Off position and then to the On position.
The instrument will retain the timer setting of the last entered time.
Using Dose Rate Modes While Timer is On
Dose rate modes can be used while the timer is on. In any dose rate mode, the hour glass indicator will continue to flash
during a timed period. At the end of the timed period, the hour glass will remain continuously on and the timed reading is
held in the Total/ Timer mode.
Taking a Total Count
The timer can take timed counts of up to twenty-four hours. In certain situations, you may want to take a total count
without the timer; for example, taking a count for longer than twenty-four hours. Follow these steps:
1. Place the Inspector
+
in the location where you plan to take the count.
2. Note the time.
3. Immediately when you note the time, set the mode switch to
Total/Timer.
4. At the end of the time period, note the time and the number of counts on the numeric display.
5. Subtract the starting time from the ending time to determine the exact number of minutes in the timing period.
6. To get the average count, divide the total counts by the number of minutes in the timing period.
Using The Alert
The Alert can be set in mR/hr or cpm. When using Utility Menu option #2 to switch units of measurements, the alert is
reset to the default alert level of .1 mR/hr (1.0
µ
S/hr). Once the alert threshold is reached the beeper will sound until the
alert is deactivated, or the radiation level drops below the set alert threshold.
1. To set the Alert, press the "SET" button on the end panel. The "ALERT" icon (radiation symbol) and the "SET" icon
are displayed.
2. Use the "+" and "-" buttons to adjust the display to the desired level.
3. Press the "Set" button once to retain the setting in memory. Then press it again to turn the alert mode on. The
"ALERT" icon is now displayed to indicate the instrument is operating in the Alert mode.
4.
To use the previous alert setting, press the set button twice. Now the alert mode is on.
5. To deactivate the Alert mode, press the "Set" button again. The "ALERT" icon is no longer displayed.
Utility Menu
The Utility Menu allows the user to change default settings for several operating parameters. Once a setting is changed, it
remains in effect unless they are changed through the Utility Menu.
1. To activate the Utility Menu, hold down the “+” button while turning the instrument on. The display will show the
"MENU" icon. Release the “+” button and a “1” indicating option 1 will appear along with the “Menu” icon.
2. Scroll through the menu by pushing the “+” or “-” buttons.
Содержание Inspector EXP+
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