Toshiba LF620 Instruction Manual page 87

● For pulse width setting mode, you can select either AUTO or MANUAL.
Depending on this setting, the pulse width setting varies as shown in the table below:
Selection item Pulse width value to be set
After the count rate is set, the pulse width is automatically set
AUTO
to 40% of the period of pulse frequency at 100% output.
Even after the count rate is set, the pulse width is not changed.
* However, if the pulse width becomes out of the setting
MANUAL
Note: If the count rate exceeds 1000 (pulse/s), the pulse width setting mode is limited to the AUTO
mode only and you cannot set the width manually.
● Examples of pulse width setting range
Example 1
In the case the range is 360m
Since the pulse rate is 360 (m
of pulse frequency at full scale is 1ms.
Therefore, the pulse width can be set only to: 1ms × 40% = 0.4ms only.
Example 2
In the case the range is 360m
Since the pulse rate is 360(m
period of pulse frequency at full scale is 1000000ms.
Therefore, the pulse width is: 1000000ms × 40% = 400000ms. However, since the
maximum value is 500ms, the pulse width becomes 500ms.
Example 3
In the case the range is 360m
0ms:
Since the pulse rate is 360(m
of pulse frequency at full scale is 1000ms.
Therefore, the pulse width is: 1000ms × 40% = 400ms. However, since the
maximum value is 100ms in the case of Auto setting, the pulse width
becomes 100ms.
range as a result of count rate setting, the screen is
automatically switched to the pulse width setting screen
after the count rate is set.
3 3
/h (1m /s) and the count rate is 0.0001m
3
/h) / 0.0001(m
3 3
/h (1m /s) and the count rate is 1000m
3
/h) / 100(m3) = 3.6 pulse/h (0.001 pulse/s), the
3 3
/h (1m /s), the count rate is 0.1m
3 /h) × 0.1(m 3
− 86 −
3
) = 3600000 pulse/h (1000 pulse/s), the period
3
and the pulse width is set to
) = 3600 pulse/h (1 pulse/s), the period
6 F 8 A 0 9 2 7
3
:
3
: