| 摘要 |
Before a probe (6) of a PESI ion source penetrates a sample (9), the total ion currents when a high-voltage generation unit (12) has not applied voltage to the probe (6) and when the high-voltage generation unit (12) has applied voltage to the probe (6) are each measured. If the probe (6) is appropriately attached to the holder (5), the application of the voltage will ionize components in the air around the tip of the probe (6), and this will affect the total ion current. As a result, there will be a significant difference between the total ion current when voltage has not been applied and the total ion current when voltage has been applied. Meanwhile, if the probe (6) is not appropriately attached, there will be no meaningful difference between the total ion current when voltage has not been applied and the total ion current when voltage has been applied. Using a threshold determined at a normal time as a standard, a probe attachment determination unit (24) detects poor probe (6) attachment by determining the total ion current difference and outputs an error message to a display unit (42) if there is poor attachment. As a result, poor probe (6) attachment and probe (6) removal can be reliably detected and biological sample degradation, and the like, resulting from unproductive measurement and elapsed time can be avoided. |
