| For each increase in voltage (yellow background in the table below), the current must be dropped to the new lower value before the voltage is increased (yellow bars in table). | |||
| The following times are minimum times. If the vacuum has not decreased to a reasonable level (~80-85mV on the voltmeter/vacuum gauge) or to the level reached at the previous voltage/current setting, then it is better to wait before increasing the voltage or current further. The better the vacuum is, the longer the filament life will be. | |||
| Current (mA) | Voltage (kV) | Time (minutes) for Open vacuum | Time (minutes) for closed vacuum |
|---|---|---|---|
| 10 | 20 | 20 | 5 |
| 20 | 10 | 2 | |
| 30 | 10 | 2 | |
| 40 | 10 | 2 | |
| 20 | 30 | 10 | 2 |
| 30 | 10 | 2 | |
| 40 | 10 | 2 | |
| 50 | 10 | 2 | |
| 60 | 10 | 2 | |
| 20 | 40 | 10 | 2 |
| 30 | 10 | 2 | |
| 40 | 10 | 2 | |
| 50 | 10 | 2 | |
| 60 | 10 | 2 | |
| 70 | 10 | 2 | |
| 80 | 10 | 2 | |
| 20 | 50 | 10 | 2 |
| 30 | 10 | 2 | |
| 40 | 10 | 2 | |
| 50 | 10 | 2 | |
| 60 | 10 | 2 | |
| 70 | 10 | 2 | |
| 80 | 10 | 2 | |
| 90 | 10 | 2 | |
| 100 | 10 | 2 | |
| The maximum voltage and current is 50kV and 100mA for a 0.3mm filament and a copper anode. | |||
Last revised: Monday, 11-Feb-2002 15:38:01 EST