| 摘要 |
PURPOSE:To enable migration always at a constant temp. so that data having reproducibility is obtd. even if thermal environment changes by directly detecting the temp. of the gel medium itself and controlling a high-voltage power supply in accordance with the signal corresponding to the detected temp. CONSTITUTION:The permissible range of the migration temp. is first set and the migration temp. is monitored via a thermocouple 4 by a CPU 8 which monitors both of the high-voltage power supply 7 and a cooling block 2. The voltage is raised until the upper limit of the migration temp. is attained if said temp. is in a permissible range. The specified voltage is maintained until the heat diffuses and the same temp. as the cooling temp. is attained upon attaining of the upper limit. This operation is repeated until the upper limit of the voltage impression is attained and thereafter the specified voltage is maintained. The voltage is once lowered and after the state stabilizes, the voltage is again raised up to the upper limit of the impression if the upper limit tem. is exceeded in the constant voltage state. The migration is thereby effected always in the constant temp. state and the data having the reproducibility is obtd. even if the thermal environment changes. |
