Sonics VC50 AT (1990) - Manual (Page 7)

7
TUNING
Tune the power supply in accordance with the following procedures each time a new
converter or probe is used.
1. Ensure that the probe is not immersed in the liquid and that it does not come
in contact with anything.
2.
Set OUTPUT CONTROL TO “100”.
3. Set 25-50 POWER MONITOR SCALE SELECT SWITCH to “25”.
4. Set POWER SWITCH to ON, and rotate the TUNE CONTROL clockwise or
counterclockwise until minimum (not maximum) reading (usually less than
30) is obtained on the POWER MONITOR. If minimum reading cannot be
obtained, make certain that the probe is tight. A loose probe will usually
generate a loud piercing sound.
5. Set OUTPUT CONTROL to “60”.
6. Set POWER SWITCH to OFF.
CAUTION
The power supply should be tuned after the probe has reached operating temperature. When working with
low or high temperature liquids, immerse the probe in the liquid for a few minutes, withdraw the probe
out of the liquid, and then, tune the power supply.