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40~1300pF Variable Vacuum Capacitor
| Part No. | VVCC1300/35/796 CV3W-650FB/50 |
| Capacitance | 40~1300pF |
| RF Working Peak Voltage | 35 KV |
| RF Test Peak Voltage | 50 KV |
| Max.RF Current(rms) | 796 A |
| Max.Operating Torque(N.m) | 1.5 |
| Rotation Turns | 38 |
| Diameter | 212 mm |
| Height | 546 mm |
| Maximum Weight | 19 kg |
Can Substituted Jennings CV3W-650FB/50.
Tips of vacuum capacitors：
Quality Factor (Q)
Extremely low losses occur in vacuum capacitors because of the vacuum dielectric, compact construction, and the use of low loss glass or ceramic envelopes as well as copper and precious metal solder construction.Consequently, vacuum capacitors are able to handle large RF currents at high RF frequencies that would destroy other types of capacitors. The "Q"factor, or ratio of stored energy to dissipated energy, is typically in theorder of 1000 or 5000 or higher.
Because Q is a function of frequency,capacity and E.S.R. (Equivalent Series Resistance), it is perhaps more meaningful to consider the value of E.S.R. In modern high power capacitor applications, E.S.R. is significant for determining cooling requirements. The slight loss results from the RF resistance in the copper. Based upon actual tests, the E.S.R. value in not effected by change in capacity, other parameters being fixed. The value of E.S.R. varies over a range of 5 to 20 milli ohms from 2.5 to 30MHz.