CH-14A precision decade capacitance box

CH-14A precision decade capacitance box is a variable standard measuring instrument. Its capacitance can be changed from 0.1pF to 0.1111110µF at a step of 0.1pF. The capacitance box adopts a special three-terminal changeover switch. When one of standard capacitors is connected to testing circuit, all of other standard capacitors can be shorted and connected to ground. This design can eliminate all of interference and instability from unused capacitors. This capacitance box has negligible zero-switch capacitance. Therefore, its minimum capacitance range can be lowered to 0.1pF, which is very useful for fine tuning capacitance at 0.1pF step.

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Calibration conditions

 

Ambient temperature: (23±2)℃

Relative humidity: (50±10)%

 

Operation conditions

 

Ambient temperature: 10℃ to 40℃

 

Specification

 

1. Capacitance range:     0.1pF~0.1111110μF

 

2. Minimum step size:     0.1pF

 

3. Digits of reading:     Six-digit decimal system

 

4. Zero-switch capacitance:     <0.00005pF

 

5. Accuracy:     ±(0.05% +0.00005pF)

 

6. Temperature coefficient: 

    ≤30ppm/℃  from  0.1pF~10pF

    ≤20ppm/℃   from  10pF~100nF

 

7. Stability:     200ppm per year from 0.1pF~100nF

 

8. Output mode:     Four-terminal output ( or Three-terminal output )

 

9. Calibration frequency/operating frequency (f):     1,000Hz

 

10. Maximum voltage (U):     ≤100V

 

11. Dimension:     450mm×350mm×140mm

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