Capacitance measurement of unmatched precision
AH 2500 Automatic Capacitance Bridge 1 kHz
The Andeen-Hagerling Model 2500A measures capacitance and loss in medium and high impedance ranges, and thus allows using three-terminal rather than five-terminal connections to the unknown.
Its unmatched precision is the result of a uniquely designed ratio transformer: the culmination of 15 years of Andeen-Hagerling bridge design and manufacture. Equally important is the unique temperature-controlled, fused silica capacitance standard which allows extremely high measurement stability and immunity to mechanical shock.
These elements combine to form a true bridge operating at 1 kHz to give capacitance results which are independent of the exact test frequency.
Key features
- Includes Option E for enhanced performance as standard
- Accuracy of 3 ppm
- Stability better than 0.5 ppm/year
- Resolution of 0.5 aF and 0.07 ppm
- Temperature coefficient of 0.01 ppm/°C
- Measures extremely low loss:
- Dissipation factor: 1.5 x 10-8 tan δ minimum
- Conductance: 3 x 10-7 nS minimum
- Resistance: 1.7 x 106 GΩ maximum
- Full precision measurements in < 0.5 s, and repeated measurements on the same sample in under 40 ms
- Capacitance and loss ranges cover negative values to allow for unusual samples or 3-terminal networks
- Three-terminal BNC connections minimise connector costs and number of cables
- Commutation (test signal reversal) to minimise external power line or other periodic signal pickup
- Autoranging
- IEEE-488 and RS-232 interfaces included. External device can serve as controller or logger
- Programmable features can eliminate the need for an external controller
- Full or abbreviated English language commands and error messages
- Large, variable brightness, eight digit display of capacitance and loss
- Deviation measurements of capacitance, loss, or both
- Zero correction of test fixture capacitance and loss
- External DC bias up to ± 100 volts
- External trigger capability
Andeeen-Hagerling website
AH2550A datasheet
