AH 2550A Automatic Capacitance Bridge 1 kHz

AH 2550A Automatic Capacitance Bridge 1 kHz

Superior capacitance measurement of unmatched precision   

AH 2550A Automatic Capacitance Bridge 1 kHz   

The Andeen-Hagerling AH 2550A measures capacitance and loss in medium and high impedance ranges.

Both capacitance and loss ranges cover negative values to allow for unusual samples or three-terminal networks, and three-terminal BNC connections minimise connector costs and number of cables.

The unmatched precision is the result of a uniquely designed ratio transformer: the culmination of decades 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.


  • Single digit ppm accuracy
  • Resolution of 0.8 aF
  • Deviation measurements of capacitance, loss, or both
  • Autoranging
  • Stability better than 0.5 ppm/year
  • Temperature coefficient of 0.01 ppm/°C
  • Largest measurable capacitance is 1.5 µF
  • Measurement of extreme low loss
    • Dissipation factor: 1.5 x 10-8 tan δ
    • Conductance: 3 x 10-7 nS
    • Resistance: up to 1.7 x 106
  • Full precision measurements in under ½ s
  • Repeat measurements in less than 40 ms
  • Commutation (test signal reversal) to minimise external power line or other periodic signal pickup
  • 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
  • Zero correction of test fixture capacitance and loss
  • External DC bias up to ± 100 volts
  • External trigger capability
  • Real-time clock
  • High reliability digital circuitry
  • Test diagnostic suite
  • Superior line-related noise rejection
  • Calibration free and temperature independent digital phase-shifting circuitry
  • Fully alphanumeric front panel display
  • IEEE-1174 standard serial interface
  • Minimum setting of 0.3 mV for the upper limit of test signal voltage


A number of papers have been published by scientists around the globe who have used an AH2500/AH 2550A Automatic Capacitance Bridge within their research. Here are some examples:


Go to... Andeeen-Hagerling website

Product Code: Andeen-Hagerling AH 2550A

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