50Hz-20kHz Ultra-precisionCapacitance/Loss Bridge

  • Product No:AH 2700A
  • Manufacturer:Andeen-Hagerling, Inc.

The AH2700A measures capacitance and loss in medium- and high-impedance ranges, and thus allows using three-terminal rather than five-terminal connections to the DUT (Device Under Test). Its unmatched precision is the result of a uniquely designed ratio transformer which is the culmination of over 40 years of 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 50 Hz - 20 kHz to give capacitance/loss results which are independent of the exact test frequency.

  • Measures extremely low loss down to a dissipation factor of 1.5x10-8 tan d, a conductance of 3x10-7 nanosiemens or a resistance up to 1.7x106gigohms

  • As little as 0.4 second required for full precision measurements and as little as 30 ms required for repeated measurements on the same sample
  • Fast analog output has a frequency response of 3 kHz at 3 dB down
  • Negative capacitance and loss ranges measure negative values to allow for unusual samples or three terminal networks
  • Commutation (test signal reversal) to minimize external power line or other periodic signal pickup
  • Three terminal BNC connections minimize connector costs and number of cables
  • IEEE-488 GPIB and IEEE-1174 serial interfaces included; remote device can act as controller or logger
  • Programmability can eliminate the need for an external controller
  • Large, variable-brightness displays having 8 digits for capacitance and loss and 5 digits for frequency
  • 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
  • NIST or NPL traceable calibration
  • Autoranging
  • Automatic internal calibration
  • Self-test diagnostics on power-up and by command
  • Three year warranty

FrequencyAccuracyStabilityTemperature 
Coefficient
Resolution
kHzppmppm/yearppm/°CaFppm
0.1±9±<1.9±0.07160.8
1±5±<1.0±0.0350.80.16
10±11±<1.9±0.072.40.5

Front Panel Display Limitations:

(The front panel display may further limit the range and resolution of the capacitance and loss.)

Capacitance: 0.1 aF is best display resolution for C and CS.

Loss: G: 10-7 nS is best conductance display resolution.

D: 10-7 is best dissipation display resolution.

RS: 10-7 kΩ is best series resistance display resolution.

RP: 10-7GΩ is best parallel resistance display resolution.

Remote Device Reporting Limitations:

Capacitance: 0.01 aF is best resolution for C and CS.

Loss: G: l0-8 nS is best conductance resolution.

D: 10-8 is best dissipation resolution.

RS: 10-7 kΩ is best series resistance resolution.

RP: 10-8 GΩ is best parallel resistance resolution.

Frequencies: 50, 60, 70, 80, 100, 120, 140, 160, 200, 240, 300,

400, 500, 600, 700, 800 Hz and 1.0, 1.2, 1.4, 1.6, 2.0, 2.4, 3.0,

4.0, 5.0, 6.0, 7.0, 8.0, 10, 12, 14, 16 and 20 kHz ± 0.0025%.

Sensitivity to changes in power line voltage:

Capacitance: ± 0.002 ppm per 1% change in line voltage.

Loss: Not measurable.

DC Bias: Up to ±100 volts may be applied to the DUT through the external DC bias input.

AC Test Signal Voltages: Any voltage from 0.0003 to 15 V may be entered to a resolution of 0.1%. The available ranges for a given entered voltage are on the line in Table 1 having the next highest voltage. The AH2700A will automatically use the lesser of the user's selected voltage or the highest voltage listed

in the table which provides sufficient range to be able to measure the capacitance and loss of the DUT. The voltages listed have tolerances of ±5%.

Temperature range: 0° to 45°C while operating

-40° to +75°C while in storage

Humidity: 0 to 85% operating relative humidity, non-condensing.

0 to 60% storage relative humidity, non-condensing.

Power requirements: 25 watts, 48 to 440 Hz, 85 to 115, 102 to 138, 187 to 253 and 204 to 276 volts rms

Packaging: The instrument is 3.5 inches (8.9 cm) high and 15 inches (38.1 cm) deep behind the front panel. Hardware for rack mounting and a bail for bench top use are provided.

Weight: 18 pounds (8.2 kg)

Safety and EMC conformity: conforms to EN61326:1998 and EN 61010-1: 1993/A2: 1995

Patents: The AH2700A is protected by U.S. Patent No.4,772,844, 6,204,673 and 6,987,391

Warranty: The AH2700A is covered by a three year warranty.

Forward and return shipping is covered during the first three months of the warranty.