AH TTA1 Two-terminal to Three Terminal Adapter


AH TTA1 Two-terminal to Three Terminal Adapter

The AH TTA1 test adapter provides the means to connect ARCO SS-32 and GR1409 style two-terminal standard capacitors to a three-terminal bridge or meter. It also accommodates leaded components and other capacitors having banana plugs with standard spacing. The adapter can be used with Andeen-Hagerling Capacitance/Loss Bridges or with other commercial test instrumentation using three- or four-terminal connections. Prior to the introduction of the AH TTA1, the GR1620 capacitance bridge1 provided the only standardized commercial fixture to measure two-terminal standard capacitors.


  • Flip of a locking switch allows GR1409 standard capacitors to be measured in either two- or three-terminal mode 
  • Three- or four-terminal BNC jacks accommodate connection to a bridge or meter
  • 5-Way binding posts provide convenient connections to ordinary leaded components 
  • Orientation-dependent labeling helps to guide the proper insertion of standard capacitors
  • Emulates GR1620 defacto standard connection configuration for making two-terminal standard capacitor measurements
  • Additivity of capacitance of stacked GR1409 capacitors is optimized for accuracy
  • Full three-terminal shielding of all internal connections 
  • Three year warranty

Connector type to bridge or meter:

Two pairs of BNC jacks. A three-terminal connection uses one of each pair.

Connector type to standard capacitor:

Three 5-way binding post banana jacks with standard spacing (0.75 inch or 19 mm)

Test Cable: The AH TTA1 is compatible with the cables supplied with AH bridges.

Nominal stray High-to-Low capacitance and loss:

Two-terminal mode: 0.18 pF, D < 0.001@1 kHz, Three-terminal mode: 0.17 pF, D < 0.001 @1 kHz

Stray High-to-Low capacitance and loss with banana jacks fully shielded:

Two- and three-terminal mode: < 3 aF, < 0.00002 nS @1 kHz

Nominal High terminal capacitance to ground:

Two-terminal mode: 12 pF @1 kHz, Three-terminal mode: 8 pF @1 kHz

Nominal Low terminal capacitance to ground:

Two- and three-terminal mode: 7 pF @1 kHz

Measurement modes: Two- or three-terminal using a manual switch.

All measurements connect the High and Low terminals of the capacitance bridge to the L and H terminals of the GR1409, respectively.  In two-terminal mode, the G terminal of the GR1409 is connected to the High terminal of the bridge. In three-terminal mode, the G terminal of the GR1409 is grounded. For Arco SS-32 standard capacitors, there is little difference between two- and three-terminal modes since these capacitors have only two terminals.

Power requirements:


Temperature range:

-40° to +75°C while operating or in storage


0 to 85% operating and storage relative humidity, non-condensing.


The adapter is 2.5 inches (6.4 cm) high, 4.0 inches (10.2 cm) wide and 6.5 inches (16.5 cm) long.


1.1 lbs (0.5 kg)

Safety and EMC conformity:

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


The AH TTA1 is covered by a three year warranty. Forward and return shipping is covered during the first three months of the warranty.

Inquiry Form

Are you interested about this product or want you to know more informations? Contact us.

Name: *
Email: *
Company or organization name:
Phone number:
Question or request: *
Actual year:
* Required items