2701A Transconductance Amplifier

  • 0 to 100 Amps – AC
  • 0 to ± 100 Amps – DC
  • Voltage Compliance ± 5 Volts
  • IEEE-488 Interface
  • Resistive, Capacitive, Inductive Loads
Features

The model 2701A was originally developed for use in the 2100 series of Power Calibration and DC Resistance Measurement Systems. Fully programmable, the model 2701A can be configured as part of a fully automatic current calibration system to optimize throughput and will drive resistive, capacitive and inductive loads.

When used as a transconductance amplifier, the model 2701A converts a voltage signal applied to the input, into a high-resolution output current whose value is directly proportional to the input signal level. It has 3 ranges of 5, 20, and 100 Amps.

In the DC or Source mode, the model 2701A is bipolar. The source voltage can be selected from the front panel or over the IEEE-488 interface. The DC voltage is generated from a 16-bit DAC. The 2701A uses quick-disconnect high current female terminals for the DC output connections.

Outputs of 100 Amps can be produced over a frequency range of DC to 1000 Hz.

A large vacuum fluorescent display indicates both source and amplifier modes. These modes are selected using the front panel keyboard. In the Source or DC mode, the current selected is displayed.

The model 2701A is rack-mountable in a standard 483 mm (19 in) case. The outputs for the 2701A are located on the rear of the instrument. There are two separate outputs provided for AC, five-way binding posts up to 20 Amps and quick-disconnect high current female terminals from 20 to 100 Amps.

Applications for the 2701A include measurement systems such as model 6010-100 A Resistance Measurement System and model 2100A and 2100B Power Calibrations Systems. Other applications include the high current CCC being developed in many of the national laboratories and the calibration of current transformers.

Specifications
AC Operation DC Operation
Ranges 0 to 100 Amps @ 25 Siemens
0 to 20 Amps @ 4 Siemens
0 to 5 Amps @ 1 Siemens		 Ranges 0 to ± 5 Amps
5 to ± 20 Amps
20 to ± 100 Amps
Uncertainty Hz
5 A
20 A
100 A
50/60 Hz
± 0.2 %
± 0.2 %
± 0.5 %		 400 Hz
± 0.5 %
± 1 %
± 1 %		 1 kHz
± 1 %
± 2 %
± 3 %

5 A
20 A
100 A		 ± 0.5 %
± 0.5 %
± 0.5 %
Ratio of Input Voltage
to Output Current		 All ranges 5 Volts for
full-scale output		 Resolution 16-bit
Voltage Compliance 5 A, 20 A range = 5 V RMS
100 A range = 4 V RMS		 Voltage Compliance 5 A, 20 A range = ± 5 V
100 A range = ± 4 V
Output Stability ± 100 ppm for 8 hours Output Stability ± 100 ppm + 1-bit for
8 hours
DC Offset < 5 mA DC Offset < 5 mA
Harmonic Distortion < 0.1 % of the fundamental at
100 A RMS		 Noise < 1.5 mA + 0.04 % output
Bandwidth DC to 1 kHz DC
Input Terminals 5-way binding posts
Output Terminals Quick disconnect
Output Terminals 18 to 34 °C, 10 to 80 % RH
Warranty 1 Year Parts & Labour

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