2701A Transconductance Amplifier

  • AC: 0 to 100 A
  • DC: 0 to ± 100 A
  • Voltage compliance: ± 5 Volts
  • IEEE-488 Interface
  • Resistive, capacitive, inductive loads
Features

The 2701A was originally developed for the 2100 series of Power Calibration Systems, 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 2701A converts an applied voltage signal into a high-resolution output current, whose value is directly proportional to the input signal level. It has three ranges of 5, 20, and 100 A.

In the DC, or Source Mode, select the source voltage 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 of 100A or more, over a 1000 Hz DC frequency range.

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. Its outputs are located on the rear of the instrument–two separate outputs for AC, five-way binding posts up to 20 A, and quick-disconnect, high-current female terminals from 20 to 100 A.

The 2701A’s applications include measurement systems, such as model 6010-100 A Resistance Measurement System, and models 2100A and 2100B Power Calibration Systems. Other applications include the high-current CCCs being developed in many NPLs, and current transformer calibration.

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 V 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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