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Model 7620
W IDE -B AND T RANSCONDUCTANCE A MPLIFIER
Highest Performance, Range and Accuracy Available for any Amplifier Today!
Guildline's 7620 Transconductance Amplifier is a very
wide band Transconductance Amplifier. By connecting the
output from a stable voltage source to the 7620, it is capable of
producing outputs up to 20 A over a specified frequency range
of DC to 100 kHz.
The 7620 provides the capability of calibrating any device
requiring a known stable source of current up to 20 A, such as
current shunts and current meters. The Transconductance
Amplifier has been designed to satisfy a growing need for AC
current measurement of power harmonics in power
distribution systems.
The output of the 7620 uses a unique patented multi cell array,
developed at The National Institute of Standards and
Technology (NIST). This output array is extremely stable, with a
zero drift of less than 50 ppm/hour at 20 A at 30 kHz.
7620 FEATURES
The 7620 offers an impressive 10 V output compliance voltage
Stability <10 ppm/hour @ 30 kHz at D.C. and low frequencies, reducing to 5 V at 100 kHz. A front
Ranges, (6) 200 A to 20A panel display indicates the compliance voltage existing at the
output at all times. Three compliance LEDs indicate the
Frequency DC to 1 MHz operating output current and frequency band in use.
Compliance to 10 Volts
The 7620 Allows Calibration of Devices requiring
Guarded Output a Known Stable Source of Current up to 20 A and
IEE$-488 Interface provides an amazing 100 kHz to 20 Amperes and
Over Voltage and Over Current Protection 1 MHz to 8 Amperes!
Input errors have been eliminated by providing the unit with a
four terminal input. This enables the 7620 to be easily
connected to most accurate 4-wire sensing voltage sources.
One of the main sources of error in making current
measurements is the leakage between the HI and LO terminals
of the current source. To alleviate this condition, the 7620 has a
driven output guard which provides a buffered signal whose
potential follows that of the output HI.
The 7620 is fully programmable over the IEEE 488 General
Purpose Interface Bus. The Bus address is selectable from the
rear panel, and all front panel controls can be duplicated over
the Bus with the exception of power on/off.
A sophisticated overload detection system is implemented on
the unit to control and indicate when the 7620 is operating
within its specified limits. It is also possible to operate the unit
outside the specification but within its safe limits by disabling
part of the protection system. In this case, information is still
provided to the front panel and over the Bus as to the status of
the instrument.
7620 Wide-Band Transconductance Amplifier
7620 Series Specifications
Accuracy (24 hrs) @ 23