Electrical Test Instruments PI-6000
Section II - Detailed Description
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Copyright(C) 1994-2019 Electrical Test Instruments, LLC All Rights Reserved
Page II-5
Later test sets were improved by the use of air core current sensors, and various
electronic instruments to measure current and time. These devices include the
Duffers current meter, which was essentially peak responding, and the
improved Accu-Amp, which used analog true-RMS circuitry and sample/hold
technology. Similar circuitry was incorporated in the Multi-Amp Mem-Amp.
A major change in transformer design, incorporating multiple primary cores
and dual secondary busses, provided greater efficiency and lower overall weight
and size, but required a single input voltage.
The PLC-2000 used in the EIL PS-250 and PS-600 used a microprocessor to
provide some advanced functions such as auto jog and current hold, as well as
data collection and printout, but it was hard to use. Moreover, its current
measurement circuitry was essentially analog, and did not provide accurate
true RMS readings.
The Phenix Technologies’ HC
-30 and HC-100 used a PC compatible computer
and real time data analysis software to provide some improvement, but it was
also hard to use and suffered from reliability problems due to its complexity.
The MAC-21 Monitor Ammeter Controller used in the PI-6000 has been used
with great success in many retrofits of older test sets. It has been refined to be
highly accurate, reliable, and easy to use. The overall design of the test set
incorporates advanced features which allow use on several input voltages and
allows for very fast adjustment of output current. Other important advantages
are simple current hold operation, and multi-mode memory current display.
The PI-6000 has been improved with a high efficiency C-core transformer that
produces much higher output current at lower input current, due to low
impedance.
TRADEMARKS
1. "Duffers" refers to a device manufactured by Duffers Corporation
2. "Accu-Amp" is a trademark for a device originally made by EIL Instruments,
Inc.
3. "SmartCore" is a trademark of ZWorld Engineering, Davis, CA.
