Electrical Test Instruments PI-2500-G2 and PI-5000-G2
==============================================================================
==============================================================================
Copyright (C) 1994-2021 Electrical Test Instruments, LLC. All Rights Reserved
Page I-5
amperes. The configuration switch on the PI2500 must be set to 4000 or 2000
for proper output readings.
.MONITOR AND CONTROLLER MAC-21
The MAC-21 microprocessor-based measurement and control unit features
digital readout of current and time enhanced by digital signal processing.
Pulse (memory) mode provides fast and accurate automatic evaluation of out-
put current pulses as short as one-half cycle.
The MAC-21 incorporates a precision A/D converter and special firmware for
true-RMS continuous and pulse current reading with much greater accuracy.
It also utilizes a sophisticated current sensing system for more reliable current
latch mode operation and better timing accuracy. An LED digital readout for
current in four ranges from 1000 A to 100 KA reduces the chance of operator
error.
An integral auto ranging timer with LED readout provides four digits in sec-
onds or cycles mode, with a resolution of 0.001 second or 0.5 cycle. A preset
function allows you to set a maximum ON time in seconds or cycles, for con-
venient "jogging" of output to desired current or setting time for heat runs and
long-time tests.
A current hold feature is also built in. When the desired current is displayed, a
simple touch of the MAINTAIN key activates the function, which automatically
adjusts the motorized Vernier to hold the current within 5 amperes.
The memory current displayed after a test indicates the true RMS value of the
entire pulse, no matter how long or short it was, except for instantaneous trip,
where the peak RMS value is used. After a test, it is possible to read the peak
RMS value, which indicates the amount of DC offset or distortion, or the last
displayed average RMS reading, which is useful for pickup testing.
The entire metering and control package are designed to be removed and re-
placed very easily, so that it may be transported separately.
