Monitor And Controller Mac-21; Proposed Enhancements - ETI PI-800 Instruction Manual

Electrical Test Instruments PI-800 and PI-1600
Section I - General Information and Specifications
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The MAC-21 is also capable of reading Peak RMS current, which can help detect
waveform distortion on fast trips, as well as Last RMS current, which is useful for
pickup tests. Either value may be displayed after the test is completed. Nor-
mally, the MAC-21 displays the true RMS value of the entire waveform, regard-
less of duration.
The entire test set has been designed for reliability, ruggedness, reasonable
one-person portability, and ease of use. Sophisticated electronics in the MAC-21
provide state of the art accuracy and convenience, while simple connections al-
low for easy disassembly for transportation or service. In the unlikely case of fail-
ure of the MAC-21, in an emergency, it is possible to operate the test set without
it by using a clamp-on ammeter and a simple adapter for initiation.

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 0.1 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.
The memory current displayed after a test indicates the true RMS value of the
entire pulse, no matter how long or short it was. Additionally, it is possible to
read the peak RMS value, which indicates the amount of DC offset or distor-
tion, or the last displayed average RMS reading, which is useful for pickup test-
ing.

PROPOSED ENHANCEMENTS

The AT-10 Autotransformer unit also allows the test set to be used on 208 VAC
or 480 VAC at full capacity, and also provides a GFCI protected 120 VAC conven-
ience outlet with 4 amperes capacity for lamps, test equipment, and small
power tools.
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