1.2
Terminology
The acronyms, terms, and definitions used throughout this manual are described below:
1.2.1
Acronyms
AC
Alternating
Current
AVTS
Advanced Visual Test Software
CW
Clockwise
(rotation)
CCW
Counter Clockwise (rotation)
DC
Direct
Current
GPIB
General Purpose Interface Bus (IEEE-488)
GPS
Global Position System
GUI
Graphical User Interface
Hz
Hertz
ID
Identification
I/O
Input/Output
kHz
Kilo
Hertz
LCD
Liquid
Crystal
Display
LED
Light Emitting Diode
MAG
Magnitude
MHz
Megahertz
MTA
Maximum Torque Angle
NVRAM
Non-volatile Random Access Memory
PC
Personal
Computer
ROM
Read-Only
Memory
RS-232
Serial Communication Interface
RTS
Relay Test System
SRAM
Static Random Access Memory
SSD
Solid State Disk
TCM
Timer Control Module
TVI
Touch View Interface
USB
Universal Serial Bus
VAC
Volts Alternating Current
VDC
Volts Direct Current
V/I Gen
Voltage / Current Generator Module
VRMS
Volts Root Mean Square
UUT
Unit Under Test
1.2.2
Glossary of Terms
The MPRT TVI display screens prompt the user to select, or set, various values. The values vary
depending on the relay under test, and the relay setting screen. Many of the terms used are
similar in nature and mean virtually the same thing regardless of the type of relay. For example,
the term Time Dial is the used to define the time dial setting on the relay under test. The Time
Dial could be on an overcurrent relay, or just as easily be on a under voltage relay.
Unfortunately, some of the terms described here may apply to different types of relays in different
ways, and thus may not cover every possible relay made. However, it is hoped that this glossary
will help the user to understand every setting value on every relay setting screen.
1.2.2.1 Tap
A numerical value associated with a tap setting on the relay. Tap is normally associated with a
value of current, voltage, frequency or watts. Tap is used to define a setting value, pick up value,
or minimum operating point, of the relay under test.
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