Test Insturments Flashcards
Piezo
(Pumpkin head)
High Voltage detector, noncontact voltage detector
Meggar
Megohmeter- hi resistance ohmmeter High DC voltage
Spot test
60 seconds,verifies integrity of insulation, most common test. (1 meg per/1000v)
Dielectric absorption test
10 minutes, verifies absorption characteristics of insulation are in good working order
Insulation step voltage test
Creates a electrical stress on internal insulation cracks to reveal aging or damage. Step up voltage
Height meter
Measure height of overhead cable’s to ensure correct height
Hipot
To ensure that there is no chance of electric shock or damage
*tests for leakage current
Contact meter
Voltmeter specifically designed to take measurements on high-voltage cable
Noncontact meter
Piezo
High-voltage amp meter
Test instrument specifically designed to take current measurements on high-voltage
High-voltage phasing tester
Identifies high-voltage phases
High voltage test probe for a DMM
Accessory to increase voltage measurements range above the DMM listed range
Design test
Test on newly design components and equipment to failure
Production test
Test is performed to meet codes and standards to ensure quality control
Acceptance test
Immediately after install but before put into service
Preventative maintenance test
Periodic testing in recording to detect failures
Tachometers
Measure speed of a moving object
Tachometer- Contact
Measures rotational speed/direct contact
Tachometer-laser
Uses laser light to measure speed of object(confined space)
Tachometer-Strobe
Uses flashing light to measure speed
Tachometer-Photo
Uses light beams/ counts reflections per minute to measure speed
Ground bonding test
Test that verifies ground circuit of electrical device is sufficient size to carry fault
Troubleshooting methods-system
Have knowledge of hardware operation software and interfaces in system
Troubleshooting methods – equipment
Testing of individual component
Troubleshooting methods-board
Testing a printed circuit board
Troubleshooting methods – component
Troubleshooting Individual device used on board or module
Troubleshooting methods – chip
Integrated circuit that is packaged in insulating polymer case
Troubleshooting methods – flowchart
Used to properly perform six step troubleshooting
Troubleshooting methods – procedure
Used to perform troubleshooting chart
Six steps of troubleshooting
1-System recognition 2-Symptom elaboration 3-hypothesizing probable faulty functions 4-localizing faulty function 5-localizing faulty circuit 6-failure analysis
