VI
7.15 Frequently asked questions and answers in transformer scan test............................ 110
7.15.1 High & Low Limits .................................................................................. 110
7.15.2 Measurement item loss ............................................................................. 110
7.15.3 Measurement Interruption ........................................................................ 110
7.15.4 Poor DCR Accuracy ................................................................................. 111
7.15.5 Poor Lk Accuracy ..................................................................................... 111
7.15.6 Inaccurate Turn ......................................................................................... 111
7.15.7 Unstable Turn ........................................................................................... 111
7.15.8 Difference between the first and the second Lx ....................................... 111
7.15.9 Poor Stability of Cx and Zx Open Test Data ............................................ 112
7.15.10 DCR and PS Open Cannot Reach Infinite Large ..................................... 112
7.16 User-made Test Fixture ............................................................................................ 112
7.16.1 Use 1831-EXT1 to Make Test Fixture ..................................................... 112
7.16.2 Example of using 1801-EXT11A(5.0)-B pin signal ................................. 114
7.17 Self-check Function of Scanner Relay ..................................................................... 114
7.17.1 Operation steps for scan self-check .......................................................... 114
7.17.2 Displayed Information on Screen ............................................................. 115
7.17.3 Detection Method for Relay Short ........................................................... 116
7.18 RELAYS ACT COUNT ........................................................................................... 116
7.18.1 View Steps of Scan Box for <RELAYS ACT COUNT>.......................... 116
7.18.2 Screen Display Information Description .................................................. 117
Chapter 8 Performance and Test ............................................................................................... 118
8.1 Test Function ............................................................................................................ 118
8.1.1 Parameter and Symbol ............................................................................. 118
8.1.2 Test combination ...................................................................................... 118
8.1.3 Mathematical Operation ........................................................................... 118
8.1.4 Equivalent mode ....................................................................................... 118
8.1.5 Range ....................................................................................................... 118
8.1.6 Trigger ...................................................................................................... 119
8.1.7 Delay time ................................................................................................ 119
8.1.8 Connection modes of test terminals ......................................................... 119
8.1.9 Test speed (Frequency>=10kHz).............................................................. 119
8.1.10 Average .................................................................................................... 119
8.1.11 Display digit ............................................................................................. 119
8.2 Test signal................................................................................................................. 119
8.2.1 Test signal frequency ................................................................................ 119
8.2.2 Signal mode .............................................................................................. 120
8.2.3 Test signal level ........................................................................................ 120
8.2.4 Output impedance .................................................................................... 120
8.2.5 Monitor for test signal level ..................................................................... 120
8.2.6 Maximum measurement display range ..................................................... 120
8.2.7 DC bias voltage source ............................................................................. 121
8.3 Measurement accuracy ............................................................................................. 121
8.3.1 Accuracies of │Z│,│Y│, L, C, R, X, G, B ........................................ 121