
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