LeCroy_9354A-M-L-TM_Service_Manual_Complete 电路图.pdf

RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Section 6 Internal Calibration and Diagnostics Page 6-1 SECTION 6 INTERNAL CALIBRATION and DIAGNOSTICS 6.1 Introduction ? The 9354A/T internal calibration use routines to confirm basic functionality, no test equipment is required to do these test procedures. The diagnostics menu is entered by simultaneously depressing the third and fourth menu push buttons on the right hand side of the CRT and then by depressing the fifth. ? To quickly check the performance of the digital storage oscilloscope, select the calibration diagnostics. ? Press the recalibrate completely button to do a full recalibration of the front end. It is advisable to perform this type of check when the scope is in a stable condition. Section 6 Internal Calibration and Diagnostics Page 6-2 6.2 Diagnostic Summary ? Press diagnostic summary. ? This is a handy tool to perform a quick but comprehensive internal performance check, without touching the acquisition settings. The failures are indicated by channel identifiers. ? If no problem is detected, the fields are left blank. ? The gain and offset calibration results displayed for Channel 1, Channel 2, Channel 3 and Channel 4 are independent of the following conditions: ? Time base ? 50 or 1 M input impedance ? BWL on or off ? Variable gain ? Offset ? Trigger mode and coupling ? The internal calibration is checked at DC 1 M , and for the six gain settings : 2 mV, 5 mV, 10 mV, 20 mV, 50 mV, .1 V/div.