Fluke ScopeMeter 123 - Page 4

123
Service Manual
3.3 Detailed Circuit Descriptions...................................................................... 3-9
3.3.1 Power Circuit....................................................................................... 3-9
3.3.2 Channel A - Channel B Measurement Circuits ................................... 3-15
3.3.3 Trigger Circuit ..................................................................................... 3-20
3.3.4 Digital Circuit ...................................................................................... 3-25
4 Performance Verification ................................................................... 4-1
4.1 Introduction................................................................................................. 4-3
4.2 Equipment Required For Verification ........................................................ 4-3
4.3 How To Verify ............................................................................................ 4-3
4.4 Display and Backlight Test ......................................................................... 4-4
4.5 Input A and Input B Tests ........................................................................... 4-5
4.5.1 Input A and B Base Line Jump Test.................................................... 4-6
4.5.2 Input A Trigger Sensitivity Test .......................................................... 4-7
4.5.3 Input A Frequency Response Upper Transition Point Test................. 4-8
4.5.4 Input A Frequency Measurement Accuracy Test ................................ 4-8
4.5.5 Input B Frequency Measurement Accuracy Test ................................ 4-9
4.5.6 Input B Frequency Response Upper Transition Point Test ................. 4-10
4.5.7 Input B Trigger Sensitivity Test .......................................................... 4-10
4.5.8 Input A and B Trigger Level and Trigger Slope Test.......................... 4-11
4.5.9 Input A and B DC Voltage Accuracy Test .......................................... 4-14
4.5.10 Input A and B AC Voltage Accuracy Test ........................................ 4-15
4.5.11 Input A and B AC Input Coupling Test............................................. 4-16
4.5.12 Input A and B Volts Peak Measurements Test.................................. 4-17
4.5.13 Input A and B Phase Measurements Test .......................................... 4-18
4.5.14 Input A and B High Voltage AC/DC Accuracy Test......................... 4-19
4.5.15 Resistance Measurements Test.......................................................... 4-20
4.5.16 Continuity Function Test ................................................................... 4-21
4.5.17 Diode Test Function Test .................................................................. 4-22
4.5.18 Capacitance Measurements Test ....................................................... 4-22
4.5.19 Video Trigger Test............................................................................. 4-23
5 Calibration Adjustment ...................................................................... 5-1
5.1 General ........................................................................................................ 5-3
5.1.1 Introduction.......................................................................................... 5-3
5.1.2 Calibration number and date................................................................ 5-3
5.1.3 General Instructions............................................................................. 5-3
5.2 Equipment Required For Calibration.......................................................... 5-4
5.3 Starting Calibration Adjustment ................................................................. 5-4
5.4 Contrast Calibration Adjustment ................................................................ 5-6
5.5 Warming Up & Pre-Calibration.................................................................. 5-7
5.6 Final Calibration ......................................................................................... 5-7
5.6.1 HF Gain Input A&B ............................................................................ 5-7
5.6.2 Delta T Gain, Trigger Delay Time & Pulse Adjust Input A................ 5-9
5.6.3 Pulse Adjust Input A (firmware V01.00 only) .................................... 5-10
5.6.4 Pulse Adjust Input B............................................................................ 5-11
5.6.5 Gain DMM (Gain Volt)....................................................................... 5-11
5.6.6 Volt Zero.............................................................................................. 5-13
5.6.7 Zero Ohm (firmware V01.00 only)...................................................... 5-13
5.6.8 Gain Ohm............................................................................................. 5-14
5.6.9 Capacitance Gain Low and High......................................................... 5-15
5.6.10 Capacitance Clamp & Zero................................................................ 5-15
5.6.11 Capacitance Gain............................................................................... 5-16
5.7 Save Calibration Data and Exit................................................................... 5-16