Fluke 123 Service Manual

Fluke 123/124/125
Service Manual
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Performance Verification...................................................................................3-1
3.1 Introduction.................................................................................................... 3-3
3.2 Equipment Required For Verification ...........................................................3-3
3.3 How To Verify............................................................................................... 3-4
3.4 Display and Backlight Test............................................................................3-4
3.5 Input A and Input B Tests.............................................................................. 3-5
3.5.1 Input A and B Base Line Jump Test...........................................................3-6
3.5.2 Input A Trigger Sensitivity Test .................................................................3-8
3.5.3 Input A Frequency Response Upper Transition Point Test ........................3-9
3.5.4 Input A Frequency Measurement Accuracy Test .......................................3-9
3.5.5 Input B Frequency Measurement Accuracy Test........................................3-10
3.5.6 Input B Frequency Response Upper Transition Point Test.........................3-11
3.5.7 Input B Trigger Sensitivity Test .................................................................3-12
3.5.8 Input A and B Trigger Level and Trigger Slope Test.................................3-13
3.5.9 Input A and B DC Voltage Accuracy Test .................................................3-16
3.5.10 Input A and B AC Voltage Accuracy Test ...............................................3-18
3.5.11 Input A and B AC Input Coupling Test.................................................... 3-19
3.5.12 Input A and B Volts Peak Measurements Test .........................................3-20
3.5.13 Input A and B Phase Measurements Test .................................................3-21
3.5.14 Harmonics (Fluke 125).............................................................................3-21
3.5.15 Input A and B High Voltage AC/DC Accuracy Test................................ 3-22
3.5.16 Resistance Measurements Test .................................................................3-24
3.5.17 Continuity Function Test ..........................................................................3-25
3.5.18 Diode Test Function Test..........................................................................3-26
3.5.19 Capacitance Measurements Test............................................................... 3-26
3.5.20 Video Trigger Test....................................................................................3-27
Calibration Adjustment......................................................................................4-1
4.1 General...........................................................................................................4-3
4.1.1 Introduction................................................................................................. 4-3
4.1.2 Calibration number and date.......................................................................4-3
4.1.3 General Instructions....................................................................................4-3
4.2 Equipment Required For Calibration.............................................................4-4
4.3 Starting Calibration Adjustment .................................................................... 4-4
4.4 Contrast Calibration Adjustment ................................................................... 4-6
4.5 Warming Up & Pre-Calibration.....................................................................4-7
4.6 Final Calibration ............................................................................................4-7
4.6.1 HF Gain Input A&B ...................................................................................4-7
4.6.2 Delta T Gain, Trigger Delay Time & Pulse Adjust Input A.......................4-9
4.6.3 Pulse Adjust Input B................................................................................... 4-10
4.6.4 Gain DMM (Gain Volt) .............................................................................. 4-10
4.6.5 Volt Zero.....................................................................................................4-12
4.6.6 Zero Ohm....................................................................................................4-12
4.6.7 Gain Ohm....................................................................................................4-13
4.6.8 Capacitance Gain Low and High................................................................4-14
4.6.9 Capacitance Clamp & Zero......................................................................... 4-14
4.6.10 Capacitance Gain ...................................................................................... 4-15
4.7 Save Calibration Data and Exit......................................................................4-15

Fluke 123 Specifications

General

Bandwidth	20 MHz
Sample Rate	25 MS/s
Channels	2
Input Impedance	1 MΩ
Display Size	5.7 inches
Temperature Range	0 °C to 50 °C
Dimensions	232 mm x 115 mm x 50 mm
Display	Digital LCD
Memory Depth	512 points per input
Battery Life	7 hours
Weight	1.2 kg
Safety Category	CAT III 600 V