Fluke 8842a instruction manual Maintenance

8842A

Instruction Manual

	5-15.	OHMS CURRENT SOURCE	5-12
	5-16.	OHMS PROTECTION	5-13
	5-17.	OHMS FUNCTIONS	5-13
	5-18.	2-Wire Ohms	5-13
	5-19.	4-Wire Ohms	5-15
	5-20.	A/D CONVERTER	5-15
	5-21.	Timing/Data Control	5-17
	5-22.	Precision DAC	5-18
	5-23.	A/D Amplifier	5-18
	5-24.	Bootstrap Supplies	5-18
	5-25.	DISPLAY	5-19
	5-26.	KEYBOARD	5-19
	5-27.	DIGITAL CONTROLLER	5-19
	5-28.	In-Guard Microcomputer	5-21
	5-29.	Function and Range Control	5-23
	5-30.	A/D Control and Computation	5-23
	5-31.	Calibration Correction	5-23
	5-32.	Keyboard/Display Control	5-24
	5-33.	Troubleshooting Modes	5-24
	5-34.	Guard-Crossing Communication	5-24
	5-35.	GUARD CROSSING	5-24
	5-36.	POWER SUPPLY	5-25
	5-37.	IEEE-488 INTERFACE (OPTION -05)	5-26
	5-38.	Out-Guard Microcomputer	5-26
	5-39.	Guard Crossing	5-26
	5-40.	Bus Interface Circuitry	5-26
	5-41.	Signal Conditioning	5-27
	5-42.	IEEE-488 Interface Power Supply	5-27
	5-43.	TRUE RMS AC (OPTION -09)	5-27
	5-44.	VAC Scaling	5-27
	5-45.	mA AC Scaling	5-28
	5-46.	Frequency Response Trimming	5-28
	5-47.	True RMS AC-to-DC Conversion	5-28
6	Maintenance		6-1
	6-1.	INTRODUCTION	6-3
	6-2.	PERFORMANCE TEST	6-4
	6-3.	Diagnostic Self-Tests	6-4
	6-4.	DC Voltage Test	6-5
	6-5.	AC Voltage Test (Option -09 Only)	6-7
	6-6.	Resistance Test	6-8
	6-7.	DC Current Test	6-9
	6-8.	AC Current Test (Option -09 Only)	6-10
	6-9.	CALIBRATION	6-10
	6-10.	Basic Calibration Procedure	6-11
	6-11.	INITIAL PROCEDURE	6-11
	6-12.	A/D CALIBRATION	6-12
	6-13.	OFFSET AND GAIN CALIBRATION	6-14
	6-14.	HIGH-FREQUENCY AC CALIBRATION	6-15
	6-15.	Advanced Features and Special Considerations	6-16
	6-16.	STORING VARIABLE INPUTS	6-16
	6-17.	CALIBRATING INDIVIDUAL RANGES	6-17
	6-18.	VERIFYING CALIBRATION	6-17
	6-19.	ERASING CALIBRATION MEMORY	6-18

iv