Fluke 27 Service Manual

2-1
Chapter 2
Theory of Operation
Title Page
2-1. Introduction........................................................................................... 2-3
2-2. Functional Description ......................................................................... 2-3
2-3. Block Diagram Description.................................................................. 2-3
2-4. Input Overload Protection ................................................................ 2-4
2-5. Function Switching Circuits............................................................. 2-4
2-6. Signal Conditioning Circuits............................................................ 2-4
2-7. Custom Analog IC (U1) ................................................................... 2-4
2-8. Peripherals to U1.............................................................................. 2-6
2-9. Microcomputer Control.................................................................... 2-6
2-10. Display.............................................................................................. 2-7

Fluke 27 Specifications

General

Display Type	LCD
AC Voltage Range	0.1 mV to 1000 V
DC Voltage Range	0.1 mV to 1000 V
AC Current Range	0.1 μA to 10 A
DC Current Range	0.1 μA to 10 A
Battery Type	9V
Continuity	Yes
Diode Test	Yes
Safety Rating	CAT III 600V
AC Current Accuracy	±(1.5% + 2 digits)
Resistance Accuracy	±(0.2% + 1 digit)
DC Voltage Accuracy	±(0.1% + 1 digit)