Block Diagram; Testpoint Locations; Fault Isolation Techniques; Wear Tolerance - Fluke 189II/AN Service Manual

189II/AN
Service Manual

Block Diagram

A block diagram of the 189II/AN is shown in Figure 1.
Volts P1
Com P2
mA/uA P3
Amps P4

Testpoint Locations

Not available for this Meter.

Fault Isolation Techniques

Not available for this Meter. If the Meter needs service, refer to the "Contacting Fluke"
section.

Wear Tolerance

Not applicable for this Meter.

Trouble Symptoms

Not available for this Meter.

Logic

Not available for this Meter.

Restoration Actions

Refer to the "Performance Tests" section.
12
RMS– DC
Converter
Input
Overload
Protection
Switches
Signal
Division
(R-nets)
RSOB
(Rotary
Switch on
Board)
Figure 1. Fluke 189II/AN Block Diagram
DC Filter
Precision
for AC
ADC
Path
Signal
Conditioning
Measurement uP
12 bit ADC
Timers
FADC
Amp/Filter
SPI
SPI
Control uP
Flash Mgmt
Other
LCD
Buttons
Beeper
Backlight
On/Off
Button,
Rotary
Switch,
Jack
Detect
Flash
and
PSRAM
Memory
Power
Supply
24
Vbatt
5.0
3.0
LCD
2.5
Bias
1.8
VSS
fet36.eps