Fluke 189II/AN, Руководство по обслуживанию

Страница: 20 / 48

189II/AN
Service Manual
12
Block Diagram
A block diagram of the 189II/AN is shown in Figure 1.
Switches
SPI
Control uP
Flash Mgmt
Volts
Com
mA/uA
Amps P1
P2
P3
P4
RSOB
(Rotary
Switch on
Board)
Input
Overload
Protection
Signal
Division
(R-nets)
RMS– DC
Converter
DC Filter
for AC
Path
Signal
Conditioning
Precision
ADC
FADC
Amp/Filter
Power
Supply
24
Vbatt
5.0
3.0
2.5
1.8
VSS
LCD
Measurement uP
12 bit ADC
Timers
SPI
Other
Buttons
Beeper
Backlight
Flash
and
PSRAM
Memory
LCD
Bias
On/Off
Button,
Rotary
Switch,
Jack
Detect
fet36.eps
Figure 1. Fluke 189II/AN Block Diagram
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.