867B,863
Service Manual
2-18
mA/µA
2-32.
Milliamp and microamp measurements are connected at the
and
â
inputs.
For the 300 mA and 30 mA ranges, input current flows through L9, F2, K1-4, K1-5, K1-
6, R42, and R109 to
â
. The voltage developed across R42 and R109 is sensed
through R151 by U16.
For 3000
µ
A and 300
µ
A ranges, input current flows through L9, F2, R49, R42, and
R109 to
â
. The voltage developed across R49, R42, and R109 is sensed through
R151 and R148 by U16.
For DC current (mA and
µ
A), voltage is sensed through R82 to U30-9. U30 routes this
voltage to the active filter and the Slow A/D Converter.
For AC current (mA and
µ
A), the voltage is sensed though another switch of U16 and
routed to the AC path.
Amps
2-33.
Amps measurements are connected at the
á
and
â
inputs. The current flows through
F1 and R109 to
â
. The voltage is sensed first though R42, then as described above
for mA/
µ
A measurements.
Table 2-9. Amps Measurement Paths
Range
Shunt
Slow A/D Converter Range
300
µ
A
R49, R42, R109
30 mV
3000
µ
A
R49, R42, R109
300 mV
30 mA
R42, R109
30 mV
300 mA
R42, R109
300 mV
3A
R109
30 mV
10A
R109
300 mV
Summary of Contents for 863
Page 49: ...Maintenance Disassembly 3 3 5 OFF 1 6 Places 4 5 5 3 3 2 os5f eps Figure 3 1 Disassembly ...
Page 50: ...867B 863 Service Manual 3 6 os6f eps Figure 3 1 Disassembly cont ...
Page 52: ...867B 863 Service Manual 3 8 5 1 6 2 3 4 os30f eps Figure 3 2 Reassembly ...
Page 96: ...6 1 Chapter 6 Schematic Diagrams Title Page 6 1 A1 Main PCA Assembly 6 3 ...
Page 98: ...867B 863 Service Manual 6 4 FLUKE 867 1001 Sheet 2 of 5 Figure 6 1 A1 Main PCA cont ...
Page 99: ...Schematic Diagrams 6 6 5 FLUKE 867 1001 Sheet 3 of 5 Figure 6 1 A1 Main PCA cont ...
Page 100: ...867B 863 Service Manual 6 6 FLUKE 867 1001 Sheet 4 of 5 Figure 6 1 A1 Main PCA cont ...
Page 101: ...Schematic Diagrams 6 6 7 FLUKE 867 1001 Sheet 5 of 5 Figure 6 1 A1 Main PCA cont ...
