Fluke 8840A - Precision Digital-to-Analog Converter (DAC); A;D Amplifier Circuit

Theory of Operation
AID CONVERTER
SENSE 0303 SENSE PATH FOR
2 WIRE OHMS, nood
RANGE. DURING TRA(
PERIOD.
TO
PERIOD RANGE K401 Q310 0303 K301 0311 U301B U302A U301C U3011
TRACK 200R 2 4 o 0
2 kn 0 2 4 0 0 0
20 kQ 0 2 4 0 0 0
200 kn 0 2 4 0 0 0
2000 kn 0 2 4 0 0
20 MR 0 2 4 0 0
HOLD 2000 0 2 4 2 4
2 kR 0 2 4 0 0 2 4
20 kn 0 2 4 0 0 2 4
200 kR 0 2 4 0 0 2 4
2000 kn 0 2 4 0 0 0
20 MR 2 4 0
0 = Switch closed (or relay energized).
2 = Switch closed only in 2 WIRE ohms.
NOTE:
Filter switch
Q304 is for the
4 = Switch closed only in 4 WIRE ohms.
S reading rate, ranges rl, 12, and I
Figure 5-8. Ohms Scaling
5-10
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