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Chapter 3 -- Instrument Circuitry--Reference 3000 Schematic/Block Diagrams
Power input voltages less than 20 volts or greater than 26 volts can damage the
Reference 3000's power supply.
Notes for Figure 3-7:
One of eight identical channels is shown
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The input buffers work over the entire Reference 3000 compliance voltage range.
•
•
The maximum useable differential voltage between the two inputs on a channel is ± 5 volts.
Each channel has its own filtering. The Aux A/D Channel filter is not useful for switched inputs.
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The x10 and x100 gains in the Aux A/D channel can be used to improve A/D resolution.
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The inputs have an input impedance of greater than 10
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The inputs will not be damaged by connection to voltages as large as ± 36 volts versus the Reference
•
3000's ground, regardless of the compliance voltage setting. This is true even when the Reference 3000 is
not powered up. They cannot measure voltages larger than the compliance voltage.
CAUTION
Figure 3-7
One AE Channel
11
Ohms as long as the product is powered.
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