Using An Ac Reference (Digital Attenuator); Figure 4-5. 4 To 20 Ma Current Output (Grounded Load); Figure 4-6. Dac-02 Equivalent Circuit When Using An Ac Reference - Keithley DAC-02 User Manual

Using an AC Reference (Digital Attenuator)

In addition to its uses as a standard DC output DAC, the DAC-02 can be
used with a bipolar or AC reference signal. Figure 4-6 shows the
equivalent circuit for the board when used in this mode.
V
R
REF
2R
S1
Data Latches and Switch Drivers

Figure 4-6. DAC-02 Equivalent Circuit when Using an AC Reference

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DAC-02
4 to 20 mA
LL GND

Figure 4-5. 4 to 20 mA Current Output (Grounded Load)

R R
2R 2R 2R
S2 S3 S12
−
Floating
+ Supply
R
L
2R 2R
−
2R
R
+
R
−
+
Bipolar
Output
Unipolar
Output
4-5