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Remote Sense
Note
Maximum Lead
Resistance
Chapter 4
In remote sense mode, the D/A Converter measures the actual voltage
delivered at the load, then compensates for any difference between the
measured value and the selected value. The equivalent output circuit for the
D/A Converter using remote sense is shown in Figure 4-3.
Remote sense operation is available for voltage output only. During current
output, the SENSE terminals must remain disconnected.
Figure 4-3. Remote Sense Operation
When using the D/A Converter to output voltage using remote sensing
(refer to pages 24–25), the maximum allowable lead resistance is calculated
using the following procedure (refer to Figure 4-3):
1. The driver amplifier's maximum output voltage is less than 19 V
(17 V typical) when the load resistance is infinite.
2. The maximum output current available is 24 mA.
3. The maximum load voltage (V
exceeds approximately 12 V. The maximum load voltage is calculated
as follows:
≤ (24mA)(R
V
L(max)
4. The maximum voltage drop allowed across the resistance of the leads
(V
) is calculated as follows:
drop (max)
= 17 − V
V
drop(max)
5. Therefore the maximum allowable lead resistance (R
V
drop(
≤
R
lead
V
L(max)
) is normally 10.92 V, and never
L(max)
)
load
V
− (101Ω)
(
L
max)
R
)
max
R
load
Understanding the HP E1328A
L(max)
load
) is:
lead
33
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