Worked example
No result for these values. The message above the form says which field to change.
Loop voltage headroom
8.1 V
- Supply required at the design current
- 15.9 V
- Drop across the entered series resistance
- 5.4 V
- Total entered series resistance
- 270 Ω
- Maximum total resistance before zero headroom
- 675 Ω
The entered DC budget has headroom; verify every device drop, maximum component voltage and the required design margin.
Underlined figures are rounded. Select one to copy its full value.
Method and assumptions
Formula
headroom = supply − transmitter minimum − I × total series resistance − fixed dropsUse the complete outbound-and-return cable resistance and the transmitter minimum terminal voltage from its current datasheet.
Limits of this result
- Use the transmitter-specific minimum terminal voltage over its operating range and fault behavior.
- Barriers, isolators, indicators, surge protection and input resistors must all be included in the entered loop.
- This DC budget does not assess intrinsic-safety entity parameters, grounding, EMC or hazardous-area compliance.
Technical sources
Put the value to work
Read the related engineering guidance, or carry this task into System Builder to identify the signal path and EpiSensor products.