Polarity Duty Cycle

Break down positive/negative ionization duty cycle and switching overhead.

Description

Polarity switching divides an acquisition cycle between positive-mode dwell, negative-mode dwell and overhead.

Polarity switching divides an acquisition cycle between positive-mode dwell, negative-mode dwell and overhead. Overhead reduces the share devoted to signal acquisition.^[1]

Break down positive/negative ionization duty cycle and switching overhead.

When to use Polarity Duty Cycle

Use this tool to break down positive/negative ionization duty cycle and switching overhead.

Prepare the measured profile, formula counts, upstream model outputs or caller-defined reference criteria requested. Keep paired entries aligned and units, sample basis and preprocessing consistent.

How to use Polarity Duty Cycle and understand its results

Prepare the measured profile, formula counts, upstream model outputs or caller-defined reference criteria requested. Keep paired entries aligned and units, sample basis and preprocessing consistent.
Enter positiveDwellMs, negativeDwellMs, switchingOverheadMs using the field table and calculation rules, then run the tool.
Read cycleMs, positiveDutyPercent, negativeDutyPercent, overheadPercent. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
positiveDwellMs	Positive dwell ms	number	Required
negativeDwellMs	Negative dwell ms	number	Required
switchingOverheadMs	Switching overhead ms	number	Required

Enter nonnegative durations on the same time basis with positive total. Include overhead once for the whole cycle. Return total and the three percentage shares.

cycle=positive+negative+overhead; share%=100 duration/cycle

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
cycleMs	Cycle ms	number
positiveDutyPercent	Positive duty percent	number
negativeDutyPercent	Negative duty percent	number
overheadPercent	Overhead percent	number

json

{
  "input": {
    "positiveDwellMs": 50,
    "negativeDwellMs": 30,
    "switchingOverheadMs": 20
  },
  "output": {
    "cycleMs": 100,
    "positiveDutyPercent": 50,
    "negativeDutyPercent": 30,
    "overheadPercent": 20
  }
}

Limitations and assumptions

Instrument switching behavior and required sampling density are not modeled. Include all relevant overhead in the supplied duration.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use DDA Cycle Budget: Calculate top-N DDA scan-cycle time and remaining budget. For a complementary task, use DIA Window Planner: Partition a DIA m/z span into contiguous isolation windows.

References

Polarity Duty Cycle — tool.io

Similar or alternative tools

DDA Cycle Budget
Calculate top-N DDA scan-cycle time and remaining budget.
DIA Window Planner
Partition a DIA m/z span into contiguous isolation windows.