Analyzer Voltage Problems

This section covers issues related to the mobility analyzer's central electrode voltage.

Analyzer Voltage Too High

Symptom: A section of the mobility analyzer's central electrode has an abnormally high voltage.

Cause: On older instruments, the output voltage of the central electrode voltage sources can drift over time.

Solution: If the voltage exceeds 15% of its nominal value, the voltage source requires adjustment. The part must be sent to Airel for service.

Analyzer Voltage Too Low

Symptom: A section of the mobility analyzer's central electrode has an abnormally low voltage.

Initial Observation: Central electrode voltages typically require 5 to 30 minutes to stabilize after powering on the instrument. During this warm-up period, it is normal for the software to report low voltage warnings.

If the voltages fail to reach their nominal values after the warm-up period, you must determine if the fault lies with the voltage source or a short circuit in the analyzer.

Diagnostic Steps

1. Power off the instrument.
2. Disconnect the voltage cable from the bottom of the analyzer.
3. Power on the instrument, run a measurement, and wait for the voltages to stabilize.

Interpreting Results

• If the low voltage issue persists: The problem is with the voltage source or the data acquisition system. Contact Airel Support for assistance, as the voltage source may need repair or replacement.
• If the low voltage issue disappears: The problem is within the analyzer itself.
  • Clean the analyzer, paying special attention to the central electrode and the gaps between electrodes.
  • Measure the electrical resistance between the different sections of the central electrode, and between each section and ground, to identify any short circuits. Ensure all voltage sources are disconnected before performing this measurement.