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After Low and High Voltage sources components assembly it is necessary to check relevant source
proper operability.
4.1. Select multi-meter DC 200 V measuring range.
4.2. Identify the test ground (GND), 5V and HV test points as shown below.
4.3. Plug in the power supply, and then test HV source operability using a multi-meter in DC voltmeter
mode. Touch the black probe on the GND test point and the red probe on the HV test point. The
voltage should measure between 140 and 180 Volts. When PCB is powered its HV source contacts
shall be not touched by hands or non-isolated tools (non-isolated tweezers for example). If not,
disconnect power and remember that the HV source output could still hold charge at 165-175 V.
Check all relevant joints quality and polarity.
Do not continue with the next test until the error in HV source exists.
NOTES:
Turn the potentiometer to adjust the voltage to approximately 165V. A potentiometer is
needed to change the brightness of the nixie tube.
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4. Low and High Voltage sources operability test
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