Kleinwaechter CPM 374, Manual

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5 Initial Operation
2. Initial Operation
With its integrated NiMH storage battery the CPM 374 is plug-and-play. After switching on the
software version is displayed briefly.
Please use only the provided power supply. In battery operation mode the backlight is powered
off to save power. Furthermore the device has automatic power shut-off after 10min of inactivi-
ty.
3. Mode Selection
The CPM 374 can be driven as charge plate monitor, voltmeter or electrostatic field meter. By
pressing button
«B» the modes can be switched.
4. Charge Plate Mode
4.1. Decay Time and Offset Voltage
The display shows the selected type of measurement and prompts to start, e.g.:
The last mode is stored in the EEPROM and displayed after turning on.
By selecting Decay Time = AUTO the decay time for the positive and the negative voltage is de-
termined automatically . AUTO is recommended because the Start button has to be pressed only
once to perform a measurement, including the determination of the offset voltage.
The offset voltage is the plate’s potential after a certain time that defines the equilibrium of
positive and negative ions. If the offset voltage is positive, the air ionizer has a excess of positive
ions – in case of negative offset voltage the air ionizer excesses negative ions.
Please consider the manufacturer’s instructions for a qualitative analysis.
After pressing the button «A», the plate electrode is charged by the integrated high voltage unit.
The display shows the timer parameters and the applied voltage, e.g.:
TIMER: 1000-100V
U > 1200V
DECAY TIME: AUTO
PRESS START !