Monroe Electronics Charge Plate - Analyzer - model 300 - Manual (Page 10)

10
A reference voltage representing zero volts on the ion-collecting plate is provided on one pin
of the connector. This reference voltage is in the range of 2.27V and 2.50V.
The analog output is a unipolar signal representing the plate voltage. The fieldmeter (plate
voltage sensor) output signal appears on another pin of the connector, and is in the range of
±1V from the reference voltage, wherein +1V with respect to the reference voltage
represents +1000V on the ion collecting plate, and -1V with respect to the reference voltage
represents -1000V on the ion collecting plate.
A stereo phone plug is provided. The third terminal is a ground connection.
If connecting the analog output of the Model 300 to an oscilloscope, we recommend
connecting the reference voltage output to one input of the oscilloscope and connecting the
signal output to another input of the oscilloscope, and subtracting the reference output from
the signal output using the math feature or add/invert features of the oscilloscope.
Figure 3. Analog Output Connections
Tripod Mounting
Both the bottom of the console and the bottom of the ion collecting plate are equipped with a
threaded insert for tripod mounting. Thus, either the entire instrument or just the ion
collecting plate can be tripod mounted, depending on your requirements.
Ion Collecting Plate Assembly
Ion Collecting Plate
The Model 300 has a 6
 X 6 (15 cm x 15 cm) ion collecting plate assembly (plate assembly)
that can be used in an operational position on the top of the Model 300 console, or it can be
removed and located remotely for testing ionization systems. The plate assembly operational
position atop the console is different from the plate assembly storage position for shipment.
Moving the Plate Assembly from the Storage Position to the Operational Position
As received, the ion collecting plate assembly is stored in the console. (See Figure 4.) The
Model 300 cannot be operated properly when the plate assembly is in this storage position.