Option UK4 Microphone Adapter and Power Supply
The optional Microphone Adapter and Power Supply provides four LEMO connectors
with power for microphones. The input signal from each LEMO connector is routed
to a BNC connector. BNC cables then connect the input signals to the analyzer’s input
channels.
+5 V Regulator Regulates +8 V to +5 V.
DC-to-DC Converter Converts +5 V to +28 V. The second DC-to-DC Converter converts +28 V to +200 V.
Filter Filters +28 V providing the microphone preamplifier voltage to pins 5 and 6 of each LEMO
connector.
On Off Connects a 200 V polarization voltage or ground to pin 3 of each LEMO connector.
Heater Input Power Allows an externally supplied heater voltage to be connected to pin 1 of each LEMO
connector.
LED Drivers Provides control lines for the overload and measurement LEDs on the HP 35230A Sound
Intensity Probe.
Buffer Buffers the trigger signal from the HP 35230A Sound Intensity Probe. A BNC cable connects
the trigger signal to the analyzer’s rear panel.
Sound Intensity Probe
Connector
Provides the interface to the HP 35230A Sound Intensity Probe.
Circuit Descriptions Agilent 35670A
Option UK4 Microphone Adapter and Power Supply
8-40
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