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Operator’s Manual Simple AFG Application
Berkeley Nucleonics Corporation
[email protected] | www.berkeleynucleonics.com
2955 Kerner Blvd, San Rafael, CA 94901 | 800-234-7858
Rev 1.1
External Modulation Input Connector
The MODEL 685 series instrument has an input connector to receive an external analog signal that is
used as modulating source. When the selected Run Mode is “Modulation” and the source is “External”
the instrument will use this signal to modulate the carrier waveform.
The connector type is a SMA.
Reference Clock Input Connector
The MODEL 685 series instrument can use an external clock source to generate the sampling clock
frequency. This feature allows to synchronize the generator with an external clock and the frequency
range is 5 MHz to 200 Mhz.
The connector type is a SMA.
Reference Clock Output Connector
This connector outputs the internal 10MHz (100MHz Optional) reference clock used to synthesize the
DAC sampling clock. If the clock source is internal it produces a signal at 10 MHz (100 MHz Optional), if
the source is external it is disabled.
The connector type is a SMA.
Digital Output connector
Important Note
: this connector is not used by AFG and SPG application.
External Clock Input Connector
This connector input gives the User the possibility to feed directly a sampling clock for the System. This
Clock bypasses the internal Generator Clock System of the instrument.
The connector type is a SMA.
Sync Clock Output Connector
This connector outputs a divided clock generated from the sampling clock of the instrument. The
resulting frequency can be selected by the User from a list with all possible values.
The connector type is a SMA.
Sync In / Sync Out Connectors
The purpose of those connectors is to connect and synchronize together multiple instruments. Up to 4
instruments can be synchronized.
Important Note
: this connector is not used by AFG application.
