9640A
Instruction Manual
3-22
Reference Frequency Output Connector
The Reference Frequency Output Connector is a rear-panel BNC connection that
provides access to an internally generated reference frequency. See Table 3-1 for the
output specifications.
Table 3-1. Reference Frequency Output Specifications
Parameter Specification
Comments
Connector Type
BNC
Out Referenced to Ground
Frequency
1 MHz or 10 MHz
User selectable
Amplitude into 50
Ω
1.5 V pk-pk nom
-0.4 V to 1.1 V nominal
Amplitude into 1 k
Ω
3.0 V pk-pk nom
-0.4 V to 2.6 V TTL or 3 V compatible
Reference Frequency Input Connector
The Reference Frequency Input Connector is a BNC input connection for applying an
external reference frequency. See Table 3-2 for the input specifications.
Table 3-2. Reference Frequency Input Specifications
Parameter Specification
Comments
Connector Type
BNC
Input Referenced to Ground
Nominal Frequency
1 to 20 MHz
In user selectable 1 MHz steps.
Phase Noise specification holds only for
10 MHz or 20 MHz external clocks.
Lock Range
9640A
9640A-LPN
± 30 ppm
± 1 ppm
On-screen lock indicator
Amplitude
1 V pk nominal
± 5 V pk max
Input Impedance
50
Ω
Will accept TTL drive via a series 1 k
Ω
resistor
- not provided
Phase Lock
Bandwidth
1 kHz nominal
Phase Noise of output is determined by the
incoming clock approaching or below this
offset.
Note
External Reference I/O’s are used to lock frequency synthesizers of two or
more instruments (daisy chain). This eliminates offset and drift of frequency
between instruments, allowing, for instance, a Spectrum Analyzer to
accurately tune with respect to the Instrument. If they were not locked, the
Analyzer and Instrument would be likely to drift off tune and the Analyzer
could lose or not see the Instrument signal.
Instruments locked to the same Reference Frequency in this way can still
exhibit very slight frequency offsets due to synthesizer / divider errors, and
the two output frequencies will not be phase locked. (See description under
Modulation Leveling and Frequency Pull Input Connector.)
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