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Synchronization
outputs
Note
Phase Calibration
Input
A squarewave with the frequency and phase of the
main signal output is available at the front and rear
panel Sync (synchronized) Out connectors. The Sync
transition occurs at the signal zero-crossing or when the
signal crosses the DC offset voltage. The connectors
function for frequencies between 1 mHz and 21 MHz
as a phase-synchronous sinewave. When the auxiliary
TTL clock waveform is chosen, the main signal output is
switched off, and the synchronized outputs function as
TTL clocks for frequencies from 1 mHz to 60 MHz.
The output impedance of either front- or rear-panel sync
output is approximately 5OQ. When connected to a 500
coaxial cable that is terminated by a 500 resistive load,
the sync signal levels are:
Low level < $0.2 V
High Level > + 1.2 V
If a sync output is connected to a 500 coaxial cable that
is terminated by a high impedance load (2 1 Ma) the
voltage levels are approximately twice the values given
above. However, the improper termination of the 5Ofl
system will cause ringing of the positive and negative
transitions of the sync signal.
This input must be connected to the Phase Cal Output
of another HP 3324A. One of the instruments must
have option 003 installed and the other option 004. The
two instruments can then be phase calibrated. Use the
standard cable (supplied) to connect the Phase Cal
Input of option 003 (slave) to the Phase Cal Output of
option 004 (master).
Instrument Operation 3-5
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