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Getting Started
To Electrically Tune the Tunable Source's Frequency
Step 2 - Connect the tuning voltage
Figure 2-54
Tuning Voltage Connection
A ± 5 volt tuning voltage can be used. Connect it to the front-panel
VOLTAGE
connector.
CONTROL
Tuning with a Sensitivity of 0.05 ppm/V
With a tuning sensitivity of 0.05 ppm/V the reference chain's 10 MHz
oscillator is tuned. The 600 MHz oscillator is phase-locked to the 100 MHz
oscillator which is phase-locked to the 10 MHz oscillator. In this
configuration a 1 Volt tuning voltage will cause a 0.05 ppm change in the
tunable source's output fequency.
Tuning with a Sensitivity of 1.0 ppm/V
With a tuning sensitivity of 1.0 ppm/V the reference chain's 100 MHz
oscillator is tuned and the 600 MHz oscillator is phase-locked to it. A 1 Volt
tuning voltage will cause a 1 ppm change in the source's output fequency.
Tuning with a Sensitivity of 20 ppm/V
With a 20 ppm/V tuning sensitivity the reference chain's 600 MHz oscillator
is free running. A 1 Volt tuning voltage with cause a 20 ppm change in the
source's output fequency.
2-50 HP 70427A/HP 70428A User's Guide
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