8662A Option H25
08862-92039
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Option H25 to the 8662A Synthesized Signal Generator provides direct control of the
frequencies output from the phase lock loops via a rear-panel mounted, 25-pin, parallel input port.
This is referred to as the Direct Frequency Access (DFA) port. The 8662A will respond to a
specialized 17-bit parallel data format resulting in frequencies in the 30.0 to 100.5 MHz range
when in the DFA mode.
SECTION II. INSTALLATION
On page 2-3, add the following at the end of the Section 2-8, Mating Connectors.
Direct Frequency Access Connector. Interconnection data for the parallel input port is
provided in Figure 2-4 on page 9 of this Insert.
At the top of page 2-6, insert Figure 2-4, found on page 9 of this Insert.
SECTION III. OPERATION
On page 3-1, add the following at the end of Section 3-4, Remote Operation:
DIRECT FREQUENCY ACCESS (DFA). Option H25 provides remote control of the
frequency output from the phase lock loops. This control results in an RF frequency output
in the 30.0 to 100.5 MHz range. Operation of the 8662A Option H25 in the DFA mode is
described in the Direct Frequency Access paragraph on page 3-49. DFA mode allows rapid
frequency switching, sometimes referred to as frequency-hopping.
On page 3-17, replace part of Figure 3-7, Rear Panel Features, with the partial Figure 3-7,
Rear Panel Features (Option H25), on page 10 of this Insert.
On page 3-49, add sections 3-54, 3-55 and 3-56 and Tables 3-11 and 3-12 at the bottom of
the page:
3-54. REMOTE OPERATION, DIRECT FREQUENCY ACCESS
3-55.
DFA MODE
Option H25 gives the 8662A the capability to switch rapidly between frequencies
predetermined by the user utilizing a specialized 17-bit parallel-format input to the
rear-panel DFA connector. Tables 3-11 and 3-12 describe the parallel format used. This
DFA format operates correctly only over the RF frequency range of 30.0 to 100.5 MHz.
The minimum frequency increment for DFA mode is 5 kHz.
Copyright 1986 - HEWLETT-PACKARD COMPANY - Spokane Division
24001 E. Mission Ave, Liberty Lake, WA 99019-9599 U.S.A.
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