Agilent Technologies HP 8642A/B Specifiche Pagina 295

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K Switches
Switches K8 and K9 switch together, and switches Kll and K14 switch
together. Thus, if "8" is keyed into the K switch field, "8" and "9" will
both appear in the field after sending the command and both switches
will be placed in the state opposite to that shown in the Block Diagram
(that is, the Low-Noise Amplifier will be switched in). Furthermore, to
remove switch 8 from the field, both "8" and "9" must be removed.
L Switches
The L switches control a variety of functions. At preset, all L switches
(except L3, which is a rotary switch) are set to the "0" state. Entering an L
switch number and pressing the Send Command softkey causes that L switch
to change to its "1" state. For example, the A7 10 MHz Modulated VCXO B
Assembly, located at the right center of the Block Diagram is controlled by
L15.
(Note the parenthetical comment near the oscillator symbol "L15 =
1,
OSC ON".) When the HP 11848A is preset, L15 = 0 and the oscillator
is off. If "15" is entered into the L switch field and the command is sent,
the state of L15 will be set to "\"; "15" will remain in the displayed L
switch field, and the oscillator will be turned on.
Sending Commands
Press the
Send Command
softkey to initiate a change within the HP 11848A.
Several changes can be set up and then the command sent to change them
all at the same time. Unacceptable value entries are indicated as soon as
the cursor changes fields, or when the Send Command is initiated.
The Clear Functions
The Clear Overld and Clear Outoflk softkeys clear the Overload and Out-
of-Lock Flip-Flops as indicated by the respective front-panel annunciators
(assuming, of course, that the overloading or lock-breaking condition has
been removed).
5-40 11848A Control
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