Model 8642A/B
Operation
Instrument Preset, Partial Preset (cont'd)
PARTIAL
How Partial Preset Affects Instrument Settings
Selecting PARTIAL ( I SHIFT I I INSTR PRESET I ) affects settings as follows:
• Partial Preset does not change the setting of:
RF Frequency
Amplitude Reference
EMF Mode
Sweep Mode (Auto, Manual, or Single selection)
HP-IB Status Byte
HP-IB RQS Mask
• Partial Preset turns off the following functions but maintains their last-selected
values as "on" settings that can be selected with the [ OFF ON I key:
AM Depth
FM Deviation
$M Deviation
Pulse Modulation
Modulation Output Level
Start Frequency
Stop Frequency
Start Amplitude
Stop Amplitude
Frequency Reference
• Partial Preset sets the following functions to the initialized states and values listed
in Table 3-25 on the previous page.
Modulation Frequency
Sweep Time
• Partial Preset also:
Maintains the next Save, Recall register.
Disables Knob Hold and Knob Increment.
Maintains all Increment Set values and Knob cursor positions.
Turns off all special functions with code numbers less than 200.
Clears any uncompleted HP-IB messages.
Selects RF Frequency as the active function.
Selects RF.OFF. (which does not change the output attenuators but maintains the last
selected value as the "on" setting that can be selected with the I OFF ON ) key).
HP-IB
Keys
INSTR PRESET
PARTIAL
Codes
IP
pp
Comments Bypassing the Power-Up Self Check
The Signal Generator takes aproximately 20 seconds to perform the initial checks done
when [ POWER I is switched from STBY to ON. This time delay can be avoided and
these checks can be bypassed by holding down the [ SHIFT "I key during turn on: First
hold down the [ SHIFT I key, then switch I POWER 1 to ON, holding [ SHIFT J until
instrument settings are displayed.
3-139
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