Model 8642A/B
Operation
Special Functions (cont'd)
DETAILED DESCRIPTIONS OF ALL SPECIAL FUNCTIONS (cont'd)
214.
Positive $M Polarity. This special function disables Special Function 114 and re-enables the
normally selected phase relationships: A positive voltage applied to the external FM/^M INPUT causes a
phase lead and a negative voltage applied causes a phase lag.
215.
Positive FM Polarity. This special function disables Special Function 115 and re-enables the
normally selected frequency-shift relationships: A positive voltage applied to the external FM/^M
INPUT causes a positive frequency shift and a negative voltage applied causes a negative frequency shift.
216.
DC FM Correction On. This special function re-enables the correction disabled by Special Function
116.
217.
DC FM Update Mode Off. This special function disables the DC FM update that occurs with
Special Function 1 17.
218.
AC-Coupled DC FM Off. This special function re-selects the dc coupling to the FM circuitry
disabled with Special Function 11 8.
219.
Re-enable Settling. This special function re-enables the settling disabled with Special Function
119.
221.
Sweep Up and Down Off. This special function re-enables the normal sweep disabled with Special
Function 121. Special Function 221 sets the Signal Generator to repeatedly sweep from the start
end-point to the stop end-point (during auto or single sweep modes).
222.
Logarithmic Amplitude Sweep. This special function selects the normally selected logarithmic
stepped output disabled with Special Function 122.
223.
Phase Continuous Frequency Sweep Off. This special function turns off the Phase Continuous
Frequency Sweep selected with Special Function 123. Refer to RF Frequency Sweep, page 3-49.
234.
Turn On LCD Lighting. This special function turns on the LCD lighting disabled with Special
Function
1
34.
235.
Re-enable Display. This special function re-enables the display of settings disabled with Special
Function
1
35.
240.
Decrement Frequency by 0.1 Hz.
241.
Increment Frequency by 0.1 Hz.
These special functions change the RF signal's output frequency in 0.1 Hz steps each time the special
function is selected. Changing frequency in these ways cause a message to be queued up in the message
list that provides the total increment or decrement. Refer to RF Frequency, page 3-42.
242.
Phase Decrement 1 Degree
243.
Phase Increment 1 Degree
244.
Phase Decrement 5 Degrees
245.
Phase Increment 5 Degrees
These functions change the RF signal's output phase by the indicated amount each time the special
function is selected. For example, selecting SPCL ( P5H1FT I [ - 1 ) f~2~l GD CS decrements output
phase by 5 degrees.
3-175
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