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5-67
Hardkey and Softkey Reference
I/Q
I/Q
Pressing the front panel
I/Q
key reveals a menu of softkeys. These softkeys are
described in this section in alphabetical order.
ALC Off On
This softkey toggles the automatic leveling control (ALC) circuit off and on.
The ALC is normally on. The RF output power of the signal generator is
constantly monitored and controlled by the ALC circuit. Its purpose is to hold
output power at its desired level in spite of drift due to temperature and time.
There are some modulation conditions which the ALC circuit cannot handle
properly which lead to output level errors. In these conditions, better power level
accuracy can be obtained by turning the ALC off and using power search. (Refer
to the
Power Search Manual Auto
softkey documented in this section for more
information about power search.) ALC off is useful with pulse modulation with a
pulse width narrower than 2
µ
s and with certain external I/Q modulation.
Pulse modulation is accomplished using a modulator which precedes the ALC
detector. The ALC must, therefore, measure a pulsed signal, and it is able to do
this if the pulse width exceeds 2
µ
s. For narrower pulses, set the
ALC
softkey to
Off
.
Содержание ESG-D Series
Страница 4: ...ii ...
Страница 34: ...Contents 30 ...
Страница 46: ...1 12 Preparing for Use Verifying Signal Generator Operation ...
Страница 138: ...5 2 Hardkey and Softkey Reference ...
Страница 164: ...5 28 Hardkey and Softkey Reference Amplitude ...
Страница 166: ...5 30 Hardkey and Softkey Reference Arrow Keys ...
Страница 168: ...5 32 Hardkey and Softkey Reference Display Contrast Keys ...
Страница 188: ...5 52 Hardkey and Softkey Reference FM ...
Страница 196: ...5 60 Hardkey and Softkey Reference Frequency ...
Страница 198: ...5 62 Hardkey and Softkey Reference Help ...
Страница 200: ...5 64 Hardkey and Softkey Reference Hold ...
Страница 202: ...5 66 Hardkey and Softkey Reference Incr Set ...
Страница 236: ...5 100 Hardkey and Softkey Reference LF Out ...
Страница 238: ...5 102 Hardkey and Softkey Reference Local ...
Страница 240: ...5 104 Hardkey and Softkey Reference Mod On Off ...
Страница 242: ...5 106 Hardkey and Softkey Reference Mode ...
Страница 336: ...5 200 Hardkey and Softkey Reference Mode GSM ...
Страница 422: ...5 286 Hardkey and Softkey Reference Mode PDC ...
Страница 466: ...5 330 Hardkey and Softkey Reference Mode PHS ...
Страница 532: ...5 396 Hardkey and Softkey Reference Numeric Keypad ...
Страница 554: ...5 418 Hardkey and Softkey Reference Power Switch ...
Страница 564: ...5 428 Hardkey and Softkey Reference Preset ...
Страница 570: ...5 434 Hardkey and Softkey Reference Pulse ...
Страница 574: ...5 438 Hardkey and Softkey Reference Recall ...
Страница 576: ...5 440 Hardkey and Softkey Reference Return ...
Страница 578: ...5 442 Hardkey and Softkey Reference RF On Off ...
Страница 584: ...5 448 Hardkey and Softkey Reference Save ...
Страница 604: ...5 468 Hardkey and Softkey Reference Sweep List ...
Страница 666: ...7 20 Operation Userfile Applications ...
Страница 675: ...8 9 Safety and Regulatory Declaration of Conformity Declaration of Conformity ...