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<h4><a name="Trigger Source"></a>Trigger &nbsp;&nbsp;
<a href="javascript:void(0);" onClick="var e; if (parseInt(navigator.appVersion)>=4){e=event;}  if (parseInt(navigator.appVersion) >=2 && typeof(PopupMenu_Invoke) == 'function') PopupMenu_Invoke(e,'','Sweep Types','Sweep_Type.htm','Trigger Settings','Trigger_Settings.htm');return false;" title="Related Topics"><img src="../../../ss_btn_related_topics1.gif" border=0 height=17 width=82 alt="Related Topics"></a>

 </h4>

<p>The <span style="font-style: italic;"><I>Trigger</I></span> submenu selects 
 the source of the trigger signal and provides additional <span style="font-style: italic;"><I>Trigger 
 Settings</I></span>. </p>

<p><img src="../../../small_images/info_red.jpg" x-maintain-ratio="TRUE" width="32px" height="37px" border="0" class="img_whs1"> <a class="dropspot" href="javascript:kadovTextPopup(this)" id="a9" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Trigger 
 system of the analyzer</a><script type="text/javascript"
														language=JavaScript1.2><!--
kadovInitEffects('a9');
//--></script></p>

<div class="droptext" id="POPUP170795283" style="display: 'none'; " x-ss-type="dropdown">
 <p>The trigger system is used to synchronize the analyzer's actions with 
 events that can be provided by an internal or external signal or user-generated 
 <span style="font-style: italic;"><I>(Manual Trigger</I></span>). Triggered measurements 
 are an alternative to the default mode <span style="font-style: italic;"><I>(Free 
 Run, Continuous Sweep)</I></span>, where the measurement is continuously repeated 
 without fixed time reference. </p>
 <p>Any trigger event may start an entire sweep or a part of it. Moreover, 
 it is possible to switch off the RF source between consecutive triggered 
 measurement sequences, and to define a delay between trigger events and 
 the measurement sequences. </p>
 <p class=Note><img src="../../../small_images/note.jpg" x-maintain-ratio="TRUE" width="36px" height="37px" border="0" class="img_whs2"> The trigger settings are also valid for calibration 
 sweeps (see <span style="font-style: italic;"><I><a HREF="../Calibration/Guided_Calibration.htm#Measure_Standards"
													id=a30
													style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Measure 
 Standards</a></I></span> 
 dialog). This means that, in external trigger mode, the external trigger 
 signal must be available during the system error correction, too. To start 
 the calibration sweeps without delay, use the <span style="font-style: italic;"><I>Free 
 Run</I></span> trigger type. </p>
</div>
<p class=Figure><img src="Trigger_menu.gif" width="430px" height="278px" border="0" class="img_whs3"></p>

<ul type="disc" class="whs4">
	
	<li class=kadov-p-CList><p class=List><span style="font-style: italic;"><I><a 
 href="Trigger.htm#Free_Run"
	id=A13
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Free 
 Run</a><script type="text/javascript"
									language=JavaScript1.2><!--
kadovInitEffects('A13');
//--></script></I></span> 
 is the default trigger mode. A new measurement is started immediately 
 without waiting for a trigger signal and without fixed time reference. 
 </p></li>
	
	<li class=kadov-p-CList><p class=List>The<span style="font-style: italic;"> 
 <I><a href="#External_Trigger"
	id=a3
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">External</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
kadovInitEffects('a3');
//--></script></I></span> 
 trigger signal is applied to the <span style="font-style: italic;"><I>EXT 
 TRIGGER </I></span>or <span style="font-style: italic;"><I>USER CONTROL</I></span> 
 connector at the rear panel. </p></li>
	
	<li class=kadov-p-CList><p class=List>The <span style="font-style: italic;"><I><a 
 href="#Periodic_Trigger"
	id=a2
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Periodic</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
kadovInitEffects('a2');
//--></script></I></span> 
 trigger signal is provided by an internal clock generator. </p></li>
	
	<li class=kadov-p-CList><p class=List>In <span style="font-style: italic;"><I><a 
 href="#Manual"
	id=a12
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Manual</a><script 
 type="text/javascript"
	language=JavaScript1.2><!--
kadovInitEffects('a12');
//--></script></I></span> 
 trigger mode, the trigger signal is generated on pressing the <span style="font-style: italic;"><I>Manual 
 Trigger </I></span>softkey. </p></li>
	
	<li class=kadov-p-CList><p class=List><span style="font-style: italic;"><I><a 
 HREF="Trigger_Settings.htm"
	id=A10
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Trigger 
 Settings</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('A10');
//--></script></I></span> 
 opens a dialog to specify the operation that the analyzer carries out 
 after receiving a trigger event. </p></li>
</ul>


<hr align="center" width="50%" class="whs5">


<h5><a name=Free_Run></a>Free Run</h5>

<p>In <span style="font-style: italic;"><I>Free Run </I></span>mode a new measurement 
 is started immediately without waiting for a trigger event and without 
 fixed time reference. The <span style="font-style: italic;"><I><a href="Trigger_Settings.htm"
	id=a21
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Trigger 
 Settings</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('a21');
//--></script></I></span> 
 are not valid. </p>

<p><span style="font-style: italic;"><I>Free Run</I></span> means that a measurement 
 in <span style="font-style: italic;"><I>Continuous Sweep </I></span>mode is repeated 
 as fast as possible. </p>

<p class=Linkline
	style="x-condition: OLH;"><span class=dropspot><img src="../../../small_images/helpwoval3.gif" x-maintain-ratio="TRUE" width="42px" height="18px" border="0" class="img_whs6"></span> 
 <a HREF="../../../Measurement_Examples/Optimization/Optimizing_the_Measurement_Speed.htm#Meas_Sequence" id="A28" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Optimizing 
 the measurement speed</a><script type="text/javascript"
														language=JavaScript1.2><!--
kadovInitEffects('A28');
//--></script> 
 </p>

<table x-use-null-cells class="whs7">

<tr valign="top" class="whs8">
<td colspan="1" rowspan="1" width="24%" class="whs9">
<p class="whs10">Remote control:</td>
<td colspan="1" rowspan="1" width="76%" class="whs11">
<p class="whs12"><a HREF="../../../SCPI_Reference/TRIGger/TRIGger.htm#SOURce"
													id=A14
													style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">TRIGger[:SEQuence]:SOURce 
 IMMediate</a><script type="text/javascript"
											language=JavaScript1.2><!--
kadovInitEffects('A14');
//--></script> 
 </td></tr>
</table>


<hr align="center" width="50%" class="whs5">


<h5><a name=External_Trigger></a>External Trigger</h5>

<p>In <span style="font-style: italic;"><I>External </I></span>trigger mode the 
 measurement is triggered by a low-voltage (3.3 V) external TTL signal 
 applied either to the BNC connector <span style="font-style: italic;"><I><a 
 HREF="../../../HW_Interfaces/Rear_Panel_Connectors.htm#EXT_TRIGGER"
	id=A23
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">EXT 
 TRIGGER</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('A23');
//--></script></I></span> 
 or to pin 2 of the<span style="font-style: italic;"> <I><a HREF="../../../HW_Interfaces/Rear_Panel_Connectors.htm#USER_CONTROL"
														id=A24
														style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">USER 
 CONTROL</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('A24');
//--></script></I></span> 
 connector at the rear panel. The two trigger inputs are equivalent; nor 
 additional setting for signal routing is required. </p>

<p>Selecting <span style="font-style: italic;"><I>External </I></span>opens a 
 dialog to select whether the rising or the falling edge of the external 
 trigger signal provides the trigger event. </p>

<p class=Figure
	style="x-condition: Webhelp_Print;"><img src="External_Trigger.jpg" width="167px" height="137px" border="0" class="img_whs13"></p>

<p class=Note><img src="../../../small_images/note.jpg" x-maintain-ratio="TRUE" width="36px" height="37px" border="0" class="img_whs14">The period of the external trigger signal 
 should be adjusted to the <a HREF="Trigger_Settings.htm#Triggered_Meas_Sequence"
								id=A11
								style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">triggered 
 measurement sequence</a><script type="text/javascript"
													language=JavaScript1.2><!--
kadovInitEffects('A11');
//--></script>. 
 If the analyzer receives a trigger event while the last sequence is still 
 running, the trigger event is skipped and a message <span style="font-style: italic;"><I>Trigger 
 event missed</I></span> is displayed. </p>

<table x-use-null-cells class="whs7">

<tr valign="top" class="whs8">
<td colspan="1" rowspan="1" width="24%" class="whs9">
<p class="whs10">Remote control:</td>
<td colspan="1" rowspan="1" width="76%" class="whs11">
<p class="whs12"><a HREF="../../../SCPI_Reference/TRIGger/TRIGger.htm#SOURce"
													id=A15
													style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">TRIGger[:SEQuence]:SOURce 
 EXTernal</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('A15');
//--></script><a 
 HREF="../../../SCPI_Reference/TRIGger/TRIGger.htm#SLOPe"
	id=A16
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ "><br>
TRIGger[:SEQuence]:SLOPe</a><script type="text/javascript"
														language=JavaScript1.2><!--
kadovInitEffects('A16');
//--></script> 
 </td></tr>
</table>


<hr align="center" width="50%" class="whs5">


<h5><a name=Periodic_Trigger></a>Periodic Trigger</h5>

<p>In <span style="font-style: italic;"><I>Periodic </I></span>trigger mode the 
 measurement is triggered by the periodic signal of an internal clock generator. 
 Selecting <span style="font-style: italic;"><I>Periodic </I></span>opens the 
 numeric entry bar to select the trigger period.</p>

<p class=Figure><img src="Trigger_Period.gif" width="384px" height="22px" border="0" class="img_whs15"></p>

<p>The minimum trigger period that can be set corresponds to the estimated 
 duration of the <a href="Trigger_Settings.htm#Triggered_Meas_Sequence"
					id=a5
					style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">triggered 
 measurement sequence</a><script type="text/javascript"
													language=JavaScript1.2><!--
kadovInitEffects('a5');
//--></script>. 
 &nbsp;</p>

<p><span class=dropspot><img src="../../../small_images/note.jpg" x-maintain-ratio="TRUE" width="36px" height="37px" border="0" class="img_whs14"><a class="dropspot" href="javascript:kadovTextPopup(this)" id="a53" style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Time 
 sweep</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('a53');
//--></script></span></p>

<div class="droptext" id="POPUP171690185" style="display: 'none'; " x-ss-type="dropdown">
 <p>T<span class=dropspot>he periodic trigger is incompatible with </span><span 
 class=dropspot
	style="font-style: italic;"><I><a HREF="Sweep_Type.htm#CW_Time"
									id=a27
									style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">Time</a></I></span><span class=dropspot>sweeps: If a </span><span class=dropspot
														style="font-style: italic;"><I>Time 
 </I></span><span class=dropspot>sweep is selected while the periodic trigger 
 is active, the analyzer generates an error message:</span><span class=dropspot
	style="font-style: italic;"><I></I></span></p>
 <p class=Figure><span class=dropspot><img src="Timer_Conflict.jpg" width="356px" height="119px" border="0" class="img_whs16"></span></p>
 <p><span class=dropspot>To continue, click </span><span class=dropspot
														style="font-style: italic;"><I>OK 
 </I></span><span class=dropspot>and select any other trigger or sweep type 
 (e.g. </span><span class=dropspot
					style="font-style: italic;"><I><a HREF="Sweep_Type.htm#CW_Trigger_Events"
													id=a22
													style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">CW 
 Mode</a></I></span><span 
 class=dropspot>). </span></p>
</div><table x-use-null-cells class="whs7">

<tr valign="top" class="whs8">
<td colspan="1" rowspan="1" width="24%" class="whs9">
<p class="whs10">Remote control:</td>
<td colspan="1" rowspan="1" width="76%" class="whs11">
<p class="whs12"><a HREF="../../../SCPI_Reference/TRIGger/TRIGger.htm#SOURce"
													id=A17
													style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">TRIGger[:SEQuence]:SOURce 
 TIMer</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('A17');
//--></script><a 
 HREF="../../../SCPI_Reference/TRIGger/TRIGger.htm#TIMer"
	id=A18
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ "><br>
TRIGger[:SEQuence]:TIMer</a><script type="text/javascript"
														language=JavaScript1.2><!--
kadovInitEffects('A18');
//--></script></td></tr>
</table>


<hr align="center" width="50%" class="whs5">


<h5><a name=Manual></a>Manual Trigger</h5>

<p class=Linkline>In <span style="font-style: italic;"><I>Manual </I></span>trigger 
 mode the trigger signal is generated on pressing the <span style="font-style: italic;"><I>Manual 
 Trigger </I></span>softkey. <span style="font-style: italic;"><I>Manual Trigger</I></span> 
 is disabled unless manual trigger mode is active. </p>

<table x-use-null-cells class="whs7">

<tr valign="top" class="whs8">
<td colspan="1" rowspan="1" width="24%" class="whs9">
<p class="whs10">Remote control:</td>
<td colspan="1" rowspan="1" width="76%" class="whs11">
<p class="whs12"><a HREF="../../../SCPI_Reference/TRIGger/TRIGger.htm#SOURce"
													id=A20
													style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ ">TRIGger[:SEQuence]:SOURce 
 MANual</a><script type="text/javascript"
										language=JavaScript1.2><!--
kadovInitEffects('A20');
//--></script><a 
 HREF="../../../SCPI_Reference/Common_Commands.htm"
	id=A29
	style="/*begin!kadov{{*/ position: relative; /*}}end!kadov*/ "><br>
*TRG</a><script type="text/javascript"
									language=JavaScript1.2><!--
kadovInitEffects('A29');
//--></script></td></tr>
</table>


<hr align="center" width="50%" class="whs5">


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