User manual FLUKE 92B

[. . . ] 92B/96B/99B/105B ScopeMeter Users Manual 4822 872 00724 March 1996, Rev. 4, 1/99 1996, 1999 Fluke Corporation. Printed in the Netherlands All product names are trademarks of their respective companies. I TABLE OF CONTENTS CHAPTER 1 INTRODUCING YOUR SCOPEMETER TEST TOOL SCOPEMETER TEST TOOL FEATURES . 1-2 USING THE HOLSTER AND THE TILT STAND . [. . . ] Use or to set the trigger time delay in increments of the existing time base divisions. For example, if the time base is set to 2ms/DIV, +16 defines a delay of 16 time divisions (32 milliseconds) after the trigger is detected. From the second page of the MORE TRIGGER window, select TRIGGER SPECIAL DELAY (off, Events, or N-Cycle). N-CYCLE The trigger waveform is divided by the number of cycles "N" to create a stable picture for waveforms with a cyclic character. (N-CYCLE can be used only on INPUT A. ) Use or to select the number of cycles. A total of +2 to +255 cycles can be selected. EVENTS Triggering via the external input is delayed for a number of events that occur on INPUT A. Use or to select the number of events (+1 to +1023). External trigger starts the delay, and after the number of events on INPUT A is equal to the selected number, the test tool acquires the INPUT A signal. 3. Press Automatic Trigger Level To give you a stable display, the ScopeMeter test tool can find the best trigger level automatically. To activate this feature, press to open the ADJUST LEVEL box; then press a second time to select AUTO LEVEL. The trigger level will now be set and continuously adjusted to the optimal level, even when the signal changes. Choosing a Trigger Delay You can also begin to display the waveform at some time before or after the trigger point is detected. This is identified by the delay icon "T" on the top of the display. From the second page of the MORE TRIGGER window, select RESET DELAY to reset all the selected trigger delays to their initial values (TIME DELAY : -2, TRIGGER SPECIAL DELAY: OFF). Using in Scope Mode The TV Triggering Function The TV trigger function allows you to examine frames, fields, and lines of TV signals for various TV systems. 5 - 15 Overview of the TV Trigger functions To use the TV trigger function, press ; then press to open the TV trigger menu shown in Figure 5-12. You can select one of the following three TV trigger functions: 1. LINES is used to trigger on the synchronization pulse of all lines (horizontal synchronization). Figure 5-12. FRAME is used to trigger on the synchronization pulse of frames (vertical synchronization). With a low-speed time base (10 ms/div) you can look at a full frame. With a high-speed time base (10 µs/div) you can look at line #1. SELECT LINE is used to select the line number within frames. TIME DELAY is used to shift the beginning of the waveform display at some time before or after the trigger point in all trigger functions. 5 - 16 Selecting TV System and Scan Rate Before using TV triggering, make sure that the test tool is set for the correct TV system and scan rate. [. . . ] Screen The complete image of the display. Pulse Width The duration from the beginning to the end of a signal's on-time or off-time. Range The quantity between two points or levels. Recall The function of loading a stored Setup, Screen, or Waveform back into the ScopeMeter test tool. Recurrent The ScopeMeter test tool continuously (recurrently) updates the display. This gives a dynamic look at the waveform activity as it occurs. [. . . ]