************************************************* * Channel 1 - 4 * ************************************************* 1. Center Channel ------------------------- Sets the virtual zero voltage (Y-position) to the screen middle. 2. Dispatch Channel ------------------------- Depending on the number of active channels the zero levels are dispatched on the screen with the focus to have maximum place for every channel. If only one channel is active => dispatch = center ************************************************* * Acquire * ************************************************* 1. Noise Filter ---------------------- engl. - Filter characterisics (cut off frequency) at 1GSa/s: germ. - Die Filter haben folgende Eckfrequenzen bei 1GSa/s: Proprietary algorithm - Smooth ca. 80 - 90Mhz -> in all other TB cutoff frequ. is half sample rate that means lossless! - Strong ca. 30 Mhz -> because of overlapping here is a loss of bandwidth IIR algorithm - IIR 1 Stage ca. 70 - 80Mhz IIR-filter with 1 stage and coefficient 0.5 - IIR 2 Stage ca. 35 - 40Mhz IIR-filter with 2 Stages and coefficients 0.5 - IIR 3 Stage ca. 20MHhz IIR-filter with 3 Stages and coefficients 0.5/0.5/0.25 - very aggressive! The IIR-filters are producing a little dc-offset depending on the noise level of the signal. The filter functions are using own memory areas for their results - what does that mean? In Stop mode You can scroll through the memory with filter switched on. Scrolling happens in the filter buffer. Filter can be switched in Stop mode and shows effect immediately. ************************************************* * Display * ************************************************* 1. Switch Grid ------------------------------ In time domain - that means TY-mode, XY-Mode, the grid can be switched between dotted lines and solid lines. In delayed mode dotted lines are forced, no switching is possible. In frequency domain - that means FFT-Mode, the grid can be switched between dotted lines and solid lines. Additionally You can choose wether You prefer 8 divs or 10 divs over the frequency range. 2. Switch drawing ----------------------------- In time domain two drawing modes are available: - fast drawing with vertical pixel connection. Increases the refresh rate. - accurate drawing with line function. Signals will be displayed more accurately but the refresh rate will decrease a little bit. ************************************************* * Save / Recall * ************************************************* 1. Overlay Trace ------------------------------- A signal with its settings (trace) can be loaded from a coosen memory place (as Recall Trace). This loaded signal will be overlayed over the actual Signal which is adapted to the trace settings. So it is possible make a direct comparison between trace and actual signal. 2. Restore Settings ------------------------------ After choosing "Recall Trace" or "Overlay Trace" the settings from before are gone. Pushing "Restore Settings" will load the settings from before from flash. ************************************************* * Quick Print * ************************************************* 1. Choose the screenshot version --------------------------------------- - the BF-version is completly controlled by the DSO - the OS-version can trigger screenshots remotly The versions are not compatible and will work only with the correct menu setting! 2. Additional Function of the Quick Print button ------------------------------------------------- Double pushing the Quick Print button will trigger a screenshot without changing the menu. So You are able to make a screenshot from Your actual situation. ************************************************* * Trigger Setting (Edge) * ************************************************* 1. Auto Pretrigger ---------------------- engl. - What does it do and how does I find it? germ. - Was macht das Ding und wie finde ich es? engl. - the memory window (displayed in the memory browser) is set to the start address of the value buffer. germ. - Der für die Anzeige verwendete Speicherausschnitt wird ganz an den Anfang des Wertespeichers gesetzt engl. - the pretrigger is set to the screen middle. germ. - Der Pretrigger wird auf die Bildschirmmitte gesetzt engl. - change to edge menu and push the pretrigger softbutton on which the pretrigger time is displayed. germ. - Ins Edge Menu wechseln und auf den Pretrigger Softbutton drücken der sonst nur die Pretriggerzeit anzeigt. 2. Trigger Auto Level ------------------------- Trigger Level is set to the signal middle of the active source channel. ************************************************* * Trigger Mode/Coupling * ************************************************* 1. Mode Coupling ------------------------ Pushing the Mode/Coupling button the first time will change to the Mode/Coupling menu. Every additional pushing will change the trigger mode which normally is changed by the mode pulldown menu (softbutton 1). ************************************************* * Hardwaresettings * ************************************************* 1. The ADC Setup ------------------------------------ The factory setting results in a resonance problem at higher frequencies on some devices. The HF-setting deactivates some filters in the readout logic of the FPGA. This should make you able to measure frequencies up to 150 MHz and more. I always use the HF-Setting because it has the best results on my two DSOs. A few Users had some problems with spikes, so there are some other test settings to find out which one matches best to Your device. 2. Pre Gain Setting ------------------------------------------- The Pre Gain menu allows you to override the Factory setting of gain 1 at the 1er and 2er ranges with the gain 1.25 - this may have a positive effect to the noise level. The other settings are for hardware modifications in the preamp stage on the mainbord. Some users exchanged the line resistors (0 Ohm) at the preamp input against 33 Ohm. Due to that You can choose other scaling factors in this menu which fit to those modifications. As to read in the hardware thread http://www.mikrocontroller.net/topic/1661333#postform there is planned a little preamp board as a new input stage. For this modification I added the Add On entry. Regards Hayo