Data AcQuisition And Real-Time AnalysisScope - Spectrum - Spectrogram - Signal Generator
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Revision History - v3.50
Daqarta v3.50 - 1 October 2007:
Trigger Hysteresis control added for better noise rejection during trace sync and Frequency Counter operation.
When Trigger Control dialog is active while in waveform display mode, Trigger Level is now shown as a draggable horizonal line, with Hysteresis limits shown as draggable dotted lines above and below it.
Trigger Source channel actually in use is now shown by a small red square on its selector button. The button selection no longer changes if that channel becomes inactive; the red indicator just moves to an active channel, and is restored to the selected channel when it again becomes active. This keeps the selected Source when Input or Generator is toggled off and back on again.
Spectrum Cursor Peak option provides frequency and amplitude resolution comparable to 65536-point FFTs from 1024-point data.
Spectrum Cursor Track option automatically maintains the solid cursor over the largest spectral peak at all times.
If the Input dB button is active on a calibrated line, the Input Line Level (volume) and Master Level (if present) scroll only to real attenuator steps where dB changes, bypassing all the dummy steps inserted by Windows.
Display Channel button selections are now retained when their respective Generator or Input channels are off, including across Daqarta session exit and restart.
Managing Multiple Devices explains how to use new shortcut command-line parameters with multiple cards, USB cards, or for running Daqarta from a removable drive on multiple systems.
Burst Train Cycle now provides "infinite" delay after the first full burst train when the maximal value is entered, allowing single-presentation tests.
Full-Scale Range calibration dialog now has separate entries for Stereo and Mono Input ranges, since in mono mode sound cards typically sum both input channels and cut the sensitivity in half.
All mixer settings now saved before start, including those that Daqarta itself does not control, and restored on exit. Any changes made during operation, whether from within Daqarta or via another mixer controller, are saved at exit in Daqarta0.MIX and restored at the next start.
Daqarta now blocks the annoying beep that Windows inserts when the Master output slider is changed via the Windows Mixer. (There has never been a problem using only Daqarta's own controls.)
Improved input/output sync stability when both are active.
Improved handling of DDisk toggle and recording when hard drive space is low.
.TXT file headers now include the name of the spectrum window function, where relevant. If Spectrum Cursor Peak is active, solid and dotted high-resolution readouts are now included after main data following one blank line.
Increased duration and sensitivity of Auto-Calibrate initial line detection test to avoid spurious non-detection. Right Input now set to same line as Left, but volume set to minimum to prevent spurious input signal interference.
Troubleshooting section added.
After a control entry is concluded with Enter, focus returns to the main window to allow the horizontal arrow keys to move the trace cursors, instead of moving in the control.
Notes area widened to match trace area. If pop-up Notes window is used, it now retains its previous position and is independent of other dialogs.
Cursor Sigma Readout accuracy improved at low levels.
Sigma now always uses the channel of the solid cursor in computations, even if the dotted cursor is set to a different channel. To make this clearer, the Sigma symbol is now shown in the trace color of the solid cursor channel, instead of the solid cursor color itself.
Spectrum Cursor Ratio accuracy improved at low levels.
Histograms now allocate bins by rounding instead of truncation, to improve accuracy.
File Open dialog now shows 'All Data Files (.DQA, .WAV. DAT)' by default, but individual file types can still be selected via drop-down control.
Output-only sound cards are now supported for Generator operation.
When a file has been saved, the name of the file is now shown after the "bytes written" message.
Bug Fix: Faulty display sync for mismatched Generator vs. Input channel counts (2 Out / 1 In, or 1 Out / 2 In).
Bug Fix: Wave output volume was getting set to minimum on Daqarta exit. Now restored to pre-Daqarta settings.
Bug Fix: Trigger Holdoff did not work properly at high settings. (Maximum allowable setting now greatly increased as well.)
Bug Fix: Default folder for saving .CAL and .CRV files was User_Data. Now defaults to App_Data, same as for loading them.
Bug Fix: On sound cards without Master Input controls, Mic or Speaker .CAL files could not be loaded even if an input User Line was calibrated.
Bug Fix: Current SPL state was not restored on next session start for .CAL files with 'Pa' units.
Bug Fix: Long .CAL files (over 4 KB) could be mis-read.
Bug Fix: X-axis tick marks and labels did not always line up properly with cursors and trace data.
Bug Fix: Histogram eXpand Max and Min were not properly limited to 1.0000.
Bug Fix: Very small Trigger Level values were not handled properly via direct entry.
Bug Fix: After an initial Sgram display sweep on a DDisk file, hitting Home or manually changing position with <> keys properly showed the new start position for the trace. But hitting unPause did not properly update that to the end of the prior trace as action continued.
Bug Fix: Sgram display of a DDisk file did not run properly in unPaused Triggered mode, and showed wrong X-axis calibration.
Bug Fix: Auto-Calibrate Cancel button sometimes required multiple hits to take effect.
Bug Fix: Moving Duplex Delay summary dialog caused subsequent dialogs to open in wrong positions. Also, the default Duplex Delay dialog position has been moved to the right so trace alignment can be seen without moving anything.
Bug Fix: Some sound cards were treated as having uncalibrated inputs even after calibration.
Bug Fix: Full-duplex operation on Mac Mini running XP could crash.
Bug Fix: Sound cards that reported an erroneous number of channels (-1, or only 1 on a stereo card) failed to work properly.
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