Changes of P750 versions from 1.0 and up

Changes from version 1.0 to 1.0-a

a) Slope test added.

Changes from version 1.0-a to 1.0-b

a) Selection of Graph background black / white added.
Curve type fine / bold added.
Selection of font size added.

b) No of test points con now be selected from 125 to 500 test points.

c) Sync burst have been added to synchronize received frequency response is wireless speakers is used.

Changes from version 1.0-c to 1.0-d

a) Check for error in cfg file added.

b) Selection of output signal to be used as Intern L&R (use build-in power amplifier) or as Left external / Right external added to edit menu.

Changes from version 1.0-d to 1.0-e

a) Utility functions using a4m-stat.dat database added a filter to avoid empty records there can jam the database structure.
An empty record can be generated by a power interrupt while data are whiting on database.
Numbers of maximal processed records are changed from 64000 to 512000.
Date filtering did not work on the year when format “MMDDYYmmss” was used. This is corrected.

b) The “dat” format used by save data in “a4m-stat.dat” file has been changed to version “32”. Information regarding filter display gain of +20 db for filters B & D and filter in Thd test has been added to file format.
As result the utility convert function now correct converted data with a correct values when the display filter gain was used with +20db.
Note: this version can read process older versions of the “dat” files. Utilities where the “dat” files are used can NOT read the new “dat” file format.

c) Selection of displayed curves in Utility mode was enable/disable of max and min curves changeover. This is corrected.

d) In edit-mode the save tolerance curves by mistake only allowed 4 characters. This is corrected to the default 12 charters long.

e) As 500 points was added in version b an display error was introduced in edit-mode pulse-polarity display if the number of points was different from 500. This display error is corrected.

f) In edit-mode when the “type” name was changed and then saved as reference the upper 2.limit was not saved. This error is corrected.

g) In version 1.0-b and c the system crash if an older LOG database was used. This error is corrected. To overcome this problem before this correction just delete the LOG dir.

h) Saving multi passwords did only save the first password. This is corrected to allow more than 1 password to be saved.

i) The “Running” info was not displayed in edit mode then test was executed.

j) The search for dongle-key type has been modified. The memory button DS1991 / DS1425 is obsolete for new systems.
A replacement type DS1961S has been added for new systems.

k) Sensitivity test with move flag ON did not work correct with a complex curve shape.
As result sensitivity test was ok but the test by error force test for upper & lower limits On “Ch A” off with an approved result.
This error is corrected.

Changes from version 1.0-e to 1.0-f

a) In Global menu when extern amplifier was selected the Test signal on did not respond if activated unless the edit or run mode was entered first. This is corrected.

b) A filter added to avoid empty records there can jam the database structure.
An empty record can be generated by a power interrupt while data are whiting on database.
Numbers of maximal processed records are changed from 64000 to 512000.
Date filtering did not work on the year when format “MMDDYYmmss” was used. This is corrected.

c) Cursor readout value was in Log mode displayed wrong values depending of setup. This is corrected.

Changes from version 1.0-f to 1.0-g

a) Cursor movement (left or right) give 1 unrestored pixel error if a “cfg” file not was up to date.
A check and a correction for this are added.

Changes from version 1.0-g to 1.0-h

a) The C4dll.dll is now included in the main program and therefore is no longer used. This enables a pure win32 and win64 version of program.

b) First time the P750 program is used, windows 10 update the registry database and as result the measurement due to internal timing is wrong. Curves are shifting to right.
To avoid this P750 program now check if the program is used first time on the location on disk now give information that program need to be restarted.

Changes from version 1.3-h to 1.3-i

a) The isDS1961.exe program was deleted / renamed or modified by some antivirus programs. The purpose of the program was to test that DS1991, DS1425 or DS1961S was mounted on PC by returning different error codes.

The test for the devices is changed and added into the main program.

b) Some variables were not set before a Sync burst was run if activated in selected type setup. This could in some cases give an error. This is corrected

Changes from version 1.3-i to 1.3-j

a) The C4dll.dll is now included in the main program and therefore is no longer used. This enables a pure win32 and win64 version of program.

b) First time the program is used, windows 10 update the registry database and as result the measurement due to internal timing is wrong. Curves are shifting to right.

c) To avoid this program now check if the program is used first time on the location on disk now give information that program need to be restarted.

d) When “deleting selected type from statistical file” (*.dat file) from utility the data got in some case corrupted. This is corrected.

e) A new test has been added to system. A Hi-2 or a Blat distortion test with reference to David Clark paper 950189.

f) In utility convert dat file line mode test result and valued are now decoded in clear text.

g) When results on in txt format are used (see global setup) text is now decoded in clear text.

h) System can be forced to old format by adding following command line “p80 = OFF” in file alt4-sw.cfg file located at the program path.

i) A new test added. The R-test. This R (resonance) test is like the resonance test able to test a maximum or a minimum frequency of a part of the impedance curve.

j) On run menu the data from Resonance-test and R-test values are displayed by toggle the values on-off by “F8”.

k) When filter are used in relative or in % mode the +20 db gain is now activated to give better dynamic range (noise floor interference).

l) In utility log manager list of the year to clean is changed from year 20 to year 30.

m) In utility log some parameters was listed even there was no changes. Example a parameter was changes from ON to ON. This is corrected.

n) Slope test, Hi-2 test and R-test added to “Hw Config Menu”.

o) If control was used selected in Hw Config Menu the I/O code 7 selected in setup menu was not saved. This is corrected.

p) Sync burst did not work in run-mode. This error is corrected.

q) Reference curves on BL displayed last reference point wrong. This is corrected. The display error did not affect the measurement and test.

r) Smooth in Bl made wrong smooth at the first measured points. This is corrected.

s) Bl curve moved to right depending of used delay in setup. This is corrected. Delay no longer move Bl curve.

t) Improved High pass limit for sample frequency 96000 and higher to reduce noise flour if limit is set to 45 Khz.

Changes from version 1.3-j to 1.3-k

a) When Curve Editor under Edit Curve menu was used and empty frequency and value was entered an unpredicted result could be returned. This is corrected.

b) Start background picture is now rescaled when window size is changed.

Changes from version 1.3-k to 1.3-l

a) High Pass Filter in channel D did not select stored frequency. It was by mistake set to 2000 Hz. This is corrected.

Changes from version 1.3-l to 1.3-m

a) If chain was used and resonance test was used in channel C the curve was changed to reject color if first test was called and rest was test was displayed. Test was ok.

This is corrected.

b) In edit mode not all curve limits was saved if the selected type was changed in number of test points.

This did only happened if previous (1 before) saved type had less selected points than the current saved version and the version before the previous version (2 time before) was bigger than the previous.
This error is corrected.