When making measurements with the Digital Storage Oscilloscope / Logic Analyzer Cards, meaningful data can only be captured with some prior knowledge of the characteristics of the circuit under test.
Before initiating any capture cycles, the DSO must be configured using the control program. See the software section later in the manual for instructions on these procedures.
To connect the DSO to the test circuit, there are two standard BNC probes, one for each Analog input channel, and a series of mini-clips on the Logic Analyzer Pod for the Logic input channels. The scope probes have removable hook clips on their ends and an attached alligator clip for the signal ground connection. The Logic Analyzer Pod has inputs for 16 channels, D0 channel is the external clock input, and 4 ground points.
For synchronous data captures, external clock sources can be connected to the D0 channel.

At times, it may also be necessary to connect the test circuit to the computer system itself. This will eliminate more noise in the test application due to ground level differentials. This is especially true when dealing with high speed timing analysis. Use a heavy gauge wire to make a connection between the test circuit ground and the case of the computer.

Each Analog channel probe has a calibration adjustment. It is important that this calibration be made at least twice a year. See Calibration for more information.

WHEN CONNECTING THE PROBES TO ANY SIGNAL, MAKE SURE THAT THE SIGNAL VOLTAGE IS WITHIN THE LIMITS OF THE DSO. CHECK THE TECHNICAL INFORMATION SECTION FOR ABSOLUTE MAXIMUM AND RECOMMENDED MAXIMUM INPUT VOLTAGES FOR THE PROBES.

Logic Analyzer Pod Markings:
    D0-D15 Channel  data inputs.
    GND Signal ground connection.

• Innovative cross triggering: logic analyzer channels can trigger the analog channels and vice versa .

• Long time pre-triggering up to 65534*512 points, about equal to 33Mbyte storage.

• Fast data capture and screen update rates.

• Hot key function that is convenient to use.

• Deep 128k sample data acquisition buffers on each channel(A1, A2, D0-D15).

• Precision 100MHz Frequency counter, up to 7 digital resolution  @ 128k memory for each analog channel.

• Advance Fast Fourier Transformations function to Bandwidth test.

• Convenient Timing state display for logic debug.

Horizontal Scroll Bar:
    This scroll bar is used in conjunction with a selected waveform or cursor. The Horizontal Scroll Bar will move

    a selected waveform or cursor left or right in the display area.

    The Horizontal Scroll Bar works with Display, Analog input channels, Memory, Logic Analyzer channels,

    V1Bar, V2Bar, and Trigger Bar.

Vertical Scroll Bar:
    This scroll bar is used in conjunction with a selected waveform or cursor.

    The Vertical Scroll Bar will move a selected  waveform or cursor up or down in the display area.

    The Vertical Scroll Bar works with Display, Analog input channels, Memory, H1Bar, and H2Bar.

Load data    This option loads a data file (.dso), with a setting file (.ini) together.

Load data option    This option select of A1, A2 or D0-D15 channel to be load.

Save setting    This option saves the current settings to a setting file (.ini).

Save data    This option saves a data file (.dso), every time saves all (A1,A2,D0...D15) data depend on

                       Depth setting.

Transfer data to  Excel    This option will convert data to Microsoft Excel by Decimal, Hexdecimal,

                                               Ascii or Unit(v).

Load setting    This option loads a previously Setting file (.ini).

Load Default Setting   Reset all parameters to factory defaults.

Auto Load settings    Auto load Dso25216.ini setting file on program start run to set all configuration.

Print Screen    This option allows you to print Screen (Hard copy). 

Print FFT    This option allows you to print FFT Form. 

Print Timing View    This option allows you to print Main Screen Form. 

Exit    Exit DSO software.  

Status Bar             Show or hide Status Bar.

Channel display  Select  display Channel(A1,A2,M1,M2,F1,D0-D15).

D0-D15 Height     Adjust height of logic channel(d0-d15).

Time or Samples For Timing display, display Time like as 12.34ms, or display how many samples.

Grid                         Show or hide grid on analog display.

Dots connect        Displays analog data points and  connections between data points.

Zoom view            Compress and display the entire memory on the up screen.

Persistence          Data from previous captures remains on screen and is overlaid by new data.

Zoom align from  Set cursor Bar(V1, V2, Trigger, Screen (left or center) ) for zoom

                                 operate reference.

 The Go command tells the DSO  to start acquiring data when the trigger

      conditions are satisfied. 
      Pressed means Start capture, unpressed means stop capture.

Moves one or more cursors to the display area. These commands are also available by clicking on the toolbar.

  Moves Trigger Bar, V1Bar  and V2Bar onto the waveform display area.

  Centers waveform display area around V1Bar.

  Centers waveform display area around V2Bar.

  Centers waveform display area around the Trigger Bar.

  Automatic setup parameters for capture.　

When Display is checked, the channel will be displayed on the screen.
When Display is not checked, the channel will not be displayed on the screen. Turning Display off for a channel will speed up the display.        

However the data is still acquired from that channel unless transfer is turned off.

A channel's display can also be set with the buttons on the left edge of the screen. If the channel is on the button will be highlighted.
You can also turn on/off transfer of the data for a channel.

Note: This command applies to both analog and digital channels.

Dots connect off:
   None checking this option will display only the data points of the analog waveform. Logic data is

   unaffected by this option. This is the second fastest display option.

   Note that Lines will always be shown when in Sin (X)/X or Filter Interpolation  

   modes.

Dots connect on:

   Checking this option will display the lines connecting the data points and the data points of the

   analog waveform. Logic data is unaffected by this option. This is the slowest display option.

Note: The lines and dots can be set to different colors.

Turns on or turns off Persistence Mode. In this mode, with each acquisition of data, all previous waveform data remains on the display area. This mode is useful for finding waveform anomalies that occur infrequently. Persistence Mode is also useful for evaluating signal jitter.

Scroll, zoom, change display width, or any update of the screen will erase all of the old data and will initiate a new Persistence Mode capture.

To turn Persistence On, select Persistence from the View Menu. To turn Persistence Off, select Persistence again from the View Menu.

Note: scroll, zoom, change display width, or any update of the screen will erase all of the old data.

See also: View menu, Toolbar, clear button

1.    Connect the scope probe Ground Connection to the BNC GND.
2.    Hold the probe's tip against the calibration point on the BNC center Hole.
3.    A Square wave signal should appear on the screen.
4.    Adjust the probe calibration until a true square wave is shown on the screen, noting the corners

       of the waveform which should be sharp and square, not rounded over or peaky.

This controls the attenuation level for the probe inputs. This should be set to match the probe itself, either 1X, 10X,100X or 1000X. When working with signal amplitudes within ?0 V, either the 1X or the 10X setting can be used. However, if the signal amplitude is outside of ?0 V, use the 10X setting. Note that using the 10X setting with both the probe and the scope even for signals within ?0 V will provide better frequency response through the system due to smaller voltage swings through to the digitizer.. 

Voltage range Probe and probe settings:
5mv/div to 2v/div @probe 1:1

50mv/div to 20v/div @probe 10:1
500mv/div to 200v/div @probe 100:1
5v/div to 2000v/div @probe 1000:1　

The three selections available are AC, DC, and GND couple. In the AC setting, the signal for the selected channel is coupled capacitivity, effectively blocking the DC components of the input signal and filtering out frequencies below 10 Hz. The input impedance is 1MW || 5pF. In the DC setting, all signal frequency components of the signal for the selected channel, are allowed to pass through. The input impedance is 1 MW || 5pF.
In the GND setting, both the input and the A/D converter are connected to ground. Again, the input impedance is 1 MW || 5pF. Use for setting the Ground reference point on the display or if calibrating the DSO board. 

V/Div controls the vertical sensitivity factor in Volts/Division for the selected analog channel. Each V/Div step follows in a 1-2-5 sequence.

To get the best representation of the input signal, set V/Div such that the maximum amplitude swing is displayed on the screen.

This will match the signal amplitude to use most of the digitizer's range, allowing the most bits to be used.
Volts/division can be set via the V/div Combo to Settings.
Volts/Division Probe can be set to 

5mV, 10mV, 20mV, 50mV, 100mV, 200mV, 500mV, 1V, 2V (1:1)

50mV, 100mV, 200mV, 500mV, 1V, 2V, 5V, 10V, 20V (10:1)

500mV, 1V, 2V, 5V, 10V, 20V, 50V, 100V, 200V (100:1)
5V, 10V, 20V, 50V, 100V, 200V, 500V, 1000V, 2000V (1000:1)

This parameter offsets the input signal in relation to the digitizer. This changes the usable input voltage range. The input voltage range is the offset +/- 5 divisions.

Thus if you moved the offset to 1.00V with 1V /division the usable range would be 6.00V to -4.00V. Data outside the input range is clipped and stored as either the max or min input value. The offset references the 0.00V point (GND) for the input channel. 

The ground point is marked on the screen by the Ground Point Tick Marks to the right of the Analog Display. To change the offset in this dialog box, move the elevator button in the scroll bar. The offset can also be changed by  grabbing and moving the appropriate Ground Point Tick Mark in the analog display area.

Automatic measurements on input waveforms can be performed. These include frequency, period, rise time, fall time, min, max, area, .... 
Pulse parameter measurements are performed as specified by ANSI/IEEE std 181-1977 IEEE Standard on Pulse Measurement and Analysis by Objective Techniques.
Up to 10 signal parameters can be measured, tested, and displayed simultaneously. To setup a measurement, select the Measurements (Setup menu) and choose one of the tests to setup (1 to 11)...

area     Sum of all voltages * sample time.
V1Bar (time) position of V1Bar in time.
V2Bar (time) position of V2Bar in time.

H1Bar (voltage) position of H1Bar in voltage.
H2Bar (voltage) position of H2Bar in voltage.
Trigger position of trigger Bar in time.
V1-V2 (time) Time difference between V1Bar and V2Bar.
H1-H2 (voltage) Voltage difference between H1Bar and H2Bar.
V1-trigger (time) Time difference between V1Bar and trigger Bar.
V2-trigger (time) Time difference between V2Bar and trigger Bar.

V_max.     Maximum voltage.
V_min.     Minimum voltage.
V_p-p.     The difference between maximum and minimum voltages.

V_Avg.     Average of minimum and maximum voltages.
rms SQRT   ( (1/ # samples) * ( sum ( (each voltage) * (each voltage) ) ) )
rms (AC) SQRT    ( (1/ # samples) * ( sum ( (each voltage - mean) * (each voltage - mean) ) ) )
Period     Average time for a full cycle for all full cycles in range.
Risetime(10..90)      Average time for a rising transition between the 10% to the 90% points.
Risetime(20..80)      Average time for a rising transition between the 20% to the 80% points.

Falltime(10..90)     Average time for a falling transition between the 10% to the 90% points.
Falltime(20..80)     Average time for a falling transition between the 20% to the 80% points.
Pulse width (positive)     Average width of positive pulses measured at 50% level.

Pulse width (negative)     Average width of negative pulses measured at 50% level.

Frequency     Average frequency of waveform.

The FFT window allows control and display of FFT's.
The following controls are available: 
Window Select the FFT window type: (Triangular, Hanning, Hamming, Blackman-Harris, Rectangular, Wetch and Parzen).
Sample points Select how many points the FFT will sample,  points can't exceed memory depth.
Horizontal zoom Select horizontal zoom ratio.
The FFT routines will process the selected channel starting at V1Bar and continue until "Sample Points" number of points has been reached. If V1Bar is not within the buffer, start of buffer will be used. 

Further information on FFT's can be found in the following sources:
Embedded Systems Programming magazine Volume 3, Number 5, May 1990
Embedded Systems Programming magazine Volume 7, Number 9, Sept. 1994
Embedded Systems Programming magazine Volume 7, Number 10, Oct. 1994
Embedded Systems Programming magazine Volume 8, Number 1, Jan 1995
Embedded Systems Programming magazine Volume 8, Number 2, Feb 1995
Embedded Systems Programming magazine Volume 8, Number 5, May 1995
Circuit Cellar Ink, The Computer Applications Journal Issue 52 Nov 1994
Circuit Cellar Ink, The Computer Applications Journal Issue 61 Aug 1995
Dr. Dobb's Journal Issue 227 Feb. 1995