Mixed Signal Oscilloscope
1 Analog Input
|Time Base (S/division):||5u||10u||20u||50u||100u||200u||500u||1m||2m|
|Gain (Volts / division):||20m||50m||0.1||0.2||0.5||1||2||5|
Automatic Average and Peak to Peak measurements
FFT and automatic search of fundamental frequency
Export to BMP through RS-232 using HyperTerminal
One time division consists of 16 pixels.
Example: 5uS / division = 5uS / 16 pixels ==> 312.5nS / pixel
One gain division consists of 16 pixels
Analog trigger and external digital trigger
K1: Set rotary encoders to control Gain and Rate.
K2: Set rotary encoders to control horizontal cursors,
Toggles horizontal cursors on and off.
K3: Set rotary encoders to control vertical cursors,Toggles vertical cursors on and off..
|K4: Toggle Math Function on and off:|
In normal mode:
Displays the Average (DC) & Peak to Peak voltage (PP) of the waveform
In FFT mode:
Displays the fundamental frequency of the waveform
|K5: Toggles between FFT mode and scope mode.
K6: Digital inputs control, K6 cycles between these modes:
The trigger will occur on the rising edge of the pulse.
K7: Sets the rotary encoders for trigger control
Rotary Encoder 1: Sets the trigger level
Rotary Encoder 2: Sets the trigger mode:
Once in trigger control, the behavior of K7 also changes:
NOTE: Keys K1 thru K6 are disabled when the scope is waiting for the trigger (NORMAL modes). If the scope doesn't have a signal that continuously triggers the scope, K1-K6 will not respond. This is a necessary behavior since the trigger is detected by software, keys K1 thru K6 are checked continuously using the AVR's ADC and would add trigger jitter if left enabled. Key K7 and rotary encoders are never disabled.
WORKAROUND to enable K1-K6 at the absence of a trigger:
|K1 and K2: Toggle between:
TIP: The persistent display is useful as a data logger or to catch glitches in the waveform
|K2 and K3: Toggle between:
TIP: The dot display is useful at slow sampling rates or when used in combination with the persistent mode.
|K3 and K4: Change between different grid types:|
|K4 and K5: Toggle between:
The Hamming window is useful when the number of cycles of the waveform is not an integer. Example:
|K3 and K5: Toggle between:
The log is useful when analyzing low level components on the signal. When analyzing audio, it is also very useful as it maps more directly to how humans perceive sound. Example:
K1 and K3: Toggle between:
- Show Gain and Rate settings
- Don't show Gain and Rate settings
K2 and K4: Automatic offset calibration. Make sure the input is connected to ground.
K1 and K5: exit Scope
AC/DC/GND Jumper: Selects the different input coupling options:
Analog gain and frequency compensation adjustments
The MultiKitB is calibrated during assembly, but if you require to adjust it, follow this procedure: Apply a squarewave with a known amplitude (or use a meter to measure it). Adjust pot R33 until the voltage is correct. Adjust trimmer C19 until the waveform is a squarewave.
|Over compensated||Under compensated||Compensated ok|
To send a BMP screen capture to a PC:
You can send a screen capture of the oscilloscope to your PC using hyperterminal. All oscilloscope bitmaps in this manual where generated using this method.
- Open HyperTerminal.
- Enter a name for a new connection (example: multikit).
- Enter the COM port where the MultiKit is connected.
- Select 19200 bits per second, 8 data bits, Parity None, 1 Stop bit, Flow control None
- In the Transfer menu, select Receive File.
- Enter a folder where to save the file and use the XMODEM protocol.
- Enter a file name with a BMP extension and press OK