Gabotronics

Mixed Signal Oscilloscope

Specifications

• 2 Analog Inputs
• Input Impedance: 1M?
• Maximum Input Voltage: +/- 25V
• (+/- 250V if using a 10:1 probe)
• A/D Converter Resolution: 8 bits
• Max Sample Rate: 16MS/s
• 4 Digital Inputs: 3.3V level

Features:

Time Base (S/division):

1u

2u

5u

10u

20u

50u

100u

200u

500u

1m

2m

5m

10m

20m

50m

0.1

0.2

0.5

1

2

5

10

20

50

Gain (Volts / division):

20m

50m

0.1

0.2

0.5

1

2

5

• Horizontal Cursors
• Vertical Cursors
• Automatic Average and Peak to Peak measurements
• FFT and automatic search of fundamental frequency
• Export to BMP through RS-232 using HyperTerminal
• Save screenshots and data on the SD card
• Analog trigger and external digital trigger
• One time division consists of 16 pixels. Example: 5uS / division = 5uS / 16 pixels ==> 312.5nS / pixel
• One gain division consists of 16 pixels

User Interface

The '*' Key exits from the current menu. If the current menu is the default menu, the '*' Key exits the MSO application.
The '#' Key shows a Help Screen.
If the '#' Key is pressed on the Help Screen, the oscilloscope will auto set the gain and sampling rate depending on the applied signals.
If the '*' Key is pressed on the Help Screen, the AWG can be controlled.

The numbers on the keypad select each menu:

1 Channel 1 Menu	2 Channel 2 Menu	3 Digital Input Menu
4 Trigger Type	5 Cursor Menu	6 Spectrum Analyzer
7 Trigger Source	8 Storage Menu	9 Voltmeter Menu
* AWG Control	0 Display Menu	# Auto Setup

Buttons KA thru KE select the function shown on the current menu at the bottom of the LCD. If there is no menu shown, then the default menu is active.

	KA	KB	KC	KD	KE	Encoder 1	Encoder 2
default	Run / Stop	MSO	FFT	Meter	X-Y	Horizontal Position	Sampling Rate
1: Channel 1 Menu	Channel on/off	Invert Channel	Probe X1/X10	Average Samples	CH1+CH2	CH1 position	CH1 gain
2: Channel 2 Menu	Channel on/off	Invert Channel	Probe X1/X10	Average Samples	CH1*CH2	CH2 position	CH2 gain
3: Digital Input	Digital on/off	Invert Channel	Thick Low	Serial Hex Display	Parallel Hex Display	Digital Position	Digital Size
4: Trigger Type	Force Trigger	Free	Normal	Single	Auto	Trigger Delay	Trigger Timeout
5: Cursor Menu	Reference Waveforms	Lock Auto Set	Vertical Cursors	CH1 Horizontal Cursors	CH2 Horizontal Cursors	Cursor 1	Cursor 2
6: Spectrum Analyzer	Apply Logarithm	Hamming Window	Hann Window	Cosine Window	Triangle Window	Horizontal Position	Sampling Rate
7: Trigger Source	CH1	CH2	External Trigger	DAC	Digital Inputs	Trigger H Position	Trigger Level
8: Storage Menu	Save BMP data to SD	Save CSV data to SD	Save WFM data to SD	Load WFM data from SD	Erase WFM data from SD
9: Voltmeter Menu	Auto Setup	VAC	VDC	RMS	Restart
0: Display Menu	Persistent Mode	Line / Dot	Show Gain/Rate settings	Change Grid type	Backlight on/off
* : AWG Control	Sine	Square	Triangle	Exponential	Toggle Encoder	Frequency / offset	Amplitude / Duty Cycle

 

Detailed Function Description

 

Default Menu

KA: Run / Stop	KB: MSO	KC: FFT	KD: Meter	KE: XY Mode
Starts or stops the data acquisition	Sets the MSO mode	Sets the Spectrum Analyzer	Sets the Meter mode	Sets the X-Y Mode

Menu 1: Channel 1

KA: CH1ON	KB: INVERT	KC: X10	KD: AVRG	KE: CH1+CH2
Toggles channel 1 on and off	Inverts the channel	Toggles between X1 probe or X10 probe	Toggles between averaging on and off	CH1 trace is replaced with CH1+CH2

Menu 2: Channel 2

KA: CH2ON	KB: INVERT	KC: X10	KD: AVRG	KE: CH1xCH2
Toggles channel 2 on and off	Inverts the channel	Toggles between X1 probe or X10 probe	Toggles between averaging on and off	CH1 trace is replaced with CH1xCH2

Menu 3: Digital Input

KA: CH2ON	KB: INVERT	KC: THCK0	KD: HEXS	KE: HEXP
Toggles logic on and off	Inverts the logic	Thick or thin line when the input is low	Shows the serial decoding	Shows the parallel decoding

Serial Hex Display: Shows the hexadecimal value of the stream of bits on each channel. The decoding starts at the first vertical cursor and ends at the second vertical cursor, 8 bits are decoded.

Parallel Hex Display: Shows the hexadecimal value of the 4 bit digital input lines.

 

Menu 4: Trigger Type

KA: Force Trigger: Pressing the KA button will force a trigger.

KB: Free: The MSO trigger is free running, a new trace will be drawn when the last one ends.

KC: Normal: Trace when a trigger occurs

KD: Single: Trace once when a trigger occurs

KE: Auto: Trace when a trigger occurs, or when the trigger timeout is reached.

 

Menu 5: Cursors

KA: Reference Waveforms: A snapshot is taken of the analog waveforms to be used as reference waveforms.

KB: Lock Auto Set: The cursors are automatically set continuously in MSO and FFT modes

KC: Vertical Cursors: Toggles vertical cursors on and off.

KD: CH1 Horizontal Cursors: Toggles CH1 horizontal cursors on and off.

KE: CH2 Horizontal Cursors: Toggles CH2 horizontal cursors on and off.

 

Menu 6: Spectrum Analyzer

KA: Apply Logarithm: Apply Logarithm to the FFT

KB: Hamming Window: A Hamming window is used on the FFT.

KC: Hann Window: A Hann window is used on the FFT.

KD: Cosine Window: A Cosine window is used on the FFT.

KE: Triangle Window: A Triangle window is used on the FFT.

 

Menu 7: Trigger Source

KA: CH1: Select CH1 as the trigger source.

KB: CH2: Select CH2 as the trigger source.

KC: External Trigger: Select the external trigger input as the trigger source.

KD: DAC: Select the internal DAC as the trigger source.

KE: Digital Inputs: Select a digital input as the trigger source. Pressing KE will cycle thru all the different digital inputs.

 

Menu 8: Storage

KA: Save BMP screen to SD: A screen shot will be saved in a new file in BMP format.

KB: Save CSV data to SD: Save data to a new file in the SD in CSV format.

KC: Save WFM data to SD: Save data and settings to a new file in the SD in WFM format (internal binary format).

KD: Load WFM data from SD: Data will be loaded from an WFM file. Pressing the KE button will cycle thru all the saved WFM files.

KE: Erase WFM data from SD: The last loaded WFM file will be erased.

Each file format has 1000 available slots, named GT000.ext thru GT999.ext, ext is the extension (BMP, CSV or WFM)

 

Menu 9: Voltmeter

KA: Auto Setup: Toggles the automatic setup. When enabled, the device will continuously adjust the gain, sampling rate and trigger levels.

KB: VAC: Calculates the DC component of the voltage.

KC: VDC: Calculates the AC component of the voltage.

KD: RMS: Calculates the RMS, which is SQRT (AC²+DC²).

KE: Restart: Restarts the time counter, minimum value, maximum value and the cumulative moving average.

Menu 0: Display Options

KA: PRSTENT	KB: LINE	KC: SHOW	KD: GRID	KE: BKLITE
Sets persistent mode	Selects line or dot display	Display gain and sampling rate	Selects the grid type	Toggles the backlight on and off

TIPS:

Persistent Mode: The persistent display is useful as a simple data logger or to catch glitches in the waveform.
The persistent mode can also be used to make frequency plots by varying the frequency of the input signal.

Dot dispay: The dot display is useful at slow sampling rates or when used in combination with the persistent mode.

 

Menu * : AWG Control

KA: Sine: Selects a sine wave for the AWG.

KB: Square: Selects a square wave for the AWG.

KC: Triangle: Selects a triangle wave for the AWG.

KD: Exponential: Selects an exponential wave for the AWG.

KE: Change Encoders:Toggles Encoders control from ( Frequency / Amplitude ) or ( Offset / Duty Cycle ).

 

 BMP Screen Capture