Instructions for using the SainSmart Mini DSO DS203 pocket-sized oscilloscope (the unauthorized manual)

• Battery-powered, portable, pocket-sized
• Lightweight (2 ounces)
• Full-Color 3" LCD 400x240 display
• 4 channels (two digital - CH C/D, two analog - CH A/B)
• 8MHz Analog Bandwidth
• 72MSps sample rate, 8-bit
• User-upgradeable firmware via USB tethering to include some customization
• Digital storage of data with HOLD for analysis (with memory depth of 4K/channel, 2MB internal USB disk, optionally 8MB) with playback
• Four programmable spaces for user applications, open-source
• 2 Mueller mcx oscilloscope probes included (X1, X10)
• Vertical scale: 20mV-10V/division (using X1 probe)
• Horizontal sensitivity: 0.1µS/division - approximately 1S/division
• Horizontal position: adjustable
• Input coupling: AC/DC
• Input impedance: > 800kΩ
• Max input voltage: 80Vpp (with X1 probe)
• Software trigger type: edge, pulse (auto, normal, single, scan, none)
• Hardware trigger type: edge
• Trigger soure: CH1/CH2/EXT
• Signal generator: 10Hz to 1Mhz (square, sin, sawtooth, triangle) Reported as 10-20K Hz in ElecHouse's manual.
• Auto measure: Vmax (maximum voltage), Vmin (minimum voltage), Vpp (Peak-to-peak voltage), Vavr, Vrms (Average value of voltage), Freq (signal frequency), Period, Pulse, Duty cycle, Vdc (direct current voltage), Vbt, FPS (frames Per Second)
• Current measurement: Level, Voltage
• Display modes: CH1, CH2, EXT, CH1 + CH2, CH1 - CH2, CH1 * CH2
• Sampling mode: realtime
• Sampling rate: 1k - 72M samples/second
• Power: Li-ion battery
• Dimensions: 98mm * 60mm * 14.5mm
• Weight without battery: 80g (shipping weight 1.2lbs)
• Processor: ARM cortex M3 (STM32VCT6) 32-bits with integrated FPGA and high-speed ADC
• Temperature requirements: Operating (0°-50°C), Non-operating (-20° - +60°C)
• Humidity requirements: Operating (10-60% RH), Non-operating (5-60 % RH)
• Max transient-withstanding voltage: +/- 400V peak value
• Max input voltage of logic probe: +/- 15V peak value
• ASIN: B0057M7YLE

From Sainsmart.com's website (PDF, 13 pages)
From ElecHouse.com's website (PDF, 29 pages)

The following controls are broken down by side of the oscilloscope, as held vertically to face the LCD screen. There appear to be short-press and long-press versions of the K1-K4 controls which perform different functions. Note that ElecHouse's button listing on their p5 incorrectly labels CH-A and CH-B locations.

• K1: Also known as PLAY or Run/Hold (this is a momentary-press toggle button)
• K2: Also known as STOP or Calibrate (this is a momentary-press toggle button)
• K3: Also known as RECORD or Preset (this is a momentary-press toggle button, toggling this often brings up a popup display which is sometimes signal details)
• K4: Also known as TRIANGLE or Save Wave (this is a momentary-press toggle button)
• NAV-A: Also known as "-..v..+" or Navigator A (this momentary-press switch can be pushed left or right and the momentary-press middle can be pressed down as a toggle)
• NAV-B: Also known as "<..v..>" or Navigator B (this momentary-press switch can be pushed left or right and the middle can be pressed down)

• WAVE OUT: Signal generator output, mcx-style connector
• CH-B: Analog channel 2, mcx-style connector
• CH-A: Analog channel 1, mcx-style connector

• CH-C: Digital channel 3, mxc-style connector
• CH-D: Digital channel 4, mxc-style connector
• USB port: Mini-USB style (rather than the slightly more popular micro-USB style) connector
• Power switch: standard, sliding switch

The following is a list of menus seen on the LCD screen during operation after the initial splashscreen.

Here, I just indicate what I'm seeing currently on my screen based upon the prior selections I made, noting that yours may show differently. For the top two menus, what is seen in adjacent cells are connected to each other. In other words, "1V" in my case in the second menu row refers to the setting for "AC" which corresponds to the setup for analog CH-A. The same is true for "AC" + "1V" for CH-B. The same is true for digital CH-C which I am currently not displaying ("--"), for example. The last three menu items on the top menu correspond to the last menu item graphic on the second top menu since they go together.

• RUN (This appears to be a status indicator when toggling between displaying an active/changing waveform and displaying a frozen/held waveform for the purpose of measurements.)
• AC (This and the adjacent/lower cell control the analog CH-A input, when toggled indicates DC; however, pressing down toggles to HIDE) The color associated with CH-A is cyan.
• AC (This and the adjacent/lower cell control the analog CH-B input, when toggled indicates DC; however, pressing down toggles to HIDE) The color associated with CH-B is yellow.
• CH(C) (This and the adjacent/lower cell control the digital CH-C input) The color associated with CH-C is purple.
• CH(D) (This and the adjacent/lower cell control the digital CH-D input but additionally shows modes A + B, A - B, C AND D, C OR D, REC A, REC B, REC C, REC D and hide CH-D) The color associated with CH-D is green.
• AUTO (This appears to be the synchronous mode indicator and the adjacent/lower cell indicates the associated value.) The color associated with synchronous mode is brown. (If the trigger mode is turned on, then a horizontal orange line should be present which indicates that this is the threshold point for that trigger.)
• Squ with a small graphic of two cycles of a square wave (the signal generator's output waveform)
• 10KHz (frequency of the signal generator's output waveform)
• DUT 50% (duty cycle of the signal generator's output waveform)

Here, I just indicate what I'm seeing currently on my screen based upon the prior selections I made, noting that yours may show differently.

• Battery charge indicator
• 1V (This sets the value of each grid line's vertical measurement for CH-A. So a one-unit-high waveform in this case would be 1V.)
• 1V
• -- (This indicates that CH-C is currently toggled OFF.)
• --
• 20µS (This sets the value of each grid line's horizontal/time measurement for all channels. So a square wave which occupies one square in the grid would be 20µS across in time in this case.)
• Small graphic of current selection of stored waveform

Here, I just indicate what I'm seeing currently on my screen based upon the prior selections I made, noting that yours may show differently.

• Graphic indicating the current trigger style and channel (I've discovered that if you cycle through the options, it can trigger when the THR (threshold) value is passed by the signal as indicated by the color of this graphic. In other words, choose the blue graphic with an arrow pointing at a down-going edge if you want the standard trigger mode for CH-A.)
• THR The color associated with CH-A is cyan if it is currently selected. (For the Raspberry Pi 3's output PINs this should reasonably be 50% of the 3V expected, say 1.5V or 2V perhaps to make things easier.)
• V1 The color associated with CH-A is cyan if it is currently selected. (Horizontal reference line suitable for measuring ΔV when used with V2.)
• V2 The color associated with CH-A is cyan if it is currently selected.
• T1 The color associated with synchronous mode is brown since this is related. (Vertical reference line suitable for measuring ΔT when used with T2.)
• T2 The color associated with synchronous mode is brown since this is related.
• Y The color associated with CH-A is cyan if it is currently selected. (Used to adjust the entire waveform(s) up and down on the screen above/below 0V.)
• X The color associated with synchronous mode is brown since this is related.
• T0 The color associated with synchronous mode is brown since this is related. (Vertical reference line which indicates the Y-axis.)
• 4K The color associated with synchronous mode is brown since this is related. (Sampling amount, per-channel presumably.)
• EXT The color associated with EXT is white since this is otherwise unrelated to the other color codes seen.

The values seen here are not menu items and may not be selected. These are usually the result of setting up on-screen V1/V2/T1/T2 references to measure signals. Here, I just indicate what I'm seeing currently on my screen based upon the prior selections I made, noting that yours may show differently.

• ΔV: +4.80V The color associated with CH-A is cyan if it is currently selected.
• ΔT: +133 µS The color associated with synchronous mode is brown since this is related.
• Vbt +4.15V The internal battery voltage, as charged

• T: Horizontal line for the trigger voltage associated with either CH-A or CH-B, depending upon its associated color
• 1: The CH-A waveform, if shown. The color associated with CH-A is cyan.
• 2: The CH-B waveform, if shown.  The color associated with CH-B is yellow.
• 3: The CH-C waveform, if shown.  The color associated with CH-C is purple.
• 4: The CH-D waveform, if shown.  The color associated with CH-D is green.
• Unmarked vertical line: The marker associated with the T1 reference, useful for measuring the ΔT of one cycle of the waveform when in the HOLD position, for example
• Unmarked vertical line: The marker associated with the T2 reference, useful for measuring the ΔT of one cycle of the waveform when in the HOLD position, for example
• Unmarked vertical line: The marker associated with the T0 reference
• Unmarked horizontal lines in the background grid pattern: Useful for estimating voltages

Here, I just indicate what I'm seeing currently on my screen based upon the prior selections I made, noting that yours may show differently.

• Vbt +3.98V  (battery voltage). The color associated with this is purple.
• FRQ -----  (signal frequency). The color associated with this is purple.
• CIR 0.000nS  (signal cycle). The color associated with this is purple.
• DUT 0.000%  (duty factor). The color associated with this is purple.
• TH 0.000nS (Monocycle high-level time). The color associated with this is cyan.
• TL 0.000nS  (Monocycle low-level time). The color associated with this is yellow.
• Vpp +200 mV  (peak-to-peak voltage). The color associated with this is cyan.
• Vdc +160 mV  (direct current voltage). The color associated with this is cyan.

• Save Param (Use NAV-B to select this option and then PUSH NAV-A to perform this function)
• Save Dat
• Save Buf
• Save Bmp
• Save Csv
• Load Dat
• Load Buf
• BackLight (Use NAV-B to select this option then left/right on NAV-A to change)
• Buzzer (Volume control: Use NAV-B to select this option then left/right on NAV-A to change)
• Standby (Minutes until screen is blacked, similar selection as above)
• Calibrat

Donate		Cryptocurrency
Ethereum		Bitcoin