DSO-138-Mini - Measuring equipment Joy-It - Free user manual and instructions
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| Product Type | Digital Oscilloscope |
| Model | DSO-138-Mini |
| Brand | Joy-It |
| Category | Measuring Equipment |
| Display | 2.4-inch TFT LCD (320x240 pixels) |
| Bandwidth | 200 kHz |
| Sampling Rate | 1 MS/s |
| Input Impedance | 1 MΩ |
| Input Voltage Range | 50 mV/div to 5 V/div (1x probe) |
| Timebase Range | 10 μs/div to 500 ms/div |
| Power Supply | 5 V DC via USB (Micro-B) |
| Battery | Internal lithium-ion battery (3.7 V, 1200 mAh) |
| Dimensions (W x H x D) | 105 x 62 x 18 mm |
| Weight | 98 g |
| Functions | Auto measurement, trigger (rising/falling edge), waveform freeze, cursor readout |
| Maintenance and Cleaning | Wipe with a soft, dry cloth; do not use solvents or water. |
| Safety | Use only the provided USB cable and power adapter; do not open the case; avoid input voltages above 40 V (1x probe). |
| Spare Parts and Repairability | Replacement probes and USB cables available from Joy-It; the device is not user-serviceable. |
| General Information | Pre-assembled oscilloscope suitable for educational and hobby use. |
Frequently Asked Questions - DSO-138-Mini Joy-It
How do I power on the DSO-138-Mini?
Press and hold the power button for 2 seconds. The device will boot and display the waveform screen.
Can I use a 9V battery to power it?
No, the DSO-138-Mini requires a 5V DC input via its Micro-USB port. Using a higher voltage may damage the device.
How do I calibrate the oscilloscope?
Connect the probe to the built-in 1 kHz square wave test point (usually labeled TP). Adjust the probe's compensation capacitor until the wave appears square.
What is the maximum input voltage?
With a 1x probe, the maximum safe input is 40 V peak. For higher voltages, use a 10x probe (up to 400 V).
Why is my waveform not stable?
Adjust the trigger level using the TRIG knob. Also ensure the timebase is set appropriately for your signal frequency.
Can I save waveforms?
Yes, press the SAVE button to freeze the current waveform on screen. It remains until you press RUN again.
How do I update the firmware?
Firmware updates are not officially supported. The device comes with the latest stable firmware from Joy-It.
What does the battery indicator mean?
The battery icon on the top-right shows remaining charge. When empty, recharge via USB within 3-4 hours.
Is the DSO-138-Mini a kit?
No, it comes fully assembled. However, the original DSO-138 is a DIY kit; this Mini is a pre-built version.
Where can I find the user manual?
The manual is available for free download on notice-facile.com in multiple languages. You can also request a translated version via email.
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USER MANUAL DSO-138-Mini Joy-It
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Product information
Brand : Joy-It
Model : DSO-138-Mini
Category : Measuring equipment