1. Introduction
The GW Instek GDS-1202B is a 200 MHz, 2-channel digital storage oscilloscope designed for precise measurement and analysis of electronic signals. This instrument features a 256-color gradient display, 1GSa/s maximum sampling rate, and 10Mpts memory depth per channel, making it suitable for a wide range of applications from educational settings to fundamental R&D in industrial sectors. Its compact design and comprehensive functionalities provide an efficient solution for complex measurement challenges.
Key features include:
- 200MHz, 2 Channels DSO
- 1GSa/s maximum sampling rate
- 10M maximum memory depth for each channel
- 7" 800 x 480 WVGA LCD display
- 256 color gradient display function to strengthen waveform performance
2. Product Overview
This section provides an overview of the GDS-1202B oscilloscope's physical components and controls.
Figure 2.1: Front view of the GW Instek GDS-1202B Digital Storage Oscilloscope, showing the display, control panel, and input ports.
2.1 Front Panel Controls
The front panel of the GDS-1202B is organized into several functional areas:
- Display Area: 7-inch WVGA LCD for waveform display and menu navigation.
- Vertical Controls: Knobs and buttons for adjusting vertical position, scale, and input coupling for CH1 and CH2.
- Horizontal Controls: Knobs and buttons for adjusting horizontal position, scale, and zoom.
- Trigger Controls: Adjust trigger level, mode, and source.
- Function Buttons: Buttons for Measure, Cursor, APP, Acquire, Display, Help, Save/Recall, Utility, Autoset, Run/Stop, Single, Default, and Menu.
- Input Connectors: BNC connectors for CH1, CH2, and EXT TRIG. USB ports for data storage and communication.
- Power Button: Located on the lower left for turning the device on/off.
3. Setup and Installation
Follow these steps to set up your GDS-1202B oscilloscope:
- Unpacking: Carefully remove the oscilloscope and all accessories from the packaging. Verify that all components listed in the packing list are present.
- Power Connection: Connect the supplied power cord to the AC input on the rear panel of the oscilloscope and then to a grounded AC power outlet. Ensure the voltage matches the oscilloscope's requirements.
- Initial Power On: Press the POWER button on the front panel. The oscilloscope will perform a self-test and display the GW Instek logo before showing the main waveform interface.
- Probe Connection: Connect the oscilloscope probes to the CH1 and/or CH2 BNC input connectors. Ensure a secure connection by twisting the probe connector clockwise until it locks.
- Probe Compensation: Before taking measurements, it is recommended to compensate the probes to ensure accurate readings. Connect the probe tip to the probe compensation output (usually a square wave test point on the front panel) and adjust the probe's compensation trimmer until a flat-top square wave is displayed on the screen.
4. Operating Instructions
This section details the basic operation of the GDS-1202B oscilloscope.
4.1 Basic Waveform Display
- Autoset: Press the Autoset button to automatically adjust the vertical, horizontal, and trigger settings to display a stable waveform.
- Vertical Scale (VOLTS/DIV): Use the SCALE knob in the VERTICAL section to adjust the vertical sensitivity (volts per division) for each channel.
- Vertical Position: Use the POSITION knob in the VERTICAL section to move the waveform vertically on the screen.
- Horizontal Scale (SEC/DIV): Use the SCALE knob in the HORIZONTAL section to adjust the time base (seconds per division).
- Horizontal Position: Use the POSITION knob in the HORIZONTAL section to move the waveform horizontally.
4.2 Triggering
Triggering stabilizes repetitive waveforms and captures single-shot events.
- Trigger Level: Use the TRIGGER LEVEL knob to set the voltage level at which the oscilloscope triggers.
- Trigger Menu: Press the Menu button in the TRIGGER section to access trigger settings such as mode (Auto, Normal, Single), source (CH1, CH2, EXT, AC Line), and slope (rising, falling, both).
- Single Shot: Press the Single button to capture a single waveform event when the trigger conditions are met.
4.3 Measurement Functions
The GDS-1202B offers various automatic measurement functions.
- Measure Button: Press the Measure button to display a menu of automatic measurements (e.g., Vpp, Vmax, Vmin, Freq, Period, Rise Time, Fall Time). Select desired measurements to display them on the screen.
- Cursor Button: Press the Cursor button to activate cursors for manual measurement of voltage and time differences. Use the VARIABLE knob to position the cursors.
4.4 Saving and Recalling Settings/Waveforms
The oscilloscope allows saving and recalling instrument settings and waveform data.
- Save/Recall Button: Press the Save/Recall button to access options for saving waveforms to internal memory or a USB drive, and recalling previously saved settings.
- USB Storage: Insert a USB flash drive into the front panel USB port to save screenshots (BMP, PNG), waveform data (CSV), or instrument settings.
5. Maintenance
Proper maintenance ensures the longevity and accuracy of your GDS-1202B oscilloscope.
- Cleaning:
- Disconnect the power cord before cleaning.
- Use a soft, damp cloth with mild detergent to clean the exterior of the instrument.
- Do not use abrasive cleaners or solvents that may damage the plastic parts or display.
- For the display, use a soft, lint-free cloth specifically designed for LCD screens.
- Storage: Store the oscilloscope in a clean, dry environment away from direct sunlight, extreme temperatures, and high humidity.
- Probe Care: Handle probes carefully. Avoid bending or stressing the probe cables. Store probes properly to prevent damage to the tips and connectors.
- Calibration: Regular calibration by qualified personnel is recommended to maintain measurement accuracy, especially for critical applications. Refer to the GW Instek service center for calibration services.
6. Troubleshooting
This section provides solutions to common issues you might encounter.
| Problem | Possible Cause | Solution |
|---|---|---|
| No display after power on. | Power cord not connected or power outlet issue. | Check power cord connection. Verify power outlet is functional. |
| No waveform displayed. | Probe not connected, input signal too small/large, or incorrect settings. | Ensure probe is connected to input and signal source. Press Autoset. Adjust VOLTS/DIV and SEC/DIV. Check trigger settings. |
| Waveform is unstable or rolling. | Incorrect trigger level or mode. | Adjust TRIGGER LEVEL. Set trigger mode to Auto or Normal. Ensure trigger source matches input channel. |
| Measurements are inaccurate. | Probe compensation incorrect or uncalibrated. | Perform probe compensation. Consider professional calibration if issue persists. |
7. Specifications
Detailed technical specifications for the GW Instek GDS-1202B Digital Storage Oscilloscope.
| Parameter | Value |
|---|---|
| Model Number | GDS-1202B |
| Bandwidth | 200 MHz |
| Channels | 2 |
| Max. Real-time Sample Rate | 1 GSa/s (single channel) |
| Memory Depth | 10 Mpts/channel |
| Display | 7-inch 800 x 480 WVGA LCD |
| Waveform Update Rate | 50,000 wfms/s |
| Product Dimensions | 1 x 1 x 1 inches |
| Item Weight | 10.64 Pounds |
| Manufacturer | INSTEK AMERICA CORP |
8. Warranty and Support
GW Instek products are designed for reliability and performance. For warranty information and technical support, please refer to the official GW Instek website or contact their authorized service centers.
- Warranty: Please refer to the warranty card included with your product or visit the GW Instek official website for detailed warranty terms and conditions.
- Technical Support: For technical assistance, troubleshooting, or service inquiries, contact GW Instek customer support or your local distributor.
- Online Resources: Additional resources, including software updates, FAQs, and application notes, may be available on the GW Instek website.
