1. Introduction
The HTOOL SL22 is a modern signal source solution designed for high precision, low phase noise, and portability. It is specifically engineered to meet the demanding testing and application requirements across research and development, production, and educational sectors. The core design focuses on delivering pure, stable, and highly controllable signals, while simultaneously streamlining operational procedures and enhancing work efficiency through intelligent control mechanisms.
This device offers an exceptionally broad frequency coverage, ranging from 45 MHz to 22.6 GHz, and achieves a high frequency resolution of 1 kHz. This ensures precise targeting and output of desired frequency points. Its outstanding ultra-low phase noise performance of -236 dBc/Hz provides a robust foundation for applications such as high-sensitivity receiver testing and high-quality local oscillator simulations. Featuring dual-channel independent output and supporting both point frequency and sweep frequency modes, the HTOOL SL22 is highly adaptable to various complex signal scenarios.
Figure 1: HTOOL SL22 Signal Generator with device information displayed.
2. Package Contents and Physical Overview
2.1 Package Contents
The HTOOL SL22 Signal Generator comes with the following accessories:
- 1x HTOOL SL22 Signal Generator Unit
- 1x Type-C USB Cable
- 5x Adapters (various types)
- 2x SMA RF Cables
- 1x Stylus
Figure 2: HTOOL SL22 Signal Generator and included accessories.
2.2 Physical Overview and Dimensions
The HTOOL SL22 features a compact design with two SMA output interfaces (Channel 1 and Channel 2) on one side, and a Type-C power connector and an ON/OFF switch on the other side. The device also includes heat dissipation holes for optimal performance.
Figure 3: Dimensions of the HTOOL SL22 Signal Generator.
- Dimensions: 13.3 cm (5.24 in) x 7.5 cm (2.95 in) x 2.2 cm (0.86 in)
- Weight: 200g
Figure 4: Location of heat dissipation holes on the HTOOL SL22.
3. Operating Instructions
The HTOOL SL22 can be operated directly via its onboard interface (Lower Machine) or controlled via PC software (Upper Machine).
3.1 Onboard Interface (Lower Machine)
The device features four main buttons for navigation and mode selection: POINT, SINGLE SWEEP, CYCLIC SWEEP, and DEVICE.
Figure 5: HTOOL SL22 Onboard Interface.
3.1.1 Button Functions
- POINT: Short press to enter the Point Frequency setting interface.
- SINGLE SWEEP: Short press to enter the Single Sweep setting interface.
- CYCLIC SWEEP: Short press to enter the Cyclic Sweep setting interface.
- DEVICE: Short press to enter the Device Information interface.
3.1.2 Operating Modes
The following modes are available on the device's display:
- Point Frequency Mode:
- Tap the 'Set' button to configure the desired single frequency (in MHz).
- Slide the switch to the right to turn the signal source ON, and to the left to turn it OFF.
- Default precision is 0.001 MHz.
- Frequency range: 45 MHz - 22600 MHz.
Figure 6: Point Frequency Mode display.
- Single Sweep Mode:
- Set the Start Frequency, End Frequency, Step, and Step Time.
- Slide the switch to turn the signal source ON/OFF. The signal source will automatically turn off after a single sweep is completed.
Figure 7: Single Sweep Mode display.
- Cyclic Sweep Mode:
- Set the Start Frequency, End Frequency, Step, and Step Time.
- Slide the switch to turn the signal source ON/OFF.
Figure 8: Cyclic Sweep Mode display.
- Device Information Interface:
- Language: Select Chinese, English, or Russian. Changes require a screen refresh (e.g., by pressing any of the four main buttons).
- Power: Adjust output signal power from P0 (lowest) to P7 (highest).
- Displays Device Type (SL22), Frequency Range (45 MHz - 22600 MHz), Version (e.g., V2.1.5), ID (e.g., 0F875015), and Web address (https://www.htool.net.cn/).
Figure 9: Device Information display.
3.2 PC Software (Upper Machine)
The HTOOL SL22 can be controlled via dedicated PC software, connecting through a USB Type-C cable.
3.2.1 Connection
- Connect the HTOOL SL22 to your PC using the provided Type-C USB cable.
- In the PC software, locate the