HTOOL SL22

Contents

HTOOL LMX2820 SL22 RF Signal Source User Manual

Model: SL22

1. Introduction

The HTOOL LMX2820 SL22 is a versatile RF Signal Source designed for generating swept high-frequency and low-frequency sine wave signals. It features an LMX2820 chip, a GD32F427 main control, and a 2.8-inch (240*320) LCD screen for intuitive operation. The device supports USB virtual serial port communication, requiring driver installation for PC connectivity.

HTOOL SL22 RF Signal Source overview, highlighting modes (Point, Single Sweep, Cyclic Sweep), multi-language support, power range, and frequency range.
Figure 1: HTOOL SL22 RF Signal Source overview, highlighting modes and key features.

This signal generator is widely applicable in various fields including electric power, communications, meteorology, railways, oil fields, construction, measurement, scientific research, and teaching units, as well as industrial and mining enterprises.

Applications of the signal generator in various fields like meteorology, industrial, scientific research, power communications, electricity metering, and railroad circuits.
Figure 2: Wide range of applications for the SL22 Signal Generator.

2. Product Features

  • Generates sine waves from 45MHz to 22600MHz.
  • High frequency resolution of 1KHz.
  • Very low phase noise: -236dBc/Hz.
  • Dual-channel signal output (Channel 1 and Channel 2) with 8 amplitude levels (P0 to P7), covering an amplitude range of -16 to 7dBm.
  • Supports both swept frequency and point frequency working modes.
  • Built-in USB virtual serial port for communication.
  • Supports serial port control for frequency sweeping, point frequency, and other operations.
  • Powered via USB.
  • Features power-down memory, retaining the last set point frequency or cyclic sweep frequency upon restart.

3. Package Contents

The HTOOL SL22 RF Signal Source package includes the following items:

Product List showing the SL22 device, two SMA Male-to-Male RF cables, a Type-C cable, a stylus pen, and various adapters.
Figure 3: Contents of the HTOOL SL22 package.
  • 1 x HTOOL SL22 RF Signal Source
  • 2 x SMA Male-to-Male RF Cables
  • 1 x Type-C USB Cable
  • 1 x Stylus Pen
  • 1 x SMA Female to Female Adapter
  • 1 x N-Female (Hole) to SMA Male (Pin) Adapter
  • 1 x BNC Female (Hole) to SMA Male (Pin) Adapter
  • 1 x SMA Male (Pin) to F Female (Hole) Adapter
  • 1 x SMA Male to BNC Male Adapter
Video 1: Product unboxing and overview of the HTOOL SL22 RF Signal Source and its accessories.

4. Specifications

Table of Product Technical Parameters for the SL22.
Figure 4: Product Technical Parameters.
ParameterValue
Product ModelSL22
FunctionSignal generators
Frequency Range (CH1, CH2)45MHz ~ 22GHz
Power RangeP0 ~ P7: -16dBm ~ 7dBm
Frequency Accuracy1KHz
Sweep Width45MHz ~ 22GHz
Sweep StepMinimum 1KHz, Maximum 22555MHz
Sweep Time1ms ~ 10s
Output SignalSinusoid
Output InterfaceSMA
Power ConnectorTYPE-C
Product Dimensions132 * 74 * 22mm
Dimensions of the SL22 device: 13.3cm/5.24in length, 7.5cm/2.95in width, 2.2cm/0.86in height, with Type-C port and ON/OFF switch.
Figure 5: Physical dimensions and port layout of the SL22.
Product details showing heat dissipation holes (3 views), dual-channel signal output, USB power delivery support, front view, and side view.
Figure 6: Detailed views of the SL22, highlighting heat dissipation, dual-channel output, and USB power.

5. Setup

  1. Power Supply: Connect the device to a 5V, 2A or above power adapter using the provided Type-C USB cable.
  2. Driver Installation (for USB Communication): If you intend to use the USB virtual serial port for communication with a PC, ensure the necessary drivers are installed on your computer. Refer to the manufacturer's website or included software for driver downloads and installation instructions.
  3. Connecting RF Cables: Connect the SMA Male-to-Male RF cables to the CH1 and CH2 SMA bores on the device as needed for your application. Use the provided adapters if different connector types are required.
Detailed view of the SL22 device, showing front and back, including CH1 and CH2 SMA bores.
Figure 7: Rear view of the SL22 showing Channel 1 (CH1) and Channel 2 (CH2) SMA bores.

6. Operation

The SL22 offers two primary operating modes: Point Frequency Mode and Sweep Mode. Navigation and settings are managed via the LCD screen and physical buttons.

User interface menu showing options for Point, Single Sweep, Cyclic Sweep, and Device settings.
Figure 8: Main menu interface of the SL22.

6.1. Point Frequency Mode

In Point Frequency Mode, the output signal frequency is fixed and does not change over time, functioning as a fixed sine wave signal.

  1. Accessing Mode: You can enter Point Frequency Mode either by using a dedicated key shortcut or by selecting 'Point' from the on-screen menu.
  2. Frequency Control:
    • Click the "Set" button on the screen.
    • Enter your desired frequency point using the input interface.
    • Activate the "switch" to initiate the point frequency output.
  3. Power Control:
    • Navigate to the "Device" interface.
    • Select the desired power level from the "Power" drop-down box to control the output amplitude.
Explanations of Point Frequency Mode Output and Swept Mode Output.
Figure 9: Description of Point Frequency Mode Output.

6.2. Sweep Mode

In Sweep Mode, the frequency of the output signal changes over time, generating a signal with a varying frequency. This mode includes both single frequency sweep and cyclic frequency sweep options.

  1. Accessing Mode: Enter Sweep Mode via a key shortcut or by selecting 'Single Sweep' or 'Cyclic Sweep' from the on-screen menu.
  2. Setting Parameters: This function requires setting the following parameters:
    • Start Frequency: The initial frequency of the sweep.
    • End Frequency: The final frequency of the sweep.
    • Time: The duration of the sweep.
    • Step Size: The increment or decrement of frequency during the sweep.
  3. Power Control: Similar to Point Frequency Mode, navigate to the "Device" interface and select the desired power level from the "Power" drop-down box.

Important Note for Sweep Mode:

If the start frequency is greater than or equal to the end frequency, the sweep operation will not be performed. Additionally, setting the step size too large or the interval time too small may result in slow or no execution. Always review the start and end frequencies, step size, and single-step time before enabling the sweep function.

7. Maintenance

  • Cleaning: Use a soft, dry cloth to clean the device. Avoid using abrasive cleaners or solvents that could damage the casing or screen.
  • Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
  • Handling: Handle the device with care to prevent physical damage. Avoid dropping or subjecting it to strong impacts.
  • Software Updates: Periodically check the HTOOL official website for any firmware or software updates for the LMX2820 SL22 to ensure optimal performance and access to new features.

8. Troubleshooting

  • Device Not Powering On:
    • Ensure the Type-C cable is securely connected to both the device and a 5V, 2A or above power adapter.
    • Verify the power adapter is functioning correctly.
    • Check the ON/OFF switch on the device.
  • No Signal Output:
    • Confirm that the RF cables are properly connected to the SMA bores and the receiving equipment.
    • In Point Frequency Mode, ensure the "switch" is enabled after setting the frequency.
    • In Sweep Mode, double-check that the start and end frequencies, sweep time, and step size are configured correctly and that the enable switch is on.
    • Verify the power level setting in the "Device" interface.
  • USB Communication Issues:
    • Ensure the USB virtual serial port drivers are correctly installed on your computer.
    • Try a different USB port or cable.
    • Restart both the device and your computer.
  • Screen Unresponsive:
    • Use the provided stylus pen for precise input.
    • If the screen remains unresponsive, try restarting the device.

9. User Tips

  • For stable operation, always use a power adapter that provides at least 5V and 2A.
  • When performing frequency sweeps, carefully set the start and end frequencies, sweep time, and step size to avoid unexpected behavior or non-execution.
  • Keep the device's firmware updated to benefit from performance improvements and bug fixes.
  • Utilize the power-down memory feature to quickly resume your last used frequency settings.

10. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the official HTOOL website or contact your point of purchase. Keep your purchase receipt as proof of purchase for warranty claims.

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