USG-LF44 - Generator GW Instek - Free user manual and instructions
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| Product Type | Low-Frequency Signal Generator |
| Brand | GW Instek |
| Model | USG-LF44 |
| Frequency Range | 0.1 Hz to 4 MHz |
| Output Waveforms | Sine, Square, Triangle, Ramp, Pulse, Noise |
| Output Amplitude | 0 to 10 Vp-p into 50 Ω |
| Display | 4-digit LED with frequency and amplitude readout |
| Modulation | AM, FM, Sweep, Burst |
| Power Supply | 100-240 VAC, 50/60 Hz, 30 VA |
| Dimensions (W x H x D) | 265 x 105 x 285 mm |
| Weight | 2.5 kg (5.5 lbs) |
| Output Impedance | 50 Ω (fixed) |
| Harmonic Distortion | < 0.1% typ. at 1 kHz, sine |
| Storage Temperature | -20°C to +70°C |
| Operating Temperature | 0°C to +50°C |
| Maintenance | Clean with dry cloth; avoid liquids |
| Safety | Complies with EN 61010-1; use only supplied power cord |
| Accessories Included | Power cord, BNC test lead, user manual |
| Warranty | 3 years |
| Spare Parts Availability | Contact GW Instek service centers for replacement fuses, knobs, and feet |
| Reparability | Repair by qualified technicians only; internal adjustments may require calibration |
Frequently Asked Questions - USG-LF44 GW Instek
How do I set the output frequency on the GW Instek USG-LF44?
Use the Frequency knob to adjust the coarse and fine values. The display shows the current frequency. Press the Units button to cycle through Hz, kHz, and MHz.
What is the maximum output amplitude?
The maximum amplitude is 10 Vp-p into a 50 Ω load. For high-impedance loads, the voltage may double. Use the Amplitude knob to adjust from 0 to 10 Vp-p.
Can I generate a DC offset?
Yes, the USG-LF44 includes a DC Offset function. Press the Offset key and adjust the knob to set a DC level between -5 V and +5 V (into 50 Ω).
How do I select a different waveform?
Press the Waveform button repeatedly to cycle through Sine, Square, Triangle, Ramp, Pulse, and Noise. The selected waveform is shown on the display.
How do I use the sweep function?
Press the Sweep key to enter sweep mode. Use the knobs to set start and stop frequencies, sweep time, and trigger mode. The generator outputs a frequency sweep from start to stop.
What is the output impedance and do I need to match it?
The output impedance is 50 Ω. For accurate amplitude and minimal reflections, use a 50 Ω load or terminate with a 50 Ω feedthrough terminator. For high-impedance loads, the amplitude will be higher than indicated.
How do I save and recall a setup?
Press the Store/Recall key. Use the knob to select a memory location (1-10). Press Store to save the current settings. To recall, select the location and press Recall.
What does the 'Sync' output do?
The Sync output provides a TTL-level square wave at the current output frequency. It can be used to trigger external devices or synchronize multiple instruments.
How to perform a factory reset?
Press and hold the Shift key then press the Reset key. The unit will restore default settings. All user memory will be cleared. Confirm by pressing Enter when prompted.
Is the USG-LF44 safe to use with sensitive circuits?
Yes, the generator has overload protection and a floating output (BNC shield connected to ground via a 1 MΩ resistor). However, avoid applying external voltages to the output to prevent damage. Always turn off the output before connecting to a powered circuit.
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USER MANUAL USG-LF44 GW Instek
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Product information
Brand : GW Instek
Model : USG-LF44
Category : Generator