User Manual
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1) Use a lint-free cloth to remove floating dust on the outside of the oscilloscope and probes. Take care to avoid scratching
the glabrous display filter.
2) Use a soft cloth dampened with water to clean the oscilloscope. For more efficient cleaning, you may use an aqueous
solution of 75% isopropyl alcohol.
Note: To avoid damage to the surface of the oscilloscope or probes, do not use any corrosive or chemical cleaning agents.
Appendix A: Technical Specifications
All technical specifications are applicable to QC1938 digital storage oscilloscopes, see the last part of this chapter for details.
To verify whether the oscilloscope meets the technical specifications, the oscilloscope must first meet the following
conditions:
The oscilloscope must have been operating continuously for twenty minutes under the specified operating temperature.
The Do Self Cal operation must be performed through the Utility menu if the operating temperature changes by more than
5℃.
The oscilloscope must be within the factory calibration interval.
All specifications are guaranteed unless noted ‘typical’.
Oscilloscope Specifications
Horizontal
2ns/div to 100s/div, in a 1, 2, 5 sequence
Delta Time Measurement Accuracy
(Full Bandwidth)
Single, sampling mode
± (1 sample interval +100ppm × reading + 0.6ns)
＞16 times above average
± (1 sample interval + 100ppm × reading + 0.4ns)
Sample interval = s/div ÷ 200
Vertical
8-bit resolution, each channel sampled simultaneously
2mV/div to 10V/div at input BNC
2mV~200mV/div, ±1V
500mV/div~10V/div, ±50V
Selectable Analog Bandwidth Limit,
typical
Low Frequency Response (-3db)
Rise Time at BNC, typical
±3% for Normal or Average acquisition mode, 10V/div to 10mV/div
±4% for Normal or Average acquisition mode, 5mV/div to 2mV/div
Note: Bandwidth reduced to 6MHz when using a 1X probe.
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