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GW Instek GDS-800 Series User Manual User Manual

Page 10

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GDS-800 Series Digital Storage Oscilloscope Operation Manual

10

Probe compensation

To display an undistorted waveform on an oscilloscope, the probe must be matched

to the individual input impedance of each vertical amplifier.

For this purpose a square wave signal with a very fast rise time and minimum

overshoot should be used, as the sinusoidal contents cover a wide frequency range.

The build-in compensation signal generator provides a square wave signal with a

very fast rise time, and frequency of approx. 1kHz from the output socket below the

LCD screen. As the square wave signals are used for probe compensation

adjustment, neither the frequency accuracy nor the pulse duty factor are of

importance and therefore not specified.

The output provides 2V

pp

±3% for 10:1 probe. When the Y deflection coefficient is set

to 50mV/div, the calibration voltage corresponds to a vertical display of 4 divisions

(10:1 probe).

User checks the waveform indicated correct compensation (see Figure 3-2). If the

waveform indicates over or under compensation, use the alignment tool to adjust the

compensation.

incorrect

correct

incorrect

Figure 3-2: Probe compensations

For GDS-806S/C and GDS-810S/C only

GDS-806 and GDS-810 series provides a valuable “adjustable probe compensation
signal function”. The range for adjustable probe compensation signal is adjusted from
1kHz to 100kHz, 1kHz per step; and duty cycle is adjusted from 5% to 95%, 5% per
step. This function can satisfy user with the probe compensation easily and accurate.