can observe the waveform of the whole area
.
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9. X-Y operation
Set the sweep rate switch in X-Y position, the mode of oscilloscope is X-Y.
X-axial: CH1 input
Y-axial: CH2 input
8 Y- Y-axial X- X-axial
Note: when HF signal in X-Y mode, should notice the difference of frequency and phase of X and Y axial
X-Y mode allows the oscilloscope perform many tests that normal oscilloscope unavailable to. CRT can display an
electronic image or two instant levels. It can be the directly comparison of the both levels, just as the vector oscilloscope
display visual colorful images. If some relative parameters (frequency, temperature, rate etc.) are converted to voltage by
using a sensor, X-Y mode can display almost any of the dynamic parameter images. Test of frequency response is a
common example. Y-axial represents signal amplitude, X-axial represents frequency. (See fig 8)
10. Probe calibration
As concern above, oscilloscope probe can use for a very wide frequency range, but phase compensation is must.
Distort waveform may cause measurement error. Therefore, it should proceed probe calibration before measurement.
Connect 10:1 probe to the input of CH1 or CH2, set the attenuation switch to 50mV, connect the probe needle to the
input of calibration signal, adjust compensation capacitor to the best waveform (no overshoot, fillet, upwarping). (See fig
9)
9 Fig 9
Appropriate compensation
Overcompensation
Undercompensation
11. DC balance adjustment (DC BAL)
Set the input coupling switch of CH1 and CH2 in GND, trigger mode in AUTO, adjust trace in centre position.
Adjust the attenuation switch between 5mV and 10mV, tune DC BAL until the trace is below zero horizontal line
and keep stationary.
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Warning: No operator serviceable component inside, do not remove covers, refer servicing to
qualified personnel only.
1. Replacement of fuse
If the fuse is burnout, power indicator will go out, and the oscilloscope will failure to work. Usually the fuse is not
open circuit, unless the circuit has problem. Check the circuit problem at first, which may cause the fuse breakout, then
replace the fuse. Use the specification with the original fuse. The fuse is on the rear panel, see fig 4-2.
Warning: To avoid fire, use the fuse with 250V voltage and pertinent current only. Disconnect the
power cord before replacement.
2. Clean
Clean oscilloscope by using a soft cloth, which has been dipped neutral detergent and water. Do not pray the detergent
on to the oscilloscope surface directly, since it may cause the inside parts damaged.
Do not use the chemicals with gasoline, benzene, toluene, xylene, acetone or other similar solvents.
Do not use abrasive powder or similar detergent to clean the oscilloscope.
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