Section 3: Test and Calibration
3.3.8 Vertical movement range inspection
A. As shown by Figure 7 connected.
Tested oscilloscope
Oscilloscope calibration
Voltage output
CH1-BNC
Q
"
connection
Figure 7:
Connection of
vertical movement range inspection
B. Regulate the calibration to output some positive voltage and change the lower limit of zero
position, the oscilloscope will display a straight line. Regulate the calibration to output negative
voltage and change the upper limit of zero position, the oscilloscope will display a straight line.
The range between the lower limit and the upper limit is the vertical movement range.
C. Repeat step B and test the vertical movement range of voltage division for every channel.
3.3.9 Linear error inspection for vertical movement
A. As shown by Figure 4 connected. The CH1 is set as follows:
Coupling: AC Channel: On Probe: 1X Invert: Off
Time base division: 1ms Measured window 1: Peak-peak value of CH1
B. Make the signal generator output 1KHz of sine wave and adjust output voltage until the
displayed amplitude 50% center of the checked working spare, record the peak-peak value A of
measured window 1, then adjust the zero position and record the corresponding peak-peak value B
and C of measured window 1 that the top and the bottom of the waveform takes up the upper limit
and the lower limit of checked working spare respectively, the linear error are as follows which is
the relatively large value:
2(
B
+
A
)%
A
2$
100% and
2(
C
+
A
)%
A
2$
100%
C. Repeat step B and inspect linear error for vertical movement of every channel.
3.3.10 Input impedance inspection
A. As shown by Figure 8 connected:
14
