4.6. Other functions
(25) PROBE ADJUST - Outputs a rectangular signal (2.5 V peak to peak; 1 kHz).
This signal is used for compensation of measurement probes or for checking vertical
amplifiers and the timebase.
(2) TRACE ROTATION - Adjustment of the parallelism of traces with respect to
horizontal axes (this adjustment is made using a screwdriver).
5. APPLICATIONS
5.1. Adjustment of probes with the calibration signal
• Connect the PROBE ADJUST output (25) to the CH1 input (26) using a
measurement probe with a ratio of 1/10.
• Select the following functions:
CH1 sensitivity (5): 50 mV/div. (1/10 probe)
sweep speed (15): 0.2 ms/div.
trigger source (17) (21): CH1
trigger mode (16): AUTO
• If necessary, perform horizontal framing using the POSITION control (8) and
stabilize the trace using the LEVEL potentiometer (13):
• Adjust the probe compensation capacitor:
figure 1
5.2. Display a video signal
5.2.1. Examination of a TV line
• Select: CH1 display mode
the CH1 trigger source
the TVH coupling
the positive trigger slope (light off)
the sweep speed 20 µs/div.
• Inject a TV composite video signal with the following characteristics on channel CH1:
positive modulation
vertical bands in grey scale.
The calibration signal may also be displayed on channel CH2.
overcompensated probe
compensated probe
undercompensated probe
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