Other Functions; Applications; Adjustment Of Probes With The Calibration Signal; Display A Video Signal - Metrix OX 520B Manual De Funcionamiento

Chapter II
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:
•
If necessary, perform horizontal framing using the POSITION control (8) and
stabilize the trace using the LEVEL potentiometer (13):
•
Adjust the probe compensation capacitor:
(
The calibration signal may also be displayed on channel CH2.
5.2.

Display a video signal

5.2.1. Examination of a TV line

• Select:
• Inject a TV composite video signal with the following characteristics on channel CH1:
20 MHz oscilloscope
' CH1 sensitivity (5):
' sweep speed (15):
' trigger source (17) (21):
' trigger mode (16):
figure 1
' CH1 display mode
' the CH1 trigger source
' the TVH coupling
' the positive trigger slope (light off)
' the sweep speed 20 µs/div.
' positive modulation
' vertical bands in grey scale.
50 mV/div. (1/10 probe)
0.2 ms/div.
CH1
AUTO
overcompensated probe
compensated probe
undercompensated probe
19