Fluke 54200 - Diverse; EHT Test

How to Use the Instrument
Description and Applications of the Test Patterns
4
4-69
DIVERSE
The
DIVERSE
key offers two different test patterns:
EHT Test
IRS17
EHT Test
EHT Test is a B/W pattern with white border lines (Y = 95% or 95 IRE) forming a
rectangle with a white window (Y = 100% or 100 IRE) in the center of the screen on a
black background. The window is automatically switched off and on at a frequency of
about 4 Hz (625 line systems) or 5 Hz (525 Hz line systems).
Press the
DIVERSE
key to select the
EHT TEST
in the
Diverse
popup menu.
Figure 4-104. EHT Test, Window OFF Figure 4-105. EHT Test, Window ON
Applications:
This pattern is specially designed for testing of the EHT (Extremely-High Tension)
stabilization in TV receivers and monitors. The outer rectangle should remain the same
shape and size when the middle part changes from black to white and vice versa. If this
rectangle changes, the EHT is not stable.