Tektronix ECO 422, Instruction Manual

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Performance Verification
ECO 422
5–11
CHECK – that there are no errors shown for either the Primary or Backup
ECO 422 sync sources.
Set the ECO 422 to “Backup” Sync Source and Auto Switch to “Switch on
Fault.”
Add attenuation, 0.5 dB at a time, to the Backup input signal until the signal
source switches to the Primary.
Press the Reset button on the front panel and try to return the signal source
to Backup.
CHECK – that the Backup signal still shows an error and automatically
switches back to Primary. If the ECO 422 does not continue to show the
Backup signal in error after the reset, continue adding attenuation until the
Backup signal switches to Primary again.
Note the attenuation of the step attenuator.
CHECK – that the ECO switches between 2 and 4 dB down.
6. Check the NTSC & PAL Black Burst for Channels 2 – 11
Switch between 2 and 4 dB down from nominal
Repeat the four previous procedures for Channels 2 – 11 of the ECO 422.
Move the cables from Channel 1 to the channel under test. Replace the
switch setting for S1 as given in the following Table.
Channel No. Switch No.
2 S2
3 S3
4 S4
5 S5
6 S6
7 S7
8 S8
9 S9
10 S10
11 S11
7. Serial Digital Component Check for Channel 1 Primary
Switch between 2 and 5 dB down from nominal
Connect the equipment as shown in Figure 5–2.
Serial Digital Video
Checks