Specifications
11-28
Performance Tests
Error Detector Performance Tests
Audible Error Output
1. Select and set to . Set the Audio output volume
to level 1 (as displayed in the error detector synchronization and audio control
window.) Set the sync threshold to 1E−1.
2. Set up the pattern generator to generate single errors (select ,
.)
3. Select and verify that the system emits a short audible tone burst.
4. Select , and verify that the instrument emits similar tone
bursts to the previous one but spaced approximately at one second intervals.
5. Press the to keys in sequence and verify that a continuous tone rising in
pitch is emitted for each successive key press.
6. Press followed by . Using the RPG control, verify
that the tone volume increases and the displayed audio volume goes from 1 to 15.
Data 0/1 Threshold Auto/Manual Test
Configure the equipment as in Figure 11-15.
1. Press followed by .
2. Record the value of the 0/1 Threshold setting from the display which should nominally
250 mV with no sync loss or errors.
3. Return the 0/1 Threshold AUTO/MAN setting to MAN.
4. Press the key and adjust the DATA offset level to −2.000 V and DATA
amplitude to 2.000 V.
5. Press the key and set the key to
. Record the 0/1 threshold value from the display. This should be nominally
-3 V with no sync loss or errors.
6. Return the setting to .
7. Press and adjust the DATA offset level to +1.5 V.
8. Press the key and set the key to
. Record the 0/1 threshold value from the display. This should be nominally
500 mV with no sync loss or errors.
9. Return the , press the
key and verify that the threshold value can be adjusted within the range 1.000 V to
-3.000 V (sync and data loss may occur as this operation is performed).
sync & audio
AUDIO ON OFF ON
error add
ERR-ADD SINGLE
ERR-ADD SINGLE
ERR-ADD FIXED 1e-9
1e-8 1e-3
sync & audio
AUDIO VOLUME
INST PRESET input & eye
data output
input & eye
0/1 Threshold AUTO/MAN
AUTO
0/1 Threshold AUTO/MAN MAN
data output
input & eye
0/1 Threshold AUTO/MAN
AUTO
0/1 Threshold AUTO/MAN 0/1 Manual Threshold