Tektronix 2445A - Page 21

Specification-2445A/2455A Service
Table 1-2 (cont)
Characteristics Perfonnance Requirements
ADDED DELAY TIME CHARACTERISTICS WITH
C/T /T
Run After Delay
Accuracy
Triggerable After Delay
Accuracy
Minimum Measurable Delay Time
Display Update Rate
•Performance requirement not checked In manual.
(b) See Tables 1-3 and 1-4.
(b) Time/Div Includes SEC/DIV, X10 MAG, and VAR.
LSD + [0.0012 X (A SEC/DIV)] + [0.03 X (B Time/Divf + A
Trigger Level Error + 50 ns.
1
When the A Sweep is triggered by the Word Recognizer in
synchronous mode, add 100 ns for probe delay;
in asynchronous
mode, add 200 ns for probe delay.
For intervals within
70 ns to 1 0 times the A-SEC/DIV Setting.
LSD
+ [10 ppm x (measured interval)] + TJE + A-Trigger Level
Error
+ B-Trigger Level Error + 0.5 ns.
1
If the A and B Sweeps are triggered from different channels, add
0.5 ns for channel-to-channel mismatch.
When the A Sweep is triggered by the Word Recognizer in
synchronous mode, add 100 ns for probe delay;
in asynchronous
mode, add 200 ns for probe delay.
<=70 ns.
1
In Auto Resolution, twice per second or once for every sweep,
whichever is slower.
1
In 1 ns, 100 ps, and 10 ps resolution modes, the update rate
depends on the A SEC/DIV setting and the trigger repetition rate.
1-13