Check Variable Range And Sweep Separation; Check Delay Time Dial Rarlge Andaccuracy - Tektronix 2235A Instruction Manual

Performance Check Procedure
-
2235A Instruction
Table 4-4
Settlngs for Timing Accuracy Checks
A Sweep Only
SECIDIV
Switch
Setting
0.05 ps
0.1 ps
0.2 ps
0.5 ps
1 PS
2 PS
5 PS
10 ps
20 ps
50 ps
0.1 ms
0.2 ms
0.5 ms
1 ms
2 ms
5 ms
10 ms
20 ms
50 ms
h. Select 10-ns time markers from the time-mark
generator.
i. Use the Horizontal POSITION control to align the
first time marker that is 25 ns beyond the start of the
sweep with the second vertical graticule line.
Time-Mark
Normal
50 ns
0.1 ps
0.2 ps
0.5 ps
1 PS
2 PS
5 PS
10 ps
20 ps
50 ps
0.1 ms
0.2 ms
0.5 ms
1 ms
2 ms
5 ms
10 ms
20 ms
50 ms
j. CHECK-Timing accuracy is within 3% (0.24
division at the 10th vertical graticule line) and
linearity is within 5% (0.1 division over any 2 of the
center 8 divisions). Exclude any portion of the
sweep past the 100th magnified division.
Generator Setting
X I
0 Magnified
10 ns
10 ns
20 ns
50 ns
0.1 ps
0.2 ps
0.5 ps
1 PS
2 PS
5 P S
10 ps
20 ps
50 ps
0.1 ms
0.2 ms
0.5 ms
1 ms
2 ms
5 ms
Repeat parts
i
and j for the remaining A SECIDIV and
time-mark generator setting combinations shown in
Table 4-4 under the XI 0 Magnified column.
Set:
Horizontal MODE B
A SECIDIV 0.1 ps
B SECIDIV 0.05
p S
XI 0 Magnifier Off (knob in)
A TRIGGER Mode P-P AUTO
Repeat parts b through kfor the B Sweep. Keep theA
SECIDIV switch one setting slower than the B SECI
DIV switch.
Check Variable Range and Sweep Separation
Set:
Horizontal MODE
A and B SECIDIV
SECIDIV Variable
XI0 Magnifier
A
0.2 ms
Fully counter-
clockwise
Off (knob in)
Select 0.5-ms time markers from the time-mark
generator.
CHECK-Time markers are 1 division or less apart.
Set:
Channel 1 Input Coupling GND
SECIDIV Variable CAL detent
Horizontal MODE ALT
Use the Channel 1 POSITION control to set the A
Sweep at the center horizontal graticule line.
CHECK- The B Sweep can be positioned more than
3.5 divisions above and below the A Sweep when
the AIB SWP SEP control is rotated fully clockwise
and counterclockwise respectively.
Check Delay Time Dial Range and Accuracy
Set the B DELAY TIME POSITION dial fully counter-
clockwise.
Align the start of the A Sweep with the 1st vertical
graticule line using the Horizontal POSITION
control.
CHECK- Intensified portion of the trace starts within
0.5 division of the start of the sweep.
Scans by AR TEK MEDL.4 =>