Settings For Timing Accuracy Checks - Tektronix 2215A Instruction Manual

Performance Check Procedure—2215A Service
Table 4-4

Settings for Timing Accuracy Checks

Time-Mark Generator Setting
SEC/DIV
Switch Setting Normal
m s
0.05 50 ns
iis
0.1 0.1
ns 0.2
0.2
m s 0.5
0.5
/iS
1 1
2 ns
ns
2
5
ms 5
10 10 M S
ms
ns
20 20
m s 50
50
0.1 ms
0.1 ms
0.2 ms 0.2 ms
0.5 ms
0.5 ms
1 ms 1 ms
2 ms 2 ms
5 ms 5 ms
10 ms 10 ms
20 ms 20 ms
50 ms 50 ms
A Sweep Only
0.1 s
0.1 s
0.2 s 0.2 s
0.5 s
0.5 s
NOTE
F o r che cking the tim in g a cc u ra cy o f th e A S E C /D IV
s w itc h s e ttin g s from 5 0 m s to 0 .5 s, w a tc h the tim e
m a rk e r tips o n ly a t the 2 n d a n d 10th v e rtic a l g ra tic u le
lines while a d ju stin g the H o riz o n ta l P O S IT IO N con tro l.
f. Repeat parts c through e for the remaining A SEC/DIV
and time-mark generator setting combinations shown in Ta­
ble 4-4 under the "Normal" column.
g. Set:
A SEC/DIV
X I0 Magnifier
h. Select 10-ns time markers from the time-mark
generator.
4-8
X10 Magnified
10 ns
iis 10 ns
fis
20 ns
ns
50 ns
fiS
0.1 MS
0.2
ms
ns m s
0.5
1 MS
2 MS
ms
5 M S
m s
10 M S
20
ms
m s
50
0.1 m s
0.2 m s
0.5 ms
1 m s
2 ms
5 ms
10 ms
20 ms
50 ms
ns
0.05
On (knob out)
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.
j. CHECK— Timing accuracy is within 4% (0.32 division
at the 10th vertical graticule line), and linearity is within 7%
(0.14 division over any 2 of the center 8 divisions). Exclude
any portion of the sweep past the 100th magnified division.
k. Repeat parts i and j for the remaining A SEC/DIV and
time-mark generator setting combinations shown in Table
4-4 under the "X I0 Magnified" column.
I. Set:
HORIZONTAL MODE
A SEC/DIV
B SEC/DIV
X I0 Magnifier
m. Repeat parts b through k for the B Sweep. Keep the
A SEC/DIV switch one setting slower than the B SEC/DIV
switch.
2. Check Variable Range
a. Set:
HORIZONTAL MODE
A and B SEC/DIV
SEC/DIV Variable
X I0 Magnifier
A TRIGGER Mode
b. Select 0.5-ms time markers from the time-mark
generator.
c. CHECK— Time markers are 1 division or less apart.
3. Check Delay Tim e Dial Range and Accuracy
a. Set:
Channel 1 Input Coupling
SEC/DIV Variable
HORIZONTAL MODE
b. Set the B DELAY TIME POSITION dial fully
counterclockwise.
c. Align the start of the A Sweep with the 1st vertical
graticule line using the Horizontal POSITION control.
B
ns
0.1
ns
0.05
Off (knob in)
A
0.2 ms
Fully counterclockwise
Off (knob in)
P-P AUTO
GND
CAL detent
ALT