Normal Sweep Timing Accuracy; Magnified Sweep Timing Accuracy - Tektronix T921 Instruction Manual

REV . A, DEC . 1976
b. Set: CH 1 VOLTS/DIV
.2 V
SOURCE
INT
MODE NORM
c . CHECK-SEC/DIV accuracy according to Table 3-
3: One or two time marks, as indicated, within 3% (0 .24 div)
over center 8 divisions. Accuracy. specifications apply for
a temperature range of +20°C to +30°C.
TABLE 3-3
Normal Sweep Timing Accuracy
16 . Magnified Sweep Accuracy
a. Set: X1-X10
X10 (fully cw)
SEC/DIV
0.2 ps
b. Set time-mark generator to 10 ns (adjust CH 1
VOLTS/DIV as necessary for a visible display) .
NOTE
If you cannot obtain a stable display, connect the
time-mark generator trigger output to the X or EXT
(external trigger) connector via a 50 0 cable and
50 0 termination . Set MODE to EXT and adjust
LEVEL control for a stable display .
Performance Check-T921/T922/T922R
c. CHECK-Magnified sweep accuracy according to
Table 3-4: One or two time marks, as indicated, within 5%
(0 .4 div) over center 8 divisions. Exclude the first 50 ns
after the start of the sweep; 2.5 divisions for the 0.2 ps
setting (one division for 0.5 ,us and 1 /is settings) and
anything beyond the 100th magnified divisions. Accuracy
specifications apply for a temperature range of +20'C to
+30° C.
d. Return X1-X10 to X1 and SOURCE to INT.
e. Disconnect test equipment.
a. Set :
TABLE 3-4
Magnified Sweep Timing Accuracy
17 . Rear Panel Outputs (T922R)
Vertical Mode CH 1
CH 1 VOLTS/DIV .1
SEC/DIV .5 ps
Trigger MODE AUTO
Trigger SOURCE INT
b. Connect 50
f2
BNC cable to SWEEP RAMP OUT
connector. Connect 50 O termination to free end of cable.
Connect 50
f2
termination to CH 1 vertical input.
. c. CHECK-Display is tilted line (see Fig. 3-6) .
d. Disconnect cable from SWEEP RAMP OUT connec-
tor and connect it to SWEEP GATE OUT connector.
e. CHECK-Display is leading edge of squarewave
(see Fig . 3-7) .
f. Disconnect cable and termination .
3- 9
SEC/DIV switch
setting
Time-mark
generator output
crt display
(marker/division)
.2 /is 0 .1 microsecond
2
.5 /is 0 .5 mi crosecond
1
1 Ps
1 microsecond 1
2 /is
1 microsecond 2
5 us 5 microsecond
1
_
10 /is
10 microsecond 1
20 ps 10 microsecond 2
50 Ps 50 microsecond
1
.1 ms
0.1 millisecond 1
.2 ms
0.1 millisecond 2
.5 ms
0.5 millisecond 1
1 ms 1 millisecond
1
2 ms
1 millisecond 2 _
5 ms
5 millisecond 1
10 ms
10 millisecond 1
20 ms 10 millisecond 2
50 ms 50 millisecond
1
.1 s 0 .1 second
1
._2 s 0 .1 second
2 _
_
5 s 0 .5 second
1
SEC/DIV switch
setting
Time-mark
generator output
crt display
(markers/division)
.2 /is
10 nanosecond 2
.5 ps
50 nanosecond
1
1 ps .1 microsecond
1
.5 ms 50 microsecond
1