Tektronix 1S1 Instruction Manual page 123

Calibration – Type 1S1
Amplitude Calibrator
Display
Millivolts/Cm
Input Atten
Millivolts/Cm Variable
Vc Range
Comparison Voltage
Input Coupling (Chan
nel A)
Input Coupling (Channel
B)
44. Check External Trigger Kickout
a. Test equipment setup is shown in Fig. 5-64.
b. Connect the Type 1S1 EXT TRIG connector through a
coax cable and an adapter to the SIGNAL IN connector.
c. Adjust the TIME POSITION control to position the trig-
ger kickout pulse display on the crt screen of the indicator
oscilloscope.
d. Check the display for 25mv (2.5 cm) or less of trigger
kickout (see Fig. 5-65).
Fig. 5-65. Typical indicator oscilloscope display for checking
external trigger kickout.
e. Set the Type 1S1 TRIGGER SOURCE switch to EXT -
f. Check the display for 25mv or less of trigger kickout.
g. Disconnect the coax cable and adapter.
5-60
Off
A-Vc
5
1
Calib (at detent)
0
4.000
Ac
Gnd
45. Check Trigger Recovery Time
a. Reset the following Type 1S1 controls:
DISPLAY MODE
SAMPLES/CM
b. Set the TRIGGER SOURCE switch to EXT +.
c. Install the 10X probe on the vertical input of the test
oscilloscope.
d. Connect the test probe to the Type 1S1 HORIZ OUT-
PUT jack.
e. Trigger the test oscilloscope display.
f. Check the recovery time of the trigger circuit for each
time position range, as indicated in Table 5-8, with the RE-
COVERY TIME control set for minimum holdoff (counter-
clockwise, but not at SYNC). The recovery time is the time
between cycles of the waveform (see Fig. 5-66).
Fig. 5-66. Typical test oscilloscope display for checking
minimum recovery time of Type 1S1 trigger circuit. (Recovery
time on 50 nS time position range is illustrated) .
TABLE 5-8
Trigger Recovery Time
Type TIME
1S1 POSI-
TIME/ TION
CM RANGE Time/Cm
1 nSEC 50 nS 2 µSec
10 nSEC 500 nS 2 µSec
.1 µSEC 5 µS 5 µSec
1 µSEC 50 µS 50 µSec
10 µSEC 500 µS .5 mSec
g. After completion of this step, disconnect the probe tip and
reset the Type 1S1 DISPLAY MODE to NORMAL.
SINGLE SWEEP
MIN (Clockwise)
Test Recovery time limits
Oscillo- (with RECOVERY TIME
scope control ccw but not
SYNC)
5.0-6.5 (10-13 µsec)
5.0-6.5 (10-13 µsec)
4.0-5.4 (20-27 µsec)
3.6-4.6 (180-230 µsec)
3.6-4.6 (1.8-2.3 msec)