Vertical Checks - Tektronix 1S1 Instruction Manual

21. Adjust Vertical Gain
a. Test equipment setup is shown in Fig. 5-36.
b. Connect a coax cable from the 50
brator Output connector to the SIGNAL IN connector of the
Type 1S1.
c. Connect the 50 amplitude calibrator Trigger Output
signal through a coax cable and a 2X attenuator (BNC con-
nectors) to the Type 1S1 EXT TRIG connector.
d. Set the 50 amplitude calibrator VOLTS switch to the
.6 position.
e. Trigger the display with the TRIGGER SENSITIVITY
control.
f. Position the waveform with the DC OFFSET control
so the baseline is on the graticule line 1 cm below the hori-
zontal centerline (see Fig. 5-37).
g. Check the display amplitude for 3.00cm of vertical
deflection ±0.09 cm.
h. Adjust the front-panel VERT GAIN screwdriver-adjust
control if the display amplitude is not correct.
Fig. 5-37. Typical indicator oscilloscope display for checking
adjustment of VERT GAIN control.

VERTICAL CHECKS

22. Check mVolts/Cm Accuracy
a. Leave the signal and trigger cables connected to the
Type 1S1 SIGNAL IN and EXT TRIG connectors,
b. Set the Type 1S1 mVOLTS/CM switch to each position
from 100 to 2 and check the attenuator accuracy as indi-
cated in Table 5-1. The deflection factor should be within
3% of the amount indicated at each setting of the mVOLTS/
CM switch. If it is not, the VERT GAIN control may require
slight readjustment.
23. Check mVolts/Cm Variable
a. Leave the 50 amplitude calibrator signals connected
to the Type 1S1.
b. Set the Type 1S1 mVOLTS/CM switch to 200.
mVOLTS/
amplitude cali-
*Insert 2X attenuator for reading, then remove attenuator. (Atten-
uator inaccuracy must be added to deflection factor tolerance.)
Fig. 5-38. Indicator oscilloscope displays for checking mVolts/Cm
VARIABLE control.
c. Set the amplitude calibrator Volts switch to the .12
position.
d. Trigger the oscilloscope display with the Type 1S1
TRIGGER SENSITIVITY control. Display amplitude should
be 0.6 cm (see Fig. 5-38A).
e. Set the mVolts/Cm VARIABLE control for maximum dis-
play amplitude.
f. Check for at least 2.4cm of deflection, indicating a
4:1 increase from the calibrated position (see Fig. 5-38B).
g. Return the VARIABLE control to CAL position.
TABLE 5-1
mVOLTS/CM Accuracy Check
50 Amplitude
CM Calibrator
100 .3 Volts
50 .12 Volts
20 .06 Volts
10 .03 Volts
5 .012 Volts
2 .012 Volts
Calibration – Type 1S1
Display Tolerance
Amplitude
3.0 cm ±0.09 cm
2.4 cm ±0.07 cm
3.0 cm ±0.09 cm
3.0 cm ±0.09 cm
2.4 cm ±0.07 cm
3.0 cm* ±0.09 cm*
5-33