Sweep Trigger; Sweep Trigger; Check Trigger Slope; Check/Adjust Auto Preset Triggering - Tektronix 221 Instruction Manual

Equipment Required
1. Constant amplitude signal generator
2. GR to BNC adapter
Control Settings
Preset the controls as given in the Preliminary Control
Settings.

21. Check Trigger Slope

a. Connect, to the constant amplitude signal generator,
a GR to BNC adapter and a T connector. Use a probe tip to
BNC adapter to connect the signal to the instrument.
Connect the 50-ohm BNC cable to the T connector.
Connect this cable to the EXT TRIG, using a dual banana
plug adapter (GND on adapter to COMMON).
b. Set the INPUT COUPLING switch to DC.
c. Set the SEC/DIV switch to 5 /i.
d. Set the frequency of the constant amplitude signal
generator to 50 kHz.
e. Set the vertical deflection factor fo r a signal greater
than 6 divisions.
f. Vary the LEVEL/SLOPE control to trigger on the
positive slope o f the display, then the negative slope.
g. Check that the display is triggered from the top
graticule line to the bottom graticule line.
® i
SWEEP TRIG G ER
3. Cable, 50-ohm BNC connectors
4. T Connectors, BNC
5. Probe tip to BNC adapter

22. Check/Adjust Auto Preset Triggering

a. Set the VO LTS/DIV switch to .1.
b. Set the constant amplitude signal generator for a
five-division display
c. Set the SEC/DIV to 5 0 n and the LEVEL/SLOPE to
AUTO-PRESET.
d. Set the VO LTS/DIV switch to 1.
e. Check that the display remains triggered (stable).
f. Adjust the AUTO PRESET (R214) side panel screw­
driver adjustment fo r a triggered display. See Fig. 5-9.
g. Switch TRIGGER selector to EXT.
h. Check that the display is stable.
i. Set the SEC/DIV switch to 1 ju.
j. Change frequency
generator to 5 MHz.
k. Check that the display remains stable (slight adjust­
ment of AUTO PRESET adjustment o f R214 may be
necessary).
REV. APR 1974
Calibration—221 Service
of constant amplitude signal
5-11