Tektronix 5441 Instruction Manual page 32

Operating Information-5441lR5441
Deflection
reference signal amplitude (volts)
lished in step 1) and the setting of the SecIDiv switch. This
Conversion
=
is the Deflection Conversion Factor.
Factor
deflection (divisions) X VoltsIDiv setting
Deflection
reference signal period (seconds)
Conversion
=
4. Set the VoltsIDiv switch to a setting that provides suf- Factor horizontal SecIDiv
ficient deflection to make the measurement. Do not readjust
deflection X switch
the variable VoltsIDiv control.
(divisions) setting
5. To establish a Modified Deflection Factor at any set-
3. To determine the period of an unknown signal, dis-
ting of the VoltsIDiv switch, multiply the VoltsIDiv switch connect the reference and apply the unknown signal.
setting by the Deflection Conversion Factor established in
step 2.
4. Set the SecIDiv switch to a setting that provides suffi-
Modified VoltslDiv Deflection
cient horizontal deflection to make an accurate measure-
Deflection
=
X Conversion
setting
ment. Do not readjust the variable SecIDiv control.
Factor Factor
5. To establish a Modified Deflection Factor at any set-
6. Measure the vertical deflection in divisions and deter-
ting of the Sec/Div switch, multiply the Sec/Div switch set-
mine the amplitude by the following formula.
ting by the Deflection Conversion Factor established in step
Signal Modified Deflection
2.
- -
Amplitude Factor (divisions) Modified Deflection
Deflection
=
switch setting X Conversion
Factor Factor
EXAMPLE: Assume a reference signal amplitude of
30 V, a VoltsIDiv switch setting of 5 V and a deflection of
four divisions. Substituting these values in the Deflection
6. Measure the horizontal deflection in divisions and de-
Conversion Factor formula (step 2):
termine the period by the following formula.
Modified horizontal
Period
=
Deflection X deflection
Then, with a VoltsIDiv switch setting of 2 V, the Modified
Factor (divisions)
Deflection Factor (step 5) is:
EXAMPLE: Assume a reference signal frequency of
To determine the peak-to-peak amplitude of an applied
455 Hz (period 2.2 ms), a SecIDiv switch Setting of .2 ms,
signal that produces a vertical deflection of five divisions
and a horizontal deflection of 8 div. Substituting these val-
with the above conditions, use the Signal Amplitude formula
ues in the Deflection Conversion Factor formula (step 2):
(step 6):
(3 V) (5)
=
15 V
2'2 ms
=
1.375
(8) (0.2 ms)
Sweep Rate
Then with a SecIDiv switch setting of 50 ps, the Modified
1. Apply a reference signal of known frequency to the
Deflection Factor (step 5) is:
vertical input connector. Using the SecIDiv switch and vari-
(50 ps) (1.375)
=
68.75 msldiv
able SecIDiv control, adjust the display so that one cycle of
the signal covers an exact number of horizontal divisions.
Do not change the variable SecIDiv control after obtaining
the desired deflection.
To determine the time period of an applied signal that
com~letes one cycle in seven horizontal divisions, use the
2. Divide the period of the reference signal (seconds) by
~ e r i b d formula (step 6):
the product of the horizontal deflection in divisions (estab- (68.75 ps) (7)
=
481 ps
REV MAY 1982