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Basic Applications - 2221 Operators
5. Read the time difference between the two measure
ment points of interest .
TV FIELD SIGNAL
The television feature of the instrument can also be
used to display TV Field signals .
6. Slope is determined by using the measured voltage
and time to calculate the rate of change using the follow
ing formula :
1. Preset instrument controls and obtain a baseline
trace .
Slope ( rate of change )
Change in voltage
Change in time
As an example , in Figure 6-11, the voltage difference
between the measurement points is 1.74 V , and the time
difference is 5.42 ms .
2. Set the TRIGGER Mode switch to TV FIELD ( P - P
AUTO and NORM buttons both pushed in) and set the
SEC/ DIV switch to 2 ms .
Substituting these values into the formula :
3. To display a single field , connect the TV signal to
either vertical-channel input connector and set the VERTI
CAL MODE switch to display the channel used .
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Slope
1.74
0.32 V / ms
5.42 ms
4. Set the appropriate VOLTS / DIV switch to display
2.5 divisions or more of composite video signal .
TV LINE SIGNAL
5. Set the TRIGGER SLOPE switch to either OUT (for
positive - going TV signal sync pulses ) or IN ( for negative
going TV signal sync pulses ) .
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The following procedure is used to display a TV Line
signal :
1. Preset instrument controls and select P- P AUTO / TV
LINE TRIGGER Mode.
6. To change the field that is displayed , momentarily
interrupt the trigger signal by setting the AC-GND- DC
switch to GND and then back to AC until the desired field
is displayed .
2. Apply the TV signal to either vertical- channel input
connector and set the VERTICAL MODE Switches to
display the channel used .
NOTE
3. Set the appropriate VOLTS /DIV switch to display
0.3 division or more of composite video signal .
To examine a TV Field signal in more detail, use the
X10 Magnifier.
4. Set the SEC/ DIV switch to 10 us .
5. Set the TRIGGER SLOPE switch to either OUT ( for
positive - going TV signal sync pulses) or IN (for negative
going TV signal sync pulses) .
7. To display either Field 1 or Field 2 individually , con
nect the TV signal to both CH 1 and CH 2 input connec
tors and select BOTH and ALT VERTICAL MODE .
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NOTE
To examine a TV Line signal in more detail, use the
X10 Magnifier.
8. Set the SEC/ DIV switch to a faster sweep speed
(displays of less than one full field ). This will synchronize
the Channel 1 display to one field and the Channel 2
display to the other field .
6-13
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