Tektronix 5110, Инструкция по эксплуатации

Страница: 14 / 128

Operating lnstructlons-5110
2. Set the input coupling to ac and set the Volts/Div
switch to display about 5 or 6 vertical divisions of the
waveform. Check that the variable Volts/Div control (red
knob) is in the Cal position.
EXAMPLE: Assume a peak-to-peak vertical deflection
of 4.6 divisions and a Volts/Div switch setting of 5 V.
Peak-to-peak _ 4.6 x 5 (Volts/Div _ 23
volts (divisions) setting) volts
3. Adjust the time-base triggering controls for a stable
display and set the Seconds/Div switch to display several
cycles of the waveform.
4. Turn the vertical Position control so that the lower
portion of the waveform coincides with one of the
graticule lines below the center horizontal line, and the top
of the waveform is in the viewing area. Move the display
with the horizontal Position control so that one of the
upper peaks is aligned with the center vertical reference
line (see Fig. 1-3).
NOTE
If an attenuator probe is used that cannot change the
scale factor readout (Volts/Div), multiply the right
side of the above equation by the attenuation factor.
5. Measure the vertical deflection from peak to peak
(divisions).
NOTE
This technique may also be used to make
measurements between two points on the waveform,
rather than peak-to-peak.
Instantaneous Voltage Measurement—DC
To measure the dc level at a given point on a waveform,
use the following procedure:
1. Set the input coupling of the vertical plug-in unit to
Gnd and position the trace to the bottom line of the
graticule (or other selected reference line). If the voltage
to be measured is negative with respect to ground,
position the trace to the top line of the graticule. Do not
move the vertical Postion control after this reference has
been established.
6. Multiply the distance (in divisions) measured in step
5 by the Volts/Div switch setting. Also include the
attenuation factor of the probe, if applicable.
Position Io center
vertical line
Fig. 1-3. Measuring peak-to-peak voltage of a waveform.
NOTE
To measure a voltage level with respect to a voltage
other than ground, make the following changes to
step 1: Set the input coupling switch to dc and apply
the reference voltage to the input connector, then
position the trace to the reference line.
2. Connect the signal to the input connector. Set the
input coupling to dc (the ground reference can be
checked at any time by setting the input coupling to Gnd).
3. Set the Volts/Div switch to display about 5 or 6
vertical divisions of the waveform. Check that the variable
Volts/Div control (red knob) is in the Cal position. Adjust
the time-base triggering controls for a stable display.
4. Measure
the distance in divisions between the
reference line and the point on the waveform at which the
de level is to be measured. For example, in Fig. 1-4 the
measurement is made between the reference line and
point A.
1-8