Instantaneous Voltage - Tektronix 2235A Instruction Manual

Operatlng instructions
-
2235A Instruction
POSITION TO
CENTER LINE
1
--I
VERTICAL
DEFLECTION
- -
MEASURE AMPLITUDE
1
FROM
@
TO
@
4732-07
Figure 2-10. Peak-to-peak waveform voltage.
NOTE
If the amplitude measurement is critical or if the
trace is thick (as a result of hum or noise on the
signal), a more accurate value can be obtained
by measuring from the top of a peak to the top of
a valley. This will eliminate trace thickness from
the measurement.
9. Calculate the peak-to-peak voltage, using the fol-
lowing formula:
1. Preset instrument controls and obtain a baseline
trace.
2. Apply the signal to eithervertical-channel input con-
nector and set the Vertical MODE switch to display
the channel used.
3. Verify that the VOLTSIDIV Variable control is in the
CAL detent and set the lnput Coupling switch to
GND.
4. Vertically position the baseline trace to the center
horizontal graticule line. This establishes the ground
reference location.
NOTE
If measurements are to be made relative to a
voltage level other than ground, set the lnput
Coupling switch to DC and apply the reference
voltage to the input connector. Then position
the trace to the reference (horizontal graticule)
line.
5. Set the lnput Coupling switch to DC. Points on the
waveform above the ground reference location are
positive. Those points below are negative.
VOLTSIDIV
vertical switch setting
NOTE
Volts (p-p)
=
deflection
x
indicated by 1X
(divisions)
(or 1 O X PROBE when
When using Channel 2 , ensure that the lnverl
10X probe is used)
mode is not selected (INVERT button out).
EXAMPLE: The measured peak-to-peak vertical
deflection is 4.6 divisions (see Figure 2-10) using a
6. If necessary, repeat Step 4 using a different ref-
10X attenuator probe with the VOLTSIDIV switch set
erence line which allows the waveform in Step 5 to
t o 5 V (at 10X PROBE setting).
be displayed on screen.
Substituting the given values: 7
Volts (p-p)
=
4.6 div X 5 Vldiv
=
23 V .
8.
Instantaneous Voltage
9.
T o measure instantaneous voltage level at a given point
on a waveform, referred to ground, use the following
procedure:
Adjust the A TRIGGER LEVEL control to obtain a
stable display.
Set the A SECIDIV switch to a position that displays
several cycles of the signal.
Measure the divisions of vertical deflection between
the ground reference line and the point on the
waveform at which the level is to be determined (see
Figure 2-1 1).
Scans by
ARTEK MEDL4
=>