Tektronix TYPE L, Instruction Manual, Page: 11 / 46

V
I N C O R R E C T
C O R R E C T
I N C O R R E C T
Fig. 2-2. Waveforms for adjustment of probe compensation.
ment to warm up (15 min.) after the POWER
has been turned ON.
2. Connect the probe cable to the INPUT con­
nector of the L Unit.
3. Touch the probe tip to the C ALIB RATO R
output connector and adjust the S T A B IL IT Y
and TRIGGERING L E V E L controls for a stable
display of the waveform.
4. Adjust the probe capacitor fo r a flat top
on the square wave. See Figure 2-2 fo r a
display of the waveform. The Instruction Manual
fo r the instrument with which the probe was
supplied shows the method of adjusting the
particular probe.
V o ltage M easurem ents
Two types of voltage measurements may
be made with an oscilloscope/Type L Plug-In
Unit combination: (1) peak-to-peak voltage of
a displayed waveform , and (2) peak voltage
o f a waveform with respect to a reference
voltage. The following procedures are intended
to show general methods, and can be modified
to suit any particular application.
In measuring signal amplitudes it is important
to rem em ber that the width of the trace may
be an appreciable part of the overall m easure­
ment. This is particularly true when measuring
signals of small amplitude. A ll measurements
should be consistently made from the same
part of the trace--the top, center or bottom.
If the center of the trace is used for one
reading, it should be used fo r all subsequent
readings.
Notice that points " a " and " b "
in Figure 2-3 correspond to the center of
the trace.
M easu rin g P eak -to-P eak Voltages
To measure the peak-to-peak voltage of a
particular signal, the following method may
be used:
1. Set the AC-DC switch at any convenient
position. Apply the voltage signal to the INPUT
connector by means of the appropriate cable
o r probe, and necessary terminations and atten­
uators. Adjust the controls of the oscilloscope
and plug-in to display the signal waveform on
the crt. Use as large an amplitude as possible
without exceeding the size of the graticule. Be
sure the VARIABLE (VOLTS/CM) control is
in CALIBRATED position.
Fig. 2-3. Measurement of peak-to-peak signal amplitude.
2. Using the graticule markings, determine the
vertical difference in centimeters (m ajor
graticule divisions) between the maximum and
minimum peaks of the waveform.
3. Multiply the graticule measurement by the
setting of the VOLTS/CM switch. Use the
black numbers for AC or DC, and the blue
numbers fo r X10 GAIN
AC. This product
is the voltage at the INPUT connector.
4. If an attenuator o r attenuator probe is
used, multiply the input voltage by the total
attenuation factor of the connective system.
AA
Operating Instructions - Type L Plug-In
2-5