Tektronix 314 Manual

Instantaneous Voltage Measurement
Instantaneous voltage is measured with respect to some re 
ference potential (usually ground). This reference level is
first established by positioning the trace along a graticule
line with the reference potential applied to the input. If
using a P6049B Probe, press the GND REF button on the
probe body to obtain the ground reference. Then, the
instantaneous voltage is applied and measured above or
below the reference line. In this type of measurement, the
Input Coupling switch must be in the DC position. This
method can also be used to measure the d c component of
a waveform, since the average or d c value can be measured
as a voltage above the reference level.
a. Set the vertical deflection factor to an appropriate setting
for the voltage to be measured; set the LEVEL control to
midrange and press AUTO button in.
b. Set Input Coupling switch to DC. Touch the probe tip
to the reference voltage and vertically position the trace to
graticule center. Press the P6049B Probe GND REF button
and position the trace to a reference (any convenient hori 
zontal graticule line). Release the GND REF button. Do
not change the POSITION control setting after the reference
has been set.
c. Set TIME/DIV switch, LEVEL control and SLOPE switch
for the desired display.
d. Using the graticule, measure the vertical amplitude
(in div) from the reference line to the point to be measured.
e. Voltage level equals measured amplitude (in div) multi 
plied by the deflection factor.
Voltage Comparison
For applications in which the signal voltage is to be compared
to some signal reference, it may be desirable to establish a
different deflection factor than those available with the
VOLTS/DIV switch. A deflection factor conversion factor,
based on a specific reference amplitude is established as
follows:
a. Apply a reference signal of known amplitude to the input.
b. Adjust the display amplitude to an exact number of
graticule div using the VOLTS/DIV switch and its VARI 
ABLE control. Do not change this setting after the reference
has been established.
c. Deflection factor conversion constant equals:
Reference Signal Voltage
VOLTS/DIV setting x Display Amplitude (in div)
314 Operators
15

Tektronix 314 Specifications

General

Brand	Tektronix
Model	314
Category	Test Equipment
Language	English