Tektronix 2445 User Manual

Section 6—2445 Operators
BASIC APPLICATIONS
The TEKTRONIX 2445 Oscilloscope provides an
accurate and flexible measurement system. After becoming
familiar with the controls, indicators, operating consider
ations, and capabilities of the instrument, an operator can
easily develop his own convenient methods for making
particular measurements. The information in this section is
designed to enhance operator understanding and to assist in
developing efficient techniques for making your specific
measurements. Recommended methods for making the
basic types of measurements with the 2445 are described
in the procedures contained in this section.
When a procedure first calls for presetting instrument
controls and obtaining a baseline trace, refer to "Initial
Setup" in Section 5, "Operator's Checks and Adjustments."
INDEX OF PROCEDURES
Voltage Measurement ........................................................... 6-1
Voltage Ratio........................................................................6-2
Algebraic Addition and Eliminating
Common-mode Signals ........................................................ 6-3
Time Interval........................................................................6-4
Frequency.............................................................................6-4
Time Difference Between Two Time-related Pulses . . . 6-5
Time Ratio.............................................................................6-5
Phase Difference Between Two Time-related Signals. . . 6-6
Small-angle Phase Difference .............................................. 6-6
Delayed-sweep Operation ................................................... 6-7
VOLTAGE MEASUREMENT
The 2445 has a built-in Delta Volts function that
reduces voltage measurement to a simple process. The
following procedure may be used to make voltage measure
ments between any two points on a waveform (e.g., ac
peak-to-peak voltages, instantaneous voltage levels, and
pulse heights).
1. Preset instrument controls and obtain a baseline trace.
2. Apply the signal to either the CH 1 OR X or the CH 2
input connector and select the VERTICAL MODE switch
to display the channel used.
3. Set the appropriate VOLTS/DIV switch to display
between three and eight divisions of the waveform, ensuring
that the VOLTS/DIV VAR control is in the calibrated
detent.
4. Adjust the A TRIGGER LEVEL control to obtain a
stable display.
5. Set the A SEC/DIV switch to a position that displays
a few cycles of the waveform.
6. Activate the Delta Volts measurement function by
momentarily pressing in the AV button. Observe that two
horizontal cursors and a AV readout appear on the screen.
The Reference cursor can be positioned by the A REF
OR DLY POS control, and the Delta cursor can be posi
tioned by the A control. Voltage difference between the
two cursors is displayed by the readout located in the
upper right-hand corner of the screen. Changing the
VOLTS/DIV switch position automatically changes the
readout scale. This scale also automatically compensates for
the attenuation factor of attenuator probes equipped with
readout encoding.
7. Position the two cursors on the desired points of
the waveform (see Figure 6-1).
DELTA CURSOR INSTANTANEOUS
Figure 6-1. Instantaneous dc levels.
6-1

Tektronix 2445 Specifications

General

Brand	Tektronix
Model	2445
Category	Test Equipment
Language	English