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Appendix E: Tektronix TDS 1002B Oscilloscope

201058

Vertical Sections To the right of the option buttons are

knobs and buttons that control the vertical portions of the graph

(see Figure E.3). Typically the display shows a graph of voltage

(vertical) vs. time (horizontal). This scope has two channels, so

the vertical section is divided into two sub-sections with identi-

cal controls for each input. The inputs are called Channel 1 (CH

1) and Channel 2 (CH 2). The scale factor for each input is de-

termined by the corresponding VOLTS/DIV knob. The vertical

location of zero volts is determined by the corresponding POSI-

TION knobs. The scale factors and the zero level for the channel

traces are set independently; therefore the graph axes cannot

show values in physical units (volts). Rather, the graph is dis-

played on an 8 × 10 grid with units called divisions (div). Typi-

cally each division is about one centimeter.

The VOLTS/DIV knob controls the sensitivity and is similar to the

range switch on a multimeter. If the knob is set to 0.5 volts/div, a

2 V signal will be displayed as 4 divisions high, since 4 div × 0.5 V/div = 2 V. These settings

appear in the lower lhs of the display. For optimum resolution, you should adjust the VOLTS/DIV

so that the signal displayed is at least 3 divisions peak-to-peak.

The maximum display using a 1X probe is 40V peak-to-peak, corresponding to 5V/div.

The traces of the two channels generally look identical on the screen, so the symbols 1 and 2

on the lhs of the display show the position of zero volts for each trace. If you are unsure which

trace is which, moving a POSITION knob will immediately identify the corresponding trace.

MATH MENU

On the line separating the two channels is the MATH MENU button, which produces menus on

the screen next to the option buttons. The MATH MENU is used to display combinations of CH 1

and CH 2 (+, −, ×) and Fourier transforms (FFT) of either signal.

CH MENU

The CH 1 MENU and CH 2 MENU buttons produce menus that allow controlling how

the corresponding input is modified and displayed. Also, pushing these menu

buttons toggles the display/non-display of the corresponding signal. The menu

items are described in the next paragraphs.

Coupling

The top menu item in CH 1 and CH 2 menus, is Coupling, with options: DC, AC,

Ground. These options control how the signal supplied to the BNC input is con-

nected (coupled) to the scope’s voltage measuring circuits. The Ground option

means the scope ignores the input and displays a horizontal line at zero volts

(ground) — this allows you to locate and POSITION the zero-volt reference line for

that channel. When AC is selected a capacitor is connected between the input and

the scope’s electronics. This capacitor prevents any DC voltage from entering the

scope’s circuits, effectively subtracting any DC offset and displaying only the AC

signal oscillating around a mean of zero volts. The usual selection for Coupling is

DC, which means the signal is displayed unmodified.

Figure E.3: Vertical Control

Section

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