Tektronix 067-0700-00 Bedienungsanleitung

[

Tektronix, Inc.

P.O. Box 500

Beaverton, Oregon 97005

070-1836-00

TEKTRONI»

INSTRUCTION MANUAL

Serial Number

First Printing JUNE 1974 ·

by Tektronlx, tnc.,

,Be"'vert(),i:ii:

inted in the United States of America. All

":rights re~~rved.Contents oft.his publication may not.

be<'~epte)ducedin any form without permission of

Tektrortix, Inc.

· lX.

products covered

•.tpatentspending.

067-0700-00

TABLEOFCONTENTS

SECTION 1 Characteristics

SECTION 2 Operating Instructions

r SECTION 3 Theory of Operation

SECTION 4 Maintenance

f" SECTION 5 Performance Check

SECTION 6 Diagrams

SECTION 7 Electrical Parts List

SECTION 8 Mechanical Parts List

067-0700-00

Figure 1. 7D12 Calibration Fixture.

Section 1-067-0700-00

CHARACTERISTICS

ELECTRICAL

SIGNAL INPUTS

Vertical Display

Termination Resistance 51 n, within 5%, 250 mW

In 7D12

Scale Factor

Attenuator Setting

1 X 87 mV/div

174 mV/div

5X 435 mV/div

Accuracy within 3%

Bandwidth ~100MHz

Aberrations +5%, -5%, total not to exceed 10% peak to peak

Gate Waveform

In 7D12

Termination Resistance 50 n, within 1.5%, 190 mW

Bandwidth

100 MHz

A/D Direct Input

Range +2.0 V to -2.0 V

Input Resistance 1 M.s1within 1%

Accuracy within 1%

Maximum Non-Destruct Input Voltage 1 kV peak between input connectors. 1 kV peak

between either connector and ground.

Common Mode Rejection Ratio (In 7D 12) 80 dB at 60 Hz (using 100 n unbalance in either input

connector)

Normal Mode Rejection Ratio (In 7D12) 50 dB at 60 Hz

1-1

Characteristics-067-0700-00

SIGNAL OUTPUT

Readout Calibration

Output Current

Temperature Range

Altitude

Height

Width

Length

Weight

1-2

-0.9 mA, within

with +15.0 V mainframe supply.

Varies linearly by -60µA/V with.the +15 V supply

ENVIRONMENTAL

0°C to 65°C

To 15,000 foot

PHYSICAL

6.5 cm (2.6 inches)

6.4 cm (2.5 inches)

20.4 cm (8.0 inches)

227 grams (8 ounces)

(

Section 2-067-0700-00

OPERATINGINSTRUCTIONS

FUNCTIONS OF CONTROLS AND CONNECTORS

VERTICAL DISPLAY Connector

Provides a 50 .Q terminated direct input to the 7D12 vertical display.

GATE WAVEFORM Connector

Provides a direct input to the 7D12 50 .Q terminated gate waveform display.

Readout Mode Switch

READOUT CALIBRATION-Provides the channel 2 column with a constant current for the B's reference level, to

display a row of ten B's.

ATTEN READOUT CHECK-Allows the attenuator 1-2-5 readout to be displayed in channel 2.

A/D DIRECT INPUT Connectors

Provides a direct input for signals to the 7D12 A/D converter circuitry, and displays the readout in channel 1.

® 2-1

[

Section 3-067-0700-00

THEORYOFOPERATION

INTRODUCTION

The following is a brief discussion of the basic operation of the major circuits in the 7D12 Calibration Fixture (067-

0700-00). The simplified block diagram in Figure 2 and on the schematic is provided to aid in understanding this discussion.

GATE WAVEFORM DIRECT INPUT

The gate waveform signal is routed directly from connector J1 to the 7D12 (50-ohm terminated input) gate waveform

display circuit.

VERTICAL DISPLAY DIRECT INPUT

The vertical display signal is routed from connector J4 to the 7D12 vertical display circuit. Resistor RBprovides

proper signal termination and R7 provides damping.

ATTENUATOR READOUT CHECK

This calibration fixture provides an interconnection from the 7D12 attenuator switch to the readout system. The

readout system displays the amount of attenuation (1, 2, or 5 times) as determined by the attenuator switch setting.

READOUT CALIBRATION

Integrated circuit U16 provides a precise 900 microampere current through the 7D 12 to the readout system. When

the proper calibration current is present, ten B's appear in the channel 2 readout position (lower readout).

U16 is an operational amplifier used as a current converter. Negative feedback, provided through R14, attempts to

stabilize the negative input with the positive input level. Loading variations (from about Oto -300 millivolts), control the

positive input level with positive feedback through R18.

A/D DIRECT INPUT

Input signals are routed to connectors J21 (positive) and J24 (negative). A 1 megohm input termination is provided

by R23 and R24. Resistor R22 protects the 7D12 input against excessive input voltage. Signal filtering is provided by C24

and C25. Decimal-point encodin9 for channel 1 is provided by R28 and R32. The V suffix is encoded by R30 and H34.

® 3-1

Theory of Operation-067-0700-00

OUT

3-2

GATE

WAVEFORM

DIRECT

INPUT

VERTICAL

DISPLAY

DIRECT

l!\IPUT

READOUT

CALIBRATION

ATTEN

READOUT

CHECK

AID

DIRECT

INPUT

!BLACK!

------------------------------~ b10 GATE DISPLAY

-------------------11TERl~E~riONI t-------->~b20 SIGNAL DISPLAY

r-----------------------------__:~b6 1, 2, 5 SCALE

FACTOR DISABLE

S11 OUT u COMPENSATED

PRECISION

CURRENT

SOURCE

1------- U16

b12 CH2COLUMN

J21 a1 VHIGH

1 MEGOHM INPUT a2 GUARD

TERMINATION

J24 AND FILTER. b2 FGUARD

b1 VLOW

b14 CH 1 COLUMN

READOUT

ENCODING b15 CH 1 ROW

RESISTOR

NETWORK a13 TSB

.a20 TS 1

1836-2

Figure 2. Block Diagram.

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