Tektronix 067-0700-00 User manual

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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
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067-0700-00
Figure 1. 7D12 Calibration Fixture.
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Section 1-067-0700-00
CHARACTERISTICS
ELECTRICAL
SIGNAL INPUTS
Vertical Display
Termination Resistance 51 n, within 5%, 250 mW
In 7D12
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Scale Factor
Attenuator Setting
1 X 87 mV/div
2X
174 mV/div
5X 435 mV/div
Accuracy within 3%
Bandwidth ~100MHz
Aberrations +5%, -5%, total not to exceed 10% peak to peak
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Gate Waveform
r
In 7D12
Termination Resistance 50 n, within 1.5%, 190 mW
Bandwidth
~
100 MHz
A/D Direct Input
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Range +2.0 V to -2.0 V
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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
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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
1%
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)
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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.
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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.
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Theory of Operation-067-0700-00
IN
OUT
3-2
GATE
WAVEFORM
DIRECT
INPUT
VERTICAL
DISPLAY
DIRECT
l!\IPUT
READOUT
CALIBRATION
ATTEN
READOUT
CHECK
AID
DIRECT
INPUT
~
!BLACK!
J1
~
J4
~
------------------------------~ 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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