Tektronix 7D15 User manual

Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon
070-1433-00
Product Group 42
97077
Tektronix
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
INSTRUCTION MANUAL
Serial Number
First Printing SEP 1974
Revised APR 1982

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Section 1
Section 2
TABLE OF CONTENTS
SPECIFICATION
Introduction. ...is.cscmsnswaws aa va eas
Electrical Characteristics ............
Environmental Characteristics........
Physical Characteristics.............
_ OPERATING INSTRUCTIONS
Installation...................0000.
Front Panel Controls and Connectors .
Modes of Operation................
Operation and Checkout
Page
1-1
1-1
17
1-7
2-1
2-2
2-7
2-10
THE FOLLOWING SERVICING INSTRUCTIONS
ARE FOR USE BY QUALIFIED PERSONNEL ONLY.
TO AVOID PERSONAL INJURY, DO NOT PERFORM
ANY SERVICING OTHER THAN THAT CONTAINED
IN OPERATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO.
Section 3
Trigger Input Amplifiers
CIRCUIT DESCRIPTION
Introduction... 2... 0... 0.0.00... c eee
Block Diagram Description
General. 2s caisieiareirmaas ag an ae
Time Base.......... 0... ..0000 00
Arm Inputs
Reset Circuitry
REV NOV 1981
Section 3
Section 4
Section 5
Section 6
Section 7
Section 8
Section 9
CIRCUIT DESCRIPTION (Cont’d)
Readout Theory ...... 6.0.6 ce eee ees
General........... 00.0.0... 00s
CH 1 Column and Row Data
CH 2 Column and Row Date
OVEMMIOW 22 ca ce ememiwyeaea casa ze
—5 V Supply
MAINTENANCE
Introduction... 0.0... eee
Preventive Maintenance.............
Troubleshooting
Corrective Maintenance.............
Component Replacement
Recalibration After Repair ...........
Repackaging for Shipment
CALIBRATION
Recalibration Interval ...............
Test Equipment Required............
Calibration Procedure
Index to Calibration Procedure .......
INSTRUMENT OPTIONS .
ELECTRICAL PARTS LIST
Abbreviations and Symbols
DIAGRAMS AND CIRCUIT BOARD
ILLUSTRATIONS
Symbols and Reference Designators
MECHANICAL PARTS LIST
CHANGE INFORMATION
7D15
Page
3-10
3-10
3-10
3-12
3-13
3-14
4-4
4-1
4-1
4-3
4-4
4-4
4-4
5-1
5-1
5-4
5-5
6-1

7D15
OPERATORS SAFETY SUMMARY
The general safety information in this part of the summary
is for both operating and servicing personnel. Specific
warnings and cautions will be found throughout the
manual where they apply, but may not appear in this
summary.
Terms In This Manual
CAUTION statements identify conditions or practices that
could result in damage to the equipment or other property.
WARNING statements identify conditions or practices
that could result in personal injury or loss of life.
Terms As Marked on Equipment
CAUTION indicates a personal injury hazard not im-
mediately accessible as one reads the marking, or a
hazard to property including the equipment itself.
DANGER indicates a personal injury hazard immediately
accessible as one reads the marking.
Symbols In This Manual
This symbol indicates where applicable
A cautionary or other information is to be
found.
Symbols As Marked on Equipment
DANGER — High voltage.
S Protective ground (earth) terminal.
J ATTENTION — refer to manual.
Power Source
This product is intended to operate from a power source
that will not apply more than 250 volts rms between the
supply conductors or between either supply conductor
and ground. A protective ground connection by way of the
grounding conductor in the power cord is essential for
safe operation.
Grounding the Product
This product is grounded through the grounding conduc-
tor of the power cord. To avoid electrical shock, plug the
power cord into a properly wired receptacle before
connecting to the product input or output terminals. A
protective ground connection by way of the grounding
conductor
in the power cord is essential for safe opera-
tion.
Danger Arising From Loss of Ground
Upon loss of the protective-ground connection, all
accessible conductive parts (including knobs and con-
trols that may appear to be insulating) can render an
electric shock.
Use the Proper Power Cord
Use only the power cord and connector specified for your
product.
Use only a power cord that is in good condition.
For detailed information on power cords and connectors,
see maintenance section.
Refer cord and connector changes to qualified service
personnel.
Use the Proper Fuse
To avoid fire hazard, use only the fuse of correct type,
voltage rating and current rating as specified in the parts
list for your product.
Refer fuse replacement to qualified service personnel.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in an
explosive atmosphere unless it has been specifically
certified for such operation.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product
covers or panels. Do not operate the product without the
covers and panels properly installed.
REV B JAN 1981

7D15
SERVICE SAFETY SUMMARY
FOR QUALIFIED SERVICE PERSONNEL ONLY
Refer also to the preceding Operators Safety Summary.
Do Not Service Alone
Do not perform internal service or adjustment of this
product unless another person capable of rendering first
aid and resuscitation is present.
Use Care When Servicing With Power On
Dangerous voltages exist at several points in this product.
To avoid personal injury, do not touch exposed connec-
tions and components while power is on.
@ JAN 1981
Disconnect power before removing protective panels,
soldering, or
replacing components.
Power Source
This product is intended to operate from a power source
that will not apply more than 250 volts rms between the
supply conductors or between either supply conductor
and ground. A protective ground connection by way of the
grounding conductor in the power cord is essential for
safe operation.

Fig. 1-1. 7D15 Universal Counter/Timer.
@ JAN 1981
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Section 1—7D15
introduction
SPECIFICATIONS
The 7D15 is a digital counter plug-in designed for use with all readout-equipped 7000-Series Oscilloscope mainframes.
It will function in any plug-in compartment; however, in the vertical compartment, a selectable display is internally con-
nected to the oscilloscope. When used in the horizontal compartment, mainframe triggers are available to the 7D15.
The 7D15 has eight modes of operation: Frequency—DC to 225 MHz direct, Frequency Ratio—O to 10° :1, Period—
10 ns to 10° s, Period Averaging— 10 ps resolution, TIM— 10 ns to 10° s, TIM Averaging—1 ns accuracy, Totalize—1 to 10°
events, Manual Stop Watch—to 10° s.
The electrical specifications listed in the Performance Requirement column are valid over the stated environmental range
for instruments calibrated at an ambient temperature of +20°C to +30°C and after a five minute warmup unless otherwise
noted. The information listed in the Supplemental Information column indicates typical instrument operation and is not to
be construed as a requirement for proper instrument operation.
TABLE 1-1
ELECTRICAL CHARACTERISTICS
Characteristics Performance Requirement
MEASUREMENT MODES
Frequency Mode
Range DC to 225 megahertz
Resolution 0.1 hertz minimum
" Accuracy Efreg (hertz) = + TB X Fi, + 1/T
Efreq (%) = 100% : TB ‘TKR, |
Period Mode
Range 10 nanoseconds to 10° seconds with averaging times of X1 to X1000 in decade
steps.
Resolution 10 picoseconds maximum.
1 Accuracy Eper (sec) = + TB X Pin ph t
& 8 Ke
Eper (%) = 100% +TB+ 71X10 KE Pex
Pin XM
Time Interval Mode
Range 6 nanoseconds to 10° seconds with averaging times of X1 to X1000.
Resolution 0.1 nanosecond usable.
‘ Accuracy (nominal) Ey, (sec) = TB X Pin + (Po, /A/M) + 10-9 + K
(Po.AVM) + 10-9 + K
Ey, (%) = 100% +TB a
in
The complete expression for Time Interval averaging depends on signal to noise
ratio and statistical distribution factors.
| Refer to Figs. 1-2 through 1-7 at the rear of this section for additional accuracy information.
REV. A, APR. 1976 11

Specifications—7D15
TABLE 1-1 (cont)
Characteristics
Performance Requirement
Frequency Ratio
CH B/EXT clock
Range 10-7 to 104
Totalize, CH B:
Range 0 to 108 counts
(Manual ON—OFF control or electrical control from CH A.)
Manual Stop Watch
Range
0 to 10° seconds
NOTE
Formulas given where TB (dec %) is the time base accuracy; P;,, is the period or time interval of the unknown
signal (whichever is applicable); M is the number of averages taken; Px is the measurement clock period; T is the
gate time; Fin is the frequency of the unknown signal; E npk is equal to the peak noise amplitude at the input to
the counter gate circuit; dv/dt is the signal slope at the input to the gate; K is equal to 2E npk/ dv/dt.
Characteristics
Performance Requirements
Supplemental Information
INPUT SIGNALS CHA &B
Frequency Range (CH only)
DC Coupled DC to 225 megahertz
AC Coupled 5 hertz to 225 megahertz
Sensitivity
CH A & B Inputs
TRIG SOURCE
100 millivolts peak-to-peak
Vertical deflection of:
0.5 divisions to 100 MHz
1.0 divisions to 225 MHz
or to the vertical system bandwidth,
whichever is less.
Input Resistance and
Capacitance
Approximately 1 megohm, 22 picofarads
Minimum Pulse Width
5 nanoseconds
Minimum gate “OFF” time
Between Samples During
TIM Averaging Operation
10 nanoseconds
Maximum Input Voltage
200 volts DC linearly derated to 20 volts
at 200 megahertz
E max = 20 + 180 (1 — Fj,(MHz)/200
1-2
REV. A, SEPT. 1977

TABLE 1-1 (cont)
Specifications—7D15
Characteristics Performance Requirements
Supplemental Information
Minimum Signal Period in
“PER” Mode
10 nanoseconds
Minimum CH A Input Pulse
Width in “FREQ B-CH A
Gate”’ Mode
10 nanoseconds
Triggering
Preset Position
Automatically triggers at 0 volts
Level Control
Range: (CH A and CH B)
Range: TRIG SOURCE
.1 V, +500 millivolts; 1 V, +5 volts; 10 V,
+50 volts
Approximately +2.5 divisions
Arming Inputs
Input R and C
Approximately 10 kilohm, 20 picofarads
Lead Time for Pulse to
become effective
5 nanoseconds
Lead Time to Negate
effect of “ARM”
5 nanoseconds
Minimum rise and fall rate dv/dt = 10 Volts per microsecond
Sensitivity A ARM
BARM
A logical “1” occurs with either no signal
applied or with +0.5 volt or greater. A
logical ’’0’’ occurs with less than +0.2 volt
@ 1 sink <0.2 milliampere
Logic “1° < 0.2 volt or no signal applied
Logic “0’’ > +0.5 volt
Maximum Operating Voltage
+10 volts to —5 volts
Maximum Input Voltage +15 volts
External Clock In
Input Requirements
Minimum Amplitude
Internal switch selectable
0.8 volt peak-to-peak sine wave or pulse
with 30% to 70% duty cycle
Coupling AC
1-3

Specifications—7D15
TABLE 1-1 (cont)
Characteristics
Performance Requirements
Supplemental Information
Maximum Input Voltage
+50 volts DC, 20 volts peak-to-peak
Frequency Range 1 megahertz +5%; Phase Lock Opera-
tional. 10 nanoseconds, 100 nanoseconds
clock available.
20 hertz to 5 megahertz; Phase Lock
Nonoperational.
RESET—Front Panel
Input R and C
Reset initializes the instrument. All
counters are affected, including averaging
circuits.
Approximately 10 kilohms, 30 picofarads
Input Requirements
Amplitude Logic “1” + 2 volts or greater
Logic “’0’’ + 0.5 volt or less
Pulse Width 2 500 nanoseconds
Maximum Operating
Input Voltage
+10 volts to —10 volts
Rise and Falltime
100 nanoseconds or less
Maximum Input Voltage + 15 volts
Reset (located on Rear
Interface B13)
Rise and Falltime
Negative-going transition TTL compatible
pulse
< 100 nanoseconds
Width
2 500 nanoseconds
Hold Signal (located on
Rear Interface B22)
Rise and Falltime
TTL compatible, negative-logic signal
< 200 nanoseconds
Propagation Delay for
Signal to become
effective or ineffective
< 100 nanoseconds
1-4