Tektronix 7a11 User manual

INSTRUCTION
MANUAL
Serial Number ?(a727
Tektronix, Inc.
S.W. Millikan Way P. 0. Box 500 Beaverton, Oregon 97005 Phone [phone] Cables: Tektronix
070-0984-00 1269

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TABLE OF CONTENTS
SECTION 1 SPECIFICATION
Introduction
Electrical
Deflection Factor
Gain
Frequency Response
Maximum lnputVoltage
lnput Rand C
Maximum Gate Current
Noise
DC Drift
DriftWith AmbientTemperature
Trace IDENTIFY
OFFSET Range
OFFSET OUT
50 SZ TerminationIAdapter
Environmental
Probe
Temperature
Altitude
Vibration
Shock
Plug-In
Altitude
Physical
Finish
Dimension
Weight
SECTION
2 OPERATING INSTRUCTIONS
General
Plug-InInsertion/Removal
Probe RemovalIStorage
External Controlsand Connectors
Accessories Information
First Time Operation
STEP ATTEN BAL Adjustment
IDENTIFY
BANDWIDTH
GAIN
POLARITY
OFFSET
Probe Operation
UnscaledDeflectionFactors
lnputCapacitance

TABLE OF CONTENTS (cont)
SECTION 3 CIRCUIT DESCRIPTION
Block Diagram Description
Probe Circuit Description
Input Amplifier
Output Amplifier
Offset Generator
VoltsIDiv Switch and Readout
Power Supplies and Output Connectors
SECTION
4 MAINTENANCE
PreventiveMaintenance
General lnformation
Cleaning
Visual Inspection
Lubrication
Transistor and IntegratedCircuit Checks
Recalibration
Troubleshooting
Test Equipment
General Techniques
TroubleshootingBasic Components
TroubleshootingChart
Corrective Maintenance
Parts Procurement
Screwdriver Requirements
Soldering Equipmentand Techniques
Probe Data
Plug-InUnit Data
Circuit Board Illustrations
SECTION
5 PERFORMANCECHECKICALIBRATION
General
CalibrationProcedure lnstructions
PerformanceCheck lnstructions
CalibrationIndex and Record lnstructions
Equipment Required
DetailedProcedure
SECTION
6 ELECTRICALPARTS LIST
Abbreviations and Symbols
PartsOrdering Information

TABLE OF CONTENTS (cont)
SECTION 7 DIAGRAMS
Electrical
MechanicalParts List Illustrations
Accessories
SECTION
8 MECHANICALPARTS LIST
MechanicalParts List Information
CHANGE INFORMATION
Abbreviations and symbols used inthis manual are
based on or taken directly from IEEE Standard
260 "Standard Symbols for Units", MIL-STD-12B
and other standards of the electronics industry.
Change information, ifany,
is located at the rear of
this manual.
iii

Fig. 1-1. 7A11 Amplifier.
8

SECTION 1
Introduction
Changeinformation, ifany, affecting thissectionwillbe found at therear of rhe manual.
The 7A11 Amplifier is a versatile plug-inamplifier unit
which provides a DC to 150 MHz bandwidth with Tek-
tronix 7700-Series Oscilloscopes. When desired, the upper
frequency -3 dB point can be limited to 20 MHz by a
front-panelswitch.
Calibrated deflection factors of from 5 mV to 20 V per
division are provided in 1-2-5sequence. In addition, avari-
able gain control makes
it possible to set the amplifier to
any deflection factor between 5 mV and 50V per division.
A permanently attached probe provides low-inputcapa-
citance (2.0 pF at 2 Vldivision, 5.8 pF at 5 mVldivision)
while maintaining high input resistance (1 Ma). BNC-
connectors can be attached to the probe through a probe-
tip to BNC-female adapter. This adapter serves as the
probe's input connector when the probe is stored, but can
be attached to the probe tip whether or not the probe
is
stored intheplug-inunit.
A 50 terminationladapter (standard accessory) per-
mits impedance matching for use of the probe in 50
environments. When the terminationladapter is used, alow
standing wave ratio (VSWR) can be expected. The VSWR
can be further reduced by insertinga 2X attenuator inthe
signal path ahead of the 50
St terminationladapter. Approx-
imate values of VSWR which can be expected under both
conditionsare shown in Fig. 1-4.
The performancespecification of the 7A11 Amplifier is
described in detail in Table 1-1. The specification is valid
under thefollowing conditions:
Calibrationmust have been performed at an ambient
temperaturebetween +20°c and +30°c.
TABLE 1-1
7Al I Amplifier Specification
Characteristic
ELECTRICAL
Gain Ratio
Accuracy
Uncalibrated
PerformanceRequirement
DeflectionFactor
(VO
LTSID I V)
Calibrated Range
Within 2% of GAIN adjusted at 0.1
Vldiv
5 mVldiv to 20 Vldiv; 12 steps in
5,10,20 sequence
Continuously variable; extends de-
flection factor to at least 50 Vldiv
Permits adjustment of deflection
factor at 0.1 Vldiv for all Oscillo-
scopes
Frequency Response
(8Division Reference)
Bandwidth, Direct
Coupled Input
DC to 90 MHz with 7500-Series
Oscilloscope
FULLMode DC to 150 MHz with 7700-Series
Oscilloscope
20 MHz Mode
Risetime
1 2.4 ns or less with 7700-Series
DC to 20 MHzwithin
2 MHz
Capacitive Coupled
Lower Frequency
-3 dB Limit
1 oscilloscope
15 Hz or less
1 3.9 ns or less with 7500-Series
Operation must be within any specifiedenvironment,
in
a calibrated Oscilloscope, after twenty minutes of
warmup.
REV. MAR 1974
Risetime (6 Div
Reference)
Oscilloscope
12011s or less 5 mV-20Vldiv with
7904 oscilloscope.

Specification-7Al1
TABLE 1-1 (cont)
TABLE 1-1(cont)
Maximum lnputVolt-
age With or Without
AC Coupler Installed
Characteristic
DC
+ Peak AC
Performance Requirement
200 V; AC component not to ex-
ceed amplitude specified under AC
AC, continuous
wave
5 mV thru
50 mV
0.1 V thru
1 v
2 V thru
20 v
200 V peak to 50 kHz; see Fig. 1-2
for amplitude derating due to fre-
quencies above
50 kHz
200 V peak to 40 MHz; see Fig. 1-2
for amplitude derating due to fre-
quencies above
40 MHz
200 V peak to 70 MHz; see Fig. 1-2
for amplitude derating due to fre-
quencies above
70 MHz
DC, Capacitive
Coupled (AC
Coupler Installed)
lnput Rand C
Resistance
1 M!2 within 1%
Capacitance
5 mVldivthru
50 mVldiv Approximately
5.8 pF
0.1 Vldiv thru
1 Vldiv Approximately
3.4 pF
2 Vldiv thru
20 Vldiv
MaximumGate
Current
Noise (Tangentially
measured in FULL
Mode)
Approximately
2.0 pF
0.25 nA or less at 25"~,increasing
to
1.2 nA or less at 50"~
0.1 division (maximum), measured
in7000-SeriesOscilloscope
Characteristic
DC Drift
DriftWith Time
(Ambient Temper-
atureand Line Vol-
tage Constant)
Short Term
LongTerm
DriftWith Ambient
Temperaturechange
(LineVoltageConstant)
Plug-InOnly
Probe Only
Trace IDENTIFY
OFFSET Range
5 mV1div thru
50 mVldiv
0.1 Vldiv thru
1 Vldiv
2 Vldiv thru
20 Vldiv
OFFSET OUT
Range
Ratio of Offset
Range toOFFSET
OUT
5 mV1divthru
50 mVldiv
0.1 Vldiv thru
1 Vldiv
2 Vldiv thru
20 Vldiv
Source Resistance
Performance Requirement
0.1 division or less during any 1
minute interval within 1 hour after
20 minutesfrom turn-on
0.3 division or less duringany hour
after
20 minutesfrom turn-on
200 ~v/"c or less
200 ~v/"c or less
0.2 to 0.3 division upward trace
shift
+I V to -1 V
+20 V to -20 V
+400 V to -400 V
+I V to -1 V (nominal)
1 : 1 within 1% plus 0.5 mV at OFF-
SET OUT jack
20: 1 within 1.5% plus 0.5 mV at
OFFSETOUT jack
400: 1 within
2% plus 0.5 mV at
OFFSET OUT jack
500 i-2 within 3%

Fig. 1-2. Frequency versus maximum input amplitude derating graph.
TABLE 1-1 (cont)
1000 v
200 v
100 v
Peak
Voltage
10 v
Characteristic
50 52 Termination1
Adapter
Input Impedance
1 v
--
PerformanceRequirement
I
50 52 within 1%
10 kHz 100 kHz 100 MHz I GHz
MHz CW Frequency lo MHz
Power Rating
ENVIRONMENTAL
1 Watt
Probe
Temperature
Non-operating
Operating
Altitude
I
Operating
Non-operating
Vibration
To
50,000 feet
To
15,000 feet
l5 minutes along each axis at 0'025
Fig. 1-3. 7All maximum gate current versus Probe ambient tem-
inch p-p displacement (3.9 g's at
perature in "non-stored" mode. To determine maximum gate cur-
55 c/s) 10 to 55 to 10 c/s in rent with Probe stored, add +ll°C to Probe ambient temperature.