NAVAIR 17-20AW-105
TECHNICAL MANUAL
AW-105
INSTRUMENT CALIBRATION PROCEDURE
CURVE-TRACER
TEKTRONIX
576
THIS PUBLICATION SUPERSEDES NAVAIR 17-20AW-105
DATED 1 DECEMBER 2000
DISTRIBUTION STATEMENT C. DISTRIBUTION AUTHORIZED TO U.S. GOVERNMENT AGENC IES AND THEIR
CONTRACTORS TO PROTECT PUBLICATIONS REQUIRED FOR OFFICIAL USE OR FOR ADMINISTRATIVE OR
OPERATIONAL PURPOSES ONLY. OTHER REQUESTS FOR THIS DOCUMENT SHALL BE REFERRED TO
MEASUREMENT SCIENCE DIRECTORATE, CORONA DIVISION, NAVAL SURFACE WARFARE CENTER,
P.O. BOX 5000, CORONA, CA 92878-5000.
DESTRUCTION NOTICE - FOR UNCLASSIFIED, LIMITED DOCUMENTS, DESTROY BY ANY METHOD
THAT WILL PREVENT DISCLOSURE OF CONTENTS OR “RECONSTRUCTION OF THE DOCUMENT.”
AW-105
PUBLISHED BY DIRECTION OF COMMANDER NAVAL AIR SYSTEMS COMMAND
1 AUGUST 2002
NAVAIR 17-20AW-105
LIST OF EFFECTIVE PAGES
The purpose of this list is to identify the pages in this document affected by any technical content changes made since the
previous release of the document.
NOTE: On a revised page, with the exception of the Title, the A, and the i pages, the technical changes are indicated by a vertical
line in the outer margin of the page.
Page
No. **
Title 0
A 0
i 0
1 to 29 0
Revision*
Page
No. **
Revision*
Page
No. **
Revision*
A
*Zero in this column indicates an original page.
“R” in this column indicates a revised page.
**All pages not listed are blank pages.
NAVAIR 17-20AW-105
TABLE OF CONTENTS
Section Page
1 Introduction and Description ................................................................................................................... 1
2 Equipment Requirements......................................................................................................................... 5
3 Preliminary Operations............................................................................................................................ 6
4 Calibration Process .................................................................................................................................. 6
4.1 Horizontal and Vertical CRT Gain Tests ............................................................................................. 6
4.2 Horizontal and Vertical Displayed Noise Tests.................................................................................... 8
4.3 Display Offset and CAL Pushbutton Tests........................................................................................... 9
4.4 Horizontal Display Accuracy Tests ...................................................................................................... 11
4.5 Vertical Display Accuracy Tests.......................................................................................................... 12
4.6 Step Amplifier Gain Tests.................................................................................................................... 15
4.7 Step Generator and Offset Multiplier Accuracy Tests ......................................................................... 16
4.8 Step Generator Tests ............................................................................................................................ 19
4.9 Collector Supply Tests......................................................................................................................... 20
Navy Calibration Checklist...................................................................................................................... 23
ILLUSTRATIONS
Figure Page
1 TI CRT Graticule Lines........................................................................................................................... 8
2 Vertical Display Accuracy Test Configuration........................................................................................ 14
TABLES
Table Page
1 Calibration Description............................................................................................................................ 1
2 Equipment Requirements......................................................................................................................... 5
i
NAVAIR 17-20AW-105
SECTION 1
INTRODUCTION AND DESCRIPTION
1.1 This procedure describes the calibration of the Tektronix 576 Curve-Tracer. The instrument being calibrated is referred
to herein as the TI (Test Instrument).
1.2 All comments concerning this procedure should be directed to the Measurement Science Directorate, Corona Division,
Naval Surface Warfare Center, P.O. Box 5000, Corona, CA 92878-5000.
1.3 This procedure includes tests of essential performance parameters only. Any malfunctio n noticed during calibration,
whether specifically tested for or not, should be corrected.
Table 1. Calibration Description
TI
Characteristics
Collector supply sweep
modes
Voltages Ranges: 15, 75, 350, and 1500 V
Step generator current or
voltage steps inc lud i ng
offset
Normal AC: At line fre q uency
positive- or negative-going full
wave rectified AC
DC: Positive- or negative-going DC
Ripple: no load, 2% or less of
voltage; or 0.1% or less of full range
voltage
Tolerance: ±35% and -5% peak open
circuit voltages on all ranges
Series resistance: 0.3, 1.4, 6.5, 30,
140, and 650 Ω; 3, 14, 65, and
300 kΩ; 1.4 and 6.5 MΩ
Tolerance: ±5% or 0.1 Ω
Incremental tolerance: ±5% between
any two steps, without the 0.1X
STEP MULT button pressed; and
within ±10% with the 0.1X STEP
MULT button pressed
Absolute tolerance: ±2% of total
output, inc luding any a mount of
offset; or ±1% of AMPLITUDE
switch setting, whichever is greater
Performance
Specifications
Test
Method
Tested by inference.
Not tested.
Tested by observing the CRT
display and by measuring
the TI output with a DVM.
Tested by observing the CRT
display.
Step current o r voltage
amplitudes
OFFSET MULT control
range
One time (or 0.1 times with the STEP
MULT button pressed) the
AMPLITUDE switch setting
0 to 10 times AMPLITUDE switch
setting, either aiding or opposing the
step generato r polarit y
1
NAVAIR 17-20AW-105
TI
Characteristics
Current mode Amplitude range: 200 mA to 50 nA,
in a 1-2-5 sequence
Maximum current: 20 times
AMPLITUDE switch setting, except
10 times switch setting when switch
is set to 200 mA, and 15 times
switch setting when the switch is set
to 100 Ma
Maximum voltage: 10 V min.
Maximum opposing offset current:
10 times the AMPLITUDE switch
setting, or between 10 mA and
20 mA, whichever is less
Maximum opposing voltage: between
1 and 3 V
Ripple plus noise: 0.5% or less of
AMPLITUDE switch setting or
1 nA, peak to peak
Voltage mode Amplitude range: 50 mV to 2 V, in a
1-2-5 sequence
Maximum voltage: 20 times
AMPLITUDE switch setting
Maximum current: at least 2A at
10 V or less decreasing linearly to
10 mA at 40 V
Maximum opposing offset voltage:
10 times the AMPLITUDE switch
setting
Maximum opposing current: 5 to
20 mA
Ripple plus noise: 0.5% or less of
AMPLITUDE switch setting; or
2 mV p-p
Performance
Specifications
Test
Method
Tested by observing the CRT
display.
Step rates 1 times .5 X, 2 times NORM, and
4 times 2 X line frequency
Pulsed steps
Number of steps Range from 1 to 10 as selected by the
2
Steps 80 µs wide within +20% to
-5%; or 300 µs wide withi n + 5 % to
15%
NUMBER OF STEPS switch
NAVAIR 17-20AW-105
TI
Characteristics
Display amplifiers
Display tolerance (% of
highest on-screen value)
Normal and DC collector
supply modes
Vertical collector
External vertical
(through interface)
Horizontal collector volts 2% 3% 4% 3%
Horizontal base volts 2% 3% 4% 3%
External horizontal
(through interface)
Leakage collector supply mode
Vertical emitter current
(VERTICAL switch set
between 10 nA and 2 mA)
Display magnified (DISPLAY
OFFSET selector switch set to
either VERT X 10 or HORIZ
X 10) and offset between
100 and
40 div
2% 3% 4% 3%
2% 3% 4% 3%
2% 3% 4% 3%
2%
±1 nA
Not applicable
Performance
Specifications
35 and
15 div
3%
±1 nA
10 and
0 div
4%
±1 nA
Display
Unmag
nified
3%
±1 nA
5%
±1 nA
Test
Method
Tested by observing the CRT
display and by measuring the
output on a DVM.
Tested by observing the CRT
display.
Vertical emitter current
(VERTICAL switch set to
5 nA, 2 nA, or 1 nA)
Horizontal collector or base
volts VERTICAL switch set
to: 1 µA or more
100 nA, 10 nA, or 1 nA
500 nA, 50 nA, or 5 nA
200 nA, 20 nA, or 2 nA
Step generator display
Vertical
Horizontal 3% 4% 5% 4%
Reflection factors
Vertical
Collector current
2%
±1 nA
Not applicable
Not applicable
Not applicable
3% 4% 5% 4%
1 µA/div to 2 A/div in a 1-2-5 sequence
3%
±1 nA
4%
±1 nA
3% plus 0.025 V per
vertical di v
3% plus 0.025 V per
vertical di v
3% plus 0.025 V per
vertical di v
3%
±1 nA
Tested by observing an output on an
external oscilloscope.
Tested with an external 10A source
on the 1 and 2A ranges.
Emitter current 1 nA/div to 2 mA/div in a 1-2-5 sequence
3
NAVAIR 17-20AW-105
TI
Characteristics
Performance
Specifications
Test
Method
Step generator 1 step/div
Horizontal
Collector volts 50 mV/div to 200 V/div in a 1-2-5 sequence Tested by observing the CRT
display.
Base volts 50 mV/div to 2 V/div in a 1-2-5 sequence
Input impedance
At least 100 MΩ with the HORIZONTAL
switch set to 50, 100, and 200 mV BASE;
1 MΩ within 2% with the switch set to
0.5 V, 1V, and 2 V
Step generator 1 step/div
Maximum displayed noise 1% or less, or the following depending on
the setting of the MAX PEAK VOLTS
Tested by observing the CRT
display.
switch:
Range
Vertical 15 V 75 V 350 V 1500 V
Collector
1 µA 1 µA 2 µA 5 µA
Emitter 1 nA 1 nA 2 nA 5 nA
Horizontal
Collector 5 mV 5 mV 20 mV 200 mV
Base 5 mV 5 mV 5 mV 5 mV
Calibration check 10 div vertical and horizontal deflection
with the DISPLAY OFFSET switch set to
Tested by observing the CRT
display.
NORM (OFF)
Tolerance: ±1.5% with the DISPLAY
OFFSET switch to X10 MAGN IFIER
(horizontal or vertical) the calibration spot
is within 0.5% of the zero spot (graticule
center) with CAL button depressed
PER HORIZ DIV 5 mV to 100 V
PER STEPS 5 nA to 2A and 5 MV to 20 V
B or gm PER DIV
1µ to 500 k
Power requirements Tested by inference.
Low
Medium
High
Line frequency
90 to 110 V
104 to 126 V
112 to 136 V
48 to 66 Hz
4
NAVAIR 17-20AW-105
SECTION 2
EQUIPMENT REQUIREMENTS
NOTES
Minimum use specifications are the principal parameters required for performance of the calibration, and are
included to assist in the selection of alternate equipment, which may be used at the discretion of the using
laboratory. Satisfactory performance of alternate items shall be verified prior to use. All applicable
equipment must bear evidence of current calibration.
The instruments utilized in this procedure were selected from those known to be available at Navy calibration
facilities and the listing by make or model number carries no implication of preference, recommendation, or
approval for use by other agencies. It is recognized that equivalent equipment produced by other
manufacturers may be capable of equally satisfactory performance in this procedure.
Table 2. Equipment Requirements
Item Minimum Use
2.1 Oscilloscope
Specifications
Sweep time: 50 µs/div
Triggering : + (plus)
Sensitivity: 0.05 to 5 V/div
Tektronix 7704A MOD 129G
with a 7B53A and a 7A26 or
7A12 plug in unit installed, or
Calibration
Equipment
547 or 545 series with a 1A1
plug in unit
2.2 DVM DV ranges: 10 V with an input impedance of
500 MΩ minimum; 100 and 1000 V ranges
Fluke 8350A, 8800A/AA,
887AB, or 883AB
Uncertainty: ±0.25%
2.3 Power supply 10A DC Hewlett-Packard
6259BOPT026 or 6433B
2.4 Resistor kit
1 and 10 Ω, 3 W; 10 MΩ, 1 W; 100 Ω, 0.5 W;
Local supply
1 and 10 kΩ, 0.25 W; 100 kΩ and 1 MΩ,
0.125 W; 25 and 250 kΩ, and 2.5 and 25 MΩ,
0.125 W
Uncertainty: ±0.25%
2.5 Protective box -- TI accessory
2.6 BNC male to dual binding
-- TI accessory
post adapter
2.7 Patch cords, and
-- Local supply
interconnecting cables
2.8 Current shunt 10 A DC
Uncertainty: ±0.5%
Leeds & Northrup 4360 or 4385
5
NAVAIR 17-20AW-105
SECTION 3
PRELIMINARY OPERATIONS
3.1 Ensure that all power switches are set to off, and set all auxiliary equipment controls as necessary to avoid da mage to the
equipment and so that dangerous voltages will not be present on output terminals when the power switches are turned on.
3.2 Connect the auxiliary equipment, and the TI, to the appropriate power source.
3.3 Ensure that the TI Line Voltage Selector Assembly (rear panel) Range Selector is positioned for M (medium) range, the
Voltage Selector is positioned for 115 V operation, and that the 60 Hz-50 Hz switch is set to 60 Hz.
3.4 Turn all power switches on, and allow a sufficient warm-up period for the equipment (the TI requires a 5 minute warm-up
time).
3.5 The Standard Test Fixture referred to in this procedure, is part of the TI from lower control panel.
SECTION 4
CALIBRATION PROCESS
NOTES
Unless otherwise specified, verify the results of each test and take corrective action whenever the test
requirement is not met, before proceeding.
If the TI is a 576 MOD 301W, all instructions pertaining to the Readout Assembly should be disregarded.
4.1 HORIZONTAL AND VERTICAL CRT GAIN TESTS
4.1.1 Set the TI controls as follows:
GRATICULE ILLUM control for graticule lines visible
READOUT ILLUM control for a visible readout
INTENSITY control for a visible spot
FOCUS control centered
VERTICAL switch to 5 mA COLLECTOR
DISPLAY OFFSET switch to NORM (OFF)
CENTERLINE VALUE switch to 5
HORIZONTAL switch to 2 V COLLECTOR
Vertical POSITION switch to Mid-range
Vertical FINE POSITION control centered
Horizontal POSITION switch to mid-range
6
Horizontal FINE POSITION control centered
DISPLAY INVERT pushbutton released
DISPLAY ZERO pushbutton released
CAL pushbutton released
MAX PEAK VOLTS switch to 15
PEAK POWER WATTS switch to 0.1
VARIABLE COLLECTOR SUPPLY control fully ccw
POLARITY switch to AC
MODE switch to NORM
LOOPING COMPENSATION control as is
NUMBER OF STEPS switch to 10
CURRENT LIMIT switch to 2 A
AMPLITUDE switch to 2 V
OFFSET ZERO pushbutton depressed
OFFSET MULT dial to 0.00 (fully ccw)
NAVAIR 17-20AW-105
STEPS pushbutton depressed
PULSED STEPS pushbuttons released
STEP FAMILY SINGLE pushbutton depressed
RATE NORM pushbutton depressed
POLARITY INVERT pushbutton released
STEP MULT .1X pushbutton released
LEFT-OFF-RIGHT switch to OFF
Terminal Selector switch to BASE TEM STEP GEN
CAUTION
TO AVOID BURNING THE TI CRT PHOSPHOR DURING THIS PROCEDURE, ALWAYS ADJUST
THE TI INTENSITY CONTROL FOR A DIM, BUT VISIBLE CRT TRACE OR SPOT.
4.1.2 Adjust the TI INTENSITY and FOCUS controls for a dimly lit, and well-defined spot of minimum size.
4.1.3 Set the TI POLARITY switch to +(NPN).
4.1.4 Adjust the TI Horizontal and Vertical POSITION switches and FINE POSITION controls to position the spot to the
zero horizontal and vertical CRT graticule lines (see Figure 1).
7
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