Tektronix TM 502A User manual

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Instruction Manual
Tektronix
/
TM502A
Power Module
070-6502-01
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to the Safety Summary prior to
performing service.
Pleasecheckforchangeinformationat the rear
ofthismanual.
First Printing: January I993
Revised Printing: December 1993

Instrument Serial Numbers
Each instrument manufactured by Tektronix has a serial number on a panel insert or tag, or stamped on the
chassis. The first letter in the serial number designates the country of manufacture. The last five digits of the
serial number are assigned sequentially and are unique to each instrument. Those manufactured in the
United States have six unique digits. The country of manufacture is identified as follows:
B010000
E200000
J300000
H700000
Tektronix, Inc., Beaverton, Oregon, USA
Tektronix United Kingdom, Ltd., London
Sony/Tektronix, Japan
Tektronix Holland, NV,Heerenveen, The Netherlands
Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit
alpha code to identify the country of manufacture (e.g., JP for Japan, HK for Hong Kong, ILfor Israel, etc.).
Tektronix, Inc., P.O.Box 500, Beaverton, OR 97077
Printed in U.S.A.
Copyright © Tektronix, Inc., 1993. All rights reserved. Tektronix products are covered by U.S. and foreign
patents, issued and pending. The following are registered trademarks: TEKTRONIX, TEK, TEKPROBE, and
SCOPE-MOBILE.
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WARRANTY
Tektronixwarrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the
date of shipment. Ifany such product proves defective during this warranty period, Tektronix, at its option, either will repair the
defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty
period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and
shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall
pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service
center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for
products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance
and care. Tektronixshall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by
personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from
improper use or connection to incompatible equipment; or c) to service a product that has been modified or integrated with
other products when the effect of such modification or integration increases the time or difficulty of servicing the product.
THIS WARRANTY IS GIVEN BYTEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER
WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR
REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR
BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES .

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Specification
Operating Instructions
Maintenance
TM 502A Instruction Manual
Contents
Operators Safety Summary .................................. .
Service Safety Summary .................................... .
Specification ............................................... .
Instrument Description .................................. .
Performance Conditions ................................. .
Operating Instructions ...................................... .
Power Source .......•...................................
Power Usage/ Loading Considerations ................... .
Line Voltage Selection/Fuse Replacement ................ .
Handleffilt Stand Installation ............................ .
Operating Temperature .................................. .
Power Modules .......•..................................
Family Compatibility .••..................................
Module Installation ....•..................................
Plug-in Retainer Clip Information ....................... .
Power-on Procedure .................................. .
Maintenance ..........•.....................................
Static Sensitive Components ............................ .
Cleaning ............................................... .
Obtaining Replacement Parts ............................ .
Preventive Maintenance and Calibration .................. .
Soldering Techniques ................................... .
Removing the Cabinet ................................... .
Removing the Circuit Board ............................. .
Removing the Voltage Selector/Fuse Holder Assembly .... .
Replacing the Series Pass Transistor ..................... .
Packaging information .................................. .
iii
V
1-1
1-1
1-1
2-1
2-1
2-1
2-1
2-3
2-4
2-4
2-4
2-4
2-5
2-5
3-1
3-1
3-2
3-3
3-3
3-4
3-4
3-4
3-5
3-5
3-6
i

Options
Replaceable Electrical Parts
Diagrams and Circuit Board Illustrations
Symbols ...••...........................................
Component Values ...................................... .
Graphic Items and Special Symbols Used in This Manual .. .
Component Locator Diagrams ........................... .
Replaceable Mechanical Parts
Index
6-1
6-1
6-2
6-2
ii Contents
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Symbols and Terms
TM 502A Instruction Manual
Operators Safety Summary
Pleasetake a moment to review these safety precautions. They are provided
for your protection and to prevent damage to the power module. This safety
information applies to all operators and service personnel.
These two terms appear in manuals:
• ~ statements identify conditions or practices that could result in
damage to the equipment or other property .
• IwARNtNGIstatements identify conditions or practices that could result in
personal injury or loss of life.
These two terms appear on equipment:
• CAUTIONindicates a personal injury hazard not immediately accessible
as one reads the marking, or a hazard to property including the equip-
ment itself.
• DANGERindicates a personal injury hazard immediately accessible as
one reads the marking .
This symbol appears in manuals:
®
Static-Sensitive Devices
These symbols appear on equipment:
DANGER
High Voltage Protective ground (earth)
terminal
This symbol indicates where
applicable cautionary or other
information is to be found .
ATTENTION
Referto
manual
iii

Specific Precautions
iv
Observe all of these precautions to ensure your personal safety and to
prevent damage to either the power module or equipment connected to it.
Power Source
The power module is intended to operate from a power source that will not
apply more than 250 Vrms between the supply conductors or between either
supply conductor and ground. A protective ground connection, through the
grounding conductor in the power cord, is essential for safe system opera-
tion.
Grounding the Power Module
The power module is grounded through the power cord. To avoid electric
shock, plug the power cord into a properly wired receptacle where earth
ground has been verified by a qualified service person. Do this before mak-
ing connections to the input or output terminals of the power module.
Without the protective ground connection, all parts of the power module are
potential shock hazards. This includes knobs and controls that may appear
to be insulators.
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.
Use the Proper Fuse
Toavoid fire hazard, use only the fuse specified in the parts list for your
product, matched by type, voltage rating, and current rating.
Do Not Remove Covers or Panels
Toavoid personal injury, do not operate the power module without the
panels or covers.
Take Antistatic Precautions
Wear an antistatic grounding wrist strap when working with the input con-
nectors on the power module.
Do Not Operate in Explosive Atmospheres
The power module provides no explosion protection from static discharges
or arcing components. Do not operate the power module in an atmosphere
of explosive gases.
Safety
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• TM 502A Instruction Manual
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 may exist at several points in this product. Toavoid
personal injury, do not touch exposed connections and components while
power is on.
Disconnect power before removing protective panels, soldering, or replacing
components .
Power Source
The power module is intended to operate from a power source that will not
apply more than 250 Vrms between the supply conductors or between either
supply conductor and ground. A protective ground connection, through the
grounding conductor in the power cord, is essential for safe system opera-
tion.
V

vi Safety
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Instrument
Description
Performance
Conditions
TM 502A Instruction Manual
Specification
The TM 502A is a two compartment-wide power module for the
TM 500-series of modular instrumentation. The power module accepts up to
two independently functional plug-in modules to form a compact, versatile,
and low-cost instrumentation system. The TM 502A is a basic power source
for plug-in modules of the TM 500 series family. It provides unregulated de
and ac supplies and nondedicated power transistors for plug-in usage.
The values listed in this section are valid only when the instrument is
operated at an ambient temperature between 0°cand +so0c.
1-1

Characteristics
+33.5 VDC
Tolerance8
PARDb
Maximum load
Maximum load ~i
-33.5 VDC
Tolerance8
PARDb
Maximum load
Maximum load ~i
+11.5 VDC
Tolerance8
Maximum load
Maximum load ~!
25 VAC (2 each compartment)
Range
Maximum load
Maximum floating voltage
17.5 V
Range
Maximum load
Maximum plug-in power0
draw from mainframe
Combined power drawc
Sharing Limitation
1-2
Table 1-1: Electrical Characteristics
Performance Requirements Supplemental Information
+23.7 V to +40.0 V
::52.5Vp-p
350mA
10 mA/µs
-23.7 V to -40.0 V
::52.5Vp-p
350mA
10 mA/µs
+7.6 V to +16.0 V
::52.5Vp-p
1.3 A, shared with 17.5 VAC
winding
20 mA/µs
25.0 Vrms+ 10%, -15% floating
25VA
350 Vpeak
20.5 V + 10%, -20% with
grounded center tap
30 VA, shared with 11.5 VDC sup-
ply
35 watts DC or 75 VAAc
VAAc + 2.1 (wattsoc) :s;75
Specification
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Table 1-1: Electrical Characteristics (Cont.)
Characteristics
Total Power from Mainframe
Total power drawc
(all compartments combined)
Series Pass Transistors
Type
Maximum dissipation
Source Power Requirements
Voltage Ranges
Line Frequency
Maximum Power Consumption
Fuse Data
100 V, 120 V ranges
220 V,240 V ranges
Miscellaneous
Maximum recommended plug-in
power dissipation
One-wide
Two-wide
Recommended adjustment interval
Performance Requirements
8Worst case: Low line with full load and high line with no load. These limits Include PARO.
Supplemental Information
VAAc + 2.1 (watts0c) :s;75
One NPN and PNP per compart-
ment
7.5 W each, 15 W total
Selectable:
100 V, 120 V,220 V,and 240 V
nominal line ± 10%
50/60 Hz
Approximately 120 W
1.0 A, 3 AG, slow blow, 250 V
0.5 A, 3 AG, slow blow, 250 V
10 to15 W
25to 35 W
1000 hours or 6 months
hPeriodic and Random Deviation. See National Electrical Manufacturers Association (NEMA) Standards Publication No. PY1-1972.
CAtnominal line voltage.
TM 502A Instruction Manual REVDEC 1993 1-3

Characteristics
Temperature
Operating
Non-operating
Humidityb
Altitude
Operating
Non-operating
Vibration
Shock
Bench Handling
Transportation
EMC
Electrical Discharge
awith plug-ins
1-4
Table 1-2: Environmental Characteristics 8
Description
0°c to +50°C
-55°C to +75°C
95% RH, 0°C to 30°C
non-condensing
15,000ft (4.6 km)
50,000 ft (15 km)
0.01
O" (0.25 mm) peak-to-peak,
5 Hzto 55 Hz, 75 minutes
20 g's (1/2 sine)
11 ms duration, 3 shocks in each
direction along 3 major axes,
18total shocks
12drops from 45°
4" or equilibrium, whichever
occurs first.
Meets MIL-T-28800D,class 5.
Exceeds MIL-T-28800D,class 5.
Exceeds MIL-T-28800D,class 5.
Meets MIL-T-28800D,class 5 with-
out plug-ins (0.015"
displacement, 30 g's shock).
Meets MIL-T-28800D,class 5 with-
out plug-ins (0.015"
displacement, 30 g's shock)
Meets MIL-T-28800D,class 5.
Qualified under National Safe Transit Association Preshipment Test
Procedures 1A-B-1 and 1A-B-2
Electro-mechanical compatibility within limits of F.C.C.Regulations,
Part 15, Subpart J, Class A.
20 kV maximum charge applied to instrument case.
Specification
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Table 1-3: Physical Characteristics
Characteristics Description
Nominal weight (without plug-ins) 8.75 lbs (4.0 kg)
Overall dimensions
Height
Width
Length
TM 502A Instruction Manual
5.5 inches (14.0 cm)
5.7 inches (14.5 cm)
16.6 inches (40.7 cm)
1-5

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1-6 Specification •

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Power Source
Power Usage/
Loading
Considerations
Line Voltage
Selection/Fuse
Replacement
TM 502A Instruction Manual
Operating Instructions
This section of the manual tells how to prepare the power module for use,
and install plug-in modules .
The TM 502A Power Module is calibrated and ready for use when received.
A list of standard accessories (and part numbers) is located in the back of
this manual.
The TM 502A Power Module is designed to operate from a power source
with its neutral at or near earth (ground) potential with a separate safety-
earth conductor. It is not intended to operate from two phases of a multi-
phase system.
With two plug-in modules installed, the TM 502A Power Module can require
up to 120 W of power at the upper limits of the high-line voltage ranges .
Actual power consumption depends on the particular module combination
and operating mode selected at any one time.
The power capability of the TM 502A Power Module can best be used by
carefully planning the plug-in configuration, the external loads, and the
resulting power distributions. The power module will work best ifyou do the
following:
1. Use equal loads in both compartments .
2. Dissipate as much power as possible in the external loads.
3. Operate the system in an ambient temperature near 25°C .
Each plug-in has access to a pair of heat-sinked, series-pass transistors-
one NPN and the other PNP. These transistors enable the plug-in to operate
in power ranges not possible ifthe power were to dissipate within the plug-
ins.
The line voltage selector is part of the line cord plug assembly, located in the
rear of the power module. Verifythat the voltage shown in the selector
window is correct for the line voltage available.
Ifthe displayed voltage selection is incorrect, or the fuse needs replace-
ment, perform the following procedure while referring to Figure 2-1.
1. Ensure that the power switch on the rear of the module is turned off and
that the line cord is not plugged into the line voltage connector .
REV DEC 1993 2-1

2-2
2. Removethe voltage selector/fuse holder by pushing the latch/release
bar toward the selection window. The selector/fuse holder should
release and move slightly out of the socket. Remove the voltage selec-
tor/fuse holder from the assembly.
3. Pull the fuse block and fuse from the voltage selector/fuse holder.
Remove the fuse from the fuse block. Make certain a replacement fuse
hasthe proper ratings for the selected line voltage (referto Specifica-
tions for the fuse rating). Insert the fuse into the fuse holder.
4. The line voltage selections are printed on the end of the fuse box.
Rotate the fuse box and reinstall it so that the proper line voltage selec-
tion is visible through the selection window.
5. Reinstallthe voltage selector/fuse holder.
6. Verify that the correct line voltage is visible through the line voltage
selector window.
Push and Hold
Latch/Release Bar
/
/
/
/
Voltage Selector/Fuse
Holder Assembly
(removed from
rear panel)
/
/
Fuse Box
Fuse
Figure 2-1: Line voltage selection/fuse replacement
Operating Instructions
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Handle/Tilt Stand
Installation
TM 502A Instruction Manual
Beforeyou install the handle, check the handle kit contents against the
following list:
2 Phillips screws
2 metal washers
2 lock washers
2 plastic locking buttons
1 metal handle
A Phillips screwdriver isthe only tool required.
Performthe following steps to install the handle/tilt stand .
1. Turnoff the power switch and disconnect the line cord .
/
Figure 2-2: Handle installation
2. Remove any plug-in modules .
3. On each side of the power module (approximately 2 inches (5 cm) from
the front edge) is a black plug. Remove each plug by pushing it out
from the inside of the power module.
4. From outside of the power module, place the plastic locking button in
the handle slot and into the square hole in the side panel, as shown in
Figure 2-2. Note that the rounded edges of the button must face the top
and bottom panels of the power module as shown in the illustration .
2-3

Operating
Temperature
Power Modules
Family Compatibility
Module Installation
2-4
5. Place the metal washer inside the side panel over the hole in the button.
6. Install and tighten the Phillips screw.
Repeat the procedure for the other end of the handle.
The TM 502A Power Module can operate in an ambient air temperature
range of o·c to +so·c (32°F to +122°F). Since the TM 502A Power
Module can be stored in temperatures between -ss·c and +75°C (-67°F
to +167°F), allow the instrument chassis to return to within the temperature
operating limits before applying power.
It is not necessary to use both plug-in compartments to operate the power
module.
Turnthe power module off before inserting or removing theplug-in;
otherwise, damage can occur to the plug-in circuitry.
Mechanically, the TM 500-series plug-in modules are very similar to other
Tektronix product families. However, they are not electrically compatible.
Therefore, the TM 502A interface has barriers on the mating connectors
between pins 6 and 7 to ensure that incompatible plug-ins cannot be in-
serted. (Pin 1 is on the connector end near the bottom side ofthe power
module.) A compatible module will have a matching slot between pins 6
and 7 of its main circuit board edge connector. This slot and barrier com-
bination is the primary keying assignment.
The modularity of this instrumentation system provides for a host of func-
tions to be performed by the plug-in modules. Specific functions are
grouped into families of classes, of which there may be several plug-in
module members. For example, some classes are power supplies, signal
sources, measurement, and so forth. Each modular member of a functional
family will have a second slot peculiar to its family assignment located in its
edge connector. The TM 502A can "program" one or both compartments to
accept only members of that family by installing a second barrier in the
interface connector to match the module's slot location. Contact the nearest
Tektronix field office to order additional barriers.
Operating Instructions
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