Tektronix TM 502A Instruction Manual
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Instruction Manual
Tektronix
/
TM502A
Power Module
070-6502-01
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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.
Please check for change information at the rear
of this manual .
First Printing: January I 993
Revised Printing: December 1993
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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
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, IL for Israel, etc.).
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
Printed in U.S.A.
Copyright
patents, issued and pending. The following are registered trademarks: TEKTRONIX, TEK, TEKPROBE, and
SCOPE-MOBILE.
© Tektronix, Inc., 1993. All rights reserved. Tektronix products are covered by U.S. and foreign
Tektronix, Inc., Beaverton, Oregon, USA
Tektronix United Kingdom, Ltd., London
Sony/Tektronix, Japan
Tektronix Holland, NV, Heerenveen, The Netherlands
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WARRANTY
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the
date of shipment. If any 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. Tektronix shall 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 BY TEKTRONIX 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
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 .................................. .
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
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Maintenance
TM 502A Instruction Manual
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 .................................. .
3-1
3-1
3-2
3-3
3-3
3-4
3-4
3-4
3-5
3-5
3-6
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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
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ii
Contents
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Symbols and Terms
Operators Safety Summary
Please take 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:
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damage to the equipment or other property .
• I wARNtNG I statements identify conditions or practices that could result in
personal injury or loss of life .
These two terms appear on equipment:
• CAUTION indicates a personal injury hazard not immediately accessible
as one reads the marking, or a hazard to property including the equipment itself .
statements identify conditions or practices that could result in
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• DANGER indicates 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
Refer to
manual
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TM 502A Instruction Manual
iii
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Specific Precautions
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
supply conductor and ground. A protective ground connection, through the
grounding conductor in the power cord, is essential for safe system operation.
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 making 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
Vrms between the supply conductors or between either
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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
To avoid 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
To avoid 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 connectors 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.
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iv
Safety
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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. To avoid
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
supply conductor and ground. A protective ground connection, through the
grounding conductor in the power cord, is essential for safe system operation .
Vrms between the supply conductors or between either
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TM 502A Instruction Manual
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vi
Safety
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Instrument
Description
Performance
Conditions
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°c and +so0c.
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TM 502A Instruction Manual
1-1
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Characteristics
+33.5 VDC
Tolerance
PARDb
Maximum load
Maximum load
-33.5 VDC
Tolerance
PARDb
Maximum load
Maximum load
+11.5 VDC
Tolerance
Maximum load
8
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Table 1-1 : Electrical Characteristics
Performance Requirements
Supplemental Information
+23.7 V to +40.0 V
::52.5 Vp-p
350mA
10 mA/µs
-23.7 V to -40.0 V
::52.5 Vp-p
350mA
10 mA/µs
+7.6 V to +16.0 V
::52.5 Vp-p
1 .3 A, shared with 17 .5 VAC
winding
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Maximum load
25 VAC (2 each compartment)
Range
Maximum load
Maximum floating voltage
17.5 V
Range
Maximum load
Maximum plug-in power
draw from mainframe
Combined power drawc
Sharing Limitation
~!
0
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 supply
35 watts DC or 75 VAAc
VAAc + 2.1 (wattsoc)
:s; 75
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1-2
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
Performance Requirements
Supplemental Information
VAAc + 2.1 (watts
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
50/60 Hz
Approximately 120 W
0
± 10%
c) :s; 75
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100 V, 120 V ranges
220 V, 240 V ranges
Miscellaneous
Maximum recommended plug-in
power dissipation
One-wide
Two-wide
Recommended adjustment interval
8
Worst case: Low line with full load and high line with no load. These limits Include PARO .
hPeriodic and Random Deviation. See National Electrical Manufacturers Association (NEMA) Standards Publication No. PY1-1972.
CAt nominal line voltage .
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
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TM 502A Instruction Manual
REV DEC 1993
1-3
Table 1-2: Environmental Characteristics
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Characteristics
Temperature
Operating
Non-operating
Humidityb
Altitude
Operating
Non-operating
Vibration
Shock
Bench Handling
Transportation
EMC
Description
Meets MIL-T-28800D, class 5.
0°c to +50°C
-55°C to + 75°C
95% RH, 0°C to 30°C
non-condensing
15,000 ft (4.6 km)
50,000 ft (15 km)
O" (0.25 mm) peak-to-peak,
0.01
5 Hz to 55 Hz, 75 minutes
20 g's (1/2 sine)
11 ms duration, 3 shocks in each
direction along 3 major axes,
18 total shocks
12 drops from 45°
4" or equilibrium, whichever
occurs first.
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.
Exceeds MIL-T-28800D, class 5.
Exceeds MIL-T-28800D, class 5.
Meets MIL-T-28800D, class 5 without 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.
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Electrical Discharge
awith plug-ins
1-4
20 kV maximum charge applied to instrument case.
Specification
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Characteristics
Nominal weight (without plug-ins)
Overall dimensions
Height
Width
Length
Table 1-3: Physical Characteristics
Description
8.75 lbs (4.0 kg)
5.5 inches (14.0 cm)
5.7 inches (14.5 cm)
16.6 inches (40.7 cm)
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TM 502A Instruction Manual
1-5
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1-6
Specification
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Power Source
Power Usage/
Loading
Considerations
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 safetyearth 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 if you 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 .
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Line Voltage
Selection/Fuse
Replacement
TM 502A Instruction Manual
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 if the power were to dissipate within the plugins .
The line voltage selector is part of the line cord plug assembly, located in the
rear of the power module. Verify that the voltage shown in the selector
window is correct for the line voltage available.
If the displayed voltage selection is incorrect, or the fuse needs replacement, 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
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2. Remove the 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
has the proper ratings for the selected line voltage (refer to 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. Reinstall the 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
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Fuse Box
Voltage Selector/Fuse
Holder Assembly
(removed from
rear panel)
Figure 2-1: Line voltage selection/fuse replacement
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Fuse
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2-2
Operating Instructions
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