TM 11-6625-2980-14
TM 503 OPERATING INSTRUCTIONS
Section II. INTRODUCTION
Description
The TEKTRONIX TM 503 Power Module is a three-
compartment-wide mainframe for the TM 500 Series of
Modular Instrumentation. It accepts up to three
independently functional plug-in modules to form a
compact, versatile and low cost instrumentation
system. The TM 503 is a basic power source and
provides an interconnecting scheme for the other
members of the TM 500 Series family. Factory options
allow customer modification using signal access at the
plug-in module/power module interface to provide rear
panel inputs and outputs, and interconnections between
compartments.
Power Source
This instrument 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
for operation from two phases of a multiphase system,
or across the legs of a single-phase, three-wire system.
Power Usage
With three plug-in modules installed, the TM 503
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.
Operating Temperatures
The TM 503 can be operated in an ambient air
temperature of 0°C to +500C. Thermal cutout devices
protect the system by disconnecting the power to the TM
503 Power Module when internal temperatures rise
above a safe operating level. These devices
automatically return power to the unit when the internal
temperatures return to a safe level.
Since the TM 503 can be stored in temperatures
between -400C and +750C, allow the instrument's
chassis to return to within the operating limits before
applying power.
POWERING UP
Plug-in Modules
It is not necessary that all the plug-in compartments
be utilized in order to operate the Power Module. The
only modules needed are those necessary to
accomplish the task.
Turn the Power Module off before inserting the plug-in;
otherwise, damage may occur to the plug-in circuitry.
Module Installation
1. Check the location of the white plastic barriers on
the interconnecting jack to insure that their locations
match the slots in the edge of the plug-in module's
circuit board.
2. Align the plug-in module chassis with the upper
and lower guides of the selected compartment. Push the
module in and press firmly to seat the circuit board in
the interconnecting jack. (Remove the plug-in module
by pulling on the white release latch located in the lower
left corner of each module.)
3. Pull the PWR button on the left side of the TM
503. Some plug-in modules have independent power
switches, usually labeled OUTPUT, controlling
application of mainframe power to the module itself.
Push this button to activate the plug-in module.
Loading Considerations
With three plug-in modules installed, the TM 503 can
require up to 120W of power from the line at high-line
A-3
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