TM500 Series plug-in interface

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Tektronix TM500 mainframes provide power supplies and signal connections for TM500 plug-ins.

Mechanically, the interface is a direct card-edge connector with 28 contacts on either side (numbered from 1 at the bottom to 28 on the top) at 5/32" (~3.96 mm) spacing. The connector can be keyed in several places, the plug-in boards have matching cuts between contacts (see below).

There are two dedicated, floating 25 VAC transformer windings per slot, as well as several AC and DC buses shared by all slots.
For each slot, two uncommitted transistors (one NPN and one PNP) are mounted in the mainframe. These are available for the module's power regulation circuits.

The signal pin connections depend on the individual modules. For details, please see the TM 500 Rear Interface Data Book.

  B side A side
Pin Function Function
28..14 Signals Signals
13 25 VAC winding #1 25 VAC winding #1
12 +33.5 V filtered DC +33.5 V filtered DC
11 Collector lead of PNP series pass Base lead of PNP series pass
10 Transformer shield lead Emitter lead of PNP series pass
9 ±33.5 V common return ±33.5 V common return
8 −33.5 V filtered DC −33.5 V filtered DC
7 Collector lead of NPN series pass Emitter lead of NPN series pass
6 No connection Base lead of NPN series pass
5 17.5 VAC winding 17.5 VAC winding
4 +11.5 V common return +11.5 V common return
3 +11.5 V common return +11.5 V common return
2 +11.5 V filtered DC +11.5 V filtered DC
1 25 VAC winding #2 25 VAC winding #2

Interface connections viewed from rear of power module. Pins 14 through 28 are used for signal connections.

Pin group function legend

 DC power and ground
 AC power 
 Signals  
 Uncommitted transistors

Connector keys

  • between pins 6 and 7 - TM500 standard
  • between pins 19 and 20 - power supply family modules
  • between pins 21 and 22 - measurement family modules
  • between pins 23 and 24 - signal source family modules
  • between pins 25 and 26 - SC502 family
  • ...

See also