Keithley S46L Series Installation Manual Download Page 2

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PA-1031 Rev. A / March 2011

S46L Microwave Switch System Relay Installation Guide

WARNING

Disconnect the power cord and all cables from the S46L before 
removing the top cover.

To find the applicable installation procedure for your specific kit, refer to the “Installation reference” column 
in 

Table 1

, and then perform the referenced installation.

SPDT relay 1 through 4 installation

1.

Remove the two (2) screws holding relay spacers in the relay column containing the desired relay 
installation location (see 

Figure 1

).

Figure 1: SPDT 1 through 4 relay installation

2.

Replace the spacer with the relay in the desired location (refer to the inset in 

Figure 1

 labeled 

“Terminated SPDT relay installation”).

3.

Install the two (2) screws removed in step 1 in the new relay column.

4.

Thread the red and black wires (from the relay) through the PVC tubing (PVC tubing, part number 
TX-52-7, is part of S46L-350) (not shown). The PVC tubing may be cut to a length that will allow 
the relay assembly to be removed without removing the top cover.

5.

Referring to 

Figure 2

, solder the three (3) control wires to the terminals of the relay:

NOTE

The relay is assembled with its label facing up, and therefore, the pins shown in 
the figure below are on the lower row.

Solder the red wire to the pin VCC.

Solder the black wire to the pin marked E1.

Solder the white wire to the pin marked E2.

Terminated

SPDT relay installation

Relay spacer screws 
(2 per relay column)

Terminated 
SPDT relay

1

2

3

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