S46L Microwave Switch System
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
1-888-KEITHLEY
(440) 248-0400
www.keithley.com
Relay Installation Guide
Introduction
This guide contains relay installation and system configuration information for the S46L Microwave Switch
System that is necessary after installing new relays. To install a relay , refer to Relay kits
the kits and then follow the applicable installation instructions.
WARNING The information in this section is only intended for qualified service
personnel. Do not attempt to replace p arts or otherwise service the
equipment unless you are qualified to do so.
for a description of
Relay kits
Table 1 summarizes available relay kits and part numbers.
WARNING Use only the part s specified in Table 1 when servicing the equipment.
Use of improper part s may expose the operator to hazardous volt ages
that could result in personal injury or death.
Table 1: S46L relay kits
Relay kit
model number
S46L-SPDT-KIT-L 20 GHz SPDT 1 to 4
S46L-SP6T-KIT-T 18 GHz SP6T A to D
Description
Relay
location
Kit parts summary
(quantity)
SPDT terminated relay
(1)
Connecting cable (1) S46-350
4-40 ×1/4 PPHSEM
screws (2)
4-40 ×3/8 PFH screws
(4)
SP6T terminated relay
(1)
Ribbon cable (1) CA-566B
Keithley
part number
RL-360
4-40X1/4PPHSEM
4-40x3/8PFH
RL-259
Installation
reference
SPDT relay 1
through 4
installation on
page 2
Relays A
through D
installation on
page 4
Installation
Before installing the relays, remove the screws that secure the S46L top cover, and then remove the cover.
PA-1031 Rev. A / March 2011 1
S46L Microwave Switch System Relay Installation Guide
Terminated
SPDT relay installation
Relay spacer screws
(2 per relay column)
Terminated
SPDT relay
1
2
3
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 “Inst allation refere nce” 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 (fro m the relay) thro ugh the PVC tubing ( PVC tubin g, 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 it s label facing up, and therefore, the pins shown in
the figure below are on the lower row.
• Solder the red wire to the pin marked +VCC.
• Solder the black wire to the pin marked E1.
• Solder the white wire to the pin marked E2.
2 PA-1031 Rev. A / March 2011
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