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Operation
2.5.3 Triax banana plug adapter
For instruments that use banana jacks, you need a triax cable
terminated with a 3-slot male triax and a single banana plug.
Use the Model 237-BAN-3 or prepare a special cable as out-
lined below (Special triax to banana plug cable prepara-
tion) using the parts listed in Table 2-2.
Table 2-2
Parts for special triaxial cable
Keithley part or
model number
7078-TRX-3 triax cable*
BG-10-2
*One connector must be cut off
Figure 2-4 shows the conductors and insulation layers of a
triaxial cable. These layers must be carefully stripped back,
cleaned thoroughly and insulated with high insulation resis-
tance material such as Teflon to maintain the integrity of
the cable and measurement system. With the Model 237-
BAN-3, the center conductor of the triax is connected to the
banana plug. The inner and outer shields have no connection.
With the special cable shown in Figure 2-4, the inner shield
is shorted to the center conductor. Which cable to use
depends on your application. The length of unshielded con-
ductor that is connected to the banana plug should be mini-
mized to maintain signal integrity. The topic of signal
integrity is also discussed in paragraph 2.7 Measurement
considerations.
Note that you can use either an unterminated triax cable, or
cut a dual-connector cable (7078-TRX-10) in half to con-
struct two special cables.
Special triax to banana plug cable preparation
The following steps outline a procedure for installing a
banana plug on the end of a triaxial cable (with inner shield
shorted to center conductor).
1. Using a knife, cut and strip back the jacket about 1-1/2
inches.
2. Remove the outer insulation, then cut away the outer
shield as far as the insulation is stripped as shown in Fig-
ure 2-4(A).
3. Carefully strip away the insulation over the inner shield
one inch, then cut the inner shield and guard wire off
even with the stripped insulation as shown in Figure
2-4(B).
2-4
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Description
Triax cable terminated with
3-slot male triax connectors
Red banana plug
4. Strip the insulator back 1/2 inch, then twist the strands
of the conductor together as shown in Figure 2-4(C).
5. Unscrew the cover from a banana plug, then slide the
cover over the conductor.
6. Insert the stripped center conductor through the hole in
the body of the banana plug, then wrap the wire around
the plug body as shown in Figure 2-4(D).
7. Screw on the plastic cover as shown in Figure 2-4(E).
Make certain the wire is secure by gently pulling on the
plug.
(A) Cut off insulation with knife.
Cut off outer shield.
(B) Strip insulation off inner shield.
(C) Twist inner shield then strip inner conductor.
Twister inner shield and center conductor together,
slip on plastic cover.
(D) Insert wires into hole and wrap around body.
(E) Screw on plastic cover.
Figure 2-4
Triax cable preparation
Cut
Cut
1"
Insulation Over
Inner Shields
3/4"
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