AM-48 Test Set (18-0015) Connection & Configuration
0015-S06
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6.5 Impedance Adapter
The Impedance Adapter (24-0005) is used:
1. To match the AM-48 to a user interface of
impedance other than
600Ω or 900Ω .
2. To match 4-wire split impedances .
See Figure 3-10 for an illustration of the Impedance Adapter; Figure
9-2 is the schematic diagram of the Impedance Adapter.
The Impedance Adapter is used to adapt the AM-48 to impedances of
75Ω, 135Ω, 150Ω, or 1200Ω. For example, high speed digital lines
typically have impedances of 75Ω, 135Ω, or 150Ω. A “THRU”
setting on the Impedance Adapter makes a straight through
connection resulting in a 600Ω or 900Ω termination inside the
AM-48.
To use the AM-48 with the Impedance Adapter:
1. Set AM-48 Switch 11 to <600Ω> and Switch 13 to <BRDG>.
2. Plug the Impedance Adapter into the AM-48 modular jack.
3. Plug a modular line cable into the jack on the Impedance
Adapter.
4. Connect the line cable to the 2-wire or 4-wire line per Figure 6-1
or 6-2.
5. Turn knob(s) on the Impedance Adapter to match the impedance
of the line:
a) For 2-wire, use only the upper knob.
b) For 4-wire, set the upper knob to match the Send pair
impedance and the lower knob to match the Receive
pair impedance.
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