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AM5(e) Classic Instruction Manual
2.16µf
T
TX/2W
Jack
or
Electronic
Terminals
Line-Hold
Circuit
OFF
HOOK
TX/2W
R
Circuit shown for LINE selection in 2W or
Figure 5–3 — 2–Wire Line Circuit Block Diagram
5.2.3 LINE 2W selection: When in the 2-Wire configuration (Figure 5–3), the
MEASURE and SEND functions are both connected to the TX/2W jacks.
However, the RX OFF HOOK, and TERMinating selections are inoperative for
the MEASURE functions. The impedance and loading coil selections are still
reflected at the RX jacks.
NOTE: dbm and dBrn calculation continue to be made based on the RX impedance
selection (see 5.2.7 and 5.2.10).
5.2.4
LINE 2W 2.16µf selection: This is the same as described above, except for the
insertion of a series capacitance of 2.16µf between the TX/2W jacks and the
terminating TX/2W impedances. This selection is typically used with SEND
QUIET mode for return loss measurements from the distant end of the circuit
5.2.5 DIAL terminal DIAL selection: completely
disconnects the TX/2W jack from the internal circuitry
of the unit, and routes the tip and ring leads directly to
the front-panel DIAL terminals. (If 4W REVerse is
selected, the RX jack is routed to the DIAL terminals).
A circuit connected to the jack is only terminated by an
instrument connected to the DIAL terminals.
Terminals are labelled "TIP" and "RING" for an AM5
Classic (shown at right) and "A" and "B" for an AM5e
Classic.
November 19, 1997
600
450
300
2W
(out)
2.16 µf
75
LINE
67.5
(in)
600
1200
450
900
300
600
(on hook)
75
150
67.5
135
Page 5-3
(18-0047)
LINE FUNCTIONS
200 K
200 K
QUIET
SEND
TX/2W
Impedance
Selections
3/1/93
2W
position.
2.16 µf
DIAL
MEAS
Frequency,
Level,
Noise
MEASURE
Selections
NTG
MEASURE
Signal
Generator
SEND
Selections
TIP
RING
DIAL
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