Measure Ntg Selection; Note; Monitor (Tx, Meas, Rx) Selections; Display (Send, Meas) Selections - AMERITECH AM5 Instruction Manual

AM5(e) Classic Instruction Manual
5.2.15 MEASURE NTG selection: When the NTG (Noise to
Ground) function has been selected by the MEASURE
switch, a balanced connection from both sides of the
RX line (or TX/2W line if in a 2-Wire configuration) is
made through 200 KΩ resistors to a high-gain amplifier
which then is connected to the level measurement
circuitry.
The frequency measurement circuitry is disconnected,
and only noise in dBrn (for AM5 Classic) or dBm (for
AM5e Classic) is displayed. (The right display reads
"NTG–"). The ground connection must be made to the
equipment ground for NTG measurements.
NOTE: The sleeve or the rear-panel ground terminal must be
connected to the ground of the equipment being measured.
There is no continuity between the AM5(e) Classic ground
and the chassis or the AC grounding lead.
5.2.16 MONITOR (TX, MEAS, RX) Selections: The monitor
switch (shown with its associated volume control) has
no effect on the line connections. It allows the user to
connect the built-in speaker to the TX/2W circuit, the
RX circuits, or the internal automatic-gain-control
amplifier which is used for RX measurements. The
MEAS selection permits the user to hear low-level
noise on the RX circuit which would be inaudible in the
RX position.
5.2.17 DISPLAY (SEND, MEAS) Selections: Like the
MONITOR switch, the DISPLAY selections have no
effect on line connections. The selections of the
DISPLAY key connect the internal level and frequency
measurement circuits to either the TX/2W circuits or
the RX circuits.
NOTE: The MEASURE parameters for IMPulse NOISE (with or without tone)
must be set in the MEAS position (Refer to sub-section 6.7.2). All other
parameters are set in the SEND position (Refer to Section 9).
November 19, 1997
(18-0047)
Page 5-6
LINE FUNCTIONS
NOISE IMP N
W/T W/T
NOISE IMP
NOISE
L/F S/N
15kHz RATIO
LEVEL
NTG
FREQ
MEA SUR E
(AM5 Classic)
NOISE IMP N
W/T W/T
IMP
NOISE
NOISE
S/N
L/F
RATIO
UNWTD
NTG
LEVEL
FREQ
MEA SUR E
(AM5e Classic)
MONITOR
TX RX
MEAS
SEND
MEAS
DISPLAY