AMERITECH AM8a - E & M and SF - ANALOG MEASURE; TX1 VCM or TX2 VCM, DC or Ac; RX1 VCM or RX2 VCM, DC or Ac; TX1 Tone or TX2 Tone

AM8a Instruction Manual (18-0037) Meter Display
0037-S06.L_43 February 10, 2000
6-11
6.6 E & M and SF – ANALOG MEASURE
The measurements described in sub-sections 6.6.1 through 6.6.7 are made at the PCM1 jacks
labeled TX/2W and RX, and the PCM2 jacks labeled TX or RX on the front panel. Use as many
48-0047, or 48-0048 cables as are needed. The MEASURE selections described are listed in
the order presented (beginning at top of left column) as the MENU up key is pressed:
Description of Measurements
TX1 Vcm dc TX1 Vcm ac PCM1 Transmit tip & ring common mode
RX1 dBdsx PCM1 Received tip-ring bipolar amplitude
RX1 Vcm dc RX1 Vcm ac PCM1 Receive tip & ring common mode
TX2 Vcm dc TX2 Vcm ac PCM2 Transmit tip & ring common mode
RX2 dBdsx PCM2 Received tip-ring bipolar amplitude
RX2 Vcm dc RX2 Vcm ac PCM2 Receive tip & ring common mode
TX1 Tone PCM1 Transmit CHANnel tone (DBm and Hz)
RX1 Tone PCM1 Receive CHANnel tone (DBm and Hz)
TX2 Tone PCM2 Transmit CHANnel tone (DBm and Hz)
RX2 Tone PCM2 Receive CHANnel tone (DBm and Hz)
6.6.1 TX1 Vcm or TX2 Vcm, dc or ac: These selections measure the voltage difference or
delta between the Tip and Ring leads (∆V) of the PCM1 TX or PCM2 TX input jack. The
differential voltage measured is referenced to CO ground which can be connected to a
binding post on the rear of the unit.
6.6.2 RX1 Vcm or RX2 Vcm, dc or ac: These selections measure the voltage difference or
delta between the Tip and Ring leads (∆V) of the PCM1 RX or PCM2 RX input jack. The
differential voltage measured is referenced to earth ground rather than CO ground. The
differential voltage measured is referenced to CO ground which can be connected to a
binding post on the rear of the unit.
6.6.3 TX1 Tone or TX2 Tone: These selections are used to measure Level and Frequency of
Tones present on the selected channel of the PCM1 TX or PCM2 TX input jack. The
Level is displayed in dBm and the frequency is displayed in Hz. A measured value of
"UNDER" in the Level display indicates the measurement is lower than the acceptable
limit. (dBm < -40).