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AM8a Instruction Manual
6.4 LOOP START, GROUND START, DID – ANALOG MEASURE
The measurements described in sub-sections 6.4.1 through 6.4.6 are made at the LOOP jack on
the front panel using a 48-0062 cable. The DC and AC MEASURE selections described are
listed below in the order presented (beginning at top of left column) as the MENU up key is
pressed:
Vt-r
Vcm
Vt-g
Vr-g
It(ma) dc
6.4.1 V t-r dc or ac: These selections place the meter across the Tip and Ring leads of the
Loop input jack (the line). DC measurements result in the voltage displayed
numerically and on the bar graph. AC measurements display the voltage numerically
and graphically and give a frequency measurement.
6.4.2 V cm dc or ac: These selections measures the voltage difference or delta between the
Tip and Ring leads (∆V) of the LOOP input jack. The differential voltage measured is
referenced to CO ground which is connected to the sleeve lead, or can be connected to
a binding post on the rear of the unit.
6.4.3 V t-g dc or ac: These selections place the meter across the Tip lead with reference to
the Ground supplied on the sleeve of the LOOP input jack. The measurements are
displayed in the same manner as V t-r measurements.
6.4.4 V r-g dc or ac: These selections place the meter across the Ring lead with reference to
the Ground supplied on the sleeve of the LOOP input jack. The measurements are
displayed in the same manner as V t-r measurements.
6.4.5 It (mA) dc: This selection places the meter in series with the Tip lead of the LOOP input
jack. The measurement will be displayed numerically and graphically representing the
Loop current being drawn by the Terminal/Line equipment.
0037-S06.L_43
(18-0037)
Description of Measurements
Tone ac
tip-ring tone (dBm and Hz)
dc
Vt-r
ac
tip-ring voltage
dc
Vcm
ac
tip & ring common mode
dc
Vt-g
ac
tip-ground voltage
dc
Vr-g
ac
ring-ground voltage
tip (loop) current
6-7
Meter Display
February 10, 2000
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