5-53
© Sage Instruments 2000
9100-2930-02 01/31/00
Sage Instruments 930i Communications Test Set
5-18 OPTION MENU #:18 PEAK TO AVERAGE RATIO (P/AR)
OPTION MENU #:18, PEAK TO AVERAGE RATIO (P/AR), is available only when
Purchased Option
930i-100, Data Test Package, is installed. This feature allows you to measure P/AR values over a 0 to
200 P/AR unit range.
P/AR measurements are end-to-end measurements. On 2-wire circuits, one end transmits while the
other receives, then the sender and receiver switch places. One of the test sets must have its transmitter
turned off and act as a receiver only. To accomplish this you should press K3 under
MEASURE
immediately after entering OPTION MENU #:18. Pressing K2 under
SEND
like you do with a 4-wire
circuit would keep the P/AR transmitter turned on.
On 4-wire circuits, simultaneous transmitting and receiving is possible. When entering OPTION MENU
#:18, P/AR MEASUREMENT, you should press K2 under
SEND
first to check or adjust the transmit level
before measuring.
To measure P/AR values:
1. Connect the 930i to the circuit under test at the 2- or 4-wire analog trunk access point or at the
DEMARC. It can also be used on a E1 PCM trunk at the Jack Field. Before conducting a P/AR
test, set the 930i trunk type to the correct settings. (Refer to
Section 3, Front Panel Operation,
or
Section 4, PCM Operation,
for setup information.)
2. Press the Option Menu function key.
3. Use the Up/Down Arrow keys to scroll through the option menus, OR select 18 using the
numeric keypad and then press the Option Menu function key. The display reads:
OPTION MENU #: 18 P/AR MEASUREMENT
K1
K2
K3
K4
4. Press ENT or any soft key (K1-K4) to activate your selection. The display reads:
P/AR MEASUREMENT: SEND MEASURE EXIT
K1
K2
K3
K4
K2 under
SEND
controls the setup of the P/AR transmitter level and also sends the P/AR signal
on 2- and 4-wire circuits. The setups are retained in nonvolatile memory and need not be
accessed every time a measurement is made, unless the level is to be changed.
5. Press K2 under
SEND
to display the P/AR transmit level display if you are testing a 4-wire circuit.
(If you are testing a 2-wire circuit, skip to step #9.)
Option Menu #:
18
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