AALogic SR-101 User manual

SR-101 Signal Receiver
Fault Location Identification Receiver
Technician Manual
Version 2.0.0

Allied Analogic. Inc.
132 Redtail Ct.
Weatherford, TX 76088
[phone]
© 2017, AALogic Inc., All rights reserved

Version 2.0.0 i
Table of Contents
1 General Description ..............................................................................................................................1
1.1 Features ........................................................................................................................................ 1
1.2 Probe Compatibility ...................................................................................................................... 1
1.3 How Fault Locating Works ............................................................................................................1
1.4 Training .........................................................................................................................................1
2 What is included ...................................................................................................................................2
3 Main Display.......................................................................................................................................... 2
4 Modes ................................................................................................................................................... 2
4.1 CheckDSL....................................................................................................................................... 3
4.2 Buried............................................................................................................................................ 3
4.3 Aerial ............................................................................................................................................. 3
4.4 Configure....................................................................................................................................... 3
5 Before First Use..................................................................................................................................... 3
5.1 Battery Charging ........................................................................................................................... 3
5.2 Display Setup –Contrast and Backlite ..........................................................................................4
5.3 Timeout.........................................................................................................................................4
5.4 Carry case......................................................................................................................................5
5.5 Probe Selection ............................................................................................................................. 5
6 Aerial Mode...........................................................................................................................................6
6.1 Fault Location Concept ................................................................................................................. 6
6.2 Fault Type Identification ............................................................................................................... 6
6.2.1 Pair Split ................................................................................................................................7
6.3 DHC-124 Differential Hand-coil Sensor......................................................................................... 8
6.3.1 Other Probes and A-Frame ...................................................................................................8
6.4 Locating an Aerial Fault.................................................................................................................9
7 Detecting DSL......................................................................................................................................11
7.1 Frequency Scan ...........................................................................................................................11
7.2 Circuit ID......................................................................................................................................12
8 Specifications: .....................................................................................................................................13

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1GENERAL DESCRIPTION
The SR-101 Receiver is a multipurpose receiver used to monitor signals on cables. The SR-101 is compatible with
the DAP-125 differential amplified probe, DHC-124 differential hand-coil sensor, and other layup stick sensors
used for aerial fault locating.
This manual applies to firmware versions 3.16 and higher.
1.1 FEATURES
The features of the SR-101 Signal Receiver include:
•Locating resistive faults in cables for fault location.
•Monitoring for pair identification tone during cable transfers/restoration
•Identifying DSL presence on cable pairs
•Six standard frequencies: 145Hz, 335Hz, 577Hz, 987Hz, 2KHz, and 8KHz.
•Short, cross, and split fault location.
oLocating ground faults are more difficult due to multiple ground signal return paths. It
is recommended to locate shorts or crosses whenever possible. Otherwise it may be
helpful to remove shield ground at the transmitter location, then connect the
transmitter leads to the faulted wire and shield.
•Simple user interface and operation.
•Rechargeable internal battery
•Soft carry case with neck strap
1.2 PROBE COMPATIBILITY
The SR-101 along with the DHC-124 hand coil and DAP-125 probe are compatible with the ST-101 Cable
Fault Locator Transmitter for locating faults. The SR-101 is also compatible with some A-frames.
1.3 HOW FAULT LOCATING WORKS
The SR-101 helps locate faults by receiving a current signal on a resistive fault sent by a transmitter such
as the ST-101. The current flowing through the fault causes the signal to be radiated from the cable. The
highly sensitive SR-101 receiver, tuned to the signal frequency, allows the technician to locate the fault by
observing and listening to the changes in the signal strength. The signal significantly increases or
decreases as the technician moves past the fault, depending on the type of fault.
The ST-101 transmitter sends a high voltage, low current signal that is compatible with receivers capable
of monitoring one of the signal frequencies.
1.4 TRAINING
Check www.AALogic.com for videos or contact your local representative for additional information on the
SR-101 Receiver and other AALogic products.

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2WHAT IS INCLUDED
The SR-101 includes the following:
•SR-101 Signal Receiver
•DAP-125 Differential Amplifier Probe
•DHC-124 Differential Hand-coil Sensor
•Carrying case
•Charger
•USB Drive with manual
3MAIN DISPLAY
The SR-101 main display is shown in the following picture.
•The PWR/CLR on the lower left is used to exit any screen and to turn the unit on/off.
•A battery indicator is in the top left corner. Always check this before use. If only one segment is
indicated, charge the unit as soon as practical.
•The four modes are Check DSL, Buried, Aerial, and Config. Press the Function key below the label
to select a mode.
4MODES
This is a brief description of each of the four modes on the main display.

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4.1 CHECKDSL
CheckDSL mode allows the technician to identify or scan for DSL circuits. This can be beneficial when
special handling is required for cable pairs with these services.
4.2 BURIED
The Buried mode is used to locate buried cable faults when used with an A-frame probe.
This feature is described in an addendum to this manual.
4.3 AERIAL
The aerial mode allows the technician to locate resistive faults in aerial cables using the differential hand-
coil sensor, DHC-124, or another compatible probe. An appropriate transmitter, such as the AALogic ST-
101, must be used to send tone on the fault.
This mode can also be used to monitor 577Hz and 987Hz pair identification tone sent by AALogic or other
manufacturer test sets. The DAP-125 is connected to the SR-101 for pair identification.
4.4 CONFIGURE
The Configure mode allows the setting of the Display Contrast, Time-out, Display Backlight, and the Sound
mode.
5BEFORE FIRST USE
5.1 BATTERY CHARGING
The SR-101 should be charged before the first use.
Use only the supplied power supply. AALogic
recommends charging a minimum of four hours
before the first use. In normal operation, the SR-101
should be fully charged after two to three hours
depending on the level of discharge.
Plug the provided charger into an outlet and the
other end into the charger jack located on the right
side of the SR-101.
Two indicator LEDs are provided at the cord jack.
The green LED indicates the charger is connected
and has power. The red LED indicates the battery is
charging. The red LED is not on when the battery is
fully charged.
Charger jack
Indicator Leds

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5.2 DISPLAY SETUP –CONTRAST AND BACKLITE
Press the [F4] Config key from the main screen to
display the Config screen.
You can adjust the display for personal
preferences. The Contrast and Backlight levels are
both adjustable. It may be easier to increase the
backlight to a comfortable level first and then
adjust the contrast.
Press the [F2] ↓and [F3] ↑keys to decrease or
increase the values and press [F1] Select to save
them.
Pressing [F4] Exit returns to the main screen
without saving any changes.
5.3 TIMEOUT
The timeout option allows the SR-101 to shut down after a period of no key presses to conserve battery
power. The timeout can be disabled for continuous operation, as when the unit is operated with the
charger connected.
Press the [F4] Config key from the main screen to display the Config
screen.

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This timeout can be set in 15-minute increments from OFF to 45 minutes,
as shown, the SR-101 remains on until the user turns it off with the
[PWR/CLR] or the battery is exhausted.
Press the [F2] ↓and [F3] ↑keys to decrease or increase the value and
press [F1] Select to save the setting.
Pressing [F4] Exit returns to the main screen without saving any changes.
5.4 CARRY CASE
The included carry case may be adjusted for a comfortable carry height when worn around the neck. The
case is designed to hang in a face up position.
5.5 PROBE SELECTION
At least one probe is necessary when using the SR-101. Both the DAP-125 and DHC-124 are included. The
DHC-124 is preferred when using the Locate mode. An optional A-frame, no shown, is required for
locating buried faults.
DAP-125
DHC-124

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6AERIAL MODE
The Aerial mode uses a high-gain audio monitor to display signal levels. A time-based graph is displayed
providing a history of signal strength along with a matching audible tone. The graph is extremely useful when
analyzing signal level changes as the sensor is moved over the cable.
The graph records from left to right and takes approximately 20 seconds to complete the initial pass. The graph
then shifts left by one-half screen and continues recording signal levels.
6.1 FAULT LOCATION CONCEPT
Fault location is accomplished by measuring the signal received from the cable. Current flow through the
fault requires a source voltage and a complete path for the current. The ST-101, or other transmitter,
provides the source voltage and the resistive fault completes the path back to the source. This means
open faults, bridge tap, and other non-resistive faults are not located using the SR-101.
The technician monitors the cable at points along the cable to determine if the tone is present and
comparing the tone with the last position. Depending on the fault type, the tone will be significantly
lower, shorts and crosses, or higher, splits.
The location of the fault can be confirmed by moving back to a location between the fault and the
transmitter and comparing the signals.
6.2 FAULT TYPE IDENTIFICATION
Use a cable pair test set, such as the D-105, to identify the type fault to be located. Estimate the distance
to the fault from the test location.
The following aerial resistive faults may be located:
•Short
Tip connected to Ring
•Cross
Tip or Ring of one pair is connected to the Tip or Ring of another pair
Signal decreases when
passed a resistive fault
such as a Short, Cross.

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•Split
Tip or Ring of one pair is split with the Tip or Ring of another pair
✓Locating ground faults are more difficult due to multiple ground signal return paths. It is
recommended to locate shorts or crosses whenever possible. Otherwise it may be helpful to
remove shield ground at the transmitter location, then connect the transmitter leads to the
faulted wire and shield.
✓The cable length beyond the fault should be as short as possible.
Fault
Description
Connections
Short
Tip connected to Ring
Black to one wire and Red to other wire.
Ground
Tip or Ring connected shield
Black to sheath and Red to grounded wire.
Cross
Tip or Ring of one pair is connected to the Tip or
Ring of another pair
Black to one of the crossed wires and Red to the
other crossed wire.
Split
Tip or Ring of one pair is split with the Tip or Ring
of another pair
Black to one of the split wires and Red to the
other wire of the same pair. See Error!
Reference source not found..
6.2.1 Pair Split
During identification of the split, the technician must identify the two pairs involved in the split and if the
tips or rings are split. The diagram below shows a split and how to place temporary short at the end of the
section.
Locating a Split
TIP
RING
R
TTIP
RING
R
T
TIP
RING
R
TTIP
RING
R
T
Pair 1
Pair 2
TIP
RING
R
T
TIP
RING
R
T
Pair 1
Pair 2
Temporary
Short
Locating a Split
TIP
RING
R
T
TIP
RING
R
T
Pair 1
Pair 2
Temporary
Short
Locating a Split
TIP
RING
R
TTIP
RING
R
T
TIP
RING
R
TTIP
RING
R
T
Pair 1
Pair 2
TIP
RING
R
T
TIP
RING
R
T
Pair 1
Pair 2
Temporary
Short
Locating a Split
TIP
RING
R
T
TIP
RING
R
T
Pair 1
Pair 2
Temporary
Short

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A split location is identified by an increase in signal after the split.
6.3 DHC-124 DIFFERENTIAL HAND-COIL SENSOR
The SR-101 includes a DHC-124 Differential Hand-coil probe for fault location. This probe is designed to
reduce outside electrical interference, and optimized to virtually eliminate tone beyond the cable fault.
The DHC-124 is connected to the DAP connector on the right of the SR-101.
6.3.1 Other Probes and A-Frame
A phone plug connector on the right side of the SR-101 allows using other compatible probes with the SR-
101. Probes not manufactured by AALogic may not be compatible.
Coiling signal
level before the
fault.
Signal level increase
after the Split fault.
DAP-125 or DHC-124
connection jack.
A-Frame and other probes.

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6.4 LOCATING AN AERIAL FAULT
A signal transmitter, such as the ST-101, must be connected to the fault as discussed in 6.2 above. The frequency
and power settings for the transmitter should be selected and the transmitter set to send. Refer to the
transmitter documentation as needed.
1. Prepare the SR-101 by connecting the DHC-124 hand coil or another
appropriate sensor to the SR-101.
Connect a headset or earphone to the jack on the right side if desired.
2. Turn on the SR-101 and select [F3] Aerial using the keys from the main screen.
Earphone

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3. Select the frequency matching the transmitter frequency.
Use [F1] Select if needed to highlight Freq on the screen. Use [F2] ↓and [F3]
↑to highlight the desired frequency. The Frequency is immediately changed
each time [F2] or [F3] is pressed.
4. Place the probe near the cable and adjust the Gain and Volume for adequate
signal indications on the SR-101 and from the speaker/earphone. The graph
signal peaks should be between approximately 40% and 60%.
a. Adjust the gain by using [F1] Select, if needed, to highlight Gain on
the screen. Use [F2] ↓and [F3] ↑to decrease and increase the gain
values.
b. Adjust he volume by using [F1] Select, if needed, to highlight Volume
on the screen. Use [F2] ↓and [F3] ↑to decrease and increase the
volume to the desired level.
c. The sound from the speaker has Natural and Simulate options. Press
[F4] Sound to change the sound type. Either sound can be used and it
does not affect the location process.
Note: Simulate is the only option for 8KHz and 145Hz.
5. Move to points on the cable closer to the fault and move the probe along the
cable while monitoring the screen graph and/or audible tone for changes in
signal strength.
ALARGE CHANGE IN THE AVERAGE SIGNAL INDICATES THE FAULT IS BETWEEN THE PRESENT
LOCATION AND THE PREVIOUS LOCATION.
Short or
Cross
Located

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Note: The cable pair and group are twisted inside the cable. This means the pair may be on the top, bottom, or middle
as the probe is moved along the cable. It is normal for the signal indication to rise and fall wile monitoring the cable.
The fault location is determined by higher average signal peaks before the fault than after the fault for shorts and
crosses. The average peaks are higher after a split.
The average signal may also increase as a splice case is approached. This is due to the lack of sheath shielding at the
case and the separation of the pair groups during splicing.
The position of the pair in the inbound cable may be different than the outbound cable due to the change in position
of the pair in the two cables. Compare the average maximum signal before the splice and after the splice to confirm a
fault location.
6. To verify the location when the fault is indicated, compare the average signal
peaks before and after the identified location.
a. The signal should decrease significantly for shorts and crosses after the
fault.
b. The signal should increase after the point where a pair splits. If moving
from the spit section to the un-split section, the signal will decrease.
See the picture in 6.2.1 above.
7DETECTING DSL
The SR-101 monitors a frequency or group of frequencies to determine signal level, and produces an audio
sound in the speaker to indicate digital data transmission.
7.1 FREQUENCY SCAN
The DSL Frequency Mode scans the selected frequency range to indicate signal or noise level. The range is
selectable and displayed at the bottom of the graph. The graph vertical column on the left is the relative dB level
of the signal.
Cursor Mode can be selected and the scanning stops allowing the technician to select specific frequencies. The
frequency and dB level are shown at the top of the LCD graph. The received signal can be heard from the
speaker or a connected earphone.
Short or
Cross
Confirmed

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7.2 CIRCUIT ID
The Circuit ID function scans a number of frequencies to determine the type of DSL signal on the pair if one is
present. The types of DSL detected are HDSL, T1, ADSL, or VDSL. The indication xxDSL is displayed when an
unknown DSL type is detected.
Audible tones are heard when a circuit is detected. Each circuit type has a different tone and can aid the
technician to identify the circuit without referring to the SR-101 Display.

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8SPECIFICATIONS:
Receiver Gain ≥90dB
DAP-125 Gain 40dB
DHC-124 Gain 12dB
Display
Transflective Sunlight Readable
Backlight LED
Resolution 320x240
Power
Li-ion 2000mAH
Charger [email protected]
Operate Time 8 to 16 hours
Charge Time Approximately 2 Hours
Temperature
Charge 0 to 45c (32 to 113F)
Operate -20 to 60c (-4 to 158F)
Storage -20 to 60c (-4 to 158F)
Fault Limits
Resistive Fault Range (Ω) (approximate)
Fault Type
Cable Diameter
1”
2”
3”
Short
50K
30K
15K
Cross and T/R to Sheath
75K
50K
25K
Split
> 1600 ohms
Fault Limits are shown as a general guideline and may vary due to cable makeup or fault
position within the cable.

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