RCA
RCA
XLR
1/4”
XLR
1/4”
MIC
LINE
CABLE
POWER
OU
este
2
r
T
IN
OU
IN
OU
T
T
T
IN
OSCILLATOR
SHIELD
SHELL
SHIELD
SHELL
1 SHIELD
2 TIP
3 RING
2
3
1
1 SHIELD
2 TIP
3 RING
3 RING
1 SHIELD
2 TIP
SHIELD
RING
TIP
OUT
IN
TEST
1
1
este
2
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INTRODUCTION
The
whirlwind
Tester 2 represents the next
generation of cable testers using digital
circuitry to completely test any 2 or 3 conductor
cable regardless of its wiring configuration.
Simply plug the cable in and the Tester 2 will tell
you exactly how the cable is wired, immediately
ending guesswork with non-standard cables.
As with whirlwind's original Tester, hands are
free to move the cable at the connector ends to
check for intermittent connections. The Tester 2
also outputs test tones for active testing. The
versatile Tester 2 is a must for people working
with many types of gear with a variety of wiring
configurations.
DESCRIPTION
The Tester 2 will check the continuity from
every connector pin at one end to every
connector pin at the other end, including the
XLR barrel and display the results of each test
path. The Tester 2 checks XLR, 1/4" TRS, 1/4"
TS, and RCA cables with any combination of
these plugs. The Tester 2 can also be used to
check cables where simultaneous access to
both ends is impossible, an example being wall
mounted or other permanent installations. The
tone oscillator outputs a 500 Hz test tone at
either mic or line level. The tone is a filtered
square wave.
THEORY OF OPERATION
For each of the 3 conductors in a cable, the
Tester 2 has 3 LEDs for each conductor. The
digital circuitry in the Tester 2 sends a pulse
through each pin and monitors the 9 possible
connections that can exist on the other end of
the cable. The Tester 2 then sends the pulse
down the second pin followed by the third. The
9 LEDs display the results and are updated
continuously throughout the cycle. Intermittent
problems are displayed on the LED display by
flickering lights when shaking the cable,
indicating exactly where the problem is in the
cable. The Tester 2 outputs 62.5 test cycles per
second. The nine test LEDs are various colors.
Green LEDs are used to indicate a good mic
cable. A standard good mic cable (wired 1-1,2-
2,3-3), will light all 3 green LEDs. Red LEDs are
used to indicate a short or phase reverse in a
cable. Yellow lights caution that there are
problems with a balanced mic cable or that the
cable is unbalanced. For unbalanced mic
cables, the Tester 2 will display the hot pin
(connected to tip of 1/4"), and how the non-hot
pin is wired (grounded or floating). With
standard 2 conductor 1/4" instrument cables
the Tester 2 will display ring connected to sleeve
since the plug has a common ring and sleeve
connection. In this case the Tester 2 will not only
light the green LEDs for tip to tip and sleeve to
sleeve, but also 2 yellow LEDs for ring to shield
and shield to ring. The circuitry in the Tester 2
indicates if the shell of the XLR is connected to
it's corresponding pin 1. The test tone is on the
out XLR (male) and out 1/4" connector.
TESTING CABLES FROM ONE END
The Tester 2 can be used to test cables when
only one end is available by using a shorting
plug. This plug can be an XLR, either male or
female, with pins 1, 2 and 3 all connected
together or a 1/4" TS with the tip connected to
the sleeve. To test a cable, connect one end of
the cable to the Tester 2. The Tester 2 should
light no LEDs indicating that nothing is shorted.
TM
Next connect the shorting plug on the other
end of the cable. The Tester 2 should light all 9
LEDs indicating that there is continuity
throughout the cable and that the end is
shorted out. If both conditions are met the
cable is good.
HIGH CAPACITANCE LIMIT
The Tester 2 will not function correctly with a
cable which has over .22 uF of capacitance
conductor to conductor. For a typical MIC cable
(50 pF/ft.) the limit would be 4,400 feet.
BATTERY INSTALLATION
The Tester 2 uses one standard 9 volt battery
(alkaline type will provide longer operation). To
install the battery, remove the four screws on
the back and the cover. Attach the battery to the
clip and place it in the compartment with the
foam next to the PCB. Replace cover and
screws.
POWER SWITCH PROTECTOR
A small bumper is provided which can be
attached near the power switch to prevent
accidental turn on.
