Pathway LR Manual - Manual (Page 51)

DMXPathfinder LR DMXPathfinder Operations
50
Fluke 650 Cable Meter -- Please refer to the manufacturer's user's
manual for detailed instructions and theory before attempting to use this
instrument. It’s not obvious to the first time user! The Fluke 650 is provided with
a battery-powered remote plug-in unit, a set of 2 adapter cables (RJ45 to 5-pin
XLR) and an AC adapter. The unit may be powered by a 9-volt alkaline battery,
but battery life tends to be rather short with the 650 so use of the AC adapter is
recommended.
When the remote unit is connected to the other end of any DMX cable run,
the 650 will verify wiring continuity on all pins except ground (pin 1). Cable
length can also be measured with the instrument, and any anomalies, e.g.
changes in line impedance will be detected. The 650 measures performance of
the cable installation at up to 10 million bits per second.
The Fluke 650's signalling is not compatible with the DMXPathfinder LR
electronics or any other DMX generating or receiving equipment. Thus its
usage should be confined to the cable installation only.
Goddard Design Li'l DMX'ter -- This useful instrument can test most
aspects of the DMX Distribution System, from wiring continuity to signal
propagation through the Pathfinder electronics. Since the DMX'ter can both
generate and receive DMX512, it is 100% compatible with all aspects of the
distribution system, including any control system or receiving device. The
DMX'ter will directly control any receiving unit, and will verify the output of a
controller by displaying the data on an LCD readout. In addition, the instrument
will test cable continuity on all five XLR pins. Please refer to the Li'l DMX'ter
Operating Manual for more information.
Other Test Equipment -- The maintenance technician will find the
following additional test equipment useful:
.1 Oscilloscope -- for viewing data in conjunction with the
DMX'ter and its scope trigger module; for checking that both differential signals
are present on a given data line; for evaluating the performance of crosspoint
matrix and opto-repeater circuitry at higher operating speeds (greater than 250
Kbits per second).
.2 Frequency Generator -- for testing crosspoint matrix and
opto-repeater high-speed performance. Useful for evaluating whether other
systems with higher data rates can be used in the network.
.3 Digital Volt/Ohm Meter -- a general purpose tool for
checking continuity, termination resistor values and power supplies.