Chapter 2 Features and Functions
Inputs
Getting Started Guide 2-7
POWER Input
58503B GPS Time and Frequency Reference Receiver
The Power input jack allows you to connect a 110/240 Vac, or +48 Vdc
or +24 Vdc power source (depending on which power option the
Receiver contains) to drive the 58503B.
Table 2-3 lists the XLR input jack pinouts. This jack is used for DC
power only.
Table 2-3. XLR Jack DC Power Connections
See Figure in Chapter 1 of this guide for illustration of the XLR jack.
59551A GPS Measurements Synchronization Module
The ac Power input jack allows you to connect 110/240 Vac power
source. The 59551A can also be operated from +129 Vdc using this
same ac input jack. You will need to assemble and connect a dc cable
using the supplied IEC 320 dc connector plug (part number 1252-
5672). See Chapter 1, “Getting Started,” for instructions.
Time Tagging Inputs (59551A Only)
The Time Tag 1, Time Tag 2, and Time Tag 3 BNC input connections
allow you to input time tagging data to the Receiver using one of the
following time tagging generators or equipment:
• Sequence of Events Recorders
• Fault Analyzers
• Phasor Measurement Units (PMUs)
The output of these devices are typically TTL pulses. The Receiver is
capable of time-tagging any similar TTL rising edge.
Time tagging an event is to record the UTC time at which the rising
edge reaches approximately 2.5V.
On each time-tag input, you are allowed to time tag up to 256 events
for efficient fault location, network disturbance analysis, and detailed
sequence-of-events analysis. The minimum time between events is
1 millisecond.
Pin Number Signal Name
1 dc supply (+)
2 dc return (−)
3 chassis ground
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