Schweitzer Engineering Laboratories SEL-734 - Meter Configuration for High-Accuracy Timekeeping

7.2
SEL-734 Meter Instruction Manual Date Code 20090730
Time-Synchronized Measurements
Meter Configuration for High-Accuracy Timekeeping
Automatic
Time-Source
Selection
The SEL-734 automatically switches time-source inputs from internal to
IRIG-B if a valid IRIG signal is connected.
If the IRIG-B time source is unavailable or is unreliable, the meter switches to
the internal source. The meter automatically switches to a higher priority time
source (IRIG-B) when the meter measures an acceptable time source stability
and reliability. Time source selection can be determined by using the STATUS
command and observing the time source.
When an IRIG-B time source is present, the meter ignores the Daylight Saving
time settings.
Connecting
High-Accuracy
Time-Keeping
The procedure in the following steps assumes that you have a modern
high-accuracy GPS receiver with a demodulated IRIG-B signal. This example
assumes that you have successfully established communication with the
meter. In addition, you must be familiar with meter access levels and
passwords.
Step 1. Prepare to control the meter at Access Level 2.
a. Type ACC <Enter> at a communications terminal.
b. Type the Access Level 1 password and press <Enter>.
You will see the
=> prompt.
c. Type the 2AC <Enter> command, and then type the
correct password to go to Access Level 2. You will see
the
=>> prompt.
Step 2. Connect the cable.
Step 3. Attach the IRIG-B signal from the GPS receiver IRIG-B output
to the IRIG-B connector on the meter.
Step 4. Confirm automatic detection and changeover to timing mode
by issuing the STA command.
Step 5. Confirm that
Time Source: ext is the response you receive.
Figure 7.1 High-Accuracy Timekeeping Connections
GPS Receiver
IRIG-B
COMM
to Data Server
SEL-734
Courtesy of NationalSwitchgear.com