SATEC EM720 Operation Manual - Manual (Page 17)

Chapter 2 Operating the EM720
Meter Clock and Time Synchronization
EM720 Power Quality and Revenue Meter 17
Password Security Level Access Rights
Password 2 Medium TEST mode.
Reset of meter and battery operation time
counters, failure counters and pulse counters.
Communications setup.
I/O operation setup and control.
Memory and recorders setup.
Billing/TOU system setup.
Password 3 High
(Administration
level)
Meter passwords setup.
Basic device setup.
Device energy and power options setup.
Reset of conventional log files.
The meter is primarily shipped with all passwords preset to 9
at the factory. It is highly recommended that you change the
factory set passwords as fast as possible. See
Configuring
Meter Passwords in Chapter 5 on how to change passwords in
your meter.
Password-tampering events are automatically recorded to the
Event log file after every three unsuccessful login attempts in
5 minutes.
Meter Clock and Time Synchronization
Time synchronization provides a common time basis for the
meter billing and tariff system, and for the power quality and
fault recorders so that events and disturbances can be
compared to one another.
The EM720 can receive time synchronization signal either
from a GPS satellite clock that has an IRIG-B time code
output, or from another device that can provide minute-
aligned time synchronization pulses through relay contacts.
The EM720 IRIG-B port uses unmodulated (pulse-width
coded) time code signal (unbalanced 5V level). The red
IRIGB LED is blinking when the IRIG-B port receives a GPS
clock signal.
The EM720 also provides an SNTP client that can receive
precise time from an available SNTP server via the Internet.
See Setting-Up SNTP Client in Chapter 5 on how to configure
the SNTP client.
See Time Synchronization Source in Local Settings setup for
more information on how to select an external time
synchronization source in your meter.
Monitoring Meter Batteries
The EM720 is provided with a rechargeable auxiliary battery
that can supply power in the event of long outages without
the need of an external power supply.
A second backup lithium battery keeps the meter clock
running when the meter goes to standby after the auxiliary
battery is discharged.