Arbiter Systems Portable Power Sentinel 933A Operation Manual page 46

Data Modes
There are five data modes for storing and handling data, including (1) Key
Logging logging one record to flash by pressing the LOG key, (2) Auto
Logging logging multiple records to flash using the Autolog feature, (3)
Trigger Log notification of triggered data being held in flash, (4) Review
Data notice that you are reviewing data stored in flash, and (5) Send
Data stored data being sent to one of the communication ports.
Timing Modes
There are three timing modes: (1) Unlocked the free-running internal
clock, (2) Locked to IRIG-B internal clock synchronized to an incoming
unmodulated IRIG-B signal, and (3) Locked to GPS internal clock
synchronized to an incoming GPS signal. When synchronized, we refer
to the internal clock as being "Locked."
Viewing Modes
There are two viewing modes: (1) Measurement Mode, and (2) Hold Mode.
Press the HOLD key to alternate between the Measurement Mode and
Hold Mode. The Hold Mode freezes the display and displays the current
data at the time that you press the HOLD key. During the Measurement
Mode, the indicator in the meter symbol is moving.
Date and Time
The 933A status indicators also provide you with the current Date, Day
of Week, and Time. In free running mode, you must manually set the
date and time for them to be correct. With a connected IRIG-B or GPS
synchronizing signal, the date and time are set automatically, and kept
accurate. Note: Use the correct IRIG-B type. Set the clock source to
unmodulated IRIG-B, with IEEE 1344 Mode ON. Status Indicators will
state NO DATE DATA and NO TIME DATA if set to any other type of
IRIG-B.
Internal Clock
The internal clock has three modes: (1) free running based on the
internal oscillator, (2) synchronized by an external IRIG-B signal, and (3)
synchronized by an external GPS signal. Timing Mode indicators show
the current mode as seen in the main figure on the previous page.
28