Lake Shore Model 218 Temperature Monitor User’s Manual
Special Features
5-11
5.3.2 Starting and Stopping Data Log
The
Log On/Off
key is used to start and stop data logging. The start and overwrite parameters set
with
Log Setup
determine the operation of
Log On/Off
key.
If start is set to clear, the
Log On/Off
key will first clear the data buffer of old records and then begin
the log sequence. Pressing
Log On/Off
again will stop the log sequence so data can be viewed or
printed. If overwrite is set to no, the log sequence will stop automatically at the end of the data buffer.
If overwrite is set to yes, new records will continue to overwrite old ones until the sequence is
stopped. Whichever method stops the log sequence, all logged data will be lost when the a new log
sequence is begun.
If start is set to continue, the
Log On/Off
key will begin the log sequence at the end of the old
records. Pressing
Log On/Off
again will stop the sequence. If overwrite is set to no, the log sequence
will stop automatically at the end of the data buffer. If overwrite is set to yes, new records will continue
to overwrite old ones until the sequence is stopped.
With logging active, the Data Log (
D
) annunciator displays. If overwrite is set to No, the (
D
)
annunciator will turn off when the end of the data buffer is reached.
5.3.3 Viewing Logged Data
To view logged records, first turn off logging with the
Log On/Off
key, then press
Log View
. If logging
is active when Log View is pressed, logging pauses while data is viewed and resumes after Log View
is exited.
When viewing logged records, the screen shown below displays.
The data log screen includes a record number, time, date, and the readings specified in the log setup.
The instrument tags any readings in which an alarm or error occurs with alarm/error designations
listed below.
L
Low
Alarm
H
High
Alarm
B
Both
Alarms
T
Temperature Over or Under Range
S
Sensor Over or Under Range
Use the Data Selection keys to scroll up and down. Scrolling up past the first record will show the last
record.
5.3.4 Line
Power
Loss
Data log memory is non-volatile and will not erase when line power is lost. The Model 218 cannot log
data while power is off, but it resumes the data log sequence when power is restored. Date and time
are also non-volatile and do not have to be entered after power loss.