8
®
Automatic data logging
The Watt & Energy Meter 4075.50 can be connected
to a serial port on a computer. This can be used for
controlling and reading the instrument from the PC
and to read the built-in data logger.
If you want to communicate directly with the device
– e.g. via a terminal program like HyperTerminal - see
”Command Summary” later in the guide.
For interactive data acquisition on the PC, the pro-
gram Datalyse (download from datalyse.dk) is re-
commended.
The instrument can collect data without connection
to a computer, as it is equipped with a memory of
255 data record. Data is collected once every 10 se-
conds. When memory is full, data will automatically
be compressed to take up half the memory by storing
the mean of 2 consecutive records. For subsequent
measurements, the interval between measurements
is doubled, after which the process is repeated, etc.
From a computer, the data logging may instead be
set to stop after a certain time.
Read-back of the acquired data can only be done via
a computer with a terminal program.
Start and stop of data logging takes place with the
buttons on the front, while the rest of the communi-
cation always takes place through the serial inter-
face.
Managing the data logger starts with simultaneously
pressing the two buttons
Function
(3) and
Reset
(4).
The display shows
Log,
immediately followed by
one of three status messages:
Rdy
the instrument is ready for data logging
On
data logging started
Off
data logging stopped
You can switch between the above situations by
pressing (3) and (4), as outlined below:
Initial state Press
Function
(3)
Press
Reset
(4)
Rdy
➞
On
➞
Off
On
➞
Off
No change
Off
Free memory:
➞
On
➞
Rdy
memory full:
No change
Data logging starts as soon as status is
On
. To stop
data logging, switch status to
Off
(press
Reset
and
Function
simultaneously, and then
Function
). When
switching from
Rdy
to
On
, all memory is reset.
