Command line interface
6.9 Calibration
6.9.1 SINEWAVE
Syntax:
component
freq-or-period
unit
SINEWAVE
Instructs the DM24 to inject a sine-wave calibration signal, starting on the zero
crossing.
component
specifies which component is to be calibrated, expressed as one of
Z
,
N/S
,
E/W
, or
ALL
. Some sensors use only the Z calibration loop for all three
components.
freq-or-period
and
unit
together determine the frequency of the calibration
signal. If
unit
is
HZ
, then
freq-or-period
is taken as a frequency, in Hertz; if
SECOND
, then it is interpreted as a period, in seconds.
For example:
N/S 4 HZ SINEWAVE
freq-or-period
must be an integer; if you want to specify a period of, for example,
0.5 SECOND
, you must specify it as
2 HZ
instead.
The calibration signal will be automatically disconnected after 2 minutes (unless
you have altered the setting using the
MINUTE
command, described below).
Whilst calibration is in progress, the fourth (auxiliary, or
X
) data channel is switched
to monitor the returning calibration signal.
6.9.2 SQUAREWAVE
Syntax:
component
SQUAREWAVE
Instructs the DM24 to inject a square-wave (step function) calibration signal,
consisting of a positive step on the start of the next clock minute, followed by a
negative step some minutes later (by default, 2). The calibration is disconnected the
same number of minutes after the negative edge.
component
specifies which component is to be calibrated: one of
Z
,
N/S
,
E/W
, or
ALL
.
Some sensors use only the Z calibration loop for all three components.
You can alter the duration of each step using the
MINUTE
command, described below.
Whilst calibration is in progress, the fourth (auxiliary, or
X
) data channel is switched
to monitor the returning calibration signal.
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Issue U - December, 2021
