DMM Command

Applies to: DMM mode. Can be set and read in any mode; takes effect only in DMM mode.

The DMM command sets the DMM submode (AC, DC and ACDC), DMM frequency (DMM:FREQ) and DMM number of periods (DMM:NOP). This command does not affect the behaviour of the DLOG and OSC modes.

Command Format:

R/W	Command	Response	Description
R	DMM:?	<dmm_submode>	Read the DMM submode
W	DMM:<dmm_submode>	ACK / NAK:x	Set the DMM submode
R	DMM:FREQ:?	<dmm_freq>	Read the DMM frequency
W	DMM:FREQ:<dmm_freq>	ACK / NAK:x	Set the DMM frequency
R	DMM:NOP:?	<dmm_nop>	Read the DMM number of periods
W	DMM:NOP:<dmm_nop>	ACK / NAK:x	Set the DMM number of periods

Parameter(s):

Name	Type	Allowed values	Default	Description
<dmm_submode>	string	DC	DC	DC is used to measure a Direct Current
<dmm_submode>	string	AC		AC is used to measure an Alternating Current removing its mean value
<dmm_submode>	string	ACDC		ACDC is used to measure an Alternating Current including its mean value
<dmm_freq>	float	47.00 – 63.00	50	Grid / signal frequency in Hz
<dmm_nop>	int	1; 10; 20; 100	1	Allowed DMM number of periods

The DMM:FREQ and DMM:NOP commands determine the output data frequency in DMM mode:

Output data frequency = DMM:FREQ / DMM:NOP

Example(s):

Set the DMM submode DC, set output data frequency to 5 Hz:

MODE:DMM
ACK

MODE:?
DMM

DMM:DC
ACK

DMM:?
DC

DMM:FREQ:50
ACK

DMM:FREQ:?
50

DMM:NOP:10
ACK

DMM:NOP:?
10