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Series 3700 System Switch/Multimeter Reference Manual
Section 9
:
Instrument Control Library (ICL)
Document Number: 3700S-901-01 Rev. A / August 2007
9-73
dmm.autozero
Attribute
Indicates the auto zero setting for the DMM.
Usage
To read the auto zero status:
value = dmm.autozero
value: Represents the present auto zero setting (1 = ON, 0 = OFF)
To change the auto zero status:
dmm.autozero = value
value
: Represents the desired auto zero. Use one of the following:
dmm.ON or 1 to enable auto zero
dmm.OFF or 0 to disable auto zero
dmm.AUTOZERO_ONCE or 2 to refresh backgrounds once and go to auto zero off
setting (0 will be returned if auto zero status is read).
Remarks
This is the auto zero setting for the DMM. It applies to the selected function as indicated
by
dmm.func
(on page 9-91). Querying the auto zero when the selected function does
not have an auto zero setting associated with it will cause nil to be returned.
An error is generated if command is received when
dmm.func = “nofunction”
.
Also, an error will be generated if the value is invalid.
Changing functions with
dmm.func
(on page 9-91) will cause that function's auto zero
setting to take effect.
The auto zero once setting will force a refresh of the backgrounds. After doing this
once, the auto zero setting will automatically be set to "OFF". Therefore, querying the
dmm.autozero state after setting dmm.autozero to 2 generates a response of 0 and not
2.
Example
To enable auto zero for DC volts:
dmm.func = "dcvolts"
dmm.autozero = dmm.ON
To force backgrounds to cycle once and set auto zero to OFF:
dmm.autozero = dmm.AUTOZERO_ONCE
print(dmm.autozero)
0.000000
dmm.calibration.ac
Function
Signals the desired AC calibration step on the DMM.
Usage
dmm.calibration.ac(step, value)
step
: Represents the AC calibration step to perform
value
Represents the associated value for this functions step. This is an optional
parameter. Only use if calibration step has a value associated. If no value is needed,
use
dmm.calibration.ac(step)
.