Dmm.rel.level - Keithley 3700A Series Reference Manual

Section 11: TSP command reference

dmm.rel.level

The offset value for relative measurements for the function selected by dmm.func.
Type TSP-Link accessible
Attribute (RW) Yes
Usage
value = dmm.rel.level
dmm.rel.level = value
value
Details
This attribute is not available if dmm.func is set to "continuity" or "nofunction". If you query
this attribute when either of these functions is selected, nil is returned.
When relative measurements are enabled (as set by dmm.rel.enable), all subsequent measured
readings are offset by the specified relative offset value. Specifically, each returned measured relative
reading is the result of the following calculation:
Relative reading = Actual measured reading – Relative offset value
Changing functions with dmm.func reflects the relative level offset setting for that function.
The relative offset level setting is saved with the dmm.func function setting, so if you use another
function, then return to the previous function, the relative offset level settings you set previously are
retained.
To set the relative offset level to include math, limits, and filter operations (if enabled) set
dmm.rel.level to dmm.measure(). However, these operations are not used if you use the
dmm.rel.acquire() function to set the relative offset level, even if the operations are enabled.
An error is generated:
•
If dmm.func is set to "continuity" or "nofunction".
•
If the value is out of range for the selected function.
Example
dmm.func = "accurrent"
dmm.rel.level = dmm.measure()
rel_value = dmm.measure()
dmm.rel.level = rel_value
dmm.func = "temperature"
rel_value = dmm.rel.acquire()
11-218
Affected by
Reset
DMM reset
Recall setup
The relative offset level setting
Perform an AC current measurement and use it as the relative
offset value.
Take a measurement and store it in the variable rel_value.
Use the rel_value to set the relative level attribute.
Acquire a relative offset level value for temperature.
Series 3700A System Switch/Multimeter Reference Manual
Where saved
Create configuration script
Save setup
3700AS-901-01 Rev. D/June 2018
Default value
0.000000E+000