Section 4: Basic DMM operation
Series 3700A System Switch/Multimeter Reference Manual
4-52
3700AS-901-01 Rev. D/June 2018
Percent
The percent math function displays measurements as percent deviation from a specified reference
constant. The percent calculation is:
Where:
•
Percent
= The result
•
Input
= The measurement (if relative offset is being used, this is the relative offset value)
Reference
= The user-specified constant
The result of the percent calculation is positive when the input is more than the reference. The result
is negative when the input is less than the reference. The result of the percent calculation may be
displayed in exponential notation. For example, a displayed reading of +2.500E+03% is equivalent to
2500%.
Set percent from the front panel
To set a percent value on the front panel:
1. Open the function attribute menu:
▪
Press the
CONFIG
key.
▪
Press the
DMM
key.
2. Turn the navigation wheel to highlight the
MATH
menu item.
3. With
MATH
highlighted, press the
ENTER
key. The MATH MENU opens.
4. Select the
PERCENT
menu item.
5. Press the
ENTER
key to enter edit mode.
6. Turn the navigation wheel to edit the value.
7. Once the correct value is displayed, press the
ENTER
key. The MATH MENU opens.
8. From the MATH MENU, turn the navigation wheel to highlight and select the
ENABLE
menu
item.
9. Select
ON
and press the
ENTER
key.
10. Press the
EXIT
key twice to return to the main display.
Set percent through the remote interface
The
dmm.math.percent
(on page 11-203)) specifies the reference
value for the percent calculation, while the
dmm.rel.acquire
function (see
page 11-216)) uses the input signal as the reference value.
The acquire function triggers a single reading and uses the result as the new relative offset value.
When a value is set using
(on page 11-203), the
(on page 11-
203) query command returns the programmed value. When reference is set using
(on page 11-216), the
(on page 11-203) query command returns the acquired
reference value.
To set a percent value from a remote interface, send the following commands:
-- Set percent to 5
dmm.math.percent = 5
-- Sends 5 to the computer for display
print(dmm.math.percent)