Keithley 3700 Series User Manual

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 attribute (see dmm.math.percent (on page 11-203)) specifies the reference
value for the percent calculation, while the dmm.rel.acquire function (see dmm.rel.acquire (on
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 dmm.math.percent (on page 11-203), the dmm.math.percent (on page 11-
203) query command returns the programmed value. When reference is set using dmm.rel.acquire()
(on page 11-216), the dmm.math.percent (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)

Keithley 3700 Series Specifications

General

Brand	Keithley
Model	3700 Series
Category	Multimeter
Language	English