Keithley 2016 User Manual page 67

11. When the display shows "IMPEDANCE: 50", select HIZ and press ENTER. (Setting is
ignored in this example.)
12. When the display shows "AMPL:" select 1.0000V and press ENTER.
13. When the display shows "CHAN2:" select ISINE and press ENTER.
The display should read approximately 0.2 %THD.
To illustrate why the 2016 needs to know the exact source frequency, perform the following:
1. Press THD-MEAS and press ENTER once.
2. When the display shows "FREQ:", select SET and press ENTER.
3. For the frequency, enter 01.0002kHz and press ENTER four times.
The display should read approximately 0.02 %THD and will be unstable. Note that the setting
for the function generator did not change.
Using the steps listed previously, return to the THD-MEAS menu and select ACQUIRE for
the frequency mode. The readings will return to approximately 0.02 %THD.
To perform this example remotely, send these commands:
*RST
:sens:func 'dist'
:sens:dist:type thd
:sens:dist:harm 2
:unit:dist:perc
:sens:dist:sfil none
:sens:dist:rang:auto on
:outp:freq 1000
:outp:imp HIZ
:outp:ampl 1
:outp:chan2 isine
:outp on
:read?
:sens:dist:rms?
;start from defaults
;select distortion function
;select THD type
;set highest harmonic to 2
;select percent distortion
;no shaping filter
;turn on autoranging
;set frequency to 1kHz
;set high impedance source
;set one volt
;select inverted sine
;turn on source
;trigger one reading, the distortion measurement can be read from
the bus
;return the RMS volts value corresponding to the above
measurement
Basic Measurements 2-43