Keithley 2016 - Configuration

Configuration
These configuration options are presented in the order commonly used to make a distortion
measurement. The SCPI commands are generic; actual syntax depends on the test programming
language used. Factory defaults are assumed.
Select the function
From the front panel, select the measurement function by pressing SHIFT then THD. For
remote operation, send the command:
:SENSe:FUNCtion 'DISTortion' ;select distortion measurement function
Set the distortion measurement type
1. Press THD-MEAS and the display shows “TYPE: THD”.
2. Use the right cursor to highlight the type selection, then use the ▲ and ▼ keys to select
THD, THD+N, or SINAD.
3. Press ENTER, then press EXIT.
For remote operation, send the command:
:SENSe:DISTortion:TYPE THD|THDN|SINAD ;select THD, THD+n, or SINAD
Set the distortion frequency acquisition
The Model 2016 must know the fundamental frequency of the input waveform. Even a
difference of a few hertz can cause large errors. The choices are AUTO, SET, and ACQUIRE.
AUTO acquires the frequency before each distortion reading. This slows down the reading rate,
but it is useful if the source frequency is unknown or unstable. ACQUIRE takes a frequency
measurement once and uses it for distortion measurements. SET allows you to select a frequency
between 20 and 20kHz (60Hz is default). AUTO or ACQUIRE are recommended instead of SET,
as the programmed frequency of the external source may not be accurate.
1. Press THD-MEAS.
2. Press ENTER once and the display shows “FREQ: AUTO”.
3. Use the cursor keys to select AUTO, SET, or ACQUIRE. (The source must be connected
and turned on for ACQUIRE.)
4. Press ENTER. If SET was selected, you are prompted for the frequency to be used. Use
the cursor keys and press ENTER to select it.
5. Press EXIT.
The following commands set the distortion frequency acquisition:
:SENSe:DISTortion:FREQuency:ACQuire ;acquire the frequency once
:SENSe:DISTortion:FREQuency:AUTO ON|OFF ;turn AUTO on or off
:SENSe:DISTortion:FREQuency xxxxx.xxx ;set frequency in hertz
Basic Measurements 2-35