JETI SCPI commands schematic and in examples

Transcription

1 Application Note 8 JETI Technische Instrumente GmbH Tatzendpromenade 2 D Jena Germany Tel. : Fax : sales@jeti.com Internet: JETI SCPI commands schematic and in examples JETI s instruments can be operated directly by the user via DLLs, VIs or with firmware commands. The following paragraphs show how to use the firmware commands. Scheme of possible command sequences In general there exist three methods to get measuring results, which are shown in the following chart. Method 1 distinguishes between the configuration of measuring parameters (CONFIGURE), the start of measurement (INIT) and the data output (FETCH). In method 2 the configuration is also necessary, but the measurement start is combined with the data output (READ). Method 3 combines all three steps (MEASURE, only selected parameters and measuring conditions have to be configured before). It is also possible to start with method 1, followed by method 3, using the already configured parameters. Afterwards it is possible to get (FETCH) other data already available, calculate new data (CALCULATE) or start a new measurement. The following chart shows these possibilities.

2 Application Note 8 JETI SCPI commands schematic and in examples 2 The following charts show the several commands more in detail. All specifications of the commands can be found in the command list (see operation manual). CONFIGURE

3 Application Note 8 JETI SCPI commands schematic and in examples 3 FETCH

4 Application Note 8 JETI SCPI commands schematic and in examples 4 MEASURE

5 Application Note 8 JETI SCPI commands schematic and in examples 5 CALCULATE

6 Application Note 8 JETI SCPI commands schematic and in examples 6 Examples of program flows Raw Data Measurement Measurement with a fixed integration time of 100 ms Execution of two measuring scans for averaging Dark measurement with internal shutter closed Light measurement with internal shutter opened Output of reference spectrum (difference between light and dark spectra) as data row with pixel wavelengths *CONF:TINT 100 <CR> *CONF:EXPO 2 <CR> *CONF:FORM 7 <CR> *CONF:AVER 2 <CR> *CONF:FUNC 2 <CR> *CONF:FUNC 3 <CR> *FETCH:REFER <CR> // Set the integration time to 100 ms // Set the exposure mode to use the configured integration time // Set the output format to raw data with wavelengths // Set the averaging to 2 scans dark measurement // Start the dark measurement reference measurement // Start the reference measurement // Output of reference spectrum Measurement with integration time adaption One measuring scan Included dark measurement with internal shutter closed Output of dark and light data in lines with space as separator *CONF:FORM 2 <CR> *CONF:FUNC 1 <CR> *READ <CR> *CONF:FUNC 2 <CR> *READ <CR> // Set the exposure mode to integration time adaption // Set the output format to space separated values light measurement // Start of light measurement and data output dark measurement // Start of dark measurement and data output Measurement with fixed integration time Dark measurement only before a light measurement sequence (dark compensation) Measurement of reference and transmission data Output of measured raw data in a selected wavelength range in steps of 10 nm *CONF:TINT 500 <CR> *CONF:EXPO 2 *CONF:DARKMODE 0 <CR> *CONF:FUNC 3 <CR> *MEAS:COMPDARK <CR> *CONF:FUNC 4 <CR> *CALC:LINT:TRANS // Set the integration time to 500 ms // Use the configured integration time // Use the dark compensation method reference // Run the dark measurement in advance (dark compensation method) // Start a reference measurement transmission // Start the transmission measurement // Output of linear interpolated data between 400 and 700 nm in steps of 10 nm

7 Application Note 8 JETI SCPI commands schematic and in examples 7 Radiometric Data Measurement Basic radiometric measurement Adaption of integration time to lightning conditions Output of basic values (radiometric, photometric and colorimetric values) Output of measured radiometric spectrum *MEAS:ALLVA <CR> *FETCH:SPRAD <CR> // Set the exposure mode to automatic adaption of integration time // Start a radiometric measurement and data output // Output of radiometric data Radiometric measurement Adaption of integration time Included dark measurement Wavelength range nm Wavelength step 5 nm Output of radiometric spectrum in wavelength/ value rows Output of radiance in W/ sr m 2 (if no measuring head is attached) Output of chromaticity u v *CONF:FUNC 6 <CR> *FETCH:SPRAD <CR> *FETCH:RADIO <CR> *FETCH:CHROMUV <CR> // Set the exposure mode to automatic adaption of integration time radiometric spectrum // Start a measurement // Output of radiometric spectrum in default wavelength range and step width // Output of calculated radiance // Output of u v Radiometric measurement Waiting time of 1 s after initination Adaption of integration time between 80 % and 90 % of full scale Output of spectral data in ASCII format (wavelength step 1 nm) Output of radiance of full wavelength range and of selected wavelength range nm Output of CRI with a fixed reference color temperature of 2856K *PARA:SDEL 1000 <CR> *PARA:BORD <CR> *PARA:SAVE <CR> *CONF:FUNC 6 <CR> *CONF:WSTP 1 <CR> *READ <CR> *FETCH:PHOTO <CR> *CALC:PHOTO <CR> *CALC:CRI 2856 <CR> // Set the delay time to 1 s // Set the borders for the integration time adaption // Save the new parameters // Set the exposure mode to adaption of integration time radiometric measurement // Set the wavelength step to 1 nm // Start a measurement and output of radiometric spectrum // Output of photometric value // Calculation of photometric value in selected wavelength range and data output // Calculation of CRI at specified CCT and data output