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9 Sets the channel configuration mode to Auto. 12 to 19 Defines the comments for the internal memory 1 to 8. Agilent B2200 User’s Guide, Edition 2 Programming Capacitance Compensation Capacitance Compensation When the capacitance/conductance measurement is performed through the Agilent B2200, LCR meter measures the capacitance/conductance of the path including a device under test (DUT), matrix switches, extension cables and so on. So, the data measured by the LCR meter is far from the DUT’s capacitance/conductance. The Agilent B2200 VXIplug&play driver provides the functions used to compensate the capacitance/conductance measured by the Agilent 4284A LCR meter in the measurement environments described in “Required Conditions” on page 4-21. This section explains how to use the capacitance compensation function. • “Capacitance Compensation Function” • “Required Conditions” • “To Create Compensation Data File” • “To Perform Measurement and Compensation” Capacitance Compensation Function Driver functions used for the capacitance compensation are listed below. • agb220xa_selectCompenFile function • agb220xa_compenC function NOTE Corrected data by the function is not guaranteed. But typical data (supplemental data) is as follows. Capacitance measurement accuracy (typical): ±1 % ±0.5 pF This typical data is for the following measurement conditions: Measurement frequency: 1 kHz to 1 MHz Measurement range: Maximum 1000 pF Measurement terminal: At the end of the Agilent 16494A/B/C cable connected to the switch module output terminals. The typical data does not apply to anything extended from the 16494A/B/C cable. The conditions described in “Required Conditions” on page 4-21 must be satisfied. 4-20 Agilent B2200 User’s Guide, Edition 2 Programming Capacitance Compensation Required Conditions The following conditions must be satisfied to use the capacitance compensation function. For the instrument connections, see Figure 4-6. • Setting of the 4284A • Option required: 4284A-006 • Range of the measurement frequency: 1 kHz to 1 MHz • Measurement function: Cp-G • Connection to Agilent B2200 Use the Agilent 16494F CMU cable or the Agilent 16048D/E test leads to connect between the Agilent 4284A and the Agilent B2200 inputs. If the 16048D/E is used, the BNC-T adapters (2 ea., Agilent part number 1250-2405 for each) are required to connect between the Hc and Hp terminals and between the Lc and Lp terminals. • Calibration Perform the 4284A open calibration at the end of the measurement paths in front of the B2200 inputs. If you also perform the short calibration (optional), prepare the BNC thru adapter (Agilent part number 1250-0080, 1 ea.). • Total cable length of both Hc-Hp side and Lc-Lp side must be the same. • Agilent B2200 input ports AUX Input 13 (CMH, for 4284A Hc-Hp) and 14 (CML, for 4284A Lc-Lp) • Connection from the Agilent B2200 outputs to the connector plate or the Agilent B2220A probe card interface Use the Agilent 16494A triaxial cable or Agilent 16494B/C Kelvin triaxial cable. • Ahead of the connector plate Recommended cable: Agilent part number 8121-1191 Triaxial cable You can also use another type of triaxial cable, coaxial cable, or combination of these. To approximate the capacitance/conductance of the DUT, you need to obtain the appropriate compensation coefficients for your measurement environment, and create your compensation data file. See Figure 4-6. Agilent B2200 User’s Guide, Edition 2 Programming Capacitance Compensation In Figure 4-6, C2H, C2L, C3H, C3L are the compensation coefficients defined in the compensation data file. where, CxH is for the path connected to the Agilent 4284A Hc-Hp terminal, and CxL is for the path connected to the Agilent 4284A Lc-Lp terminal. When the Agilent B2220A probe card interface is used, obtain the coefficients for C3x, and create your compensation data file. In this case, probe card will be used for the C3x path. When the connector plate is used, obtain the coefficients for C2x and C3x, and create your compensation data file. In this case, triaxial cable with connector plate will be used for the C2x path. And coaxial cable with positioner will be used for the C3x path. For obtaining the compensation coefficients and creating the compensation data file, see “To Create Compensation Data File” on page 4-23. Figure 4-6 Extension Cables and Compensation Coefficients 4-22 Agilent B2200 User’s Guide, Edition 2 Programming Capacitance Compensation To Create Compensation Data File This section explains how to create the compensation data file. 1. Select one of the compensation data files (template, 20 files) installed when the Agilent B2200 VXIplug&play driver is installed. To select the most appropriate template for your measurement environment, see Table 4-9 that lists the file name and the measurement environment where the template targets. Each template is a text file that contains the information as shown below. # # Compensation data file for B2210A/Probecard I/F/3m ...
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