863/6487 User Manual - Electro Tech Systems
Contents
1. V SOURCE PROBE CONNECTIONS V SOURCE OUTPUT V SOURCE V SOURCE 863 6487 CONNECTIONS Figure 2 0 1 Cable Schematic 4 To external Ground connection Ground Plane is used when measuring insulative materials per ASTM D257 Insulating Plane is used when measuring static dissipative materials per ESD S11 11 Figure 2 0 2 Surface Resistance Resistivity Conductive Plane Insulated Plane Figure 2 0 3 Volume Resistance Resistivity Not connected Figure 2 0 4 Point to Point Resistance Figure 2 0 5 2 Point Resistance 3 0 OPERATION The Model 863 6487 is preprogrammed at ETS to measure resistance or resistivity with either a 10V 100V or 500V test voltage by selecting one of the three user configurations USRO USR1 or USR2 respectively USRO is programmed as the power up default setting Other voltages can be easily selected by the user at any time See SECTION 4 0 of this manual The following instructions should be followed to ensure consistent and accurate resistance measurements 1 Turn the instrument on by pressing the POWER switch The display will cycle through a self check program It is recommended that the instrument be allowed to warm up for one hour prior to use However the instrument be used immediately after turn on if necessary If the instrument is used on an ongoing basis the power should be left on in standby mode OPERATE switch off 2 Plac2. reduced so that the set maximum current is not exceeded When this level is exceeded the display will indicate OVRFLOW overflow or I LIMIT To determine the maximum voltage that can be used calculate IR 25 10 10V or less or 2 5x10 R gt 10 The lowest resistance that can be measured is 0 8 ohms TABLE 2 lists the suggested voltages for different minimum resistances Resistance Range Q Test Voltage Volts 0 5 0 01 25mA 5 0 10 50 1 00 500 10 00 5K 10 00 2 5mA 50K 100 00 250K 500 00 Table 2 Suggested Test Voltages 5 There is a delay while the instrument measures and calculates the next displayed value In addition there may be an additional delay due to electrification of the material This is a charging effect and will depend on the material being measured It is more noticeable at the higher resistance ranges Continue the test until the readings appear to stabilize At the conclusion of the test turn off the voltage source by pressing the OPER pushbutton blue warning indicator off This returns the instrument to the standby mode NOTE The Model 863 6487 reads only measured resistance Resistivity probes and test fixtures that have multiplication factors such as the ETS Model 803B x10 built in must have these multiplication factors applied to the displayed reading to convert resistance to resistivity 4 0 REPROGRAMMING The Model 863 487 is preprogrammed at the facto
3. RESISTANCE CURRENT METER Model 863 6487 BASIC OPERATING INSTRUCTIONS 6 08 electro tech systems INC www electrotechsystems com 3101 Mt Carmel Avenue Glenside PA 19038 Tel 215 887 2196 Fax 215 887 0131 TABLE OF CONTENTS VUGENERAE sz o ee ee eee 20 UONNECTIONS a o Oe Ka ao SDOPERATION O a o a rr a a san sa KA o e o 4 0 REPROGRAMMINOS KL 4 1 PES NONA 855 isisi soso nu esloos Emakso ku 4 2 Sampling Rate sse essa DLODI Yn kand san APPENDIX DEFAULT SETTINGS sl I SE NE oes LIST OF TABLES TABLE 1 Exponenilial EQUIVAaleN 5 ea KES EER CAE CYW TABLE 2 Suggested Test Voltages 2 EYN dynn LIST OF ILLUSTRATIONS FIGURE 2 0 1 Cable Schematic E o KR KJ FIGURE 2 0 2 Surface Resistance Resistivity FIGURE 2 0 3 Volume Resistance Resistivity FIGURE 2 0 4 Point to Point Resistance FIGURE 2 0 5 2 Point Resistance sssssssssssssssssssssssssssssssssascss FIGURE 4 1 1 Source Voltage Adjust 1 0 GENERAL The Model 863 6487 is a high resolution programmable picoammeter containing a 505V DC variable voltage source It provides an ohms function with direct readout for utilization a
4. TS to provide the most common measurement parameters required in current EOS ESD EIA ASTM and Military Standards and specifications f other test voltages or sampling intervals are desired the procedures for reprogramming these parameters are contained in SECTION 4 0 REPROGRAMMING 2 0 CONNECTIONS WARNING Hazardous voltages are present when the OPERate button is pressed The Keithley 6487 uses an interlock system that is designed to prevent inadvertent contact with hazardous voltages A safety cover or fixture is strongly recommended especially if the equipment is used in a Production environment ETS has jumpered pins 1 and 2 of the interlock plug to allow operation when the plug is inserted into the INTERLOCK connector on the rear panel As a result the operator must be sure to remain clear of the equipment probe contacts etc when voltage is present Blue warning light ON Connect the desired probe or test fixture to the Model 863 6487 using one of the setups shown in Figures 2 0 2 3 4 amp 5 The cable schematic is shown Figure 2 0 1 NOTE The Keithley 237 ALG 2 triaxial cable is not normally supplied with the 6487 and is purchased separately and modified by ETS for ease of use in making resistance measurements The red and black banana plugs on the triax connector end of the cable are to be plugged into the Voltage Source connectors red HI black LO on the rear panel of the 6487 TRIAXIAL INPUT CONNECTOR GROUND
5. e the appropriate test probe on the sample to be measured Ensure that good surface contact is made between the probe and the sample 3 Select a test voltage of either 10 100 or 500V by selecting USRO USR1 or USR2 respectively Press SETUP use RANGE up down arrows to select USR then press ENTER The instrument is defaulted at the factory for USRO 10V See Section 4 1 for selecting other test voltages To begin a test and take a reading press the OPER push button A blinking dot on the display will flash each time a sample is taken at an approximately six 6 second sampling rate that is preset by ETS If another sampling rate is desired refer to Section 4 2 for resetting the RATE value AUTORANGE is enabled as the default With AUTORANGE enabled AUTO indicator on the instrument will automatically adjust to the correct measuring range Occasionally it may be necessary or desirable to utilize manual ranging When using manual ranging choose an appropriate range value based on the voltage source setting and the expected measured resistance I V R Press either the Y or A range pushbuttons to select the desired range This will automatically disable the AUTORANGE mode Note The resistance range selected is not shown on the meter only the current range is displayed To reinstate AUTORANGE press the AUTO pushbutton The AUTO indicator will light on the display NOTE When measuring low resistances the test voltage must be
6. ry to enable the user to immediately place the instrument into service as a precision wide range resistance meter meeting most common resistance and resistivity test specifications This section covers reprogramming the instrument to default to other test voltages and sampling rates Refer to the Keithley manual for information on reprogramming other parameters 4 1 Test Voltages Open circuit test voltages from 0 to 505 Volts can be selected by the user The new values will remain in memory until they are either changed or the instrument is turned off Press either of the VSOURCE up down arrows to enter the voltage adjustment mode Then press either the lt or pushbuttons to move the cursor flashing digit Each digit may then be changed individually by pressing the A or Y pushbuttons under V SOURCE until the correct value is obtained Repeat this sequence until all of the digits are set to the desired level then press ENTER If the current limit prompt appears in most cases you may skip it by pressing EXIT after adjusting the voltage 6487 PICOAMMETER VOLTAGE SOURCI umr RATE ECALL azeno pame EXIT ENTER Figure 4 1 1 Source Voltage Adjust 4 2 Sampling Rate TRIGGER INTERVAL The sampling rate RATE is set by ETS for the maximum sampling rate NPLC 60 00 using the CONFIG RATE menu This presents a more stable display when making high resistance measurements The sampling rate is expressed in term
7. s a wide range resistance meter It provides a vacuum fluorescent display of the measured parameters along with analog and digital RS 232 and IEEE 488 outputs A complete set of detailed operating instructions is contained in the Keithley User s Manual supplied with each instrument The following instructions are limited to the set up and measurement of resistance or resistivity utilizing the ETS 800 series resistance resistivity probes or test fixtures or any other compatible probes or test fixtures The cable supplied has been specially adapted for direct interface with probes equipped with standard 162 banana jacks The Model 863 6487 when used as a resistance meter measures over the resistance range of 0 8 ohms to 5 x 10 ohms by V I calculation Test voltage is adjustable from 0 to 505 Volts Selectable current limits of 2 5mA 250UA and 25uA for the 50V and 500V ranges with a 25mA additional limit for the 10V range are provided Specified measurement accuracy is better than 0 6 between 1 x 10 to 1 x 1012 ohms after a one hour warm up period The instrument does not use exponents in the readout of resistance but rather the symbols of K for kilohms T for terohms etc TABLE 1 below lists the relationship between displayed symbols and the corresponding exponents Indicated Range Exponential Equivalent Q 10 KO 10 MQ 10 GQ 10 TO 1012 10 Table 1 Exponential Equivalents The instrument is preprogrammed at E
8. s of the Number of Power Line Cycles NPLCs See page 4 4 of the Keithley Manual for a detailed explanation There are two ways of changing the sampling rate Press the RATE key to select SLOW MED Medium or FAST or Press the CONFIG then RATE keys to enter the desired number of power line cycles NPLCs between samples To convert into time One power line cycle at 60Hz 16 66 ms 50Hz 20 ms This number can range from 0 01 to 60 for 60Hz or 0 01 to 50 for 50Hz power The arrow keys are used for entering the number in the same manner as described in section 4 1 for adjusting source voltage 10 APPENDIX DEFAULT SETTINGS ETS CONFIGURATION PARAMETERS The following lists the configuration parameters in the 6487 that are changed from the Keithley Factory defaults by ETS 1 Ohms mode selected 2 Sampling rate RATE set for a slow sampling rate NPLC 60 00 using the CONFIG RATE menu See section 4 2 3 Source Voltage settings USERO 10V USER1 100V USER2 500V 4 USERO is selected as the power on default using the CONFIG SETUP menu SAVING USER SETUPS To save a User Setup configure the Model 863 6487 for the desired measurement application then press SAVE and select the desired setup 0 USRO 1 USR1 2 USR2 and press ENTER to complete the process To save the power on setup press CONFIG and then SETUP and select FACT USRO USR1 USR2 or GPIB and press ENTER FACT is the Keithley factory default se
9. tting RESTORING SETUPS Press SETUP to display the restore menu then select the setup FACT USRO USR1 USR2 or GPIB and press ENTER FACT is the Keithley Factory default setting 11
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