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Keithley 6514 Quick Manual Download Page 20

Model 6514 Quick Results Guide

11

Rate

The RATE key selects the integration time of the A/D converter. This is the period of time
the input signal is measured. The integration time affects the amount of reading noise, as
well as the ultimate reading rate of the instrument. The integration time is specified in
parameters based on a number of power line cycles (NPLC), where 1 PLC for 60Hz is
16.67msec (1/60) and 1 PLC for 50Hz (and 400Hz) is 20msec (1/50).

The rate setting is global for all measurement functions. Therefore, it does not matter what
function is presently selected when you set rate. There are two ways to set rate. You can
select slow, medium, or fast by using the RATE key, or you can set the number of power
cycles from the NPLC menu that is accessed by pressing SHIFT and then NPLC.

To change the rate setting, press (and release) the RATE key until the desired rate
annunciator (SLOW, MED, or FAST) is displayed:

•

SLOW — Selects the slowest front panel integration time (6 PLC for 60 Hz or
5 PLC for 50 Hz) and sets display resolution to 5

½

-digit resolution. The SLOW

rate provides better noise performance at the expense of speed.

•

MED — Selects the medium integration time (1 PLC) and sets display resolution
to 5

½

-digit resolution. Select the MED rate when a compromise between noise

performance and speed is acceptable.

•

FAST — Selects the fastest front panel integration time (0.1 PLC) and sets display
resolution to 4

½

-digit resolution. Select the FAST rate if speed is of primary

importance (at the expense of increased reading noise).

Digits

The DIGIT key sets display resolution for Model 6514. Display resolution can be set from
3

½

to 6

½

digits. This single global setting affects display resolution for all measurement

functions. To set display resolution, press (and release) the DIGIT key until the desired
number of digits is displayed.

Filter

Filtering stabilizes noisy measurements caused by noisy input signals. The Model 6514
uses two types of filters: median and digital. Note that both the median and digital filters
can be in effect at the same time.

NOTE

Changing the integration rate changes display resolution, but changing
display resolution does not change the rate setting (see RATE for
details).

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Summary of Contents for 6514

Page 1: ...Model 6514System Electrometer Quick Results Guide A G R E A T E R M E A S U R E O F C O N F I D E N C E ...

Page 2: ...T INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAM AGES SHALL INCLUDE BUT ARE NOT LIMITED TO COSTS OF REMOVAL AND INSTALLATION LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON OR DAMAGE TO PROPERTY Keithley Instruments In...

Page 3: ...Model 6514 System Electrometer Quick Results Guide 2003 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A First Printing May 2003 Document Number 6514 903 01 Rev A ...

Page 4: ...ld incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created allAddenda associated with the previous Revision of the manual are incorporated into the new Revision of the manual Each new Revision includes a revised copy of this print history page Revision A Document Number 6514 903 01 August 2003 All Keithley product names are trademarks or registered ...

Page 5: ...ected to mains voltage or to voltage sources with high transient over voltages Measurement Category II connections require protection for high transient over voltages often as sociated with local AC mains connections Assume all measurement control and data I O connections are for connection to Category I sources unless otherwise marked or described in the Manual Exercise extreme caution when a sho...

Page 6: ...tages The symbol indicates a connection terminal to the equipment frame The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading in a manual explains hazards that could damage the instrument Such damage may invalidate the war ranty Instrumentatio...

Page 7: ...eration 6 Selecting operating modes 6 Making volts and ohms measurements 6 Making amps measurements 7 Making charge measurements 7 Measurement considerations 8 Remote command programming 8 Settings to optimize performance 10 Range 10 Rate 11 Digits 11 Filter 11 REL key 12 Remote command programming 13 Features to enhance DUT testing 14 Buffer 14 Limit testing 16 Math operations 18 ...

Page 8: ...ions 1 Quick Results Guide Figure 1 1 Front panel 2 Figure 1 2 Rear panel 2 Figure 1 3 Input connector 4 Figure 1 4 Basic connections for unguarded measurements 4 Figure 1 5 Basic connections for guarded measurements 5 ...

Page 9: ...ement example 9 Table 1 6 Command sequence for amps measurement example 10 Table 1 7 SCPI commands rate digits filter and rel 13 Table 1 8 SCPI commands buffer 15 Table 1 9 Command sequence for buffer example 16 Table 1 10 Limit test display messages 16 Table 1 11 SCPI commands basic limit testing 17 Table 1 12 Command sequence for limit test example 18 Table 1 13 SCPI commands mX b and percent 19...

Page 10: ...basic simple operation to more complex procedures Remote command programming For the various Model 6514 operating modes covered in this guide the related SCPI commands for remote operation are summarized in tables Most commands have a query form For example FUNC VOLT selects the voltage measurement function while FUNC requests the present measurement function Note that the Model 6514 must be addre...

Page 11: ...MED SLOW AUTO ERR EXIT ENTER HALT TRIG RATE DIGIT MEDN AVG REL LIMIT STORE RCLL V V DROP I Ω XFBK ZCHK ZCOR GRD AUTO DIS GPIB RS 232 VAL CONF LIM MX B TEST CAL SAVE SETUP UNITS CONF TRIG CONF ARM NPLC DELAY DAMP Q Figure 1 Front panel RS232 DIGITAL I O PREAMP OUT 250V PK 2V ANALOG OUTPUT COMMON CHASSIS 120 FUSE LINE 630mA LINE RATING 50 60Hz 60 VA MAX T SB 100 VAC 120 VAC 315mAT SB 220 VAC 240 VAC...

Page 12: ...s used for guarded Volts and guarded Ohms measurements only The GRD key toggles guard on and off Low noise input cables When making precision measurements you should always use low noise cables The following low noise cables are recommended for use with the Model 6514 Model 237 ALG 2 This 2 meter low noise triax cable mates directly to the input connector of Model 6514 and is terminated with allig...

Page 13: ...volts and ohms measurements the driven guard GRD must be off Input High Input Low INPUT 250V PEAK Chassis Ground Volts Amps Ohms Coulombs A Unguarded GRD off Input High Guard INPUT 250V PEAK Chassis Ground Volts and Ohms only COMMON 0 1Ω Input Low B Guarded GRD on Fuse Figure 3 Input connector NOTE For Volts and Ohms GRD must be off HI LO DUT INPUT 250V PK Figure 4 Basic connections for unguarded ...

Page 14: ...n the guard plate To prevent electric shock always use a metal safety shield as shown in Figure 5 for guarded voltage measurements above 30Vrms 42V peak The metal safety shield must be connected to safety earth ground using 18 AWG or larger wire WARNING With an open input up to 250V peak may be present on the guard ter minals while in Volts or Ohms To prevent a safety hazard enable zero check when...

Page 15: ...vided in Table 1 Table 1 Volts and ohms measurement procedure Procedure Details 1 Enable zero check Press ZCHK to enable zero check before making connection changes or selecting function 2 Select function Press V to measure voltage Press Ω to measure ohms 3 Enable or disable guard Use the GRD key to select depending on guarded or unguarded connections 4 Perform zero correct volts only Press ZCOR t...

Page 16: ...5 Connect DUT to 6514 input See Figure 4 6 Disable zero check Press ZCHK to disable zero check in order to make measurements 7 Take readings from display Observe the amps reading on the front panel display Table 3 Charge measurement procedure Procedure Details 1 Enable zero check Press ZCHK to enable zero check before making connection changes or selecting function 2 Select coulombs function Press...

Page 17: ...The data string can be made of up to three elements separated by commas The first element is the voltage current resistance or charge reading the second is the timestamp and the third is status A three element data string is the default condition See Section 16 FORMat subsystem of the Model 6514 Instruction Manual for details on all aspects of the data format Command characters Commands characters...

Page 18: ...n range SENSe 1 XXX RANGe AUTO b Enable disable auto range ON or OFF SENSe 1 VOLTage GUARd b Enable ON or disable OFF guard for volts SENSe 1 RESistance GUARd b Enable ON or disable OFF guard for ohms SYSTem ZCHeck b Enable ON or disable OFF zero check READ Trigger and acquire one data string XXX VOLTage CURRent RESistance or CHARge depending on function Table 5 Command sequence for volts measurem...

Page 19: ...or each measurement function are listed in Table 7 The range setting fixed or AUTO is remembered by each function The full scale readings for every measurement range are 5 over range Table 6 Command sequence for amps measurement example Command Comments RST Restore GPIB defaults SENS FUNC CURR Select amps measurement function SENS CURR RANG AUTO ON Enable auto range SYST ZCH OFF Disable zero check...

Page 20: ...or 50 Hz and sets display resolution to 5 digit resolution The SLOW rate provides better noise performance at the expense of speed MED Selects the medium integration time 1 PLC and sets display resolution to 5 digit resolution Select the MED rate when a compromise between noise performance and speed is acceptable FAST Selects the fastest front panel integration time 0 1 PLC and sets display resolu...

Page 21: ...er moving or repeating With the moving filter each time a reading conversion occurs the readings in the stack are averaged to yield a single filtered reading The stack type is first in first out After the stack fills the newest reading conversion replaces the oldest Note that the instrument does not wait for the stack to fill before releasing readings With the repeating filter the unit takes a sel...

Page 22: ...e rate in PLCs 0 01 to 10 SENSe 1 CHARge NPLCycles n Set charge rate in PLCs 0 01 to 10 Digits command DISPlay DIGits n Set display resolution 4 to 7 Median filter commands SENSe 1 MEDian RANK n Set median filter rank 1 to 5 SENSe 1 MEDian STATe b Enable or disable median filter Digital filter commands SENSe 1 AVERage TCONtrol name Select filter control MOVing or REPeat SENSe 1 AVERage COUNt n Set...

Page 23: ...If in the external trigger mode each input trigger or press of TRIG key will store a reading The star indicator will go off when the buffer is full Recalling readings To recall readings press the RCLL key The message RDG NO 1 is displayed The arrow annunciator also turns on to indicate additional data is available for viewing Use the RANGE and cursor keys to navigate through the reading numbers re...

Page 24: ...ffer Command Description TRACe CLEar Clear readings from buffer TRACe FREE Query bytes available and bytes in use TRACe POINts n Specify number of readings to store 1 to 2500 TRACe FEED name Select source of readings SENSe 1 CALCu late 1 or CALCulate2 TRACe FEED CONTrol name Select buffer control mode NEVer or NEXT TRACe TSTamp FORMat name Select timestamp format ABSolute or DELta TRACe DATA Read ...

Page 25: ...s fail status Table 10 Command sequence for buffer example Command Comments TRAC POIN 20 Set buffer size to 20 TRAC FEED SENS Set to store raw readings TRAC FEED CONT NEXT Start storing readings TRAC DATA Request all stored readings CALC3 FORM MEAN Select mean calculation CALC3 DATA Perform calculation and request result Model 6514 must be addressed to talk after sending TRAC DATA and CALC3 DATA t...

Page 26: ...mit test commands Programming example The programming example in Table 12 tests limits on a voltage Limit 1 values are 1 and Limit 2 values are 0 1 Table 12 SCPI commands basic limit testing Command Description CALCulate2 LIMit STATe b Enable disable Limit 1 test b ON or OFF CALCulate2 LIMit LOWer n Set lower limit for Limit 1 n limit 9 99999e20 to 9 99999e20 CALCulate2 LIMit UPPer n Set upper lim...

Page 27: ...t This math function determines percent deviation from a specified reference value The percent calculation is performed as follows Input Reference Percent 100 Reference where Input is the normal display reading Reference is the user entered constant Percent is the displayed result Table 13 Command sequence for limit test example Command Comments RST Restore GPIB defaults CALC2 LIM LOW 1 Set Limit ...

Page 28: ...MATh MMFactor n Specify scale factor M for mX b 9 99999e20 to 9 99999e20 CALCulate KMATh MBFactor n Specify offset B for mX b 9 99999e20 to 9 99999e20 CALCulate KMATh MUNits name Specify units for mX b one or two characters enclosed in single or double quotes CALCulate KMATh PERcent n Specify reference value for Percent 9 99999e20 to 9 99999e20 CALCulate KMATh PERcent ACQuir Use input signal as re...

Page 29: ...Index B Buffer statistics 14 M mX b 18 P Percent 18 R Ratio programming example 19 REL Key 12 ...

Page 30: ...1 60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 75 00 Fax 0118 929 75 19 INDIA 1 5 Eagles Street Langford Town Bangalore 560 025 080 212 80 27 Fax 080 212 80 05 ITALY Viale San Gimignano 38 20146 Milano 02 48 39 16 01 Fax 02 48 30 22 74 JAPAN New Pier Takeshiba North To...

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