Fluke 5700A User Manual
Contents
1. u Unsettled Lights when the output is changed and remains lit until the output settles to within specification Control Display Right Side Shows data entries UUT error adjustments softkey labels and other prompts and messages Each softkey label identifies the functions of the softkey that appears directly below it All of the softkey labels that appear on the display at once are referred to as a menu When you access the function provided through the softkeys you open up other menus containing new softkey labels 10 Display Screen Saver Both the Output and Control displays blank automatically after 30 minutes of inactivity unless the Calibrator is in one of the operating states that overrides the screen saver If the screen saver has activated you can restore the display by pressing ce Pressing another key or turning the knob restores the display and performs the command sent by the key or knob The screen saver does not operate e ifany part of the Setup menu is displayed during remote operation e during calibration or diagnostics e when an error message is displayed 11 Front Panel Keys OPR STBY Toggles the Calibrator between operate and standby modes In standby mode the OUTPUT binding posts are internally disconnected from the Calibrator The Calibrator powers up in standby mode The Calibrator automatically switches to standby mode when set I2. Front Panel Keys cont ENTER Loads a newly keyed in output value showing on the Control Display into the Calibrator If you press sem without identifying the units for the entry the Calibrator keeps the units except Hz that were last used This allows you to alter values for a function without keying in the units every time The multipliers are not retained for example you can enter 1 mV and then later simply enter 10 to obtain 10V In addition to these functions the key recalls the currently programmed reference value during error mode operation dm V A Q Hz Output Function Keys These keys select the output function as follows dBm Decibels relative to 1 mW V Voltage A Current QJ Resistance Hz Frequency When a value then are selected the Calibrator automatically switches to ac To change back to dc enter 0 or enter a signed or amplitude L m k M Multiplier Keys These keys select output value multipliers For example if you enter 33 then m then V then ENTER the Calibrator output value is 33 mV H micro 10 or 0 000001 m milli 10 or 0 001 k kilo 10 or 1000 M Mega 10 or 1 000 000 19 Front Panel Keys cont 0 9 Numeric Keypad Used to enter the digits of the output amplitude and freguency as well as o
3. To change the output back to dc press 0 Hz ENTER or ENTER A Short Calibration Exercise If you are not familiar with the Calibrator you will find that the following exercise quickly teaches you some important front panel operations Warming up the Calibrator When you first turn the Calibrator on you should let it warm up for 30 minutes This ensures that the Calibrator meets or exceeds its specifications Exercise Running dc Zero Calibration DC Zero is a brief internal process that removes offset errors The specifications reguire that you run dc Zero at least every 30 days To run dc Zero press the following seguence of softkeys Setup Menus Cal Zero Press any key then press i twice to return to normal operation Connecting a Meter Typical connections for handheld and benchtop meters are shown on the next page The diagrams show the use of Fluke Model 5440 7002 Low Thermal Cables Other types of cable may be used for this exercise To connect either type of meter proceed as follows 1 Verify that the Calibrator is on and is in standby mode STANDBY indicator lit If the Calibrator is not in standby press res 2 Set the meter to the lowest range that reads 10V dc 3 Connect the shield lead if your cables are shielded to V GUARD on the Calibrator 4 Verify that both As and a are off Press them if they are lit 5 Connect the meter
4. input LO to the Calibrator OUTPUT LO 6 Connect the meter input HI to the Calibrator OUTPUT HI Exercise Connecting a Meter cont OUTPUT SENSE VQA vo DMM orr orr Calibrator eter e OFF OFF EX SNS EX GRD Calibrator OUTPUT SENSE VOA vo WIDEBAND HI 2 HI INPUT N soo Hi oa aoo 4 AUX URRE O ARDA OUND DMM Nc O Applying a dc Voltage Apply 10V dc to the meter by pressing the following sequence of keys OPR 1 0 V ENTER S Checking the Calibrator Uncertainty Press sr The total uncertainty for the 10V you are applying to the meter is displayed on the Control Display the large dot matrix display on the right side of the front panel This number depends on the setting of the calibration cycle and specification confidence level in a setup menu Press 8 to clear the uncertainty display Exercise Activating Error Mode Chances are the meter reads something other than exactly 10V To quickly check the error of the meter turn the rotary knob to obtain a meter reading of exactly 10V and read the error off the Control Display Turning the knob is all it takes to activate error mode When you turn the knob the least significant digit is highlighted This digit changes
5. level selected in the setup menus OFFSET Identifies a UUT zero scale endpoint and does not change the output Subsequent keyed in output values have the offset value the Calibrator output value when was pressed added to them Offset mode is deactivated by pressing again or by selecting another function Offsets are available for dc outputs only 17 Front Panel Keys cont CE Clears a partially completed keypad entry from the Control Display or clears an error message that reguired acknowledgment If there is a partially completed entry when is pressed the output is unaffected REF This key is only active during error mode operation lt establishes the present output value as a new reference for meter error computation dBm When in the ac volts or wideband function and if no entry is in progress the key shows the equivalent dBm output on the Control Display For the ac voltage function dBm is calculated for a 6000 load For ac outputs less than 220 mV the Calibrator output impedance is always 50Q because the output is resistively divided For the wideband function dBm is calculated for a 500 resistive termination at the end of a three foot 50Q coaxial cable Note The formula to compute dBm is dBm 10 log power in mW Examples For 3 0V into a 600Q load dBm 10 log 15 000 11 7609 dBm for 3 0V into a 50Q load dBm 10 log 180 000 22 5527 dBm 18
6. 5700A 5720A Series II Multi Function Calibrator Operator Guide PN 601648 May 1996 Al ighis resened Prea nusa P ke KEE Contents What is in this Guide ssss Safety Summary sseeseeeeee A Fuse and Line Voltage Basic Operation kaka kaka A Short Calibration Exercise Warming up the Calibrator Exercise Running dc Zero Calibration Connecting a Meter Applying a dc Voltage Checking the Calibrator Uncertainty Exercise Activating Error Mode Checking the Meter s Higher and Lower Ranges eros reset Exercise Applying an ac Voltage Front Panel Features kaka Output Display Left Side Control Display Right Side Display Screen Saver Front Panel Keys Front Panel Connectors Rear Panel Features Rear Panel Connectors Switches and Fuse Holder Cable Recommendations Connecting to a UUT Unit Under Test Using Error Mode aaa Operating in Remote sssessssss RS 232 C Interface Parameters What is in this Guide The Operator Guide begins with safety information a short meter calibration exercise for new users then co
7. OUTPUT LO from the V GUARD The V GUARD binding post provides an external connection point for the voltage internal guard For a UUT with ungrounded inputs the V GUARD should be connected to LO internally The EX GRD key is toggled off For a UUT with a grounded input the GUARD may be externally connected to the grounded UUT input The EX GRD key is toggled on W BND Enables and disables the 03 Wideband AC option and sets the Calibrator to standby mode When enabled the ac voltage output over the range of 10 Hz to 30 MHz is available at the front panel WIDEBAND connector The wideband function is disabled whenever is toggled off or when another function such as current is selected 14 Front Panel Keys cont BOOST Enables or disables output from an amplifier when it would not otherwise be automatically selected Sets the Calibrator to standby if this selection moves the output location When available an amplifier is automatically selected for output settings that exceed Calibrator capabilities but fall within the limits of the selected amplifier The key is only needed to activate an amplifier for an output setting that is available from either the Calibrator or from the amplifier This allows you to take advantage of amplifier capabilities other than extended range i e higher compliance voltage For both voltage and current the amplifier is assumed to be a 5725A unless another model i
8. S pressed the Calibrator is sourcing an ac or dc voltage below 22V and a voltage greater than 22V is selected e the output function is changed e g from dc current to ac current the output location is changed The Calibrator does not switch to standby when the voltage is switched from any ac or dc voltage to an ac or dc voltage less than 22V 12 Front Panel Keys cont EX SNS Opens and closes an internal connection between the SENSE and OUTPUT binding posts The Calibrator powers up with these two binding posts connected internally the SENSE binding posts are open circuited and the indicator off Toggling on so it lights disconnects the sense lines from the OUTPUT binding posts External sensing should be used in the following function under the stated conditions e Inthe dc voltage function when the UUT draws enough current to produce a significant voltage drop in the cables e Inthe resistance function when the UUT has a four wire input and the Calibrator is set to 100 kQ or less e External sensing can also be used in the two wire ohms function to activate two wire compensation circuitry to the UUT terminals 13 Front Panel Keys cont EX GRD Opens and closes an internal connection between the V GUARD voltage guard and OUTPUT LO The Calibrator powers up with the V GUARD internally connected to OUTPUT LO and the indicator off Toggling on so it lights disconnects
9. amplifier output AUX An optional active binding post for CURRENT current This output is convenient for OUTPUT calibrating UUTs that have a Separate current input terminal 22 Rear Panel Features The following list provides descriptions of the connectors and switches on the Calibrator s rear panel Rear Panel Connectors 5725A AMPLIFIER Connector Provides the analog and digital interface for the Fluke 5725A Amplifier 5205A AMPLIFIER Connector Provides the analog and control interface for either the Fluke 5205A or 5215A Precision Power Amplifier 5220A AMPLIFIER Connector Provides the analog and control interface for the Fluke 5220A Transconductance Amplifier VARIABLE PHASE OUT BNC Connector Provides access to a variable phase nominal 2 5V rms sine wave signal The phase of this signal can be adjusted using the arrow keys and rotary knob or by remote commands to lead or lag the main Calibrator output signal by up to 180 The connector shell is not connected directly to chassis ground it is connected internally to the OUTPUT LO binding post The maximum allowable potential between the connector shell and chassis ground is 20V peak 23 Rear Panel Connectors cont PHASE LOCK IN BNC Connector Provides the input for an external signal onto which the Calibrator can be phase locked 1V to 10V rms 10 kQ input impedance The connector shell is not connected directly to chassis ground it is connected inter
10. and applications take care to achieve a good 500 impedance match use cable and connectors with a characteristic input impedance of 500 Wideband AC Voltage Output Option 03 33 Connecting to a UUT cont 5725A HI A Oc Lo CQ O 5725A Amplified Current Output 34 Using Error Mode Activate error mode by turning the rotary knob pressing an arrow key or pressing 55 When you enter error mode the starting value is the reference from which errors are computed A new reference is established when you exit and reenter error mode The following table lists the actions that cause the Calibrator to exit error mode 35 Using Error Mode cont Keys ENTER then ENTER Action Returns to the previous reference value Establishes a new reference ENTER A keypad entry then Establishes a new reference NEW REF Establishes the present output as a new reference x10 Sets the Calibrator to ten times the reference value and establishes a new reference Sets the Calibrator to one tenth the reference value and establishes a new reference OFFSET SCALE Identifies the present output as a zero scale endpoint for scaling and establishes 0 0 as the new reference Identifies the present output as a full scale endpoint for scaling a
11. as you turn the knob To change a higher order digit thereby speeding up the adjustment rate press lt The error on the Control Display is a combination of offset scale and linearity errors You can view component parts of the error by pressing rse and SCALE Checking the Meter s Higher and Lower Ranges To check the meter error at 100V dc first set the meter range if applicable to the lowest range that reads 100V Press x10 5 This sets a new reference equal to ten times the previous reference of 10V dc Pressing was necessary because the Calibrator goes into standby when it crosses the safety threshold from below 22V to over 22V Turn the rotary knob to re activate error mode and determine the meter error at 100V Now press 10 10 Set the meter range switch if applicable to the lowest range that reads 1V To end the error mode session press sre This recalls the reference value and exits error mode Press reset to set the output to 0 mV dc in standby Exercise Applying an ac Voltage There is no ac mode switch on the Calibrator You change a dc output to ac by entering a freguency through the keypad and pressing ENTER To test the meter at 10V at 1 kHz set the meter to read 10V ac press 1 0 v then 1 k Hz sm Adjust the rotary knob for a reading on t
12. ate of the Calibrator and returns the Calibrator to the power up default state This key is not effective during remote operation SCALE Identifies a UUT full scale endpoint for checking linearity and does not change the output If the output was adjusted with the rotary knob subsequent keyed in output values are multiplied by a scale factor Scaling is deactivated by pressing again or by selecting another function Scaling is not available for resistance outputs 16 Front Panel Keys cont LIMIT Calls up a menu that allows you to specify limits beyond which the Calibrator will not operate This can be used to set limits that protect both operators and eguipment 10 Changes the output to one tenth the reference value which is not necessarily the same as the present output value The value only changes if the new value is within performance limits x10 Changes the output to ten times the reference value which is not necessarily the same as the present output value The value only changes if the new value is within performance limits This key sets the Calibrator to standby if this change is made from a value less than 22V to one that is greater than or equal to 22V SPEC Causes the Calibrator to compute and display its uncertainty for the present output setting for the calibration interval and specification confidence
13. d to LO internally xs key toggled off For a UUT with a grounded input the V GUARD must be externally connected to the grounded UUT input Isa Key toggled on The maximum allowable potential between the V GUARD connector and chassis ground is 20V peak 21 Front Panel Connectors cont SENSE Binding Posts Used in the resistance and voltage functions for sensing at the UUT after you have selected external sense by toggling the x5s key on or by remote command External sensing should be used in the dc voltage function when the UUT draws enough current to produce a significant voltage drop in the cables and in the resistance function when the UUT has a four wire ohms input and the Calibrator is set to 100 kO or less External sensing can also be used in the two wire ohms function to allow the two wire compensation circuitry to the UUT terminals Refer to the connection diagrams for examples of usage OUTPUT Binding Posts Provide connection points for ac and dc current and voltage output as well as for resistance The function of each OUTPUT binding post is defined below LO The common binding post for all output functions including Calibrator amplified voltage output but not for Option 03 Wideband AC or auxiliary amplifier output HI The active binding post for all output functions including 5725A amplified voltage output does not include Option 03 Wideband AC or auxiliary
14. ding conductor in the power cord is essential for safe operation AN Do Not Remove the Cover To avoid personal injury do not remove the Calibrator cover Do not operate the Calibrator without the cover properly installed There are no user serviceable parts inside the Calibrator so there is no need to ever remove the cover N Fuse and Line Voltage The correct fuse type for each voltage selection is indicated on the rear panel as shown in the following figure J CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING VOLTAGE VOLTAGE sELEcTION USE F1 setection USE F1 S2 S3 S4 S2 S3 S4 100V MN NC ND 200V EO ECO NC T 125A 110V EN NC EN 250V 220V EO ND EN T 125A 250V 115VEH mu NC SB 230V NC ME O SB 120V MH NE EN 240V NE MN NN Line Power Label and Switch Locations Basic Operation To set the output simply press the following seguence of keys to select an output function and amplitude numeric keys multiplier function se SHY For example to set the output to 10 mV dc press OPR 1 0 m V ENTER SY To set an ac output press the following additional keys numeric keys multiplier Hz ENTER For example to change the present 10 mV dc to 10 mV ac 1 8 kHz press 1 8 k Hz ENTER
15. ds as short as possible Be careful not to exceed the capacitive load limit of 1000 pF up to 220V 600 pF 220 to 1100V 1000 pF with 5725A Amplifier AC Voltage gt 10 kHz 29 Connecting to a UUT cont A OFF ERR SNS EE GRD UUT Calibrator FRONT OUTPUT SENSE VQA va AN WIDEBAND E B OFF ecaro OFF UUT Calibrator REAR INPUT SENSE OUTPUT SENSE A WMV Q4 WIRE AC Current lt 2A 30 Connecting to a UUT cont Ed EJ Calibrator Calibrator 2 WIRE B ore E orr 2 Calibrator OUTPUTSENSE VOA VQ Calibrator Resistance 31 Connecting to a UUT cont 2 WIRE Calibrator OUTPUT SENSE vo Caution Use Connections With Exposed Plug Tips For The Ohms Function Only COMP t UUT A 8 i Calibrator i COMP 2 WIRE D OFF exaro OFF COMP Calibrator OUTPUT SENSE VOA vo IDEBAND Calibrator Resistance cont 32 Connecting to a UUT cont 50Q Feedthrough Terminator Supplied With Option 03 Calibrator OUTPUT SENSE VQA VQ A eee Cy AUX GUARD GROUND CURRENT Cable Supplied With Cable Supplied With Option 03 Option 03 NOTE For wideband meters with higher than 500 input impedance use the 500 feedthrough terminator at the meter connection end For all wideb
16. he meter of exactly 10V To test the meter s flatness press The 0 1 Hz digit is highlighted Press lt four times Turn the knob to change the 1 kHz digit until the Calibrator is set to 10 kHz Press 45 and turn the knob again to check the meter s accuracy at 10 kHz Each time you change the frequency you need to wait for the Calibrator output to settle the u annunciator will go out This ends the front panel exercise To zero the output and go to standby press reser Front Panel Features Following is a brief description of the Calibrator s front panel features Output Display Left Side Shows output amplitude and freguency The top line shows the active output value in up to eight digits plus a polarity sign The bottom line shows output freguency in five digits Annunciators below the amplitude line on the output display indicate the following active conditions OPERATE Lit when an output is active at the binding posts or auxiliary amplifier STANDBY Lit when the Calibrator is in standby ADDR Lit when the Calibrator is addressed over the IEEE 488 interface LCK Lit when the Calibrator output is phase locked to a signal at the rear panel PHASE LOCK connector SHF Lit when the Calibrator output has a programmed phase difference with a signal at the real panel VARIABLE PHASE OUT connector
17. nally to the OUTPUT LO binding post The maximum allowable potential between the connector shell and chassis ground is 20V peak IEEE 488 CONNECTOR This is a standard interface connector for operating the Calibrator in remote control as either a Talker or a Listener of the IEEE 488 Bus RS 232C Connector A male DTE serial port connector for transmitting internal calibration constant data to a printer monitor or host computer This connector is also used for remote control of the Calibrator 24 Rear Panel Connectors cont The OUTPUT SENSE and V GUARD binding posts on the rear panel are alternative connections to the UUT An internal cable enables either the front or rear binding posts The procedure to disable the front panel binding posts and enable the rear panel binding posts involves opening the cover of the Calibrator which should only be done by authorized service personnel The GUARD binding post provides an external connection point for the internal current guard The current guard is used when the Calibrator is supplying low level ac current through a long cable to remove errors introduced by leakage through the cable capacitance Refer to the connection diagrams for examples of usage AUX CURRENT OUTPUT This output is not available on the rear panel binding posts CHASSIS GROUND Binding Post A binding post that is internally grounded to the chassis If the Calibrator is the location of the grou
18. nd causes the display to show scale error RESET Softkey The Setup Menus Retums to the power up state Opens the setup menu 36 Operating in Remote To operate the Calibrator remotely proceed as follows 1 2 Turn off the Calibrator power Connect a remote interface to either the RS 232C or IEEE 488 connector on the Calibrator rear panel Turn on the Calibrator power Choose the correct remote parameters using the softkey menus a b Setup Menus Instmt Setup Remote Port Setup Select Remote Port type GPIB IEEE 488 Remote lang NORMAL or emulation mode Select either GPIB Port Setup or RS 232 Port Setup If GPIB select the address If RS 232 select the parameters in the next table 37 RS 232 C Interface Parameters Time out Period 2400 4800 9600 or 19200 0 to 30 seconds Parameter Choices Default Setting Data Bits 7 or8 8 Stop Bits lor2 1 Flow Control Ctrl S Ctrl Q Ctrl S Ctrl Q XON XOFF RTS or none Parity Checking Odd even ornone none Baud Rate 110 300 600 1200 9600 0 no time out EOL End of Line EOF End of File CR LF orCR LF Any two ASCII characters 38 CR LF no characters
19. nd reference point in a system this binding post can be used for connecting other instruments to earth ground The chassis is normally connected to earth ground through the three conductor line cord instead of through the earth ground binding post 25 Switches and Fuse Holder CALIBRATION SWITCH A slide switch that enables and disables the capability to write to nonvolatile memory This switch is used for recording and then storing calibration constants dates and parameter settings When this switch is in the ENABLE position you can write to memory when in the NORMAL position the data in the memory is protected from being overwritten The switch is recessed in order to allow the metrologist to cover it with a calibration sticker to guarantee calibrator integrity F1 Fuse Holder This holds the line power fuse See Fuse and Line Voltage at the beginning of this guide for the location of the correct ratings Line Voltage Selection Switches Select the operating line voltage See Fuse and Line Voltage at the beginning of this guide for the location of the label that shows the correct ratings 26 Cable Recommendations Output Function Cable Recommendations DC Voltage AC Voltage lt 10 kHz AC Current lt 2A lt 10 kHz DC Current lt 2A Resistance Low Thermal EMF Test Leads 5440A 7002 or twisted shielded pair AC Voltage gt 10 kHz AC Current with Guard SENSE GUARD T
20. ntinues with a condensation of information from the Operator Manual For complete information about the Calibrator s features functions and operating procedures refer to the Operator Manual Safety Summary Warning A Lethal voltage may be present on the terminals Observe all safety precautions in this guide To avoid electrical shock hazard the operator should not electrically contact the OUTPUT HI or SENSE HI binding posts During operation lethal voltages of up to 1100V ac or dc may be present on these terminals Whenever possible keep one hand away from the equipment to reduce the hazard of current flowing through vital organs of the body Symbols Marked on Equipment A Warning Risk of electric shock H Ground Protective ground earth terminal A Attention Refer to the manual for information about this feature This symbol appears on the rear panel ground terminal and by the fuse holder Use the Proper Fuse To avoid fire hazard use only the fuse specified on the line voltage selection switch label Safety Summary cont N Grounding the Calibrator The Calibrator is a Safety Class I grounded enclosure instrument The enclosure is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired earth grounded receptacle before making any connections to the Calibrator terminals A protective ground connection by way of the groun
21. riaxial cable or Twinax e g Alpha 2829 2 OUTPUT Coaxial Or SENSE Coaxial OUTPUT Coaxial GUARD Lead Separate wire Triaxial cable Wideband AC 3 feet 1m 500 coaxial cable with Type N male connector supplied with the option A 50Q feedthrough terminator is also supplied for connecting to meters with impedance higher than 50Q Voltage Boosted Output 5205A or 5215A Use the cable supplied with the amplifier Voltage Boosted Output 5725A Current Boosted Output 5725A 5220A Low Thermal EMF Test Leads 5440A 7002 Output is at the Calibrator front panel 16 gauge or heavier twisted pair insulated wire as short as possible to minimize resistance and inductance Output is at the amplifier terminals 27 Connecting to a UUT Unit Under Test UUT Calibrator SENSE OUTPUT SENSE INPUT GP WIRE vo vo JS 2 WIDEBAND gt era E B ess ON ers ON Calibrator SHIELDED TWISTED QUIPUT SENSE PAIR uM B SHIELDED TWISTED E PAIR c d OFF m ON Calibrator OUTPUT SENSE DC Voltage AC Voltage lt 10 kHz 28 Connecting to a UUT cont E C A era ON m OFF 2 Calibrator UU mN WIDEBAND 2 HI E E Bs lee BORE EA OFF UUT Calibrator INPUT SENSE OUTPUT SENSE DA Wine TRIAXIAL CABLE VOA Vo ZN gt WIDEBAND A 5 o NOTE Keep the SENSE lea
22. s designated in the Setup menus Aborts the current operation of the Calibrator and recalls the previous menu Some menus display a more specific label for this key such as DONE setting up Softkeys A The functions of the five unlabeled softkeys are provided through each menu in the Control Display with each function located directly above the softkey that activates that function Many of these functions access new menus that contain a new set of functions for the softkeys providing access to many capabilities and configuration options through the menu tree POWER switch Turns the power on and off 15 Front Panel Keys cont JL J 2 These keys are the output adjustment controls If any of these keys are pressed or if the knob is turned a digit on the Output Display becomes highlighted Turning the knob adjusts the output value An error display appears on the Control Display showing the difference between the original reference output and the new adjusted output The and keys move the highlight to the digit you wish to change In the ac functions the key allows you to move amongst voltage current and frequency In practice for voltage and current outputs the knob and arrow keys are used to adjust output until the UUT reads correctly The error display shows the UUT deviation from the reference RESET During local operation pressing aborts the current operating st
23. ther data such as the time and date The proper seguence for entering a value is to enter the digits then any necessary multipliers an output function key then me For example to obtain an output of 20 mV you would press the following seguence of keys 2 0 m V we The key is available for decimal places If the output function is dc voltage current ac voltage entered in dBm or a wideband output entered in dBm pressing toggles the polarity of the output If the output function is ac voltage or current pressing changes the output to dc 20 Front Panel Connectors WIDEBAND Connector A type N connector that provides a connection point for output from the 03 Wideband AC option Wideband output specifications are stated for output levels present at the end of its three foot 500 coaxial cable terminated into a 500 purely resistive load The connector shell is connected to chassis ground GND Binding Post If the Calibrator is the location of the ground reference point in a system the GND binding post can be used for connecting other instruments to earth ground The chassis is normally connected to earth ground through the three conductor line cord instead of through the earth ground binding post V GUARD Binding Post Provides an external connection point for the internal voltage guard For a UUT with floating ungrounded inputs the C GUARD should be connecte
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