Tenma 72-6851, Instruction Manual

Page 1: ...PROGRAMMABLE HIGH CURRENT DC POWER SUPPLIES 72 6851 72 6853 INSTRUCTION MANUAL Downloaded from Elcodis com electronic components distributor ...

Page 2: ...l Table of Contents Specification 2 Safety 4 EMC 5 Installation 6 Connections 6 Manual Operation 7 Maintenance and Repair 10 Remote Operation 11 Remote Commands 20 www tenma com 1 Downloaded from Elcodis com electronic components distributor ...

Page 3: ...se currents up to 3A OVP Setting Direct keyboard entry OVP Range 1V to 40V 35V 10A 1V to 25V 18V 20A OVP Delay 200µs Load Line Regulation 0 01 of maximum output for 90 load change or 10 line change Ripple Noise 1mV rms typical in constant voltage 3mA rms typical in constant current HF Common Mode Noise Typically 3mV rms 10mV peak Transient Response 20µs to within 50mV of setting for 90 load change...

Page 4: ...tronic by interface command Readback Resolution Voltage 10mV over the entire range Current 10mA over the entire range Readback Accuracy Voltage 0 2 of reading 1 digit Current 0 5 of reading 1 digit RESPONSE TIME OVER RS232 GPIB Interface 15ms single command buffer empty Power Supply An internal time constant T typically 22ms governs the settling time of a step voltage increase Settling time to wit...

Page 5: ...arts except those to which access can be gained by hand is likely to expose live parts The apparatus shall be disconnected from all voltage sources before it is opened for any adjustment replacement maintenance or repair Capacitors inside the power supply may still be charged even if the power supply has been disconnected from all voltage sources but will be safely discharged about 10 minutes afte...

Page 6: ...thods and limits used were a EN60801 2 1993 Electrostatic Discharge 8kV air discharge b IEC801 3 1984 RF Field 3V m c IEC801 4 1988 Fast Transient 1kV peak AC line and 0 5kV peak DC output GPIB and RS232 interfaces Cautions To ensure continued compliance with the EMC directive the following precautions should be observed a after opening the case for any reason ensure that all signal and ground con...

Page 7: ... but nevertheless can generate significant heat at full power The supplies rely on convection cooling only and it is therefore important that ventilation is never restricted if performance and safety are to be maintained If the supplies are mounted in a restricted space e g a 19 inch rack then adequate ventilation must be ensured by using for example a fan tray Connections The load should be conne...

Page 8: ...D indicators is a continuously rotating control which may be used to make fine adjustments to voltage or current as described later General Principles of Manual Operation The following sections explain in detail the use of the keyboard to control all instrument functions If an error is encountered during keyboard operation the status display will show Ennn where nnn is a decimal number A full list...

Page 9: ...e V key The status display will show the set Delta Volts value and the V LED will light A new value may now be entered from the numeric keypad The value will be in Volts and the POINT key may be used to enter decimal digits Once the required value is entered press the CONFIRM key and the set Delta Volts value will be updated immediately To exit without making any changes press the ESCAPE key If a ...

Page 10: ...itched off This condition will persist until the instrument cools to below the trip temperature value when the output will be usable again Connection to the Load Output Terminals Connection to the front panel output terminals can be made with 4mm plugs spade terminals or wire ends To minimise voltage drop the connecting leads to the load should be of an adequate wire gauge and be kept short Load w...

Page 11: ...istributor or go to www tenma com Fuse The correct fuse type is 10 Amp 300V HBC time lag 5 x 20mm Make sure that only fuses with the required rated current and of the specified type are used for replacement The use of makeshift fuses and the short circuiting of fuse holders is prohibited To replace the fuse first disconnect the instrument from the AC supply Remove the 6 cover securing screws and l...

Page 12: ...te the and keys are used to cycle through all available values When the required value is displayed press the CONFIRM key to make it active Pressing the ESCAPE key will exit without making any changes Selectable baud rates are 300 600 1200 2400 4800 and 9600 To select address enter the required number from the numeric key pad When the required value is displayed press the CONFIRM key to make it ac...

Page 13: ...ks must be made in the connector at the PC end between pins 1 4 and 6 and between pins 7 and 8 see diagram Pins 7 and 8 of the instrument must not be connected to the PC i e do not use a fully wired 9 way cable Baud Rate is set as described above in Address and Baud Rate Selection the other parameters are fixed as follows Start Bits 1 Parity None Data Bits 8 Stop Bits 1 Addressable RS232 Connectio...

Page 14: ...e instrument commands is not allowed except as stated below for CR and LF codes and XON and XOFF codes When an instrument is first powered on it will automatically enter the Non Addressable mode In this mode the instrument is not addressable and will not respond to any address commands This allows the instrument to function as a normal RS232 controllable device This mode may be locked by sending t...

Page 15: ...ed to talk the instrument will send the response message it has available if any and then exit the talk addressed state Only one response message will be sent each time the instrument is addressed to talk Talk mode will be cancelled by any of the following interface control codes being received 12H Listen Address for any instrument 14H Talk Address followed by an address not belonging to this inst...

Page 16: ...onse formatter to be reset thus clearing the output queue The parser will then start parsing the next PROGRAM MESSAGE UNIT from the input queue See the Status Reporting section for further information The IEEE 488 2 DEADLOCK error is handled as follows If the response formatter is waiting to send a response message and the input queue becomes full then the instrument enters the DEADLOCK state and ...

Page 17: ... std 488 2 Any bits set in the Standard Event Status Register which correspond to bits set in the Standard Event Status Enable Register will cause the ESB bit to be set in the Status Byte Register The Standard Event Status Register is read and cleared by the ESR command The Standard Event Status Enable register is set by the ESE nrf command and read by the ESE command Bit 7 Power On Set when power...

Page 18: ...IEEE std 488 2 Their purpose is to allow the controller to be informed of entry to and or exist from current limit by any output Any bits set in the Limit Event Status Register which correspond to bits set in the Limit Event Status Enable Register will cause the LIM bit to be set in the Status Byte Register The Limit Event Status Register is read and cleared by the LSR command The Limit Event Stat...

Page 19: ...t if any bits set in the Standard Event Status Register correspond to bits set in the Standard Event Status Enable Register Bit 4 MAV The Message Available Bit This will be set when the instrument has a response message formatted and ready to send to the controller The bit will be cleared after the Response Message Terminator has been sent Bit 3 Not used Bit 2 Not used Bit 1 Not used Bit 0 LIM The...

Page 20: ...ironment The standby state will be set and the instrument will be in local with the keyboard active A complete self test will be performed just after power up and this will determine the values in the Failed Output Register and the state of the FLT bit in the Status Byte Register Due to the non volatile storage the power on settings are essentially modified by any command local or remote which cha...

Page 21: ...ified as Addressable RS232 ARC control codes WHITE SPACE is ignored except in command identifiers e g C LS is not equivalent to CLS The high bit of all characters is ignored The commands are case insensitive GPIB Remote Command Formats GPIB input to the instrument is buffered in a 256 byte input queue which is filled under interrupt in a manner transparent to all other instrument operations The qu...

Page 22: ...0 1 2 e1 and 120 e 1 are all accepted as the number 12 Any number when received is converted to the required precision consistent with the use then rounded up to obtain the value of the command nr1 A number with no fractional part i e an integer nr2 A number in fixed point format e g 11 52 0 78 etc Common Commands The commands in this section are those specified by IEEE Std 488 2 as Common command...

Page 23: ...ation and is of the form NAME model P 0 version rmt where NAME is the manufacturer s name MODEL defines the type of instrument and VERSION is the revision level of the software installed IST Sequential command Operation complete message generated immediately after rmt is sent Returns ist local message as defined by IEEE Std 488 2 The syntax of the response is 0 rmt if the local ist message is fals...

Page 24: ...arallel Poll Enable Register contains 01000001b the response to PRE will be 65 rmt RST Sequential command Operation complete message generated immediately after execution Resets the instrument as follows The output is set to minimum voltage minimum current maximum OVP meter damping off and output OFF No other action taken RCL nrf Sequential command Operation complete message generated immediately ...

Page 25: ... message generated immediately after execution Save settings to store number nrf The instrument settings are saved in the store pointed to by nrf If the value of nrf after rounding is less than 1 or greater than 25 an execution error is generated and error number 115 illegal store number is placed in the Execution Error Register The scope of the SAV command is as follows The output is set to store...

Page 26: ...nd is identical to VV nrf above except that no verification of the output voltage is performed thus saving the possible 500ms required to read back the output voltage This is useful when it is known that the slew time will be short or during constant current operation I nrf Sequential command Operation complete message generated immediately after execution Set current limit to nrf The value of nrf...

Page 27: ...ormat The syntax of the response is nr2 A rmt Example If the output current is 0 934 Amps the response to the command IO will be 0 934A rmt DELTAV nrf Sequential command Operation complete message generated immediately after execution Set delta voltage to nrf The value of nrf must be in Volts no multipliers are allowed If the value of nrf after rounding is outside the range of the specified output...

Page 28: ...ove except that no verification of the output voltage is performed thus saving the possible 500ms required to read back the output voltage This is useful when it is known that the slew time will be short or during constant current operation DECVV Sequential command Operation complete message generated immediately after execution Decrement the output voltage by the delta voltage value and verify th...

Page 29: ...mping to OFF or ON If the value of nrf after rounding is 0 the meter damping will be set to OFF if 1 the meter damping will be set to ON If the value of nrf is not 0 or 1 execution error 119 Value out of range will be generated LSR Sequential command Operation complete message generated immediately after rmt is sent Returns the value in the Limit Event Status Register in nr1 numeric format The reg...

Page 30: ... when the LRN command was issued The scope of the LRN command is as follows The output is set to the values of Volts current OVP delta V and delta A in the data block The output status is set to the value in the data block STO Sequential command Operation complete message generated immediately after rmt is sent Returns the contents of the stores in the instrument as an Indefinite Length Binary Blo...

Page 31: ...ndard Event Status Register OPC Returns the Operation Complete status PRE nrf Set the Parallel Poll Enable Register to the value nrf PRE Returns the value in the Parallel Poll Enable Register RCL nrf Recall Settings from store nrf RST Resets the instrument SRE nrf Set the Service Request Enable Register to nrf SRE Returns the value of the Service Request Enable Register STB Returns the value of th...

Page 32: ...ta current value INCV Increment the output voltage by the delta voltage value INCVV Increment the output voltage by the delta voltage value and verify POWER Returns the power being output from the instrument in Watts OP nrf Set the output status ON or OFF DAMPING nrf Sets the meter damping to OFF or ON LSR Returns the value in the Limit Event Status Register LSE nrf Set the Limit Event Status Enab...

Page 33: ...TEST EQUIPMENT 405 Pioneer Blvd Springboro Ohio 45066 Book Part No 48511 0450 Issue 2 Downloaded from Elcodis com electronic components distributor ...