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Stanford Research Systems DC205 Operation And Service Manual

Precision dc voltage source
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Operation and Service Manual
Precision DC Voltage Source
DC205
Stanford Research Systems
Revision 0.30 • February 22, 2019

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Summary of Contents for Stanford Research Systems DC205

  • Page 1 Operation and Service Manual Precision DC Voltage Source DC205 Stanford Research Systems Revision 0.30 • February 22, 2019...
  • Page 2 (1) year from the date of shipment. Service For warranty service or repair, this product must be returned to a Stanford Research Systems authorized service facility. Contact Stanford Research Systems or an authorized representative before returning this product for repair.

  • Page 3: Table Of Contents

    Contents General Information Safety and Preparation for Use ....Symbols ......Notation .
  • Page 4 A.2 ac voltage selector ..... A – 1 A.3 Fuse installation ..... . A – 3 DC205 Precision DC Voltage Source...

  • Page 5: General Information

    AC line voltage The DC205 Precision DC Voltage Source operates from a 100 V, 120 V, 220 V–230 V, or 240 V nominal ac power source having a line fre- quency of 50 Hz or 60 Hz. Before connecting the power cord to a...

  • Page 6: Symbols

    Symbols you may Find on SRS Products Symbol Description Alternating current Caution - risk of electric shock Frame or chassis terminal Caution - refer to accompanying documents Earth (ground) terminal Battery Fuse On (supply) Off (supply) DC205 Precision DC Voltage Source...

  • Page 7: Notation

    • Literal text other than command names is set as OFF Remote command examples will all be set in monospaced font. In these examples, data sent by the host computer to the DC205 are set as straight teletype font, while responses received by the host computer from the DC205 are set as slanted teletype font.

  • Page 8: Specifications

    (typical) ◦ ◦ C – 40 (0.1 – 10) Hz 10 Hz – 100 kHz ◦ ±( ppm setting + μV)/ μVrms 1 + 1 1 + 2 10 V 1 + 15 100 V DC205 Precision DC Voltage Source...
  • Page 9 Temperature C to 40 C, non-condensing < 20 W, 100/120/220/240 VAC, 50/60 Hz Power 8.3 W × 3.5 H × 13 D Dimensions Weight 10 lbs two (2) metric size 5 × 20 mm Fuse DC205 Precision DC Voltage Source...
  • Page 10 General Information DC205 Precision DC Voltage Source...

  • Page 11: Getting Started

    1 Getting Started This chapter provides step-by-step instruction to get started quickly with the DC205 Precision DC Voltage Source. Refer to chapter 2 for a more complete introduction to the DC205. In This Chapter 1.1 How to use this manual ....1 – 2 1.2 Preliminaries .

  • Page 12: How To Use This Manual

    Those who want to begin with an overview to the functional layout of the instrument should turn to Chapter 2. Users who prefer to jump in and begin using the DC205 first should continue with this Chapter, where a series of step-by-step procedures are given to verify the basic performance of the instrument.
  • Page 13 +1.00000 V. 10. Allow the unit to warm up for 2 hour for full specified perfor- mance. Warm up is not needed to test basic functionality. DC205 Precision DC Voltage Source...

  • Page 14: User Interface

    Now slowly turn the knob clockwise. The ¦ ¥ DC205 should click, and the least significant digit (tens of mi- crovolts) begin incrementing. Continue turning the knob until the display shows 4. Press the SELECT/ADJUST [ ] button two times. Notice that with each press, the blinking digit moves one position to the §...

  • Page 15: Instrument Settings

    The SENSE setting selects 2-wire or 4-wire (remote sensing) for the voltage source circuitry. 1. If the OUTPUT On indicator is lit, disable the DC205 OUTPUT by pressing the [On/Off] button. 2. Connect a pair of banana test leads from the red and black SENSE terminals on the DC205 to the input HI, LOW terminals on the multimeter.

  • Page 16: Isolation

    Even 10 mΩ of lead resistance in this case will lead to a 200 μV potential drop. By enabling remote sensing in the 4-Wire mode, the DC205 controls the potential as measured by the sense leads. By carefully arranging...

  • Page 17: Scanning

    1.5 Instrument settings 1 – 7 the test lead to the back of the red HI banana lead at the DC205. Notice that the multimeter still displays +1.0000 V, even though the HI terminal is now connected to chassis ground. The out- put of the DC205 is configured to float;...
  • Page 18 0.5 V by pressing [0], [.], [5], [Enter/Start]. Then turn the output On by pressing [On/Off]. The multimeter should display a value close to 0.5000 V. 12. Now press and hold the [Setup Arm] button for at least 3 sec- DC205 Precision DC Voltage Source...
  • Page 19 13. While the scan is running, notice that the multimeter and the DC205 display are both smoothly sweeping from 0.1 V to 0.8 V. After 10 seconds, the scan should end and the output voltage settles at 0.8 V.

  • Page 20: Interlock

    ±100 V, capable of caus- ing injury or death. Figure 1.1: The DC205 rear panel, shown with an interlock defeat plug. For safety, the ±100 V range can only be enabled when the interlock signal is asserted.

  • Page 21: Operation

    2 Operation This chapter provides a basic overview of the DC205 Precision DC Voltage Source. In This Chapter 2.1 Navigating the front panel ....2 – 2 2.1.1...

  • Page 22: Navigating The Front Panel

    Figure 2.1: The DC205 front panel. 2.1.1 Power When the DC205 is connected to an AC power source, the power supply will initially be in standby mode, indicated by the Standby indicator in the POWER section. To turn the DC205 on, press and hold the [ ] button until Standby is no longer lit, and the rest of the display comes on.
  • Page 23 Pressing and holding the Input [ ] button while turning on power will restore the factory default configuration of the DC205. In ad- dition to putting the instrument into the default configuration (see *RST), this will also erase any saved field calibration data, and reset the communications settings to factory defaults.

  • Page 24: Range

    [Cancel] button is pressed. 2.1.2 Range The Range button controls the DC205 output range setting. Each press of [Range] will advance through the settings ±1 V, ±10 V, and ±100 V. Pressing [Range] while in the ±100 V setting cycles back to ±1 V.

  • Page 25: Numeric Entry

    2.1.4 Numeric Entry The numeric entry keypad is used to directly enter voltage settings to the DC205. Values are implicitly positive unless the [+/−] button is pressed, which will toggle the sign between positive and negative. When entering a voltage setting through the numeric keypad, the range limits are implicitly enforced during entry.

  • Page 26: Sense

    2.1.5 Sense The [2 or 4 Wire] button in the SENSE block controls whether the DC205 uses local or remote feedback for controlling the voltage at the load. Pressing [2 or 4 Wire] toggles between 2-wire and 4-wire. This op- eration can be performed at any time, regardless of the state of the output.

  • Page 27: Scan

    Once armed, scans can also be started by applying a falling edge to the −TRIG In BNC connector on the DC205 rear panel, or the remote *TRG command. 2.1.8 Output The [On/Off] button in the OUTPUT block controls whether the volt-...

  • Page 28: Status

    Operation Pressing the [On/Off] button toggles between the On state and dis- abled state. When disabled, the DC205 loosely ties the HI and LO output terminals together through a 10 MΩ resistance. Note that the output cannot be enabled when the range is ±100 V unlesss the safety interlock is asserted.
  • Page 29 When these input terminals are active, the SENSE indicator just above the terminals will be illuminated. Note that when 4-wire mode is selected, the SENSE terminals are weakly connected to the output HI and LO terminals through internal DC205 Precision DC Voltage Source...

  • Page 30: Theory Of Operation

    2.2 Theory of operation 2.3 Scanning 2.4 Error messages When the DC205 first turns on, it performs a number of internal self- checks before beginning operation. If one of these fails, the following error messages may appear on the numeric display.

  • Page 31: Remote Operation

    3 Remote Operation This chapter describes operating the DC205 over the remote inter- faces. In This Chapter Index of commands ....3 – 2 Alphabetic list of commands .

  • Page 32: Index Of Commands

    3 – 13 Key clicks ALRM(?) {z} 3 – 13 Audible alarms Interface *IDN? 3 – 14 Identify TOKN(?) {z} 3 – 14 Token Mode *OPC(?) 3 – 14 Operation complete *RST 3 – 14 Reset DC205 Precision DC Voltage Source...
  • Page 33 3 – 16 Standard event status *ESE(?) [i,] {j} 3 – 16 Standard event status enable *CLS 3 – 16 Clear status LEXE? 3 – 16 Last execution error LCME? 3 – 17 Last command error DC205 Precision DC Voltage Source...

  • Page 34: Alphabetic List Of Commands

    3 – 11 Scan Ending Voltage SCAR(?) {z} 3 – 10 Scan Range SCAS(?) {z} 3 – 12 Scan Shape SCAT(?) {f } 3 – 11 Scan Time SENS(?) {z} 3 – 9 Remote Sensing DC205 Precision DC Voltage Source...
  • Page 35 3.2 Alphabetic list of commands 3 – 5 SOUT(?) {z} 3 – 9 Output TOKN(?) {z} 3 – 14 Token Mode VOLT(?) {f } 3 – 10 DC voltage DC205 Precision DC Voltage Source...

  • Page 36: Introduction

    3 – 6 Remote Operation 3.3 Introduction Remote operation of the DC205 is through a simple command lan- guage documented in this chapter. Both set and query forms of most commands are supported, allowing the user complete control of the voltage source from a remote computer through USB or RS-232, or through the optical fiber and the SX199 interface to GPIB, RS-232, or...

  • Page 37: Commands

    RESP SLOW RESP 1 —or— For queries that return token values, the return format (keyword or integer) is specified with the TOKN command. DC205 Precision DC Voltage Source...

  • Page 38: Notation

    In these examples, all data sent by the host computer to the DC205 are set as straight teletype font, while responses received by the host computer from the DC205 are set as slanted teletype font. The usage examples vary with respect to set/query, optional parame- ters, and token formats.

  • Page 39: Configuration Commands

    2)}. The RNGE command is equivalent to pressing the [Range] button. RNGE sets the output range of the DC205 to one of the three range settings: ±1 V, ±10 V, or ±1000 V. Note that at each range, the source can be set to ±101 % of the nominal full scale.

  • Page 40: Setting Commands

    The VOLT command is equivalent to the front panel numeric entry keypad. Example: VOLT 1.25e-2 3.4.6 Scan commands The DC205 can perform linear voltage scans, either as a single-shot or indefinitely repeating pattern. The following commands provide the remote interface to this capability. SCAR(?) {z} Scan Range Set (query) the scan range {to z=(RANGE1 0, RANGE10 1, RANGE100 2)}.
  • Page 41 SCAT. The SCAT command is equivalent to the entry field under SCAN Setup. Example: SCAT 3600 DC205 Precision DC Voltage Source...
  • Page 42 When a scan is in progress, the display can either show a (near) real time update of the output voltage, or it can be configured to remain static, displaying The SCAD command is equivalent to the entry field under SCAN setup. DC205 Precision DC Voltage Source...

  • Page 43: Setup Commands

    Set (query) the scan armed mode {to z=(OFF 0, ON 1)}. Setting SCAA ON will arm the scan. In order to successfully arm the scan, the DC205 must already have the output enabled. Also, the present range setting (RNGE) must match the programmed scan range (SCAR).
  • Page 44 Set (query) the token response mode {to z=(OFF 0, ON 1)}. Token response mode controls the formatting of response messages generated by the DC205 to remote queries of token-type values. When TOKN OFF, the DC205 responds with the numeric version of the token quantity.

  • Page 45: Status Commands

    Example: OVLD? *STB? [i] Status byte Reads the Status Byte register [bit i]. Example: *STB? *SRE(?) [i,] {j} Service request enable Set (query) the Service Request Enable register [bit i] {to j}. Example: *SRE 0,1 DC205 Precision DC Voltage Source...
  • Page 46 Wrong token Invalid bit Queue full Not compatible Example: CURR 12.0; LEXE?; LEXE? The error (1, “Illegal value,”) is because the parameter value (12.0) is too large for CURR. The second read of LEXE? returns 0. DC205 Precision DC Voltage Source...
  • Page 47 Extra parameter(s) Null parameter(s) Parameter buffer overflow Bad floating-point Bad integer Bad integer token Bad token value Bad hex block Unknown token Example: *IDN LCME? The error (4, “Illegal set”) is due to the missing “?”. DC205 Precision DC Voltage Source...

  • Page 48: Status Model

    At power-on, all status registers are cleared. 3.5.1 Status byte (SB) The Status Byte is the top-level summary of the DC205 status model. When enabled by the Service Request Enable register, a bit set in the Status Byte causes the MSS (Master Summary Status) bit to be set.

  • Page 49: Service Request Enable (Sre)

    3.5.3.1 Standard event status enable (ESE) The ESE acts as a bitwise AND with the ESR register to produce the single-bit ESB message in the Status Byte Register (SB). The register can be set and queried with the *ESE(?) command. DC205 Precision DC Voltage Source...
  • Page 50 3 – 20 Remote Operation At power-on, this register is cleared. DC205 Precision DC Voltage Source...

  • Page 51: Field Calibration

    4 Field Calibration This chapter provides instructios for calibrating the DC205 Precision DC Voltage Source in the field. In This Chapter 4.1 Introduction to Field Calibration ... 4 – 2 4.2 Equipment needed .

  • Page 52: Introduction To Field Calibration

    4 – 2 Field Calibration 4.1 Introduction to Field Calibration 4.2 Equipment needed 4.3 Detailed procedure DC205 Precision DC Voltage Source...

  • Page 53: Power Entry Module

    Appendix A Fuse Installation and ac Line Select The DC205 operates from 100 V, 120 V, 220 V, or 240 V nominal ac power having a line frequency of 50 Hz or 60 Hz, and requires met- ric size dual fuses for operation. This appendix provides detailed instructions for modifying the input voltage selection and replacing the line fuse.
  • Page 54 5. Replace the wheel into the power entry module and close the covor door, ensuring the selected voltage appears in the win- dow. 6. If necessary, replace the fuse for the appropriate rating based on line voltage. DC205 Precision DC Voltage Source...

  • Page 55: Fuse Installation

    A.3 Fuse installation A – 3 A.3 Fuse installation The DC205 uses metric dual fuse installation. When installing or replacing, be sure to replace both fuses. The following steps describe how to install or replace the fuse: 1. Disconnect and remove the power cord.

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