Keysight Technologies E3633A Service Manual
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Keysight Technologies E3633A Service Manual

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  • Page 1 Keysight E3633A and E3634A DC Power Supplies Service Guide...
  • Page 2 FAR 27.401 or DFAR could result in personal injury or death. 227.7103-5 (c), as applicable in any Do not proceed beyond a WARNING technical data. notice until the indicated conditions are fully understood and met. Keysight E3633A and E3634A Service Guide...

  • Page 3: Safety Symbols

    Warning or Caution Direct current (DC) information) Alternating current (AC) Protective earth (ground) terminal Out position of a bi-stable push control In position of a bi-stable push control Positive binding post Negative binding post Keysight E3633A and E3634A Service Guide...

  • Page 4: Regulatory Markings

    Communications and Media Authority. Directives. This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste. Keysight E3633A and E3634A Service Guide...

  • Page 5: Waste Electrical And Electronic Equipment (Weee) Directive

    To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/powersupply (product-specific information and support, software and documentation updates) – www.keysight.com/find/assist (worldwide contact information for repair and service) Keysight E3633A and E3634A Service Guide...
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  • Page 7: Table Of Contents

    ........21 Keysight E3633A and E3634A Service Guide...
  • Page 8 ......... . . 56 Keysight E3633A and E3634A Service Guide...
  • Page 9 ....... .68 Performance Test Record for Keysight E3633A and E3634A .
  • Page 10 ........117 Keysight E3633A and E3634A Service Guide...
  • Page 11 ......125 Component Locator for the front panel (serial MY53xx6xxx) ..126 Keysight E3633A and E3634A Service Guide...
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  • Page 13 List of Figures Figure 1-1 Dimensions of Keysight E3633A and E3634A power supplies ......21...
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  • Page 15 ......116 Table 5-2 Bias supplies voltages ......116 Keysight E3633A and E3634A Service Guide...
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  • Page 17 Keysight E3633A and E3634A DC Power Supplies Service Guide Specifications Performance Specifications Supplemental Characteristics The performance specifications are listed in the following pages. Specifications are warranted in the temperature range of 0 to 40°C with a resistive load. Supplemental characteristics, which are not warranted but are descriptions of performance determined either by design or testing.

  • Page 18: Specifications

    1 mA (< 10A), 10mA (. 10A) [a] Accuracy specifications are after an 1-hour warm-up with no load and calibration at 25 °C. [b] This specification may degrade when the unit is subjected to an RF field >= 3V/meter. Keysight E3633A and E3634A Service Guide...

  • Page 19: Transient Response Time

    Average time for output to start to drop after OVP and OCP condition occurs. <1.5 msec when the trip voltage is equal or greater than 3 V <10 msec when the trip voltage is less than 3 V <10 msec Keysight E3633A and E3634A Service Guide...

  • Page 20: Supplemental Characteristics

    Subtract voltage drop in load leads from specified output voltage rating. Temperature coefficient, ±(% of output + offset) Maximum change in output/readback per °C after a 30-minute warm-up Vol tage 0.01% + 3 mV Current 0.02% + 3 mA Keysight E3633A and E3634A Service Guide...

  • Page 21: Stability, ±(% Of Output + Offset)

    (+) output to the (+) sense and the (-) output and the (-) sense terminals. ±240 Vdc when connecting insulated shorting conductors to the (+) output to the (+) sense and the (-) output and the (-) sense terminals. Keysight E3633A and E3634A Service Guide...

  • Page 22: Ac Input Ratings

    Designed to operate at a maximum relative humidity of 95 % and at altitudes of up to 2000 meters. Dimensions 213 mmW x 133 mmH x 348 mmD (8.4 x 5.2 x 13.7 in) [1] See below for detailed information Keysight E3633A and E3634A Service Guide...

  • Page 23: Weight

    9.5 kg (21 lb) Shipping 12 kg (26 lb) Weight (MY53xx6xxx) 11.4 kg (E3633A) 10.9 kg (E3634A) Shipping 13.9 kg (E3633A) 13.4 kg (E3634A) Figure 1-1 Dimensions of Keysight E3633A and E3634A power supplies Keysight E3633A and E3634A Service Guide...
  • Page 24 Specifications THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight E3633A and E3634A Service Guide...

  • Page 25: Quick Start

    Keysight E3633A and E3634A DC Power Supplies Service Guide Quick Start Quick StartQuick Start To prepare the Power Supply for Use To Check the Rated Voltages of the Power Supply To Check the Rated Currents of the Power Supply To Use the Power Supply in Constant Voltage Mode...

  • Page 26: Quick Startquick Start

    The desired output range is selected from the front panel or over the remote interfaces. The 8V or 20V for the E3633A and 25V or 50V for the E3634A annunciator indicates the presently selected range.
  • Page 27 If, however, the power supply is remotely controlled, the Rmt annunciator will also turn on, and when the power supply is being addressed over HPIB interface, the Adrs annunciator will turn on. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 28: To Prepare The Power Supply For Use

    1 Check the list of supplied items. Verify that you have received the following items with your power supply. If anything is missing, contact your nearest Keysight Technologies Sales Office. – One power cord for your location. – This User’s Guide.
  • Page 29 Notice that the display is in the meter mode. “Meter mode” means that the display shows the actual output voltage and current. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 30 3 Rotate the power-line vol tage selector until the correct 4 Replace the power-line vol tage selector and the voltage appears. fuse-holder assembly in the rear panel. Install the correct fuse and verify that the correct line voltage appears in the NOTE window. Keysight E3633A and E3634A Service Guide...

  • Page 31: To Check The Rated Voltages Of The Power Supply

    “25.0 volts” You can use the resolution selection keys to move the flashing digit to the right NOTE or left when setting the voltage. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 32: To Check The Rated Currents Of The Power Supply

    Check that the ammeter responds to knob control and the voltmeter indicates nearly zero (actually, the voltmeter will show the voltage drop caused by the test lead) [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 33 If an error has been detected during the output checkout procedures, the NOTE ERROR annunciator will turn on. See “Error Messages’’ for more information, starting on page 123 in chapter 5 of the User’s Guide. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 34: To Use The Power Supply In Constant Voltage Mode

    We recommend that you should set the display to “limit” mode to see the change of current limit value in the constant voltage mode whenever adjusting the knob. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 35 If you operate the power supply in the constant voltage (CV) mode, verify that the CV annunciator is lit. If the CC annunciator is lit, choose a higher current limit. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 36 You can use the resolution selection keys to move the flashing digit to the right NOTE or left when setting the current. Keysight E3633A and E3634A Service Guide...

  • Page 37: To Use The Power Supply In Constant Current Mode

    We recommend that you should set the display to “limit” mode to see the change of voltage limit value in the constant current mode whenever adjusting the knob. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 38 NOTE exceeded, the power supply will automatically crossover to constant voltage mode at the preset voltage limit and the output current will drop proportionately. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 39: To Store And Recall The Instrument State

    To cancel the store operation, let the display time-out after about 3 seconds or press any other function key except the ion key except the key. The power supply returns to the normal operating mode and to the function pressed. Save the operating state. Keysight E3633A and E3634A Service Guide...
  • Page 40 7 Restore the operating state. The power supply should now be configured in the same state as when you stored the state on the previous steps. DONE This message appears on the display for approximately 1 second. Keysight E3633A and E3634A Service Guide...

  • Page 41: To Program Overvoltage Protection

    You will see the above message on the display when you enter the OVP menu. Adjust the control knob for the desired OVP trip level. Note that you cannot set the trip levels to lower than 1.0 volt. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 42 The following steps show how to clear the overvoltage condition and get back to normal mode operation. In the following steps, the display will go back to “OVP TRIPPED” if you let the display time out after about several seconds. Keysight E3633A and E3634A Service Guide...
  • Page 43 3 Clear the overvoltage cond ition and exit this menu. Now, when you press key again, the “DONE” message is displayed for a second and the OVP annunciator will not blink any more. The output will return to meter mode. Keysight E3633A and E3634A Service Guide...
  • Page 44 3 Clear the overvoltage cond ition and exit this menu. Now, when you press key again, the “DONE’’ message is displayed for a second and the OVP annunciator will not blink any more. The output will return to the meter mode. Keysight E3633A and E3634A Service Guide...

  • Page 45: To Program Overcurrent Protection

    You will see the above message on the display when you enter the OCP menu. Adjust the knob for the desired OCP trip level. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 46 The following steps show how to clear the overcurrent condition and get back to normal mode operation. In the following steps, the display will go back to “OCP TRIPPED” if you let the display time out after about several seconds. Keysight E3633A and E3634A Service Guide...
  • Page 47 OCP annunciator will not blink any more. The output will return to meter mode. The knob is selected for current control. Notice that the power supply is operated in the constant current (CC) mode. Keysight E3633A and E3634A Service Guide...
  • Page 48 3 Clear the overcurrent cond ition and exit this menu. Now, when you press again, the “DONE” message is displayed for a second and the OCP annunciator will not blink any more. The output will return the meter mode. Keysight E3633A and E3634A Service Guide...

  • Page 49: To Rack Mount The Power Supply

    Option 1CM (P/N 5063-9243). Installation instructions and hardware are included with each rack-mounting kit. Any Keysight System II instrument of the same size can be rack-mounted beside the Keysight E3633A or E3634A DC power supply. Remove the front and rear bumpers before rack-mounting the power supply.
  • Page 50 To rack mount two instruments of the same depth side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9214. To install two instruments in a slid ing support shel f, order support shel f 5063-9256, and slide kit 1494-0015. Keysight E3633A and E3634A Service Guide...
  • Page 51 Performance Verification Tests Measurement Techniques Constant Voltage (CV) Verifications Constant Current (CC) Verifications Common Mode Current Noise Performance Test Record for Keysight E3633A and E3634A Calibration Security Code Calibration Count Calibration Message General Calibration/ Adjustment Procedure Aborting a Calibration in Progress...

  • Page 52: Calibration Procedures

    1 year for any application. Keysight Technologies recommends that complete re-adjustment should always be performed at the calibration interval. This will increase your confidence that the Keysight E3633A and E3634A will remain within specification for the next calibration interval. This criteria for re-adjustment provides the best long-term stability.

  • Page 53: Automating Calibration Procedures

    For further details on programming the power supply, see chapters 3 and 4 in the Keysight E3633A and E3634A User’s Guide. Test Considerations To ensure proper instrument operation, verify that you have selected the correct power-line voltage prior to attempting any test procedure in this chapter.

  • Page 54: Recommended Test Equipment

    (0.01 Ω, 0.1%) monitoring Model: A-H resistor (shunt) [a] For Keysight E3633A Model [b] For Keysight E3634A Model [c] It is recommended to use a current monitoring resistor after calibration to find the accurate resistance. Keysight E3633A and E3634A Service Guide...

  • Page 55: Performance Verification Tests

    You can also perform a self-test from the remote interface (see chapter 3 in the Keysight E3633A and E3634A User’s Guide). – If the self-test is successful, “PASS” is displayed on the front panel. – If the self-test fails, “FAIL” is displayed and the ERROR annunciator turns on. If repair is required, see chapter 5, “Service”, for further details.

  • Page 56: Measurement Techniques

    Substitution of the electronic load requires minor changes to the test procedures in this chapter. Keysight E3633A and E3634A Service Guide...

  • Page 57: General Measurement Techniques

    (-) output terminal and the load as a four-terminal device. Connect the current-monitoring leads inside the load-lead connections directly at the monitoring points on the resistor element (see R Figure 3-1). Keysight E3633A and E3634A Service Guide...

  • Page 58: Programming

    The test procedures are written assuming that you know how to program the power supply either from the front panel or from an GPIB or RS-232 controller. Complete instructions on front panel and remote programming are given in the Keysight E3633A and E3634A User’s Guide. Keysight E3633A and E3634A Service Guide...

  • Page 59: Constant Voltage (Cv) Verifications

    3 Program the output voltage to zero volt and current to full rated value (10.0 A) or (4.0 A) by sending the commands: VOLT 0 CURR 10 (E3633A) CURR 4 (E3634A) [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 60 10 Record the value displayed on the controller. This value should be within the limit of (DVM ± 15 mV) or (DVM ± 30 mV) [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 61: Cv Load Effect (Load Regulation)

    (3) and (4) is the CV load regulation. The difference of the readings during the immediate change should be within the limit of (4 mV) or (7 mV) [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 62: Cv Source Effect (Line Regulation)

    (5) and (6) is the CV line regulation. The difference of the readings during the immediate change should be within the limit of (4 mV) or (7 mV) [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 63: Cv Pard (Ripple And Noise)

    5 Disconnect the oscilloscope and connect the ac rms voltmeter in its place according to the VRMS measurement techniques above. The rms voltage reading does not exceed the rms limit of 0.35 mV or 0.5 mV [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 64: Load Transient Response Time

    (t2 - t1) of the transients at 15 mV from the base line is no more than 50 μsec for the output. Figure 3-3 Transient response time [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 65: Constant Current (Cc) Verifications

    2 Turn on the power supply. Select the 8V/20A or 25V/7A range and enable the output by sending the commands: (E3633A) VOLT:RANG P8V (E3634A) VOLT:RANG P25V OUTP ON [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 66 This value should be within the limit of (20 A ± 50 mA) or (7A ± 24 mA) 9 Readback the output current over the remote interface by sending the command: MEAS:CURR? [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 67: Cc Load Effect (Load Regulation)

    (3) and (4) is the load regulation current. The difference of the readings during the immediate change should be within the limit of (2.25 mA) or (0.95 mA) [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 68: Cc Source Effect (Line Regulation)

    (5) and (6) is the load regulation current. The difference of the readings during the immediate change should be within the limit of (2.25 mA) or (0.95 [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 69: Cc Pard (Ripple And Noise)

    4 Divide the reading on the rms voltmeter by the load resistance to obtain rms current. The readings should be within the limit of 2 mA. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 70: Common Mode Current Noise

    4 Record the voltage across R and convert it to current by dividing by the resistance (DVM reading/100 kΩ). Note that the current is less than 1.5 μA. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 71: Performance Test Record For Keysight E3633A And E3634A

    Calibration Procedures Performance Test Record for Keysight E3633A and E3634A CV performance test record Specifications Actual Test Description Models Result Upper Limit Lower Limit CV Programming Accuracy @ 0 volts Both +0.0100 V -0.0100 V (DVM reading) CV Readback Accuracy @ 0 volts Both DVM + 0.0050 V...

  • Page 72: Cc Performance Test Records

    Maximum change: < (2.25 mA) or (0.95 mA) CC PARD (Normal mode) Both < 2 mA rms μ CC PARD (Common mode) Both < 1.5 A rms [a] For Keysight E3633A Model [b] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 73: Calibration Security Code

    NOTE jumper inside the power supply, and then entering a new code. See“To unsecure the power supply without the security code” on page 76 [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 74: To Unsecure The Power Supply For Calibration

    – To enter the security code from the front panel, enter only the last six digits. – To enter the security code from the remote interface, you may enter up to 12 characters. [1] For Keysight E3633A Model [2] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...
  • Page 75 5 Turn off the calibration mode. Turn off the power supply to exit the calibration mode. To re-secure the power supply (following calibration), perform this procedure NOTE again. Keysight E3633A and E3634A Service Guide...

  • Page 76: To Unsecure The Power Supply Without The Security Code

    [1] For serial MY53xx6xxx, apply a short between the two exposed metal pads on JP102 (located near U103). The JP102 is outlined with a circle on the component locator drawing on page 128 [2] For serial MY53xx6xxx, remove the short at JP102. Keysight E3633A and E3634A Service Guide...

  • Page 77: Calibration Count

    – The calibration count increments up to a maximum of 32,767 after which it wraps around to 0. No way is provided to program or reset the calibration count. Keysight E3633A and E3634A Service Guide...

  • Page 78: Calibration Message

    Change the security code CAL:SEC:CODE <new code> Store the calibration message CAL:STR <quoted string> Query the calibration information CAL:STR? See “Calibration Overview”, starting on page 68 in chapter 3 of the User’s Guide for more details. Keysight E3633A and E3634A Service Guide...

  • Page 79: General Calibration/ Adjustment Procedure

    You can terminate any CAL SETUP without changing its calibration constants by NOTE turning off power. Perform the voltage calibration prior to the OVP calibration and the current NOTE calibration prior to the OCP calibration. Keysight E3633A and E3634A Service Guide...

  • Page 80: Front Panel Voltage And Current Calibration

    The “START BITCAL” message is displayed for about 3 seconds to indicate that the power supply is ready for DAC calibration. Then it counts down numbers from 30 to 0. Then, the display shows the low voltage calibration point. V LO 0.5000V Keysight E3633A and E3634A Service Guide...
  • Page 81 If the entered number is not correct, an “MIN VALUE” or “MAX VALUE” message appears for one second and the display shows the middle voltage calibration point again. The display now shows the high voltage calibration point. Keysight E3633A and E3634A Service Guide...
  • Page 82 “CAL SETUP 2” for OVP calibration again. Connect an appropriate shunt 0.01 Ω across the output terminals, and connect a NOTE digital voltmeter across the shunt resistor for the current calibration. Keysight E3633A and E3634A Service Guide...
  • Page 83 For example, if the computed value is 9.999 A, adjust the current to 9.999 A using the knob and arrow keys. Notice that you should wait for the DVM reading to stabilize for accurate calibration. I MI 09.999 A Keysight E3633A and E3634A Service Guide...
  • Page 84 OCP calibration. If the calibration fails, an “DAC CAL FAIL” or “ADC CAL FAIL” message appears for one second and the display shows the “CAL SETUP 3” for current calibration again. Keysight E3633A and E3634A Service Guide...

  • Page 85: Aborting A Calibration In Progress

    When performing a calibration from the remote interface, you can abort a calibration by issuing a remote interface device clear message or by pressing the front-panel “Local” key. Keysight E3633A and E3634A Service Guide...

  • Page 86: Calibration Record For Keysight E3633A/E3634A

    “CAL SETUP 4” now appears on the display (press “Calibrate” key). OCP calibration Press “Calibrate” key, then press “Power” switch. Exit CAL MODE [a] For Keysight E3633A Model [b] For Keysight E3634A Model Keysight E3633A and E3634A Service Guide...

  • Page 87: Error Messages

    Calibration Procedures Error Messages The following tables are abbreviated lists of error messages for the E3633A and E3634A. The errors listed are the most likely errors to be encountered during calibration and adjustment. A more complete list of error messages and descriptions is contained in chapter 5 of the E3633A and E3634A User’s Guide.
  • Page 88 Unable to sense line frequency I/O processor does not respond I/O processor failed self-test Fan test failed System DAC test failed Hardware test failed [a] This error message is only applicable for serial MY53xx6xxx. Keysight E3633A and E3634A Service Guide...
  • Page 89 Cal checksum failed, store/recall data in location 3 Cal checksum failed, DAC cal constants Cal checksum failed, readback cal constants Cal checksum failed, GPIB address Cal checksum failed, internal data Cal checksum failed, DAC DNL error correction data Keysight E3633A and E3634A Service Guide...

  • Page 90: An Example Program Of Excel 97 For Calibration

    GPIB interface. This program makes software adjustments to the E3633A power supply using a current shunt and a digital multimeter which is connected to the controller. In this program a 0.001 ohm current shunt is used.
  • Page 91 ClosePort Exit Sub End If shunt = 0.001 'Change the current shunt value UserAnswer = MsgBox(“Voltage & OVP calibration. Connect the output to the DMM”, vbYesNo + vbQuestion, “E3633A Calibration”) If UserAnswer = vbNo Then ClosePort Exit Sub End If Range("B4").Select...
  • Page 92 OpenPort = True End Function Private Function InitializeDevice() SendSCPI power, "*Cls" SendSCPI DMM, "*Rst" 'Set power-on condition for DMM SendSCPI power, "*Rst" 'Set power-on condition for power supply End Function Continued on next page Keysight E3633A and E3634A Service Guide...
  • Page 93 End Function Private Function delay(delay_time As Single) 'This routine is used to create delays Dim Finish As Single Finish = Timer + delay_time Loop Until Finish <= Timer End Function Continued on next page Keysight E3633A and E3634A Service Guide...
  • Page 94 Message = SendSCPI(power, "Syst:Err?") If InStr(Message, "0") Then ActiveCell.Value = "DAC DNL Error Correction completed for power supply" DacErrorCorrection = True Else ActiveCell.Value = Message DacErrorCorrection = False End If End Function Continued on next page Keysight E3633A and E3634A Service Guide...
  • Page 95 ActiveCell.Value = " Begin OCP Calibration" SendSCPI power, "Cal:Curr:Prot" 'Perform OCP circuit calibration End If delay 9 SendSCPI power, "Output Off" 'Turn off the power supply output End Function Continued on the next page Keysight E3633A and E3634A Service Guide...
  • Page 96 Message = "Cal:Str " & Chr(34) & Date & Chr(34) SendSCPI power, Message Message = SendSCPI(power, "Cal:Str?") Range("B5").Select ActiveCell.Value = Message Message = SendSCPI(power, "Cal:Count?") Range("B6").Select ActiveCell.Value = Message Range("B4").Select End Function End of program Keysight E3633A and E3634A Service Guide...
  • Page 97 Declare Function viWrite Lib "visa32.dll" (ByVal vi As Long, ByVal Buffer As String, ByVal count As Long, retCount As Long) As Long Declare Function viRead Lib "visa32.dll" (ByVal vi As Long, ByVal Buffer As String, _ByVal count As Long, retCount As Long) As Long Keysight E3633A and E3634A Service Guide...
  • Page 98 Calibration Procedures THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight E3633A and E3634A Service Guide...
  • Page 99 It is assumed in the following discussions that you are familiar with the operating and programming instructions presented in the E3633A and E3634A User’s Guide. Subjects covered include the following:...

  • Page 100: Theory Of Operation

    Separate reference and bias supplies are provided for the floating and ground reference circuitry. The front panel operates from the floating circuitry with its logic common different from the main controller logic common. Keysight E3633A and E3634A Service Guide...

  • Page 101: Block Diagram

    Theory of Operation Block diagram Keysight E3633A and E3634A Service Guide...

  • Page 102: Ac Input And Bias Supplies

    This signal is generally active only following application of line power to the instrument. The +5V dc earth referenced supply is produced by rectifier CR4, filter capacitor C23, and regulator U9. The GPIB (IEEE-488) and RS-232 computer interfaces are powered from this supply. Keysight E3633A and E3634A Service Guide...

  • Page 103: Floating Logic

    The counter register is used to capture the ADC slope count at the COMP input. The COMP input functions as both a clocked comparator and the slope counter input for the ADC. In both cases the counter register captures the lower 8 bits of a Keysight E3633A and E3634A Service Guide...
  • Page 104 11-bit frame at a rate of 187.5 k bits/ second. When the RS-232 interface is selected, data is sent across the isolated link at 93.75 k bits/second. The 11-bit data frame is configured for one start bit, eight data bits, one control bit, and one stop bit. Keysight E3633A and E3634A Service Guide...

  • Page 105: D-To-A Converter

    U26. Each track/hold amplifier is refreshed approximately every 1 msec to maintain its output setting. Changes to track/hold amplifier outputs are accomplished by dwelling on that position for an extended period. Keysight E3633A and E3634A Service Guide...

  • Page 106: A-To-D Converter

    U40 provides a stable +5 V reference voltage for ADC. U31A amplifies the voltage reference to +10 V while amplifier U31B inverts the +10 V reference to -10 V. The reference voltage forces precision slope currents for the integrating ADC through R72 and R98. Keysight E3633A and E3634A Service Guide...

  • Page 107: Power Mesh And Control

    For any given value of load resistance, the power supply must act either as a constant voltage source or as a constant current Keysight E3633A and E3634A Service Guide...

  • Page 108: Earth-Referenced Logic

    C3 and C9. Communication between the earth referenced logic interface circuits and the floating logic is accomplished through an optically-isolated bi-directional serial interface. Isolator U5 couples data from U1 to processor U19. Isolator U2 couples data from U19 to microprocessor U1. Keysight E3633A and E3634A Service Guide...

  • Page 109: Front Panel

    P0.0 through P0.3 to poll each key column for a key press. Column read-back data are read by the microprocessor at port pins P1.0 through P1.3 for decoding and communication to the floating logic circuits. Keysight E3633A and E3634A Service Guide...
  • Page 110 Theory of Operation THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight E3633A and E3634A Service Guide...

  • Page 111: Service

    Keysight E3633A and E3634A DC Power Supplies Service Guide Service Operating Checklist Types of Service Available Repacking for Shipment Electrostatic Discharge (ESD) Precautions Surface Mount Repair To Replace the Power-Line Fuse To Disconnect the Output Using an External Relay Troubleshooting Hints...

  • Page 112: Operating Checklist

    – Verify that the correct power-line voltage is selected. “To prepare the Power Supply for Use” on page 28. – Remove all load connections to the power supply. Ensure that all terminal connections are removed while the self-test is performed. Keysight E3633A and E3634A Service Guide...

  • Page 113: Types Of Service Available

    Keysight. – If your 3-year warranty has expired, Keysight will bill you for the Keysight E3633A or E3634A exchange price - less than a new unit price. Keysight warrants exchange units against defects for 90 days.

  • Page 114: Repacking For Shipment

    Repacking for Shipment For the Express Exchange Service described on the previous page, return your failed Keysight E3633A or E3634A to the designated Keysight Service Center using the shipping carton of the exchange unit. A shipping label will be supplied.

  • Page 115: Electrostatic Discharge (Esd) Precautions

    (see page 24). For 100 or 115 Vac operation, you must use a 6.3 A slow-blow fuse (HP part number 2110-1030). For 230 Vac operation, you must use a 3.15 A slow-blow fuse (HP part number 2110-1031). Keysight E3633A and E3634A Service Guide...

  • Page 116: To Disconnect The Output Using An External Relay

    3 Reassemble the power supply. [1] For serial MY53xx6xxx, install JP001 and JP002 located adjacent to the connector CN001 (the JP001 and JP002 are outlined with a circle in the component locator diagram onpage 127). Keysight E3633A and E3634A Service Guide...

  • Page 117: Troubleshooting Hints

    These errors may be produced if you accidentally turn off power of the unit during a calibration or while changing a non-volatile state of the instrument. Recalibration or resetting the state should clear the error. If the error persists, a hardware failure may have occurred. Keysight E3633A and E3634A Service Guide...

  • Page 118: Unit Fails Self-Test

    Always check that the power supplies are free of ac oscillations using an oscilloscope. Failure of bias supplies will cause many self-test failures. [1] For serial MY53xx6xxx, failure of the DAC U104 on the PC board will cause many self-test failures. Keysight E3633A and E3634A Service Guide...

  • Page 119: Self-Test Procedures

    The main controller issues an A/D sync pulse to U19 and U20 to latch the value in the ADC slope counters. A failure is detected when a sync interrupt is not recognized and subsequent time-out occurs. Keysight E3633A and E3634A Service Guide...
  • Page 120 System ADC test failed This test checks if the ADC hardware is functional. The main controller U101 establishes communication with the ADC and checks if there are any error bits set for the ADC's status reporting. Keysight E3633A and E3634A Service Guide...
  • Page 121 Hardware test failed This test checks the status of voltage and current error amplifiers for the power circuit. If both amplifiers are not operational, the power supply will beep and the error annunciator will be on. Keysight E3633A and E3634A Service Guide...
  • Page 122 Service THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight E3633A and E3634A Service Guide...

  • Page 123: E3633-60002/E3634-60002 Component Locator For The Main Board

    E3633-60019/E3634-60019 Component locator for the main board (serial MY53xx6xxx) Component locator for the front panel (serial MY53xx6xxx) This chapter contains component locator drawings for the power supply. The block diagram is also shown in Chapter 4, "Theory of Operation". Keysight E3633A and E3634A Service Guide...
  • Page 124 Component Drawings THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight E3633A and E3634A Service Guide...
  • Page 129 This information is subject to change without notice. Always refer to the English version at the Keysight website for the latest revision. © Keysight Technologies 1998 - 2019 Edition 9, March 26, 2019 Printed in Malaysia *E3634-90010* E3634-90010...

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