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Fluke 5790B Service Manual

Ac measurement standard
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Download this manual See also: Operator's Manual
Via Acquanera, 29
22100 Como
tel. 031.526.566 (r.a.) fax 031.507.984
info@calpower.it
www.calpower.it
October 2016
© 2016 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
5790B
AC Measurement Standard
Service Manual

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Summary of Contents for Fluke 5790B

  • Page 1 22100 Como tel. 031.526.566 (r.a.) fax 031.507.984 info@calpower.it www.calpower.it 5790B AC Measurement Standard Service Manual October 2016 © 2016 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
  • Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.

  • Page 3: Table Of Contents

    AC Secondary Performance .............. 1-13 DC Secondary Performance .............. 1-15 Operating Characteristics ..............1-16 AUX Input Characteristics ..............1-17 Absolute Wideband Specifications (5790B/3, 5790B/5, and 5790B/AF) 1-17 Theory of Operation ................2-1 Introduction .................... 2-1 Functional Block Diagram Discussion ........... 2-2 Digital Section Overview ...............
  • Page 4 Calibration ..................... 3-4 Calibrating (Calibration Adjustment) the Main Input ......3-4 Characterizing the DC Source ............3-5 Self-Calibrate a Fluke 752A Divider with a Fluke 8508A as the Null Detector ..................... 3-5 DC Voltage Source Characterization Values ........3-7 DC Calibration Adjustment ............3-12 AC Calibration Adjustment ............
  • Page 5 Contents (continued) Digital Section Cover ................. 4-6 Analog Section Covers ..............4-6 Rear Panel Removal and Installation ..........4-6 Front Panel Removal and Installation ..........4-7 Display Assembly Removal and Installation ........4-7 Keyboard Assembly Removal and Installation ........4-7 Analog Assembly Removal and Installation ........
  • Page 6 5790B Service Manual...

  • Page 7: Introduction And Specifications

    Chapter 1 Introduction and Specifications Introduction Refer to the 5790B Operators Manual (located on the Fluke Calibration website) for complete operating instructions, This manual provides performance test, calibration adjustment, theory of operation, troubleshooting, and repair procedures necessary to verify and maintain performance of the 5790B (the Product).

  • Page 8: Contact Fluke Calibration

    5790B Service Manual Contact Fluke Calibration To contact Fluke Calibration, call one of the following telephone numbers: • Technical Support USA: 1-877-355-3225 • Calibration/Repair USA: 1-877-355-3225 • Canada: 1-800-36-FLUKE (1-800-363-5853) • Europe: +31-40-2675-200 • Japan: +81-3-6714-3114 • Singapore: +65-6799-5566 •...
  • Page 9 Introduction and Specifications Safety Information • Make sure that the space around the Product meets minimum requirements. • Do not use test leads if they are damaged. Examine the test leads for damaged insulation, exposed metal, or if the wear indicator shows.

  • Page 10: Symbols

    Absolute Uncertainty Specifications to determine the ratios between the Product uncertainties and the uncertainties of a unit under test. The initial calibration at Fluke Calibration is done at 23 °C. The temperature of the last calibration can be verified at any time.

  • Page 11: General Specifications

    Introduction and Specifications General Specifications General Specifications Warm-up Time ..........30 minutes or twice the time the 5790B has been turned OFF. Relative Humidity Operating ............ ≤80 % to 30 °C, ≤70 % to 40 °C, ≤40 % to 50 °C Storage ............

  • Page 12: Resolution And Range Limits

    5790B Service Manual Resolution and Range Limits Autorange Limits Resolution Voltage Range Upper Lower Filter Fast Filter Med/Slow 2.2 mV 2.2 mV 600 μV 0.1 μV 0.1 μV 7 mV 7 mV 1.9 mV 0.1 μV 0.1 μV 22 mV...
  • Page 13 Introduction and Specifications Electrical Specifications ±5 °C of Calibration Temperature AC/DC Transfer Measurement Mode ± (ppm of Reading + μV) Voltage Range Frequency Range Mode ± ppm 90 Days 1 Year 2 Years 2 Years 10 Hz - 20 Hz 290 + 1.3 290 + 1.3 290 + 1.3...
  • Page 14 Typical specification, as determined by sourcing with the Fluke 5205A Precision Power Amplifier. Inputs >30 kHz and >750 V are typical, as determined by sourcing with the Fluke 5205A Precision Power Amplifier. Note: The Product is to be used in controlled environments. For disturbances on the mains power supply of >0.5 Vrms from 10 MHz to...

  • Page 15: Relative Ac Voltage

    Introduction and Specifications Electrical Specifications Relative AC Voltage ±5 °C of Calibration Temperature Voltage AC/DC Transfer Measurement Mode ± (ppm of Reading + μV) Frequency Range Range Mode ± ppm 2 90 Days 1 Year 2 Years Years 10 Hz - 20 Hz 100 + 1.3 110 + 1.3 110 + 1.3...
  • Page 16 Inputs >100 kHz and with a V*Hz product >2.2E7 are typical. Typical specification, as determined by sourcing with the Fluke 5205A Precision Power Amplifier. Inputs >30 kHz and >750 V are typical, as determined by sourcing with the Fluke 5205A Precision Power Amplifier. 1-10...

  • Page 17: Absolute Ac Non-Sine Voltage

    Introduction and Specifications Electrical Specifications Absolute AC Non-sine Voltage 1-Year, tcal ±5 °C, Range Frequency Range ±(% of reading + µV) 10 Hz - 45 Hz 0.1 + 1.3 45 Hz - 1 kHz 0.1+ 1.3 2.2 mV 1 kHz - 20 kHz 0.17+ 1.3 20 kHz - 100 kHz 0.5 + 2.5...

  • Page 18: Absolute Dc Voltage

    5790B Service Manual Absolute DC Voltage ± 5 °C of Calibration Temperature Voltage Range Measurement Mode ± (ppm of Reading + μV) 90 Days 1 Year 2 Years 37 + 1.5 38 + 1.5 43 + 1.5 220 mV 31 + 1.5 33 + 1.5...

  • Page 19: Secondary Electrical Specifications

    Introduction and Specifications Secondary Electrical Specifications Secondary Electrical Specifications Secondary performance specifications and operating characteristics are included in uncertainty specifications. They are provided for special calibration requirements such as stability or linearity tests. AC Secondary Performance Temperature Coefficient 24 Hour AC 0 °C to 10 °C Stability ±...
  • Page 20 5790B Service Manual Temperature Coefficient 24 Hour AC 0 °C to 10 °C Stability ± 1 °C Voltage Input 10 °C to 40 °C Frequency Range Range Slow Filter Peak- Resistance 40 °C to 50 °C Peak ± μV ppm / °C...

  • Page 21: Dc Secondary Performance

    Inputs with a V*Hz product >2.2 E7 are unspecified. Typical specification, as determined by sourcing with the Fluke 5205A Precision Power Amplifier. Inputs that are >30 kHz and >750 V are typical, as determined by sourcing with the Fluke 5205A Precision Power Amplifier. DC Secondary Performance Temperature Coefficient 0 °C to 10 °C...

  • Page 22: Operating Characteristics

    0.1200 MHz to 1.0000 MHz 1.0000 MHz to 1.1999 MHz 1.200 MHz to 11.999 MHz (Wideband only except 1.200 MHz to 1.209 MHz) 30.00 MHz 30.00 MHz to 50.00 MHz (Wideband 5790B/5 & 5790B/AF only) Reading Rate <40 Hz ............2 seconds per reading 40 Hz ..............

  • Page 23: Aux Input Characteristics

    Absolute Wideband Specifications (5790B/3, 5790B/5, and 5790B/AF) AUX Input Characteristics The AUX input can be used with the Fluke A40/A40A Series Current Shunts to make relative ac current measurements. The 5790A-7001 A40/A40A Current Shunt Adapter and Cable are required. For optimal current measurements using shunts, see the Operators Manual.
  • Page 24 5790B Service Manual Absolute Specifcations Flatness Flatness 0 °C to 50 °C 1 year ± Voltage Temperature Frequency Range 3 °C ± (% of Resolution ± (% of Reading + μV) Coefficient ppm Range Reading / °C 90 Days 1 Year 2 Years + μV)

  • Page 25: Maximum Non-Destructive Input

    VSWR ............. <1.05 typical 5790B/AF The 5790B/AF absolute specification is ±0.23 % of voltage reading (1 year, 23 °C ±3 °C, 95 % confidence level (k=2), normally distributed). Specification applies to 50 MHz, 223.61 mV, referenced to the end of the provided serialized 0.91 meter (3 ft) cable.
  • Page 26 5790B Service Manual 1-20...

  • Page 27: Theory Of Operation

    Product. • The FTS (Fluke RMS Thermal Sensor) is the transfer element. It compares a precisely known adjustable dc voltage (or a square wave derived from dc) to an unknown ac voltage. If the FTS output remains...

  • Page 28: Functional Block Diagram Discussion

    5790B Service Manual Functional Block Diagram Discussion Refer to part 1 of Figure 2-1, the functional block diagram. The ac signal to be measured is applied to the FTS first through attenuators (precision resistor networks switched in or out depending on range), the transfer switch, and precision amplifiers (again depending on range).
  • Page 29 Theory of Operation Functional Block Diagram Discussion MEASURE INPUT PROTECTION INTERRUPT BINDING POSTS TRANSFER ATTENUATORS SWITCH PROTECTION MODULE TYPE ‘N’ SENSOR CONNECTOR AMPLIFIERS CHOPPER MEASURE DAC PROTECTION INTERRUPT BINDING POSTS ATTENUATORS PROTECTION MODULE TYPE ‘N’ SENSOR CONNECTOR AMPLIFIERS CHOPPER 28 Hz FLOWCHART ADJUST MEASURE...

  • Page 30: Digital Section Overview

    5790B Service Manual Digital Section Overview The unguarded Digital Section contains the CPU assembly (A20), the Front Panel assembly (A2), Keyboard assembly (A1), and the Rear Panel I/O assembly (A21). Figure 2-2 is a block diagram of the digital section of the Product.
  • Page 31 Theory of Operation Analog Section Overview ics001.eps Figure 2-2. Digital Section Block Diagram...

  • Page 32: System Interconnect Detailed Circuit Description

    5790B Service Manual System Interconnect Detailed Circuit Description Digital Motherboard Assembly (A4) The digital motherboard contains the soft-power circuit, line fuse, a fiber-optic transmitter, and a fiber-optic receiver. It also contains connectors for the transformer assembly (A22), CPU assembly (A20), front panel assembly (A2), and the two 24 V dc fans mounted in the chassis.

  • Page 33: Digital Section Detailed Circuit Description

    Theory of Operation Digital Section Detailed Circuit Description Digital Section Detailed Circuit Description Detailed descriptions of each assembly in the digital section are provided next. CPU Assembly (A20) The CPU assembly uses a soft-core microprocessor contained within an FPGA (field-programmable gate array), running the μCLinux operating system. It controls local and remote interfaces and serial communications over a fiber-optic link to the crossing portion of the regulator/guard crossing assembly (A17).

  • Page 34: A/D Amplifier Assembly (A15)

    The A15 A/D amplifier board contains circuitry for generating the chopped dc reference for the A10 transfer assembly and circuitry for measuring the output of the Fluke thermal sensor circuit, also on the transfer assembly. The chopper circuit provides a symmetrical square wave equal in RMS value to the dc input voltage (0.7 V to 7 V).
  • Page 35 Theory of Operation Analog Section Detailed Circuit Description 2V DIVIDER OUTPUT DC REFERENCE FROM SELECT A16 DAC PRECISION INVERTER 28 Hz CHOPPER CHOPPER ATTENUATORS SWITCHES TRANSFER CHOPPER ASSEMBLY OSCILLATOR 28 Hz elu009.eps Figure 2-4. Chopper Circuit Block Diagram The null DAC is set by the CPU to equal the A/D measurement taken with the instrumentation amplifier on the X1 setting (the first pass).

  • Page 36: Dac Assembly (A16)

    5790B Service Manual DAC Assembly (A16) The DAC (digital-to-analog converter) provides a digitally adjustable precision dc voltage from 0 V to 11 V. The DAC uses a pulse-width-modulated scheme to vary its output. The block diagram of the DAC assembly is shown in Figure 2-6.

  • Page 37: Wideband Module (A6)

    Theory of Operation Analog Section Detailed Circuit Description 0.78 mV DC NEGATIVE OFFSET DUTY-CYCLE CONTROL CHAN. 2 13V DC REFERENCE 5-POLE FILTER A16A1 OUTPUT CHAN. 1 STAGE 13V DC DUTY-CYCLE CONTROL SHUNT SENSE LINEARITY LINEARITY CURRENT CONTROL CONTROL CANCELLATION elu011.eps Figure 2-6.
  • Page 38 5790B Service Manual elu012.eps Figure 2-7. A6 Wideband Assembly Block Diagram 2-12...

  • Page 39: Calibration Adjustment And Verification

    (90 Day, 1 Year, or 2 Year) in the setup menu by selecting Setup Menu>Instrument setup>Calibration Interval from the front panel, or use the remote commands as described in Chapters 5 and 6 of the 5790B Operators Manual. Calibration Reports Calibration Reports show the shifts at various input levels and frequencies that are the result of the most recent, or the previous calibration.

  • Page 40: Save Calibration Reports

    The passcode can also be changed over the remote interface with the CAL_PASSWD command. If the passcode for a particular Product is lost, contact Fluke Customer Support. See How to Contact Fluke Calibration.

  • Page 41: Automating Calibration Adjustment And Verification

    User document the remote interfaces and commands that can help you with the calibration. Note A technical paper describes the system in use at Fluke Calibration to calibrate and verify the 5790A: Calibration and Traceability of a Fully Automatic AC Measurement Standard, by David Deaver, presented in the NCSL Workshop and Symposium, 1991.

  • Page 42: Calibration

    5790B Service Manual AFTER CALIBRATION BUT BEFORE STORING: ACTIVE STORED (VOLATILE) (NONVOLATILE) (NONVOLATILE) STORE OPERATION: DISCARD ACTIVE STORED (VOLATILE) (NONVOLATILE) (NONVOLATILE) AT EACH POWER-UP: ACTIVE COPY STORED (NONVOLATILE) (VOLATILE) (NONVOLATILE) elu013.eps Figure 3-1. Calibration Memory Organization Calibration The subsequent information describes how to calibrate the Product to external standards.

  • Page 43: Characterizing The Dc Source

    Self-Calibrate a Fluke 752A Divider with a Fluke 8508A as the Null Detector 1. Connect the 5730A, 752A, and 8508A as shown in Figure 3-3. 2. Set the 8508A to the 200 mV dc voltage range at 7 digits. The filter is “ON”...
  • Page 44 0.5 μ V. 5. Using a DMM takes longer and more care is necessary to self- calibrate a 752A than using a Fluke 845, but it can still be done in a reasonable time once you get used to the new technique.

  • Page 45: Dc Voltage Source Characterization Values

    DC Voltage Source Characterization Values 1. Self-Calibrate the reference divider according to the procedure in the Self- Calibrate a Fluke 752A Divider with a Fluke 8508A as the Null Detector section above. 2. Connect the reference divider and the 8508A as shown in Figure 3-3. The short on the INPUT and REFERENCE STANDARD inputs of the reference divider must be a low thermal EMF connection.
  • Page 46 5790B Service Manual 8508A Reference Multimeter External External Sense Guard 5730A Calibrator 752A Voltage Divider Standard 732B Voltage INPUT Reference Standard NULL DETECTOR GND GRD OUTPUT REFERENCE STANDARD 732B DC STANDARD AC PWR IN CAL CHARGE LOW BAT 1.018V CHASSIS 10V COM 1.018V COM...
  • Page 47 Calibration Adjustment and Verification Calibration 8508A Reference Multimeter External External Sense Guard 5730A Calibrator 5730-7003 5730-7003 752A Voltage Divider Standard 732B Voltage Reference Standard INPUT NULL DETECTOR GND GRD OUTPUT REFERENCE STANDARD 732B DC STANDARD AC PWR IN CAL CHARGE LOW BAT 1.018V CHASSIS...
  • Page 48 ) *DividerSetting * 0.1 The formula is used to calculate the output voltage of the Product equivalent to characterized nominal output relative to a reference cell (Fluke 732B or 732A) and a reference divider (Fluke 752A). Polarity is “+1” for positive and “-1” for negative.
  • Page 49 Calibration Adjustment and Verification Calibration Table 3-2. DC Characterization Test Record Character- Character- DMM Final 10 V Std. Divider 5730A Error Display Indication to obtain ization ization Null Polarity Setting Characterized Nominal Output (μV/V) Range Level (±μV) 220 mV +100 mV 2.2 V +100 mV 220 mV...

  • Page 50: Dc Calibration Adjustment

    Pomona Model 1796 or Equivalent Low-Thermal Test Leads Fluke 5440B-7002 or equivalent (two sets) *: The 5730A must be characterized for dc using the procedure in this section. 1. Set up the equipment as shown in Figure 3-5. A shielded twisted pair is recommended for the 5730A SENSE leads.
  • Page 51 Calibration Adjustment and Verification Calibration 5790B EXT GRD Input 1 Type "N" to Dual Binding Post Adatper SENSE HI GUARD Coaxial Tee SENSE LO 50 Ω Coaxial Cable 12/21/12 10:52am +/- 0.00050mV (1 year) 213 days since calibration Standby Auto Range 220 mV 0.00000...
  • Page 52 5790B Service Manual 2. Turn on the Product and 5730A/5725A and allow a 30-minute warmup time. 3. Set the 5730A to EXT SENSE. Verify that the shorting strap is connected between GUARD and GROUND. Set the Product to EXT GUARD.
  • Page 53 Calibration Adjustment and Verification Calibration Table 3-4. Calibration Steps in Calibration Adjustment Uncertainty of the Voltage to Step Name characterized Purpose of Calibration Step Apply Source (µV/V) Basic dc +2 V dc Calibrates DACs and thermal sensor. (This is the unscaled range) Sensor turnover −2.0 -2 V dc Corrects dc turnover error...
  • Page 54 5790B Service Manual Step Name Voltage to Apply Purpose of Calibration Step LF (10 Hz) Linearity 2 V RMS, 10 Hz Generates a correction for thermal sensor non-linearity at LF (10 Hz) Linearity 600 mV RMS, 10 Hz low F and f 2.2 mV AC 10 Hz...
  • Page 55 Calibration Adjustment and Verification Calibration Step Name Voltage to Apply Purpose of Calibration Step 220 mV AC 10 kHz 200 mV RMS, 10 kHz 220 mV AC 20 kHz 200 mV RMS, 20 kHz 220 mV AC 50 kHz 200 mV RMS, 50 kHz 220 mV AC 100 kHz 200 mV RMS, 100 kHz 220 mV AC 300 kHz...

  • Page 56: Ac Calibration Adjustment

    Those are worksheets to help you calibrate the various ac points. Table 3-5. Equipment Required for Main Input AC Calibration Required Equipment Manufacturer and Model Minimum use Requirements Fluke Calibration 792A, with AC-DC Transfer Standard 60 mV to 1000 Vrms, 10 Hz to 1 MHz accessories Multifunction Calibrator...
  • Page 57 Calibration Adjustment and Verification Calibration VOLTAGE (NOMINAL ) FRE QUENC Y 792A CORRECTION (PPM) 792A 5790B DC AVER AG E DC 792 = DC 5790 = AC 792 AC MEAS I+DCI + I-DCI DC AVER AG E AC 792 792 CORR...
  • Page 58 5790B Service Manual VOLTAGE (NOMINAL) FREQUENCY 5700A ERROR DISPLAY FROM TABLE 3-2, POSITIVE 5700A ERROR DISPLAY FROM TABLE 3-2, NEGATIVE 792A CORRECTION (PPM) 792A DMM READING DC 792 AC 792 AC MEAS = I+DCI + I-DCI DC 792 AC 792...
  • Page 59 Coaxial Tee Only CHARGE LOW B AT OPER AT E 792A P OWER PAC K (No cable between 5790B UUT 792A and 5790B) EX GUARD Input 1 P OWER SUPP LY OUTPUT 1000 V Range Resistor Use above 220 V only...
  • Page 60 Menu>Calibration>Adjust AC All Main. The display changes to indicate the first AC Step: LF (10 Hz) Linearity. 4. For all the ac cal points down to the 70 mV range, use the Fluke Calibration 792A AC/DC Transfer Standard to adjust the ac voltage level being applied to the 5790B INPUT1 connector.
  • Page 61 Again, allow the DMM reading to stabilize. Record the DMM reading under the 792A column in the worksheet for -DC. Record the reading on the Product Output Display under the 5790B column for -DC. Ignore polarity for the Product reading (record the absolute value).
  • Page 62 6 V to 0.2 V. It is not required to know the divider division ratio. Connect the Fluke 5730A, Fluke 792A, and the DUT as shown in Figure 3-10. Measure the linearity error of each range at 1 kHz only.
  • Page 63 RANGE 0.6 mV elu033.eps Figure 3-9. Millivolt Range Bootstrapping Technique 100:1 Resistive 5790B Divider 792A elu072.eps Figure 3-10. mV Range Linearity Setup for Bootstrap Ranges a. Calibrate the 22 mV range as follows: 1) Lock the Product in the 70 mV range. The 792A may be left attached, although it is not used.
  • Page 64 5790B Service Manual 5) When the step is completed, set the 5730A to standby. 6) Repeat the previous steps 1 through 5 for the other 22 mV range point(s). b. Calibrate the 7 mV range as follows: 1) Lock the Product in the 22 mV range. The 792A may be left attached, although it is not used.

  • Page 65: Calibrate The Wideband Ac Option

    Adapter, Type “N” (F) to Facilitate connection to DMM for 1 kHz Pomona 1740 or equivalent Double Banana Plug Wideband Gain verification Frequency counter Tektronix FCA3000 5ppm Frequency Uncertainty or Better [1] The JFW attenuators must be calibrated by Fluke Calibration (see text). 3-27...

  • Page 66: 200 Hz

    5790B Service Manual Table 3-7. Wideband Calibration Worksheet _______Range 1 kHz EL1100 5790B 5730A 10 dB 20 dB 20 dB 20 dB Total Frequency Corr. Error Error Error Error Error Error Error Error (PPM) (PPM) (PPM) (PPM) (PPM) (PPM) (PPM)

  • Page 67: Characterizing The Ac Source

    WIDEBAND flatness calibration. Note Fluke Calibration offers a calibration service for Precision Measurement EL1100 and JFW attenuators at the Fluke Primary Laboratory. For price and delivery of this calibration service, please see How to Contact Fluke Calibration. 1. Connect the equipment as shown in Figure 3-10.
  • Page 68 DMM and TVC. Connect the 5730A wideband cable to the the 50 Ω input impedance ac voltmeter in Figure 3-2. In this setup, the 50 Ω input impedance consists of calibrated Fluke 5790B with a precision 50 Ω resistive load , where the load is made of carbon film resistors and trimmed to within 50 Ω...
  • Page 69 Calibration Adjustment and Verification Calibration Table 3-8. Wideband Calibration Source Characterization Amplutude Frequency Fluke 5790B Measured 3.5 V 1 kHz 3.2 V 1 kHz 1 kHz 1 kHz 0.64 V 1 kHz 0.6 V 1 kHz 0.32 V 1 kHz 0.2 V...

  • Page 70: Calibration Adjustment Of Wideband Input Gain At 1 Khz

    Calibration Adjustment of Wideband Input Gain at 1 kHz Proceed as follows to perform gain (absolute) calibration adjustment at 1 kHz for each range. 1. Connect the 5730A Wideband output to the 5790B Wideband input with the same cable used during characterization. 2. Select Wide Band Input.

  • Page 71: Calibration Adjustment Of Wideband Input Flatness

    Before you start, make 8 copies of Table 3-7 with the 5730A error column filled in (Recorded entries into the 5730A error column during in the first part of WIDEBAND calibration.) 1. Connect the equipment as shown in Figure 3-13. 5790B 5730A Calibrator ATTE N WIDEBAND...
  • Page 72 Service Manual Table 3-9 shows the combination of the attenuators required to scale the input signal properly for each range. Table 3-9. Attenuators Required for Each Range Range Attenuators 5790B Input None 3.2 V 2.2 V (1) 10 dB 700 mV...

  • Page 73: Calibration Adjustment Of Af Option

    The following procedure is a part of calibration adjustment only if the 5790B/AF Option is installed in your Product. 5790B with an AF Option are supplied with a dedicated cable for this option. The calibration of the Product is only valid when the provided cable is used.
  • Page 74 5790B Service Manual Table 3-10. Required Equipment for Calibration Adjustment of the AF Option. Required Equipment Manufacture and Model Minimum use Requirements 0.1 % short term stability. SWR Power meter with REF OUT better than 1.05 Power Meter Tegam 1830A...

  • Page 75: Calibration Verification

    The equipment listed in Table 3-11 is required for the calibration of the dc voltage function. The Fluke 5730A provides for reasonable test uncertainty ratio, especially if it is calibrated to its 90 day specification limits and within the 90 day calibration interval.
  • Page 76 1048.9612 V 1049.0388 V *The average of the absolute measurement of the Product with normal and reversed polarity stimulus applied. 5790B Average = (Meas1 + |Meas2|)/2 1. Connect the 5730A Output HI/LO to the Product Input 2 HI/LO using the low thermal leads.

  • Page 77: Verifying The Main Input (Input 1 Or 2)

    Verifying the Main Input (INPUT 1 or 2) Verifying the Main Input requires measurements and calculations that result in over 400 entries in a test record. At Fluke Calibration, an automated procedure is used as described in the introduction to this section. Test voltages and frequencies are divided into five regions as defined in Table 3-13.
  • Page 78 5790B Service Manual Table 3-14. Test Record for Main Input Verification 0.0022 0.002 10 Hz 2350 2350 No spec 0.0022 0.002 20 Hz 1390 1390 No spec 0.0022 0.002 40 Hz 1070 1070 No spec 0.0022 0.002 1 kHz 1070...
  • Page 79 Calibration Adjustment and Verification Calibration Verification 0.07 0.06 10 Hz No spec 0.07 0.06 20 Hz No spec 0.07 0.06 40 Hz No spec 0.07 0.06 1 kHz No spec 0.07 0.06 20 kHz No spec 0.07 0.06 50 kHz No spec 0.07 0.06...
  • Page 80 5790B Service Manual 10 Hz 20 Hz 40 Hz 1 kHz 20 kHz 50 kHz 100 kHz No spec 300 kHz No spec 500 kHz No spec 1 MHz No spec 10 Hz 20 Hz 40 Hz 1 kHz 20 kHz...
  • Page 81 Calibration Adjustment and Verification Calibration Verification 40 Hz 1 kHz 20 kHz 50 kHz 100 kHz No spec 300 kHz No spec 500 kHz No spec 1 MHz 1100 1200 No spec 20.0 10 Hz 20.0 20 Hz 20.0 40 Hz 20.0 1 kHz 20.0...
  • Page 82 5790B Service Manual 200.0 1 kHz 200.0 20 kHz 200.0 50 kHz 200.0 100 kHz No spec 600.0 40 Hz 600.0 1 kHz 600.0 20 kHz 600.0 50 kHz No spec 600.0 100 kHz No spec 1000 1000.0 100 Hz 1000 1000.0...

  • Page 83: Verifying Ac-Dc Difference For Regions I And Iii (220 Mv Through 1000 V Range)

    Calibration Adjustment and Verification Calibration Verification Verifying AC-DC Difference for Regions I and III (220 mV through 1000 V Range) Calculate the ac-dc difference error by comparing the ac-dc difference of the source as measured by the Product and the 792A. To do this, use the instrument setup and technique as described under “AC Calibration”.
  • Page 84 5790B Service Manual VOLTAGE (NOMINAL ) FREQUENCY 5730A ERROR DISPLAY FROM TABLE 3-2, POSITIVE ERROR DISPLAY FROM TABLE 3-2, NEGATIV E 792A CORRECTION (PPM) 792A 5790B DC AVERAGE DC 792 = DC 5790 = AC 792 = AC 5790 =...
  • Page 85 Calibration Adjustment and Verification Calibration Verification VOLTAGE (NOMINAL) FREQUENCY 792A CORRECTION (PPM) 792A 5790B DC AVERAGE DC 792 = DC 5790 = AC 792 = AC 5790 = AC-DC ERROR = I+DCI + I-DCI DC AVERAGE DC 5790 - AC 5790...
  • Page 86 5790B Service Manual VOLTAGE (NOMINAL) FREQUENCY ERROR DISPLAY FROM TABLE 3-2, POSITIVE ERROR DISPLAY FROM TABLE 3-2, NEGATIVE 792A CORRECTION (PPM) 5790B 792A DC AVERAGE DC 792 = AC 792 = AC 5790 = AC ERROR = I+DCI + I-DCI...

  • Page 87: Verifying Absolute Ac Error For Region Ii (2.2 V Through 1000 V Range)

    Calibration Adjustment and Verification Calibration Verification Verifying Absolute AC Error for Region II (2.2 V through 1000 V Range) Because of the loading of 792A in its 700 mV to 1000 V ranges, the dc voltage at the reference point of the calibration (center of the tee) is not the same as the dc voltage at the output terminals of the source unless sense terminals are provided for the source to the tee.
  • Page 88 5790B Service Manual VOLTAGE (NOMINAL) ERROR DISPLAY FROM TABLE 3-2, POSITIVE ERROR DISPLAY FROM TABLE 3-2, NEGATIVE 5790B READING DC 5790 = DC ERROR = I+DCI + I-DCI DC 5790 DC 5790 - DC NOMINAL DC ERROR (PPM) DC NOMINAL elu046.eps...

  • Page 89: Verifying Absolute Ac Error For Region V (2.2 Mv Through 22 Mv)

    DUT_Ver_R_FullScale_Err Where linearity of the upper range is based on measurements with 100:1 resistive divider relative to Fluke 792A. Components are all in µV/V relative to Fluke 792A and use of 100:1 resistive divider during both steps. If Wideband option is not present, proceed to the Update Full Verification Date section.

  • Page 90: Verifying The Wideband Ac Option

    Verifying the Wideband AC Option Wideband verification verifies that the 5790B WIDEBAND input (requires Option 5790B/3, 5790B/5, or 5790B/AF) is within tolerance. There are two worksheets and one test record to facilitate this procedure. You will need 1 copy of Table 3- 15, 8 copies of Table 3-16 (one for each voltage range) and 1 copy of the overall test record, Table 3-17.
  • Page 91 Calibration Adjustment and Verification Calibration Verification Table 3-16. Wideband Flatness Verification Worksheet ___________Range 10 Hz 20 Hz 50 Hz 105 Hz 200 Hz 2 kHz 10 kHz 20 kHz 50 kHz 120 kHz 200 kHz 500 kHz 700 kHz 1 MHz 1.2 MHz 2 MHz 3 MHz...
  • Page 92 5790B Service Manual Table 3-17. Wideband Verification Test Record 3.2 V 10 Hz 0.10 0.31 3.2 V 20 Hz 0.10 0.31 3.2 V 50 Hz 0.03 0.31 3.2 V 105 Hz 0.03 0.31 3.2 V 200 Hz 0.03 0.31 3.2 V 2 kHz 0.03...
  • Page 93 Calibration Adjustment and Verification Calibration Verification 3.2 V 35 MHz 0.35 No Spec No Spec 3.2 V 40 MHz 0.35 No Spec No Spec 3.2 V 45 MHz 0.35 No Spec No Spec 3.2 V 50 MHz 0.35 No Spec No Spec 2.2 V 1.0 V...

  • Page 94: 200 Hz

    5790B Service Manual 2.2 V 1.0 V 28 MHz 0.35 No Spec No Spec 2.2 V 1.0 V 30 MHz 0.35 No Spec No Spec 2.2 V 1.0 V 35 MHz 0.35 No Spec No Spec 2.2 V 1.0 V 40 MHz 0.35...

  • Page 95: 200 Hz

    Calibration Adjustment and Verification Calibration Verification 700 mV 320 mV 23 MHz 0.35 No Spec No Spec 700 mV 320 mV 26 MHz 0.35 No Spec No Spec 700 mV 320 mV 28 MHz 0.35 No Spec No Spec 700 mV 320 mV 30 MHz 0.35...
  • Page 96 5790B Service Manual 220 mV 100 mV 17 MHz 0.15 No Spec No Spec 220 mV 100 mV 20 MHz 0.15 No Spec No Spec 220 mV 100 mV 23 MHz 0.35 No Spec No Spec 220 mV 100 mV 26 MHz 0.35...
  • Page 97 Calibration Adjustment and Verification Calibration Verification 70 mV 32 mV 15 MHz 0.15 No Spec No Spec 70 mV 32 mV 17 MHz 0.15 No Spec No Spec 70 mV 32 mV 20 MHz 0.15 No Spec No Spec 70 mV 32 mV 23 MHz 0.35...
  • Page 98 5790B Service Manual 22 mV 10 mV 10 MHz 0.10 No Spec No Spec 22 mV 10 mV 12 MHz 0.17 No Spec No Spec 22 mV 10 mV 15 MHz 0.17 No Spec No Spec 22 mV 10 mV 17 MHz 0.17...
  • Page 99 Calibration Adjustment and Verification Calibration Verification 7 mV 3.2 mV 8 MHz 0.13 No Spec No Spec 7 mV 3.2 mV 9 MHz 0.13 No Spec No Spec 7 mV 3.2 mV 10 MHz 0.13 No Spec No Spec 7 mV 3.2 mV 12 MHz 0.20...
  • Page 100 5790B Service Manual 2.2 mV 1 mV 4 MHz 0.26 No Spec No Spec 2.2 mV 1 mV 6 MHz 0.26 No Spec No Spec 2.2 mV 1 mV 8 MHz 0.26 No Spec No Spec 2.2 mV 1 mV 9 MHz 0.26...

  • Page 101: Wideband 1-Khz Gain Verification

    4. Read the measurement on the Product display and record in the "Measured by 5790B" column in Table 3-15. Record the 5730A actual output from Table 3-8. Calculate the error (%) in the "5790B Error" column in Table 3-15. Populate the Lower and Upper Limit columns with the appropriate limits based on the Specification Interval (user selectable).

  • Page 102: Verification Of Af Option

    17. Verify all other ranges in the same way. Verification of AF Option The following procedure is a part of calibration only if the 5790B/AF Option is installed in your Product. 5790B with an AF Option are supplied with a dedicated cable for this option.

  • Page 103: Update Full Verification Date

    0.46 Record the characterized source value in the "Characterized Source Output" column. Record the Product measurement in mW in the "5790B Measured" column. Calculate the Product Error in mW and in % to evaluate against specifications. Update Full Verification Date Once the calibrations of dc, ac, and Wideband (if present) are complete, the full verification date may be manually updated.
  • Page 104 5790B Service Manual 3-66...

  • Page 105: Maintenance

    Chapter 4 Maintenance Introduction Because this is a high-performance instrument, Fluke Calibration does not recommend that the Product be repaired to the component level. It is easy to introduce a subtle long-term stability problem by handling the circuit boards. Access procedures are provided for those who want to replace a faulty module only.

  • Page 106: Fuse Replacement

    5790B Service Manual elu049.eps Figure 4-1. Accessing the Air Filter Fuse Replacement Access the fuse from the rear panel. The fuse rating label below the fuse holder shows the correct replacement fuse ratings for each operating voltage. Warning To prevent possible electrical shock, fire, or personal injury: •...
  • Page 107 Maintenance Introduction Table 4-1. Replacement Fuses Line Voltage Setting Fuse Description Fluke Part Number  100 V to 120 V T 1.5 A 250 V(SB) 109231  220 V to 240 V T 1.5 A 250 V(SB) 109231 hhp003.eps Figure 4-2. Access the Fuse...

  • Page 108: Clean The Air Filter

    5790B Service Manual Clean the Air Filter Caution Damage caused by overheating can occur if the area around the fan is restricted, the intake air is too warm, or the air filter becomes clogged. To prevent Product damage, make sure that the filter is completely dry before reinstallation.
  • Page 109 Maintenance Introduction hvi026.eps Figure 4-3. Air Filter Access...

  • Page 110: Access Procedures

    5790B Service Manual Access Procedures Top and Bottom Covers Check that power is not connected to Product; the power control must be off, and the line power cord must be disconnected. Top and bottom covers are secured with eight Phillips head screws (four front, four rear).

  • Page 111: Front Panel Removal And Installation

    Maintenance Access Procedures Front Panel Removal and Installation To remove the front panel: 1. Remove the top and bottom covers. 2. Remove the two screws at the top of the front panel and the six hex screws on the front handles and gently pull the front panel away from the mainframe. Position the front panel on its handles in front of the instrument.

  • Page 112: A20 Cpu Assembly Removal And Installation

    5790B Service Manual A20 CPU Assembly Removal and Installation Once the Product and digital section top covers have been removed, remove the CPU by pulling straight up at the top corners of the assembly. In relation to the chassis side, the CPU assembly components face toward, and the digital power supply assembly components face away.

  • Page 113: Error Codes

    Maintenance Error Codes Error Codes The Product error codes are listed below. 0-Level Faults: Error handling No Error Error Queue Overflow Bad ERR Channel 100-Level Faults: Self-calibration Invalid Procedure Number No Such Step In Procedure No Cal/Diag Procedure Underway Cal/Diag not Halted No Cal Step To Which To Back Up No Such Position For Range Under Cal No Such Range For Cal Procedure...
  • Page 114 5790B Service Manual INPUT2 Correction Factor Out Of Limits Calibration Step In Progress Must Do Wideband Reference Correction First Cable Calibration Failed Calibration Procedure Complete Cal Error Occurred; Already Reported 200-Level Faults: Hardware configuration Need A %s To Do That...
  • Page 115 Maintenance Error Codes A6 Wideband: %s Range A6 Wideband: Overload Check A6 Wideband: %s Frequency Measurement A3 Motherboard: KV Divider %s A10 Transfer: Sensor Loop Settling A6 Wideband: Sensor Loop Settling A16 DAC: DAC Settling A6 Wideband: Dormant Protection Check A15 A/D: %s Linearity Diagnostics Procedure Complete 500-Level Faults: Instrument state...
  • Page 116 5790B Service Manual Source filename on USB device not specified in AuxInfo Can not build a list of sequences to be executed Backup directory not specified in AuxInfo (config/cal) Backup file not specified in AuxInfo (config/cal) Destination directory not specified in AuxInfo (config/cal)
  • Page 117 Maintenance Error Codes Unable to extract command2 from AuxInfo for FrontPanel_Part3 Error creating interim directory MD5 hash of downloaded file does not agree with AuxInfo Error mounting USB device File to be downloaded does not exist on USB device USB device not plugged in Error deleting previous backup file Error renaming installed file to backup Error moving download file to destination directory...
  • Page 118 5790B Service Manual 800-Level Faults: Calibration constant Bad Cal Constant ID Bad Cal Group ID Save Operation Failed Save Operation Complete 900-Level Faults: Normal measurement A/D Measurement Failed Protection Activated Inguard is overloaded Ground Protection Activated -- Press Reset DC Zero Cal Needed -- Go to Calibration in Setup Menu...
  • Page 119 Maintenance Error Codes 1210 GPIB I/O operation aborted (time-out) 1211 GPIB non-existent GPIB board 1212 GPIB routine not allowed during asynchronous I/O operation 1213 GPIB no capability for operation 1214 GPIB File system error 1215 GPIB command byte transfer error 1216 GPIB serial poll status byte lost 1217...
  • Page 120 5790B Service Manual 1360 Bad Binary Number 1361 Bad Binary Block 1362 Bad Character 1363 Bad Decimal Number 1364 Exponent magnitude too large 1365 Bad Hexadecimal Block 1366 Bad Hexadecimal Number 1368 Bad Octal Number 1369 Too Many Characters 1370...
  • Page 121 Maintenance Error Codes 1605 Inguard CPU Timed Out On Main CPU 1606 Inguard CPU Command Error 1607 Timed Out Waiting For Inguard Reply 1608 Sequence Name Too Long 1609 Element Array Full 1610 Name Array Full 1611 Already Defining A Sequence 1612 Not Defining A Sequence 1613...
  • Page 122 5790B Service Manual 1900-Level Faults: System 1901 Can not modify file property 1902 Update execution error 2000-Level Faults: USB host 2000 Failed to mount USB drive 2001 Failed to copy files 2100-Level Faults: Self-test 2200-Level Faults: Utilities 2203 Cannot Set String. Cal Is Secured...

  • Page 123: List Of Replacable Parts

    List of Replacable Parts Introduction This chapter contains an illustrated list of replacement parts for the 5790B. Parts are list by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator.
  • Page 124 5790B-2008,FRONT PANEL PLASTIC 4411030 5790B-8002,INPUT DECAL, 5790B 4411009 5790B-2009,LED SPACER 4413773 5790B-8001,KEYPAD, 5790B 4410993 5730A-2703,DISPLAY ASSEMBLY 4304647 5790B-8003,MODEL DECAL, 5790B 4411011 5730A-8003,DECAL, USB 4219557 5790B-2501,SHEET METAL KIT, 5790B (See Kit Parts list) 4410979 5790B-4402,WIRE, INPUT 1 4414966 5790B-4403,ASSEMBLY, GROUND STRAP 4414982...
  • Page 125 SCREW,4- 40,.375,FLAT,PHILLIPS,STAINLESS,PASSIVATE,LOCK 256024 (MUST BE ROHS COMPLIANT) 5440A-8198-01,BINDING POST, STUD, PLATED 102707 WASHER,WASHER,LOCK,INTRNL,STL,.267ID 110817 NUT,NUT,HEX,BR,1/4-28 110619 5440A-8197-01,BINDING HEAD, PLATED 102889 5790B-2502,FAN & CONNECTOR ASSY 4586950 5700A-8021,FILTER, AIR 813493 5730A-2015,SIDE EXTRUSION 4222803 5730A-2016,INSERT EXTRUSION 4233853 6070A-2063,AIDE,PCB PULL 541730 WASHER,WASHER,FLAT,SS,.119,.187,.010 853296 WASHER,WASHER,FLAT,STL,.160,.281,.010...
  • Page 126 159756 CLEAR,LOCK 5730A-4401,INLET HARNESS 4308875 5730A-4402,INLET WIRE 4308882 5730A-4403,INLET WIRE 4308894 5730A-4404,GROUND WIRE 4308907 5730A-4405,GROUND WIRE 4308918 SCREW,4-14,.375,PAN,PHILLIPS,STEEL,ZINC-ROHS 448456 CLEAR,THREAD FORM FUSE,FUSE,.25X1.25,1.5A,250V,SLOW 109231 SPACER,SPACER,.250 RND,AL,.156ID,.250 153155 SCREW,4-40,.625,PAN,PHILLIPS,STEEL,ZINC- 145813 CLEAR,LOCK BUMPER,HI-TEMP SILICONE,.44 DIA,.188 1601870 THK,ADHESIVE 5790B-2012,LIGHT RING 4589532 5790B-2006,NUT PLATE 4421642...
  • Page 127 Table 5-2. Sheet Metal Kit Part Description Number 5730A-2004,TOP COVER 4104376 5730A-2005,BOTTOM COVER 4104383 5790B-2013,FRAME, FILTER 4604458 5700A-2009,INSULATOR,DIGITAL MOTHERBOARD 761247 5790B-2004,FRONT PANEL SHEET METAL 4410954 5730A-2019, LCD MOUNT 4303920 5790B-2003,ANALOG TOP COVER 4410946 5700A-2013,INSULATOR, ANALOG BOTTOM 775361 5730A-2007,DIGITAL COVER 4104408 5790B-2701,RIVETED CHASSIS ASSY. 4413141...
  • Page 128 5790B Service Manual 5790B Final Assembly (1 of 4) 5790b_fa_1.eps Figure 5-1. Final Assembly...
  • Page 129 List of Replacable Parts How to Obtain Parts 5790B Final Assembly (2 of 4) 5790b_fa_2.eps Figure 5-1. Final Assembly (Cont)
  • Page 130 5790B Service Manual 5790B Final Assembly (3 of 4) 5790b_fa_3.eps Figure 5-1. Final Assembly (Cont)
  • Page 131 List of Replacable Parts How to Obtain Parts 5790B Final Assembly (4 of 4) 5790b_fa_4.eps Figure 5-1. Final Assembly (Cont)
  • Page 132 5790B Service Manual 5-10...

  • Page 133: Appendices

    Appendices Appendix Title Page Glossary of AC-DC Transfer Related Terms ........... A-1 ASCII and IEEE – 488 Bus Codes ............B-1 Calibration Constant Information ............. C-1...
  • Page 134 5790B Service Manual...
  • Page 135 A stable object that produces or embodies a physical quantity for use as a reference standard. An artifact standard may have an assigned traceable value when used for calibration purposes. Fluke 732A DC Voltage Reference Standard and the Fluke 742A Series Standard Resistors are examples. Also see “transfer standard”. AC-DC Absolute Uncertainty Includes all known error sources contributing to the uncertainty of an AC-DC difference correction.
  • Page 136 5790B Service Manual AC-DC Transfer The process of comparing an AC voltage to a known DC voltage, thereby transferring the low uncertainty of the DC voltage to the AC voltage. The 792A can be used to perform two different types of AC-DC transfers: 1.
  • Page 137 Appendices Glossary of AC-DC Transfer Related Terms Calibration Report A record of shifts or calibration constant changes that have occurred during calibration. Calibrator A device that supplies outputs with a known uncertainty for use in testing the accuracy of measurement devices or other sources. Characterization A calibration process that produces a calibration constant or known error for use in correcting the output or reading of an instrument or standard.
  • Page 138 5790B Service Manual Error Deviation from correct value. The different types of error defined in this glossary are floor, gain, offset, linearity, random, scale, systematic, transfer, and zero. Flatness A measure of output level variation for a voltage source as frequency is varied.
  • Page 139 Appendices Glossary of AC-DC Transfer Related Terms Life-Cycle Cost The consideration of all elements contributing to the cost of an instrument throughout its useful life. This includes initial purchase cost, service and maintenance cost, and the cost of support equipment. Linearity The relationship between two quantities when a change in the first quantity is directly proportional to a change in the second quantity.
  • Page 140 5790B Service Manual Normal Mode Noise An undesired signal that appears between the terminals of a device. Offset Error Same as zero error. The reading shown on a meter when an input value of zero is applied is its offset or zero error.
  • Page 141 Appendices Glossary of AC-DC Transfer Related Terms Reliability A measure of the probability of failure of an instrument. Repeatability See “precision”. Resistance A property of a conductor that determines the amount of current that will flow when a given amount of voltage exists across the conductor. Resistance is measured in ohms.
  • Page 142 5790B Service Manual Sensitivity The degree of response of a measuring device to the change in input quantity, or a figure of merit that expresses the ability of a measurement system or device to respond to an input quantity. Settling Time The time taken for a measurement device's reading to stabilize after a voltage is applied to the input.
  • Page 143 The range of values, usually centered on the indicated or requested value, within which the true, accepted, or consensus value is expected to lie within stated probability or confidence. Fluke uses 99.7 % (3σ) confidence limits. Uncertainty is a quantification of accuracy.
  • Page 144 5790B Service Manual UUT (Unit Under Test) An abbreviated name for an instrument that is being tested or calibrated. Volt The unit of emf (electromotive force) or electrical potential in the SI system of units. One volt is the difference of electrical potential between two points on a conductor carrying one ampere of current, when the power being dissipated between these two points is equal to one watt.
  • Page 145 Appendix B ASCII and IEEE – 488 Bus Codes Binary ASCII Decimal Octal Dev. No. Message ATN = True Char. 7654 3210 0000 0000 0000 0001 0000 0010 0000 0011 0000 0100 0000 0101 0000 0110 BELL 0000 0111 0000 1000 0000 1001 0000 1010 0000 1011...
  • Page 146 5790B Service Manual Binary ASCII Dev. Decimal Octal Message ATN = True Char. 7654 3210 0001 0000 0001 0001 0001 0010 0001 0011 0001 0100 0001 0101 0001 0110 0001 0111 0001 1000 0001 1001 0001 1010 0001 1011 0001 1100...
  • Page 147 Appendices ASCII and IEEE – 488 Bus Codes Binary ASCII Dev. Decimal Octal Message ATN = True Char. 7654 3210 0011 0000 0011 0001 0011 0010 0011 0011 0011 0100 0011 0101 0011 0110 0011 0111 0011 1000 0011 1001 0011 1010 0011 1011 <...
  • Page 148 5790B Service Manual Binary ASCII Dev. Decimal Octal Message ATN = True Char. 7654 3210 0101 0000 0101 0001 0101 0010 0101 0011 0101 0100 0101 0101 0101 0110 0101 0111 0101 1000 0101 1001 0101 1010 0101 1011 0101 1100...
  • Page 149 Appendices ASCII and IEEE – 488 Bus Codes Binary ASCII Dev. Decimal Octal Message ATN = True Char. 7654 3210 0111 0000 0111 0001 0111 0010 0111 0011 0111 0100 0111 0101 0111 0110 0111 0111 0111 1000 0111 1001 0111 1010 0111 1011 0111 1100...
  • Page 150 5790B Service Manual...
  • Page 151 Appendix C Calibration Constant Information The constants in these tables are arranged by group. Each group is stored as a block in nonvolatile memory. The value given for each constant in this list is the default assigned before the instrument is first calibrated. Defaults are reinstated if you perform a format of the EEPROM ALL or CAL areas.
  • Page 152 5790B Service Manual Group FREQ Name Default Function FREQ_G Frequency counter "gain" (crystal error) Group DC_DAC Name Default Function DAC_G 3017.0 DAC gain Group WDC_SENSOR Name Default Function SENSOR_C1_WB 3.162277660e-03 (Autogenerated) SENSOR_C2_WB (Autogenerated) Group AC_LINEARITY Name Default Function LN_C Coefficient of V^VEX*F^FEX...
  • Page 153 Appendices Calibration Constant Information Group FACTORY Name Default Function WB_OHMS 50.0 True value of wideband input impedance SHUNT_G Correction for shunt measurements Freq (flatness) correction for SHUNT (vs SHUNT_A1 3.153719E-9 INPUT1), 1st order SHUNT_A2 3.072481E-14 Freq correction for SHUNT, 2nd 2nd order freq corr for INPUT2 (vs INPUT1), INPUT2_LO 150.0E-6...
  • Page 154 5790B Service Manual Group PERMANENT Name Default Function SLO_LIM 38.5 Slow/fast bit threshold Multiplies suggested ref value for lowest AC_LFCAL frequency Frequency at which DI and IA are calibrated WBDC_FREQ 1000.0 for wideband Point below which we switch back to low HF_LIMLO 102.0E+3...
  • Page 155 Appendices Calibration Constant Information Group WBCABLE Name Default Function The one and only correction for the cable, at WBCABLE_CORR 50 MHz Group DC_2_2MV Name Default Function DI_2_2MV 5000.0 2_2MV range DAC volts per input volt OF_2_2MV 2_2MV range DC offset Group ZC_2_2MV Name Default...
  • Page 156 5790B Service Manual Group ZC_7MV Name Default Function Z_7MV 7MV range zero SHO_7MV 7MV AUX input offset IA_7MV 0.00316228 7MV range A/D volts per input volt Group AC_7MV Name Default Function F1_7MV 7MV range flatness correction 1 (10 Hz) F2_7MV...
  • Page 157 Appendices Calibration Constant Information Group AC_22MV Name Default Function F1_22MV 22MV range flatness correction 1 (10 Hz) F2_22MV 22MV range flatness correction 2 (100 Hz) F3_22MV 22MV range flatness correction 3 (1 kHz) F4_22MV 22MV range flatness correction 4 (10 kHz) F5_22MV 22MV range flatness correction 5 (20 kHz) F6_22MV...
  • Page 158 5790B Service Manual Group DC_220MV Name Default Function DI_220MV 50.0 220MV range DAC volts per input volt OF_220MV 220MV range DC offset Group ZC_220MV Name Default Function Z_220MV 220MV range zero SHO_220MV 220MV AUX input offset IA_220MV 220MV range A/D volts per input volt...
  • Page 159 Appendices Calibration Constant Information Group AC_700MV Name Default Function F1_700MV 700MV range flatness correction 1 (10 Hz) F2_700MV 700MV range flatness correction 2 (100 Hz) F3_700MV 700MV range flatness correction 3 (1 kHz) F4_700MV 700MV range flatness correction 4 (10 kHz) F5_700MV 700MV range flatness correction 5 (20 kHz) F6_700MV...
  • Page 160 5790B Service Manual Group DC_7V Name Default Function DI_7V 7V range DAC volts per input volt OF_7V 7V range DC offset Group ZC_7V Name Default Function Z_7V 7V range zero SHO_7V 7V AUX input offset IA_7V 3.16228 7V range A/D volts per input volt...
  • Page 161 Appendices Calibration Constant Information Group DC_22V Name Default Function DI_22V 22V range DAC volts per input volt OF_22V 22V range DC offset Group ZC_22V Name Default Function Z_22V 22V range zero SHO_22V 22V AUX input offset IA_22V 10.0 22V range A/D volts per input volt Group AC_22V Name Default...
  • Page 162 5790B Service Manual Group DC_70V Name Default Function DI_70V 70V range DAC volts per input volt OF_70V 70V range DC offset Group ZC_70V Name Default Function Z_70V 70V range zero SHO_70V 70V AUX input offset IA_70V 31.6228 70V range A/D volts per input volt...
  • Page 163 Appendices Calibration Constant Information Group AC_220V Name Default Function F1_220V 220V range flatness correction 1 (10 Hz) F2_220V 220V range flatness correction 2 (100 Hz) F3_220V 220V range flatness correction 3 (1 kHz) F4_220V 220V range flatness correction 4 (10 kHz) F5_220V 220V range flatness correction 5 (20 kHz) F6_220V...
  • Page 164 5790B Service Manual Group DC_1000V Name Default Function DI_1000V 0.005 1000V range DAC volts per input volt OF_1000V 1000V range DC offset Group ZC_1000V Name Default Function Z_1000V 1000V range zero SHO_1000V 1000V AUX input offset IA_1000V 1000.0 1000V range A/D volts per input volt...
  • Page 165 Appendices Calibration Constant Information Group WAC_2_2MV Name Default Function F1_2_2MV_WB 2_2MV range, wideband input, flatness correction 1 (10 Hz) F2_2_2MV_WB 2_2MV range, wideband input, flatness correction 2 (50 Hz) F3_2_2MV_WB 2_2MV range, wideband input, flatness correction 3 (400 Hz) F4_2_2MV_WB 2_2MV range, wideband input, flatness correction 4 (1 kHz) F5_2_2MV_WB 2_2MV range, wideband input, flatness correction 5 (2 kHz)
  • Page 166 5790B Service Manual Group WDC_7MV Name Default Function DI_7MV_WB 1000.0 7MV range, wideband input, DAC volts per input volt IA_7MV_WB 7MV range A/D volts per input volt Group WAC_7MV Name Default Function F1_7MV_WB 7MV range, wideband input, flatness correction 1 (10 Hz)
  • Page 167 Appendices Calibration Constant Information Group WDC_22MV Name Default Function DI_22MV_WB 500.0 22MV range, wideband input, DAC volts per input volt IA_22MV_WB 0.316228 22MV range A/D volts per input volt Group WAC_22MV Name Default Function F1_22MV_WB 22MV range, wideband input, flatness correction 1 (10 Hz) F2_22MV_WB 22MV range, wideband input, flatness correction 2 (50 Hz) F3_22MV_WB...
  • Page 168 5790B Service Manual Group WAC_70MV Name Default Function F1_70MV_WB 70MV range, wideband input, flatness correction 1 (10 Hz) F2_70MV_WB 70MV range, wideband input, flatness correction 2 (50 Hz) F3_70MV_WB 70MV range, wideband input, flatness correction 3 (400 Hz) F4_70MV_WB 70MV range, wideband input, flatness correction 4 (1 kHz)
  • Page 169 Appendices Calibration Constant Information Group WDC_220MV Name Default Function DI_220MV_WB 31.6228 220MV range, wideband input, DAC volts per input volt IA_220MV_WB 3.16228 220MV range A/D volts per input volt Group WAC_220MV Name Default Function 220MV range, wideband input, flatness correction 1 F1_220MV_WB (10 Hz) 220MV range, wideband input, flatness correction 2...
  • Page 170 5790B Service Manual Group WDC_700MV Name Default Function DI_700MV_WB 10.0 700MV range, wideband input, DAC volts per input volt IA_700MV_WB 10.0 700MV range A/D volts per input volt Group WAC_700MV Name Default Function 700MV range, wideband input, flatness correction 1...
  • Page 171 Appendices Calibration Constant Information Group WDC_2_2V Name Default Function DI_2_2V_WB 3.16228 2_2V range, wideband input, DAC volts per input volt IA_2_2V_WB 31.6228 2_2V range A/D volts per input volt Group WAC_2_2V Name Default Function F1_2_2V_WB 2_2V range, wideband input, flatness correction 1 (10 Hz) F2_2_2V_WB 2_2V range, wideband input, flatness correction 2 (50 Hz) F3_2_2V_WB...
  • Page 172 5790B Service Manual Group WAC_7V Name Default Function F1_7V_WB 7V range, wideband input, flatness correction 1 (10 Hz) F2_7V_WB 7V range, wideband input, flatness correction 2 (50 Hz) F3_7V_WB 7V range, wideband input, flatness correction 3 (400 Hz) F4_7V_WB 7V range, wideband input, flatness correction 4 (1 kHz)

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