Keysight 41800A Operation Note
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Keysight 41800A Operation Note

Keysight 41800A Operation Note

Active probe
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Keysight 41800A Active Probe
Operation Note

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Summary of Contents for Keysight 41800A

  • Page 1 Keysight 41800A Active Probe Operation Note...
  • Page 2 Keysight Declarations of Conformity for this 2.101, pursuant to FAR 12.211 and Technologies, Inc. as governed by product and for other Keysight prod- 27.404.2 and DFARS 227.7102, the United States and international ucts may be downloaded from the U.S.

  • Page 3: Table Of Contents

    Operating Check Using the Keysight 4195A ........
  • Page 4 Troubleshooting Guide ............61 Keysight 41800A Active Probe...

  • Page 5: General Information

    41800A for use. Product Description The 41800A is an Active Probe used with network and spectrum analyzers for circuit signal analysis. The following are the main features of the 41800A. • Wide frequency range; 5 Hz to 500 MHz •...

  • Page 6: Safety Considerations

    General Information Safety Considerations Safety Considerations The 41800A Active Probe conforms to the safety requirements for IEC 348, and CSA 556B rated instruments, and is shipped from the factory in a safe condition. This operation note contains information, CAUTIONS and WARNINGS which must be followed by the user to ensure safe operation.

  • Page 7: Product Contents

    General Information Product Contents Product Contents Table 1-2 lists the contents of the 41800A. Refer to Figure 2-1 for details. Table 1-2 Contents of the 41800A Description Quantity Probe Assembly Keysight Probe-BNC (m) Adapter 10: 1 Divider 100: 1 Divider...

  • Page 8: Specifications

    Specifications Specifications The specifications for the 41800A Active Probe are listed below. The specifications are performance standards or limits. The 41800A meets all of the specifications listed below when it is shipped from the factory. • Specifications describe the instrument's warranted performance over the temperature range of 23 ±...
  • Page 9 50 Ω Type N male Power: +15 V/60 mA, –12.6 V/60 mA Weight: 0.3 kg (probe alone) 2 kg (included accessories) Length: Approximately 1.2 m Operating Temperature Humid ity: 0 °C to 55 °C, RH ~95% (40 °C) Keysight 41800A Active Probe...
  • Page 10 General Information Specifications Furnished Accessories: Probe-BNC (m) Adapter 10:1 Divider 100: 1 Divider Slip-on Spanner Ground Tip Ground Clip (flexible) Probe Tip Nut Driver (3/32 inch) 10229A Hook Tip Adapter Spare Probe Pin Set Carrying Case Keysight 41800A Active Probe...

  • Page 11: Installation

    Initial Inspection Electrostatic Discharge (ESD) can damage the 41800A probe's highly sensitive input amplifier. NEVER touch the probe pin! The 41800A Active Probe meets all of the specifications listed in “Specifications” on page 8. Upon receipt, inspect the shipping container for damage.
  • Page 12 7 Probe Tip Nut Driver (3/32 inch) P/N 8710-1806 8 1O229A Hook Tip Adapter P/N 5060-0549 9 Spare Probe Pin Set P/N 41800-60021 (12 mil pin ×3, 30 mil pin ×3) 10 Carrying Case P/N 41800-60001 1. Keysight internal-only part number. Keysight 41800A Active Probe...

  • Page 13: Power Requirements

    Table 1-1 by connecting the 41800A's power plug to the probe power jack on the instrument. If the instrument used with the 41800A does not have a probe power supply, use a separate power supply which meets the requirements listed in Figure 2-2.

  • Page 14: Packaging

    The following general instructions should be used for repacking with commercially available materials. 1. Wrap the unit in heavy paper or plastic. If shipping to a Keysight sales office or service center, attach a tag indicating the type of service required, return address, model number, and full serial number.

  • Page 15: Operation

    Probe Pin Replacement Overview This paragraph provides a description of the probe assembly and each of its furnished accessories including their usage. Figure 3-1 shows an overview of the 41800A probe assembly and Figure 3-2 shows the accessories furnished with the 41800A.
  • Page 16 Figure 3-1 41800A Probe Assembly Probe Assembly The 41800A probe assembly is equipped with a grounded protective sleeve to protect (Protective Sleeve) the probe tip from mechanical abuse and to reduce the chance of ESD damage. Extend the protective sleeve when not actually making measurements.
  • Page 17 The effects of improper grounding become greater as the frequency increases. For optimum measurements in a factory environment, design your circuits with ground plane feed throughs next to each test point. Keysight 41800A Active Probe...
  • Page 18 Adapter Probe Pins Two kinds of probe pins, 12 mil pin and 30 mil pin, are available for the 41800A. Three 12 mil pins and three 30 mil pins are furnished with the 41800A as spare probe pin set. The 41800A is shipped from the factory with a 30 mil pin installed.

  • Page 19: Operating Precautions

    Operation Operating Precautions Operating Precautions This paragraph describes precautions for using the 41800A to prevent from damage on the 41800A and your Device Under Test (DUT). Anti-static Precautions The 418OOA is sensitive to electrostatic discharge (ESD). The followings must be adhered to when using the 41800A.

  • Page 20: Preparation For Use

    These operating check procedures are only intended to ensure that the 41800A is functional. If the 41800A fails this check, it should be repaired. To verify that the 41800A meets its specifications, perform the PERFORMANCE TEST described in SECTION 4.

  • Page 21: Operating Check Using A Network Analyzer

    The Keysight 11880A probe-N(m) adapter can be used instead of the N(m)-BNC(f) adapter and the Keysight 10218A probe-BNC(m) adapter. The signal level should be –26 dBm ± 5 dB when the Keysight 11880A probe-N(m) adapter is used. Operating Check Using a Network Analyzer Figure 3-4 shows the operating check setup using a network analyzer.

  • Page 22: Operating Check Using A Spectrum Analyzer

    3. Confirm that the signal level is –4 dBm ± 5 dB. Operating Check Using a Spectrum Analyzer Figure 3-5 shows the operating check setup using a spectrum analyzer. Figure 3-5 Operating Check Setup Using a Spectrum Analyzer Keysight 41800A Active Probe...

  • Page 23: 10:1/100:1 Divider Adjustments

    3. Confirm that the signal level is (calibration output level + 6 dB) ± 5 dB. 10:1/100:1 Divider Adjustments This adjustment procedure is used to adjust the 10:1/100:1 divider's gain. This adjustment requires the Keysight 4195A, any compatible Network Analyzer, or any compatible Spectrum Analyzer. Figure 3-6...
  • Page 24 2. Connect the 41800A's OUTPUT connector to the instrument's INPUT connector.Insert the 41800A's probe tip into the probe adapter. 3. Note the measured value, and remember it as data R. Data R is used in steps 7 and 9.
  • Page 25 Preparation for Use 10:1 Divider Adjustment 5. Connect the 10:1 divider to the 41800A's probe tip, and insert it into the probe adapter on the instrument's input connector. 6. Adjust the trimmer component from the opening of the divider, shown in...

  • Page 26: Typical Measurement Setups

    — Using the 41800A with an instrument which has a type-N input connector — Using the 41800A with an instrument which has a BNC input connector Electrostatic Discharge (ESD) can damage the 41800A 's highly sensitive input amplifier. Never touch the probe pin! Do not apply an ac+dc level which exceeds ±50 V (±200 V when using a...

  • Page 27: Network Measurements

    Place the probe tip as close to the input of the device under test, and perform a normalize (through) calibration to compensate the frequency response error. Figure 3-8 Network Measurement Setup Example (Using One 41800A) Keysight 41800A Active Probe...
  • Page 28 Operation Typical Measurement Setups Using One 41800A with a Transmission/Reflection Test Set Figure 3-9 shows a typical measurement setup for the network measurements using with a transmission/reflection test set. Place the probe tip as close to the input of the device under test, and perform a normalize (through) calibration to compensate the frequency response error.
  • Page 29 Place the probe tip as close to the input of the device under test, and perform a normalize (through) calibration to compensate the frequency response error. Figure 3-10 Network Measurement Setup Example (Using Two 41800As) Keysight 41800A Active Probe...

  • Page 30: Spectrum Measurements

    Operation Typical Measurement Setups Spectrum Measurements Using the 41800A with Instruments Which Have Type-n Connectors Figure 3-11 shows a typical measurement setup using a spectrum analyzer which has a type-N input connector. Figure 3-11 Spectrum Measurement Setup Example (Type-N Input Connector)
  • Page 31 BNC input connector. A BNC(m) cable and N(f)-BNC(f) adapter are recommended to use tor connecting the 41800A to the spectrum analyzer. Do not use an inflexible adapter such as a BNC(m)-N(f) adapter instead of the cable and N(f)-BNC(f) adapter, otherwise the overweight caused by the 41800A may damage the spectrum analyzer's connector.

  • Page 32: Probe Pin Replacement

    Wear a snug-fitting ground strap to touch the probe pin. Do not touch the probe pin directly. The 30 mil probe pin must be used to adapt to the Keysight probe-BNC(m) adapter, the 10:1/100:1 dividers, the slip-on spanner ground tip, the hook tip adapter, or the Keysight probe-N(m) adapter.

  • Page 33: Performance Tests

    Keysight 41800A Active Probe Operation Note Performance Tests Introduction This section provides performance test procedures to ensure that the 41800A meets the specifications listed in “Specifications” on page 8. The performance test can be performed without accessing the interior of the 41800A.

  • Page 34: Calibration Cycle

    1. The test equipment must be allowed to warm-up and stabilize for at least 30 minutes. 2. A Keysight 4195A is required to test the 41800A. In the remainder of this manual, softkeys are indicated in boldface type and enclosed in single quotes (e.g., 'NETWORK' softkey), and keys are indicated in boldface type...

  • Page 35: Probe Gain/Frequency Response Tests

    0 dB ±0.5 dB at 50 MHz Frequency Response: +1 dB/–2 dB at |50 Hz (relative to 50 MHz) ±1 dB at 50 Hz to 200 MHz +1.5 dB/–2 dB at }200 MHz Setup Figure 4-1 Probe Gain/Frequency Response Test Setup Keysight 41800A Active Probe...

  • Page 36: Equipment

    1. Connect the power splitter to the Keysight 4195A as shown in Figure 4-1 (1). 2. Sequentially press the following Keysight 4195A front panel keys, to set the Keysight 4195A to the Probe Gain/Frequency Response test settings. CONFIG, 'NETWORK', PRESET...
  • Page 37 8. Press the SCALE REF key and the 'A AUTO SCALE' softkey for auto scaling. 9. Move the o marker on the Keysight 4195A's display to the 50 MHz sweep point by rotating the rotary knob on the Keysight 4195A's front panel.
  • Page 38 13.Press the MKR& key and the 'MKR&MAX' softkey to move the o marker to the maximum point between 10 Hz and 50 Hz. And confirm that the T/R data displayed on the upper right corner of the Keysight 4195A's display is within +1 dB/–2 dB.
  • Page 39 T/R is within +1.5 dB/–2 dB. 20.Press the 'MKR&MIN' softkey to move the marker to the minimum point between 200 MHz and 500 MHz, and confirm that the T/R data is within +1.5 dB/–2 dB. Keysight 41800A Active Probe...

  • Page 40: Db Gain Compression Tests

    The 1 dB Gain Compression Test checks the gain compression of the probe amplifier. Specifications (at 23 °C ± 5 °C) } +3 dBm at 500 MHz Setup Figure 4-2 1 dB Gain Compression Test Setup Keysight 41800A Active Probe...

  • Page 41: Equipment

    3. Set the power meter to the dBm mode, and set the CAL FACTOR % knob to the value required by the power sensor at 500 MHz, and zero the meter. 4. Connect the power splitter to the Keysight 4195A, and connect the power sensor to the power splitter as shown in Figure 4-2 (1).
  • Page 42 Performance Tests 1 dB Gain Compression Tests 8. Disconnect N(m)-N(m) Cable from the power splitter, and connect the 41800A between the power splitter and N(m)-N(m) Cable, as shown in Figure 4-2 (2). 9. Press the Keysight 4195A's TRIG/RESET key to make a single sweep measurement.

  • Page 43: Performance Test Record

    ±1 dB ____________________ dB Max. at f } 200 MHz: +1.5 dB/–2 dB ____________________ dB Min. at f } 200 MHz: +1.5 dB/–2 dB ____________________ dB 1 dB GAIN COMPRESSION: Specification } 3 dBm ____________________ dB Keysight 41800A Active Probe...
  • Page 44 Performance Tests Performance Test Record Keysight 41800A Active Probe...

  • Page 45: Adjustment

    1. The test equipment must be allowed to warm-up and stabilize for at least 30 minutes. 2. A Keysight 4195A is required to test the 41800A. In the remainder of this manual, softkeys are indicated in boldface type and enclosed in single quotes (e.g., 'NETWORK' softkey), and keys are indicated in boldface type...

  • Page 46: Lf Gain/Flatness Adjustment

    Adjustment LF Gain/Flatness Adjustment LF Gain/Flatness Adjustment Description The LF Gain/Flatness Adjustment adjusts the 41800A gain and frequency response. Setup Figure 5-1 LF Gain/Flatness Adjustment Setup Equipment Network Analyzer Keysight 4195A Power Splitter Keysight 11667A Probe to N(m) Adapter Keysight 11880A...

  • Page 47: Procedure

    “Cal completed” is displayed. CAL, 'TRANS CAL menu', 'NORMLIZE (THRU)', 'THRU', ENTER/EXECUTE 4. Press the Keysight 4195A's CAL key and the 'CORRECTN on off' softkey to activate the Keysight 4195A's correction capability. The “on” in this softkey will change to intensified green.
  • Page 48 8. Press the TRIG/RESET key, and the 'CONT mode' softkey to select the continuous sweep mode. 9. Adjust R18 (LF GAIN) and R25 (FLATNESS) so that the T/R data displayed by the Keysight 4195A is within ±0.5 dB for the data at 50 MHz, as shown in Figure 5-3.

  • Page 49: Service

    Table 6-1 Table 6-3 gives the Keysight part number, quantity (Qty.), and description. To order a part listed in Table 6-1 Table 6-3, indicate the Keysight part number and the quantity desired. Address your order to the nearest Keysight Technologies office.
  • Page 50 Retainer CE Ring 0905-1150 0905-1150 0 Ring 41800-60005 PC Board/Heatsink Assembly 41800-61071 41800-60002 41800-60008 Nose Assembly 41800-60003 41800-60003 12 mil Probe Pin Assembly 41800-60004 41800-60004 30 mil Probe Pin Assembly 1. RoHS compliant replacement part description: Probe Assembky Keysight 41800A Active Probe...
  • Page 51 Description Designator Compliant Replacement Part Number 41800-87111 41800-87111 Label 0515-1873 0515-1602 Screw Metric 41800-04001 41800-04001 Cover 0515-0976 0515-0677 Screw M2 L6 2190-0654 2190-0654 Washer 41800-66502 Amplifier/Regulator Board 41800-61071 Assembly 1401-0214 1401-0214 PVC Cap 41800-87112 41800-87172 Label Keysight 41800A Active Probe...
  • Page 52 1. RoHS compliant replacement part description: Probe Assembly 2. RoHS compliant replacement part description: Connector RF Plug 50 Ohm Table 6-3 Replaceable Parts (3 of 3) RoHS Reference Compliant Part Number Qty. Description Designator Replacement Part Number Probe Assembly 41800-61001 41800-61071 Keysight 41800A Active Probe...

  • Page 53: Disassembly

    Board Assembly (PN 41800-66502), and the PC Board/Heatsink Assembly (PN 41800-60005). Removing the Amplifier/Regulator Board Assembly requires removing the labels on the 41800A. The labels will be damaged when you remove them. Use new labels after reassembling the 41800A (you must order the labels). Amplifier/Regulator Board Assembly Removal 1.
  • Page 54 Amplifier/Regulator Board Disassembly 5. Disconnect the coaxial cable (item 1 in Figure 6-2) from the SMB connector on the Amplifier/Regulator Board assembly. 6. Remove the leads, item 2 through 8 on Figure 6-2, from the Amplifier/Regulator Board assembly. Keysight 41800A Active Probe...
  • Page 55 9. Remove the N(m) connector from the CASE toward the arrow B shown Figure 6-2, while holding the soldering iron at point 9 as shown in Figure 6-2. 10.Remove the four screws holding the Amplifier/Regulator Board assembly in place. 11.Remove the Amplifier/Regulator Board assembly from the CASE. Keysight 41800A Active Probe...

  • Page 56: Pc Board/Heatsink Assembly Disassembly

    Use a wrench to hold the NOSE piece at position A as shown in Figure 6-6. b. Remove the NOSE piece by rotating it in the direction of arrow B as shown in Figure 6-6. c. Remove the NOSE piece. Keysight 41800A Active Probe...
  • Page 57 6. Slide the O RING in direction A as shown in Figure 6-8. Figure 6-8 O Ring and Lead Removal 7. Remove leads No. 1 through 5 as shown in Figure 6-8, from the PC Board/Heatsink assembly. Keysight 41800A Active Probe...
  • Page 58 Hold the probe at positions A and B as shown in Figure 6-9 using pliers or a wrench. b. Remove the PC Board/Heatsink assembly by rotating it in the direction of arrow C as shown in Figure 6-9. Figure 6-9 PC Board/Heatsink Assembly Removal Keysight 41800A Active Probe...

  • Page 59: Theory Of Operation

    Service Theory of Operation Theory of Operation The 41800A active probe consists of amplifiers and regulators. The amplifiers provide unity gain. The amplifiers are on the PC board/Heatsink assembly and the Amplifier/Regulator Board assembly. The regulators convert the DC voltage (+15 V and –12.6 V) supplied from the host instrument, and supply the regulated DC voltages (+15 V, +9 V, –7 V, and...
  • Page 60 S (to Amplifier/Regulator Board) –7 V (from Amplifier/Regulator Board) +9 V (from Amplifier/Regulator Board) (coaxial cable) Figure 6-11 Lead Assignment 5. If the PC board/Heatsink assembly and the Cable assembly is okay, the Amplifier/Regulator board is defective. Keysight 41800A Active Probe...
  • Page 61 This information is subject to change without notice. © Keysight Technologies 1999 - 2019 Edition 4, August 28, 2019 *41800-90010* 41800-90010 www.keysight.com...

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