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Agilent Technologies 1156A User Manual

1.5 ghz active probe
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User's Guide
Publication number 01156-97002
September 2005
For Safety and Regulatory information, see the pages at the back of this guide.
© Copyright Agilent Technologies 2001-2002, 2005
All Rights Reserved.
1156A 1.5 GHz Active Probe
Visit us at www.TestEquipmentDepot.com
Back to the Agilent 1156a Product Info Page
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
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Summary of Contents for Agilent Technologies 1156A

  • Page 1 Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com Back to the Agilent 1156a Product Info Page User’s Guide Publication number 01156-97002 September 2005 For Safety and Regulatory information, see the pages at the back of this guide.
  • Page 2 In This Book This guide provides user and service information for the 1156A 1.5 GHz Active Probe. Chapter 1 gives you general information such as inspection, cleaning, accessories supplied, and specifications and characteristics of the probe. Chapter 2 shows you how to operate the probe and gives you information about some important aspects of probing and how to get the best results with your probe.

  • Page 3: Table Of Contents

    Solderable Through-hole Ground Pin 33 Micro Clip 37 Undamped Accessories 37 3 Service Service Strategy 42 To return the probe to Agilent Technologies for service 43 Troubleshooting 44 Failure Symptoms 44 Probe Calibration Fails 44 Incorrect High Frequency Response 44...

  • Page 4: General Information

    General Information 1156A 1.5 GHz Active Probe The 1156A 1.5 GHz Active Probe is a probe solution for high-frequency applications. This probe is compatible with the AutoProbe Interface which completely configures the Infiniium series of oscilloscopes for the probe.

  • Page 5: To Inspect The Probe

    Office. • If the shipping container is damaged, or the cushioning materials show signs of stress, notify the carrier as well as your Agilent Technologies Sales Office. Keep the shipping materials for the carrier’s inspection. The Agilent Technologies Office will arrange for repair or replacement at Agilent Technologies’...

  • Page 6: Accessories Supplied

    General Information Accessories Supplied Accessories Supplied The following figure and table show the accessories supplied with the 1156A Active Probe. Figure 1-2...
  • Page 7 General Information Accessories Supplied Table 1-1 Accessories Supplied Item Description Qty Agilent Part Number 130 Ω resistive signal pin (orange) 12 01156-27616 Solderable-tip 5 cm resistive signal lead 2 01156-82106 Socket-end 5 cm resistive signal lead 2 01156-82105 Socket-end 10 cm resistive signal lead 2 01156-82108 Micro clip 2 5063-2180...

  • Page 8: Replaceable Parts And Additional Accessories

    General Information Replaceable Parts and Additional Accessories Replaceable Parts and Additional Accessories Table 1-2 Replaceable Parts and Additional Accessories Agilent Part Number Description E2638A Solderable-tip 5 cm resistive signal lead Solderable-tip 5 cm ground lead E2639A Micro clip 130 Ω resistive signal pin (orange) E2640A E2641A Ground blade assembly...

  • Page 9: Characteristics And Specifications

    The following characteristics are typical for the active probe. Table 1-3 Characteristics Bandwidth (-3 dB) > 1.5 GHz System bandwidth (-3 dB) 1156A with 54832B/D or 54835A scope: 1 GHz 0.35 Rise and Fall Time (10% to 90%) < 233 ps calculated from ---------------------------- - Bandwidth Input Capacitance 0.8 pF...

  • Page 10: General Characteristics

    General Information General Characteristics General Characteristics The following general characteristics apply to the active probe. Table 1-4 General Characteristics Environmental Conditions Operating Non-operating 0 °C to +55 °C −40 °C to +70 °C Temperature Altitude 4000 meter (13,000 ft) up to 90% relative humidity at +65 °C up to 95% relative humidity Humidity (non-condensing) at +40 °C...
  • Page 11 General Information General Characteristics Figure 1-3 5.61 mm 0.221 in. Center of ground socket Center of signal socket 4.9 mm 01158e20.cdr 0.193 in. 1156A Active Probe Dimensions...

  • Page 12: To Use The Probe

    To use the probe The Infiniium family of oscilloscopes provides both power and offset control to the 1156A active probe through the front panel connector. Probe offset is changed by adjusting the vertical offset control on the Infiniium oscilloscope. The control should be adjusted to center your waveform within the 5 volt peak-to-peak (12 volts peak-to-peak for slow waveforms) dynamic range of the probe.

  • Page 13: Using Probe Accessories

    Using Probe Accessories Using Probe Accessories Before you can use the 1156A probe you must install the signal and ground accessories that you want to use. As an example, the following figure shows the installation of the 130 Ω resistive signal pin (orange) and the ground blade assembly into the probe.

  • Page 14: To Connect The Probe

    General Information To connect the probe To connect the probe Connect the probe output to the oscilloscope input. Calibrate the oscilloscope and probe combination using the Infiniium probe calibration routine. When the probe has been calibrated, the dc gain, offset zero, and offset gain will be calibrated.

  • Page 15: Operating The Probe

    The bandwidth of the 1156A active probe is higher than the resonant frequency of the physical connection to the probed circuit, even when using the smallest possible physical connection. Placing a resistor between the circuit being probed and the parasitics of the physical connection isolates the circuit being probed from this resonance.
  • Page 16 Operating the Probe the parasitics of the physical connection. Even when using the socket-end 10 cm resistive signal lead, the response and input impedance of the probe are very well behaved. Other signal lead lengths may be used with this probe but a resistance value needs to be determined from the following figure and a resistor of that value needs to be placed as close as possible to the point being probed.
  • Page 17 Operating the Probe When simulating circuits that include a load model for the probe, a simplified model of the probes input impedance can usually be used. The following figure and table contain the information for the simplified model of the probe. For more accurate load models, see the following sections.

  • Page 18: 110 Ohm Resistive Signal Pin (Green) And Solderable Ground Socket

    Board trace The 1156A probe has an input impedance which varies with frequency. The following schematic shows the circuit model for the input impedance of the probe when using the 110 Ω resistive signal pin (green) and solderable ground socket.
  • Page 19 Operating the Probe 110 Ohm Resistive Signal Pin (Green) and Solderable Ground Socket 110 Ω Resistive Signal Pin (green) and Solderable Ground Socket Input Impedance Model Magnitude Plot of Probe Input Impedance Versus Frequency Measured 125 Ω Modeled Frequency...
  • Page 20 Operating the Probe 110 Ohm Resistive Signal Pin (Green) and Solderable Ground Socket Graph of Vin to Probe and Vout of Probe with a 25 Ω Source Frequency Vout/Vin Frequency Response Frequency...
  • Page 21 Operating the Probe 110 Ohm Resistive Signal Pin (Green) and Solderable Ground Socket All probes have a loading effect on a circuit when they come in contact with the circuit. The following graph shows how the 110 Ω resistive signal pin (green) and solderable ground socket configuration affect a step from a 25 Ω...

  • Page 22: 130 Ohm Resistive Signal Pin (Orange) And Ground Blade Assembly

    Probing using the 130 Ω resistive signal pin (orange) and ground blade assembly Orange-colored resistive signal pin The 1156A probe has an input impedance which varies with frequency. The following schematic shows the circuit model for the input impedance of the probe...
  • Page 23 Operating the Probe 130 Ohm Resistive Signal Pin (Orange) and Ground Blade Assembly 130 Ω Resistive Signal Pin (Orange) and Ground Blade Input Impedance Model Magnitude Plot of Probe Input Impedance Versus Frequency Measured 165 Ω Modeled Frequency...
  • Page 24 Operating the Probe 130 Ohm Resistive Signal Pin (Orange) and Ground Blade Assembly Graph of Vin to Probe and Vout of Probe with 25 Ω Source Frequency Vout/Vin Frequency Response Frequency...
  • Page 25 Operating the Probe 130 Ohm Resistive Signal Pin (Orange) and Ground Blade Assembly All probes have a loading effect on a circuit when they come in contact with the Ω circuit. The following graph shows how the 130 resistive signal pin (orange) and ground blade assembly configuration affect a step from a 25 Ω...

  • Page 26: Cm Resistive Signal Leads And Solderable Smt Or Solderable Through-Hole Ground Pin

    Operating the Probe 5 cm Resistive Signal Leads and Solderable SMT or Solderable Through-hole Ground Pin 5 cm Resistive Signal Leads and Solderable SMT or Solderable Through-hole Ground Pin These configurations are used to attach the probe to a round or a square pin of a header or to solder to the legs of a device under test.
  • Page 27 5 cm Resistive Signal Leads and Solderable SMT or Solderable Through-hole Ground Pin The 1156A probe has an input impedance which varies with frequency. The following schematic shows the circuit model for the input impedance of the probe when using the 5 cm resistive signal lead and a solderable smt or through-hole ground lead.
  • Page 28 Operating the Probe 5 cm Resistive Signal Leads and Solderable SMT or Solderable Through-hole Ground Pin Graph of Vin to Probe and Vout of Probe with a 25 Ω Source Frequency Vout/Vin Frequency Response Frequency All probes have a loading effect on a circuit when they come in contact with the circuit.
  • Page 29 Operating the Probe 5 cm Resistive Signal Leads and Solderable SMT or Solderable Through-hole Ground Pin 25 Ω Step Generator With and Without Probe Connected Time (ns) Vin and Vout of Probe Time (ns) This is not the step response of the probe. The step response of a probe is the output of a probe while the input is a perfect step.

  • Page 30: Socket-End 10 Cm Resistive Signal Lead And Solderable Smt Or Solderable Through-Hole Ground Pin

    The properly damped 10 cm wire with a very short ground connection produces a high quality, repeatable 850 MHz probe. The 1156A probe has an input impedance which varies with frequency. The following schematic shows the circuit model for the input impedance of the probe when using the socket-end 10 cm resistive signal lead and a solderable smt or through-hole ground lead.
  • Page 31 Operating the Probe Socket-end 10 cm Resistive Signal Lead and Solderable SMT or Solderable Through- hole Ground Pin 10 cm Resistive Signal Lead Input Impedance Model Magnitude Plot of Probe Input Impedance Versus Frequency Modeled 275 Ω Measured Frequency...
  • Page 32 Operating the Probe Socket-end 10 cm Resistive Signal Lead and Solderable SMT or Solderable Through- hole Ground Pin Graph of Vin to Probe and Vout of Probe with a 25 Ω Source Frequency Vout/Vin Frequency Response Frequency All probes have a loading effect on a circuit when they come in contact with the circuit.
  • Page 33 Operating the Probe Socket-end 10 cm Resistive Signal Lead and Solderable SMT or Solderable Through- hole Ground Pin 25 Ω Step Generator With and Without Probe Connected Time (ns) Vin and Vout of Probe Time (ns) This is not the step response of the probe. The step response of a probe is the output of a probe while the input is a perfect step.

  • Page 34: Micro Clip

    Operating the Probe Micro Clip Micro Clip The Micro Clip is used when easy to connect, hands-free probing of a circuit is required. The Micro Clip can be used on the signal lead, the ground lead, or both. Although this configuration is damped, it is not optimally damped and should not be used to measure waveforms with rise times less than 1 ns Figure 2-2 Socket-end 5 cm ground lead...
  • Page 35 Operating the Probe Undamped Accessories 5 cm Undamped Signal Wire Lead Magnitude Plot of Probe Input Impedance Versus Frequency Frequency...
  • Page 36 Operating the Probe Undamped Accessories Graph of Vin to Probe and Vout of Probe with a 25 Ω Source Frequency Vout/Vin Frequency Response Frequency...
  • Page 37 Operating the Probe Undamped Accessories 25 Ω Step Generator With and Without Probe Connected Time (ns) Vin and Vout of Probe Time (ns)

  • Page 38: Service

    • Troubleshooting and failure symptoms Service Strategy The 1156A Active Probe is a high frequency device with many critical relationships between parts. For example, the frequency response of the amplifier on the hybrid is trimmed to match the output coaxial cable. As a result, to return the probe to optimum performance requires factory repair.

  • Page 39: To Return The Probe To Agilent Technologies For Service

    To return the probe to Agilent Technologies for service To return the probe to Agilent Technologies for service Before shipping the probe to Agilent Technologies, contact your nearest Agilent Technologies Sales Office for additional details. 1 Write the following information on a tag and attach it to the probe.

  • Page 40: Troubleshooting

    Troubleshooting • If your probe is under warranty and requires repair, return it to Agilent Technologies. Contact your nearest Agilent Technologies Service Center. • If the failed probe is not under warranty, you may exchange it for a reconditioned probe. See "To Prepare the Probe for Exchange" in this chapter.

  • Page 41: Incorrect Low Frequency Response (Pulse Flatness)

    ±3 mV. If the probe is connected to an Infiniium oscilloscope, the oscilloscope will calibrate out the offset zero error during a probe calibration. If the offset error cannot be calibrated out, return it to Agilent Technologies for repair.

  • Page 42: Verifying Probe Input Resistance

    Service Verifying probe input resistance Verifying probe input resistance Specification: 100 kΩ ±1% Equipment Required Equipment Critical Specification Recommended Model/Part Digital Multimeter (DMM) Resistance ±1% 34401A 1 Connect the DMM probes between the probe tip and the ground at the tip of the probe.
  • Page 43 Index accessories repair 43 additional 10 replaceable parts 10 bandwidth 18 returning probe to Agilent Technologies 43 supplied 8 service strategy 42 bandwidth 18 specifications 11 specifcation 11 troubleshooting 44 calibration failure 44 probe with oscilloscope 16 weight 12 cleaning the instrument 49...
  • Page 44 • Whenever it is likely that the ground protection is impaired, you must make the instrument inoperative and secure it against any unintended opera- tion. Agilent Technologies P.O. Box 2197 1900 Garden of the Gods Road Colorado Springs, CO 80901...

  • Page 45: Operating Procedure

    (b)(2) (November 1995), as applicable in any technical data. Visit us at www.TestEquipmentDepot.com Document Warranty Back to the Agilent 1156a Product Info Page The material contained in this document is provided “as is,” and is subject to being changed, without notice, in future editions.

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