Agilent Technologies 1155A User manual

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A
User’s Guide
Publication number 01155-92003
July 2003
For Safety and Regulatory information, and publishing information, see the pages at the
back of this book.
©Copyright Agilent Technologies 1998-2003
All Rights Reserved.
1155A 2-Channel, Low-Mass Active
Oscilloscope Probe

2
Contents
Inspect the probe 3
Probe specifications 6
Probe characteristics 6
General characteristics 7
Operating the probe 8
How to replace the probe cable and tip 10
Cleaning the probe 11
Returning the probe to Agilent Technologies for service 11
Adjusting the 1155A 12
Setting up test system 13
Determine probe pass/fail criteria 15
Set up for probe adjustment 16
Adjusting the probe 17
Calibration Testing Procedures 20
Verifying probe input resistance 21
Verifying probe rise time 21
Set up for probe rise time verification 24
!
!

3
Inspect the probe
❏Inspect the shipping container for damage.
Keep a damaged shipping container or cushioning material until the contents of
the shipment have been checked for completeness and the probe has been
checked mechanically and electrically.
❏Check the accessories.
Accessories supplied with the probe are listed in "Accessories supplied" in this
manual.
• If the contents are incomplete or damaged, notify your Agilent Technologies
Sales Office.
❏Inspect the instrument.
• If there is mechanical damage or defect, or if the probe does not operate
properly or pass calibration tests, notify your Agilent Technologies Sales
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’ option without waiting for claim settlement.

4
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Inspect the probe
1155A 2-Channel, Low-Mass Active
Oscilloscope Probe
The 1155A 2-Channel, Low-Mass Active Oscilloscope Probe is a 10:1
probe with a 750 MHz bandwidth. The FET amplifier allows a high-input
resistance (1 MΩ, <2 pF) and low input capacitance which minimizes
the loading of the circuit under test. This active probe is powered by the
Infiniium active interface.
Accessories supplied
Accessories Supplied with the 1155A Active Probe
Item Description
1 Probing pin, quantity supplied is 4
2 SMT clip, quantity supplied is 5
3 Flexible lead, quantity supplied is 2
4 Spacing ground adapter, quantity supplied is 2
5 SMT leads, quantity supplied is 2 red, 2 black
6 BNC-to-Probe Tip Adapter

5
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Inspect the probe
Replacement parts
Replacement accessories
Using the Wedge Probe Adapter
The Wedge Probe Adapter probing solution provides accurate and mechanically
non-invasive contact to the TQFP/PQFP package leads.
Follow the guidelines in the Wedge Probe Adapter User’s Guide for
problem-free probing.
Connecting the Probe to an Wedge Adapter
7 Wedge Probe Adapter (2613A)
You can order additional quantities of these parts. See the ordering information in this manual.
Item Quantity Part number
Probe tip and cable 1 01145-61602
Item Quantity Part number
SMT Leads 4 red, 4 black 16517-82104
Spacing Ground Adapter 20 16517-82105
Flexible Lead 20 16517-82106
Pin Probe Kit 4 16517-82107
SMT Clip 20 16517-82109
0.5 mm x 3-signal Wedge Probe Adapter 1 E2613A
0.5 mm x 3-signal Wedge Probe Adapters 2 E2613B
0.5 mm x 8-signal Wedge Probe Adapter 1 E2614A
0.65 mm x 3-signal Wedge Probe Adapter 1 E2615A
0.65 mm x 3-signal Wedge Probe Adapters 2 E2615B
0.65 mm x 8-signal Wedge Probe Adapters 1 E2616A
Check your Wedge Probe Adapter User’s Guide to verify the latest Wedge models.
Item Description

6
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Probe specifications
Probe specifications
Rise time:1,2 ≤470 ps
Attenuation:310:1 ±3%
Input Resistance: 1 MΩ±2%
1Above 35 °C, bandwidth and rise time degrade approximately 1/2% / °C.
2Bandwidth figure calculated from BW = 0.35 / tr(rise time).
3When connected to an instrument input of 50 Ω±0.5%.
Probe characteristics
Bandwidth:1,2 ≥750 MHz; derived from rise time
Input Capacitance: 2 pF (typical)
Overshoot and Ringing3: Less than ±10% for the first 6 ns,
±4% from 6 ns to 20 µs,
±1.5% thereafter.
Output Voltage Offset Error at output: Less than ±1 mV
Input Dynamic Range: 0 to ±6.0 V
Output Load Requirement: 50 Ω
Maximum Input Voltage: ±40 V (dc + peak ac) (CAT I)
1Above 35 °C, bandwidth and rise time degrade approximately 1/2% / °C.
2Bandwidth figure calculated from BW = 0.35 / tr(rise time).
3Measured with 54845A.
CAT I and CAT II Definitions
Installation category (overvoltage category) I: Signal level, special equipment
or parts of equipment, telecommunication, electronic etc., with smaller transient
overvoltages than installation category (overvoltage category) II.
Installation category (overvoltage category) II: Local level, appliances, portable
equipment etc., with smaller transient overvoltages than installation category
(overvoltage category) III.
!

7
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
General characteristics
General characteristics
General Characteristics of the 1155A Probe
1155A Probe Dimensions
Environmental
Conditions
Operating Non-operating
Temperature 0 °C to +55 °C -40 °C to +70 °C
Humidity Up to 95% relative humidity
(noncondensing) at +40 °C.
Up to 90% relative humidity at +65 °C.
Altitude Up to 4,600 meters. Up to 15,300 meters.
Vibration Random vibration 5 to 500
Hz, 10 minutes per axis, 0.3
grms.
Random vibration 5 to 500 Hz,
10 minutes per axis, 2.41 grms.
Resonant search 5 to 500 Hz swept
sine, 1 octave/minute sweep rate,
(0.75g), 5-minute resonant dwell at
4 resonances per axis.
Weight Net: Approximately 0.23 kg.
Shipping: Approximately 1 kg.
Dimensions Refer to the outline drawing below for approximate dimensions.
Indoor Use
Pollution degree 2 Normally only non-conductive pollution occurs. Occasionally,
however, a temporary conductivity caused by condensation must
be expected.

8
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Operating the probe
Operating the probe
The following information will help you get the most out of your measurement
when operating the probe.
Operating Voltage Derating
Typical Input Impedance vs. Frequency
!

9
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Operating the probe
Typical Rise Time vs. Input Voltage
System bandwidths
The approximate system bandwidths are shown here when using the 1155A
Active Probe with these Infiniium Oscilloscopes:
CAUTION Be sure to limit the input of this probe to voltages within the specified working
voltage. Though the probe is designed with safeguards against static electricity
and noise, the input is sensitive to and may be damaged by excessive voltage.
CAUTION The probe is a delicate device. Dropping it or exposing it to strong vibration or
shock can damage it and cause a malfunction. Handle it with care.
When Using this Scope: System Bandwidth is:
500 MHz Infiniium Oscilloscope Approximately 500 MHz
1.5 GHz Infiniium Oscilloscope Approximately 670 MHz

10
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
How to replace the probe cable and tip
How to replace the probe cable and tip
To replace the main cable
Due to the difficulty in soldering the main cable to the printed circuit assembly,
Agilent Techologies recommends that you return the probe to an Agilent
Technologies Service Center if the main cable or printed circuit assembly needs
to be replaced. Because there are low-temperature solder connections inside
the main cable, make sure you heat sink the main cable before soldering on it.
To replace the probe tip and cable
1Take precautions against electro-static discharge (ESD) by grounding
yourself and the probe.
2Use a Torx 10 screwdriver to remove the four screws holding the probe
pod case together.
3Lift off the top of the probe pod case.
4Use a solder iron to unsolder the center conductor wire of the faulty
probe lead from the bonding pad on the printed circuit assembly.
5Because the ground legs plug into small sockets under the cable, use a
pair of needle nose pliers to lift the faulty probe lead away from the
printed circuit assembly.
6Flow enough solder onto the vacant solder pad for a good solder joint.
7Insert the probe ground legs of the new cable into the circuit board pin
sockets.
8While holding the probe ground legs in position, place the notched
strain relief into the slot of the lower half of the probe cover.
9Because the wire to the center lead is very fragile, use caution when
soldering it. Resolder the center lead on the vacant solder joint. The
resulting solder joint should be very similar to the other probe lead.
10 Inspect the solder joint for good soldering integrity.
11 Check cable alignment inside the probe pod. Replace the top of the
probe pod, then install the four screws.
12 Perform the calibration testing procedures on the probe.

11
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Cleaning the probe
Cleaning the probe
Clean the probe with a mild soap and water and immediately wipe the probe with
a dry cloth. Do not use petroleum based solvents to clean the probe.
Returning the probe to Agilent Technologies for service
Before shipping the instrument to Agilent Technologies, contact your nearest
Agilent Technologies Sales Office for additional details.
1Write the following information on a tag and attach it to the instrument.
• Name and address of owner
• Instrument model number
• Instrument serial number
• Description of the service required or failure indications
2Remove all accessories from the instrument.
Accessories include all cables. Do not include accessories unless they are
associated with the failure symptoms.
3Protect the instrument by wrapping it in plastic or heavy paper.
Antistatic wrapping or packaging is strongly recommended.
4Pack the instrument in foam or other shock absorbing material and
place it in a strong shipping container.
You can use the original shipping materials, or order materials from an Agilent
Technologies Sales Office. If neither are available, place 3 to 4 inches of shock-
absorbing material around the instrument and place it in a box that does not
allow movement during shipping.
5Seal the shipping container securely.
6Mark the shipping container as FRAGILE.
In any correspondence, refer to the instrument by model number and full serial
number.
To order replaceable parts
To order a replaceable part, in the United States call our toll-free hotline at
1-800-452-4844, or call your local Agilent Technologies Sales Office.

12
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Adjusting the 1155A
Adjusting the 1155A
There is no defined adjustment interval for the 1155A active probe.
The adjustments are done at Agilent Technologies and do not require periodic
maintenance. You should only make adjustments when replacing the probe tip.
When making adjustments to the probe, use the BNC-to-probe tip adapter (listed
in the following table). Allow the probe to warm up for at least 15 minutes before
starting adjustments.
Equipment required for making adjustments is listed below. You can substitute
any equipment for the recommended model that satisfies the critical
specifications listed.
Equipment Required
CAUTION Allow the probe to warm up for at least 15 minutes before starting the
adjustments. Failure to allow the probe to warm up may cause faulty
adjustments and failure of calibration test.
Equipment Qty Critical Specification Recommended Model or
Agilent Part Number
Signal Generator 1 Square wave, <200 ps, 0 V to 1 Vp,
<5% flatness, period 50 ms to
50 µs.
8131A (or equivalent)
Oscilloscope 1 >1.5 GHz bandwidth, 50-Ωsource54845A (or equivalent)
Terminations 2 50 ΩBNC plug to BNC socket 10100C (or equivalent)
Coaxial Cables 3 50 Ω, low loss 10503A (or equivalent)
Adapters 3 BNC to SMA 1250-1200
Clip 1 SMT Clip 16517-82109 (pkg of 20)
Adapter 2 BNC to probe tip 5063-2174
Adapter 2 BNC to BNC 1250-0080
Driver 1 Torx: T-10

13
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Setting up test system
Setting up test system
1To determine test system rise time, connect the equipment as shown
below. Then go to the next step to make the control settings on the
oscilloscope.
Setting Up Test System

14
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Setting up test system
2Make the equipment settings as shown below.
Equipment Setup and Initial Characterization
3Adjust the oscilloscope position for leading edge of the waveform to be
2 major divisions from the left-hand side of the screen.
4Drag and drop the rise time icon onto channel 1 rising edge and channel
2 rising edge respectively.
5Press Clear Display button.
6Read the mean rise time after the oscilloscope reaches 4 averages.
7Record the test system rise time for channels 1 and 2.
Mean rise time of channel 1: __________
Mean rise time of channel 2: __________
This information will be required for calculating the 1155A rise time.
You should expect to see that the rise times for channel 1 and channel 2 are
similar.
8131A
Signal
Generator
Control
Ch1 Ch2
Setting
54845A
Acquisition
Control Setting
54845A Trigger
and Display
Control Setting
Mode Auto Horizontal 500 ps Trigger control
Source
Triggered
Channel 4
Period 50 µs 50 µs Position 0 s Slope Positive
Delay 0 s 0s Acquisition Equiv. Time Trigger Level -300 mV
Duty cycle 50% 50% Channel 1 200 mV/div, 50 Ω
Offset 500 mV
Average 4
High 1 V Channel 2 200 mV/div, 50 Ω
Offset 500 mV
Graticule Grid
Low 0 V Channel 3 OFF
Offset 0.5 V Channel 4 200 mV/div, 50 Ω
Offset -350 mV
Output CH1 Enabled
Output CH1 Disabled
Output CH2 Enabled
Output CH2 Disabled

15
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Determine probe pass/fail criteria
Determine probe pass/fail criteria
The 1155A Probe is specified to have a rise time of ≤470 ps. The combined rise
time of the total system (8131A, 1155A, and 54845A) is approximately 539 ps
worst case.
To determine if the probe itself meets the specification of ≤470 ps, it is necessary
to account for the test system rise time (8131A and 54845A) and to relate this
to the total system rise time. The following graph allows you to relate these
two times and to determine that the probe rise time is less than the worst case
total system rise time. When adjusting the probe, the graph is useful for
understanding when the probe is properly adjusted.
Comparing Test System Rise Time to Total System Rise Time
Example In this example, the rise time of the oscilloscope and the signal generator (test
system) is 263 ps. This allows for the rise time of the probe, signal generator,
and oscilloscope (total system) to be a maximum of 539 ps which corresponds
to a probe rise time of 470 ps.

16
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Set up for probe adjustment
Set up for probe adjustment
1Attach the probe to the setup you made earlier setting up test system
as indicated below.
Equipment Setup with 1155A Active Probe Attached
2Remove the 50 Ωcables from channel 1 and channel 2 of the
oscilloscope.
3Add 50 Ωterminations to both cables using BNC to BNC barrels as
indicated above.

17
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Adjusting the probe
4Connect BNC to probe tip adapter to the terminations and connect the
1155A probes.
5Remove the 4 screws of the probe housing using the T10 torx driver.
Adjusting the probe
1Change the oscilloscope settings as follows:
• Time/div to 5 ms/div
• 8131A Signal Generator period to 50 ms (both channels)
2If you installed a new board or cable assembly, set all the adjustments
(except COMP) to the clockwise position. If you are tweaking the
adjustments, you can set them to the clockwise position or leave them
where they were last set. If only replacing cables, do not preset
adjustments fully clockwise.
3Connect ChA (large pod) to channel 1 of the oscilloscope; message
displayed should read 10:1.
Connect ChB (small pod) to channel 2 of the oscilloscope; message
displayed should read 10:1.
4Adjust GAIN for a flat pulse on both probes.
If you turn on the DeltaV marker, you can use it as a reference for a flat line.
5Change the signal generator to a 50-µs period and change the scope to
5µs/div.
6Adjust COMP for a flat pulse.
Again, you can use the DeltaV marker as a reference for a flat line.
GAIN
01145w01
Channel A
Channel B
CO
MP
01145w02

18
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Adjusting the probe
7Change the scope to 1 ns/div. Adjust the oscilloscope’s position to place
the leading edge two major divisions from the left-hand side of the
oscilloscope.
8Drag and drop the rise time icon to the channel 1 display. Then pull the
rise time icon to the channel 2 display.
9Drag and drop the overshoot icon to the channel 1 display. Then pull
the overshoot icon to the channel 2 display.
10 Adjust RA for a flat pulse top. RA, RB, and DAMP are mutually
dependent.
11 Adjust RB for a linear rising edge. RA, RB, and DAMP are mutually
dependent.
The following steps require iteration of RA, RB, and DAMP adjustments to achieve
the best result.
R
A
01145w03
RB
01145w04

19
1155A 2-Channel, Low-Mass Active Oscilloscope Probe
Adjusting the probe
12 Adjust DAMP for about 6% overshoot. RA, RB, and DAMP are mutually
dependent.
13 Repeat steps 10 through 12 to achieve the best pulse.
14 Temporarily place the cover on top of the probe body, then measure the
pulse rise time.
You may need to remove the cover and make minor adjustments to RA, RB, and
DAMP to meet specifications.
15 Repeat steps 10 through 12 for the other channel if the measured rise
time is greater than the worst case total system rise time
16 Record ChA total rise time ____________.
Record ChB total rise time ____________.
This is the rise time of the probe and test system (total rise time.)
17 Calculate the probe rise time using the following equation:
18 Note:
Channel A Proberisetime = ___________.
Channel B Proberisetime = ___________.
19 Install the cover and verify that both probes still meet the rise time
specification.
The result should be about 6 to 10% overshoot, and the rise time should be less
than the rise time you determined in step 16.
20 Disconnect the probe tips from the 8131A signal generator.
21 Perform the probe tip calibration for ChA and ChB.
22 Look at the probe attenuation in the probe setup dialog box of the
54845A oscilloscope. The attenuation for Ch1 and Ch2 should be less
than 10.4 or greater than 9.6. This allows 1% for the oscilloscope and
3% for the 1155A probe.
D
A
MP
01145w05
Proberisetime Totalrisetime ()
2TestSystemrisetime
()
2
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