User’s Guide
Publication number 01152-97002
January 2000
For Safety information, Warranties, and Regulatory information, see the pages
at the back of this guide.
© Copyright Agilent Technologies 1997-2000
All Rights Reserved.
1152A 2.5-GHz Active Probe
1152A 2.5-GHz Active Probe
The 1152A 2.5-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. See chapter 1 for full specifications and characteristics.
• A bandwidth of 2.5 GHz
• Input resistance of 100 kΩ
• Input capacitance of approximately 0.6 pF
• Dynamic range of ±5 V dc + peak ac
• Variable dc offset of ±20 V
• Excellent immunity to ESD and over-voltages
• Probe-tip ground connection not necessary for "browsing"
Accessories Supplied
The following accessories are supplied. See "Accessories supplied" in chapter 1
for a complete list.
• "Walking-stick" ground
• Box of small accessories
• Carrying case
Accessories Available
The following accessories can be ordered.
• 11880A Type N(m) to probe tip adapter and 50-Ω termination
• 10218A BNC(m) to probe tip adapter
• 10229A Hook tip adapter
ii
In This Book
This guide provides user and service inform ati on for the 1152A 2.5-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.
Chapter 3 gives you information about some important aspects of probing and
how to get the best results with your probe.
Chapter 4 provides service information.
iii
iv
Contents
1 General Information
To inspect the probe 1-3
To clean the probe 1-3
Accessories supplied 1-5
Probe operating range 1-6
Performance Specifications 1-8
Characteristics 1-9
General Characteristics 1-10
2 Operating the Probe
Probe handling considerations 2-2
To bias the probe 2-3
To connect the probe 2-3
System bandwidth 2-4
Using probe accessories 2-5
Additional accessories 2-9
3 Probing Considerations
Resistive Loading Effects 3-3
Capacitive Loading Effects 3-5
Ground Inductance Effects 3-7
Probe Bandwidth 3-11
Conclusion 3-12
4Service
Service Strategy 4-2
To return the probe to Agilent Technologies for service 4-3
Troubleshooting 4-4
Failure Symptoms 4-4
Contents-1
Contents-2
1
General Information
Introduction
This chapter covers the following information:
• Inspection
• Cleaning
• Accessories supplied
• Probe operating range
• Performance specifications
• Performance characteristics
• General characteristics
1- 2
General Information
To inspect the probe
To 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 instrument has
been checked mechanically and electrically.
❏ Check the accessories.
Accessories supplied with the instrument are listed in "Accessories Supplied"
in table 1-1 later in this chapter.
• 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 instrument does not
operate properly or pass performance 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.
To clean the probe
If this probe requires cleaning, disconnect it from the oscilloscope and clean it
with a mild detergent and water. Make sure the instrument is completely dry
before reconnecting it to the oscilloscope.
1-3
Figure 1-1
General Information
To clean the probe
Walking-stick
ground
(supplied)
Included with the probe
is a box of small
accessories. See table
Accessories
1-1,
Supplied
chapter for a complete
list of accessories.
later in the
152A Active Probe
1- 4
Figure 1-2
General Information
Accessories supplied
Accessories supplied
The following figure and table illustrate the accessories supplied with the 1152A
Active Probe.
5
Table 1-1
2 3 4
6
1
7
8
9 10 11
Accessories Supplied
Item Description Qty Agilent Part
1 Walking-stick ground 1 5960-2491
2 Single-contact socket 5 1 251-5185
3 Standard probe re placement tip 5 5 4701-26101
4 Sharp probe tip 2 5 081-7734
5 200-Ω signal lead 1 54701-81301
6 2-inch groun d extensi on lead, attac hable to walk ing-sti ck
ground
7 4-inch al ligator ground lead, attac hable to probe t ip ground1 01123-61302
8 Nut Driver 3/32-in 1 8710-1806
9 Flexible Probe Adapter 1 54701-63201
10 Probe Socket 1 5041-9466
11 Coaxial Socket 3 1250-2428
Number
1 0 1650-82103
1-5
Figure 1-3
General Information
Probe operating range
Probe operating range
Figure 1-3 shows the maximum input voltage for the active probe as a function
!
of frequency. This is the maximum input voltage that can be applied without
risking damage to the probe.
Maximum Input Voltage vs Frequency
Figure 1-4
Figure 1-4 shows the operating range of the probe. For the most accurate
measurements and safety for the probe, signals should be within the indicated
operating region.
Area of optimum
operation
Probe Operating Range
1- 6
Figure 1-5
General Information
Probe operating range
The curves in Figure 1-5 and Figure 1-6 represent the typical input signal limits
for several levels of second and third harmonic distortion in the output signal.
For input signals below a given curve, the level of harmonic distortion in the
output is equal to or below that represented by the curve. The dashed straight
line in each figure represents the operating range limit as shown in Figure 1-4
on the previous page.
Second harmonic
≤-20 dBc
Second harmonic
≤-30 dBc
Second harmonic
≤-40 dBc
Figure 1-6
Second Harmonic Distortion, Input Voltage vs Frequency
Third harmonic
≤-40 dBc
Third Harmonic Distortion, Input Voltage vs Frequency
1-7
General Information
Performance Specifications
Performance Specifications
Table 1-2 gives performance specifications for the active probe.
Table 1-2
Table 1–2 Performance Specifications
Bandwidth (–3dB) >2.5 GHz
Attenuation Factor 10:1
dc Input Resistance 100 kΩ ±1%
dc Gain Accuracy ±0.5% with 50Ω ±0.5Ω load
1- 8
Characteristics
The following characteristics are typical for the active probe.
General Information
Characteristics
Table 1-3
Characteristics
System bandwith
with 54845A and 54835A 1.3 GHz
with 54810A/15A/20A/25A 500 MHz
Rise time (10% to 90%) <140 ps calculat ed from
Input Capacitance 0.6 pF (typical)
Flatness
<3 ns from rising edge ±6% with input edge ≥170 ps
≥3 ns from rising edge ±1% with input edge ≥170 ps
Dynamic Range
(<1.5% gain compression)
dc Offset Accuracy ±1% of offset ±1 mV
Offset Adjustment Range ±20 V at the probe tip
Offset Gain 4.6 V/mA
RMS Output Noise
(dc to 2.5 GHz, input loaded in 50 Ω)
Propagation Delay 7.5 ns (approxi ma tel y)
!
Maximum Input Voltage
ESD Tolerance
1
This is not the voltage measurement range. See Dynamic Range characteristic
1
±5 V dc + peak ac
<300 µV
±40 V [dc + peak ac(<20 MHz)], CAT I
(150 Ω/150 pF)
for measurement range.
tr = (0.35/Bandwidth)
1-9
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