Agilent Technologies 1145A Manual

User and Service Guide
Publication number 01145-92005
May 2014
For Safety, Regulatory, and publishing information, see the pages at the back of
this book.
© Copyright Agilent Technologies Company 2000-2014
All Rights Reserved.
1145A 2-Channel Active Probe

2
Contents
Specifications 4
Characteristics 4
General Characteristics 5
Operating the Probe 6
Probe Power Connection 8
Cleaning the Probe 8
Service Strategy 8
Adjustments 11
Calibration Testing Procedures 15

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The 1145A 2-Channel Active Probe
The 1145 2-Channel Active Probe is a 10:1 probe with a 750 MHz bandwidth.
The FET amplifier allows a high input resistance and low input capacitance which
minimizes the loading of the circuit under test. The output impedance of the
probe is 50 Ω, which allows the probe cable to be extended with a 50-Ωcoaxial
cable.
The probe can be powered by the probe power outputs of the 54520 and 54540
series oscilloscopes. To use the probe with other instruments, you can use the
1142A power supply.
Accessories Supplied
.
Accessories Available
You can order the following accessories from Agilent Technologies.
• E.F. Johnson socket adapter, Agilent Technologies part number 01145-63201
• Calibration kit, Agilent Technologies part number 01145-68701
1Probe pin, quantity supplied 4, kit #16517-82107
2SMT grabber, quantity supplied 5, kit #16517-82109
3Ground lead pin-socket, quantity supplied 2, kit #16517-82106
4Ground extender, quantity supplied 2, kit #16517-82105
5SMT leads, quantity supplied 2 red and 2 black, kit #16517-82104
You can order additional quantities of the above parts, see page 8 for ordering
information

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1145A 2-Channel Active Probe
Specifications
Specifications
Bandwidth 1≥750 MHz
Rise Time 1,2 ≤470 ps
Attenuation 310:1 ±3%
Input Resistance 1 MΩ, ±2%
Maximum Input Voltage ±40 V (dc + peak ac)
1. Above 35 °C, bandwidth and risetime degrade approximately 1/2%/°C
2. Rise time figure calculated from tr = 0.35/Bandwidth.
3. When connected to an instrument input of 50 Ω, ±0.5%
Characteristics
Input Capacitance 2 pF (typical)
Overshoot and Ringing 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 50Ω
!

5
1145A 2-Channel Active Probe
General Characteristics
General Characteristics
1145A Dimensions
Environmental
Conditions
Operating Non-operating
Temperature 0 C to +55 °C (32 °F to
+131 °F)
-40 °C to +70 °C (-40 °F to +158 °F)
Humidity up to 95% relative humidity
(non- condensing) at +40 °C
(+104 °F)
up to 90% relative humidity at +65°C
(+149 °F)
Altitude up to 4,600 meters
(15,000 ft)
up to 15,300 meters
(50,000 ft)
Vibration Random vibration 5 to 500
Hz, 10 minutes per axis,
0.3grms.
Random vibration 5 to 500 Hz, 10 min.
per axis,
2.41 grms. Resonant search 5 to 500 Hz
swept sine, 1octave/min. sweep rate,
(0.75g), 5 min. resonant dwell at 4
resonances per axis.
Power
Requirements
dc ±6 V to ±3% (at approximately 150 mA each supply)
Weight Net: approximately 8 oz.
Shipping: approximately 1 kg (2.2 lb)
Dimensions Refer to the outline drawing below.

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1145A 2-Channel Active Probe
Operating the Probe
Operating the Probe
The following information will help you get the most out of your measurement
when operating the probe.
Typical Input Impedance vs. Frequency
!

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1145A 2-Channel Active Probe
Operating the Probe
Typical System Bandwidth
Typical Rise Time vs. Input Voltage
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 This probe is a delicate device. Dropping it or exposing it to strong vibration
or shock can damage it and cause a malfunction. Please handle it with care.

8
1145A 2-Channel Active Probe
Probe Power Connection
Probe Power Connection
The following drawing shows the input power connections. The power
requirements are given in the General Characteristics.
Cleaning the Probe
Do not use petroleum based solvents to clean the probe. Clean the probe with
a mild soap and water and immediately wipe the probe with a dry cloth.
Service Strategy
If your probe fails during warranty, normal warranty service apply. If the probe
is not under warranty when it fails, you can order any of the following parts from
Agilent Technologies.
Pin 8, -6 V
Pin 3, +6 V
Pin 7, Ground
Shell, Cable Shield
Part Number Description
01145-66501 Loaded Board
01145-61601 Main Cable
01145-60602 Probe tip and cable
16517-82104 SMT lead kit, 4 red and 4 black
16517-82105 Ground extender kit, box of 20
16517-82106 Ground lead pin-socket kit, box of 20
16517-82109 SMT grabber kit, box of 20
16517-82107 Pin probe kit pin, box of 4

9
1145A 2-Channel Active Probe
To replace the main cable
To replace the main cable
Due to the difficulty in soldering the main cable to the printed circuit assembly,
Agilent Technologies recommends that you return the probe to an Agilent
Technologies Service Center if the main cable or printed circuit assembly need
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
1Use a Torx 10 screwdriver to remove the four screws holding the
clamshell pod case together.
2Lift off the tip of the clamshell pod case.
3Use a solder iron to unsolder the center conductor wire of the faulty
probe lead from the bonding pas on the printed circuit assembly.
4Because 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.
5Flow enough solder onto the vacant solder pad for a good solder joint.
6Inter the probe ground legs of the new cable into the circuit board pin
sockets.
7While holding the probe ground legs in place, place the notched strain
relief into the slot of the lower half of the clamshell cover.
8Because 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.
9Inspect the solder joint for good soldering integrity.
10 Check the cable alignments inside of the pod. Replace the top of the
pod, then install the four screws.

10
1145A 2-Channel Active Probe
To return the probe to Agilent Technologies for service
To return 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.
Anti-static 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 instrument by model number and full serial
number.