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.

1145A 2-Channel Active Probe

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

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

1145A 2-Channel Active Probe

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

1145A 2-Channel Active Probe

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.

1145A 2-Channel Active 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

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.

1145A 2-Channel Active Probe

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

1145A 2-Channel Active Probe

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.

1145A 2-Channel Active Probe

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.

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