Agilent Technologies 1142A User manual

Agilent Technologies
Agilent 1142A
Probe Control and
Power Module
User’s Guide

Notices
© Agilent Technologies, Inc. 2000 – 2014
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States and international copyright laws.
Manual Part Number
01142-97003
Edition
August 2014
Printed in Malaysia
Agilent Technologies, Inc.
1601 California Street
Palo Alto, CA 94304, USA
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Safety Notices
CAUTION. A CAUTION notice
denotes a hazard. It calls attention to
an operating procedure, practice, or the
like that, if not correctly performed or
adhered to, could result in damage to
the product or loss of important data.
Do not proceed beyond a CAUTION
notice until the indicated conditions
are fully understood and met.
WARNING. A WARNING notice
denotes a hazard. It calls attention to
an operating procedure, practice, or
the like that, if not correctly per-
formed or adhered to, could result in
personal injury or death. Do not pro-
ceed beyond a WARNING notice until
the indicated conditions are fully
understood and met.
2 N2779A User’s Guide

3
1142A Probe Control and Power Module
1142A Probe Control and
Power Module
Using the 1142A 5
Safety Information 8
Performance Test 11
Specifications and Characteristics 13
Service 15
Replaceable Parts 19
Contacting Agilent 32
The 1142A supplies two sets of positive and negative
voltages for use by active probes. For the 1141A probe it
also supplies an offset current. Refer to the 1141A
Differential Probe and 1142A Probe Control and Power
Module User and Service Guide for more information.
Figure 1 1142A Probe Control and Power Module

4
1142A Probe Control and Power Module
Before connecting your Agilent probe to the 1142A, refer to the
probe’s user’s guide to learn how to perform measurements. This
manual contains information for use and service of the 1142A by
itself. It covers use of the 1142A as a power supply only and
service of the instrument in general. Use of the offset controls is
covered in the probe or oscilloscope manual.
Parts Supplied The following items are supplied with the 1142A.
■One power cord
■One operating and service guide
Accessories Available A fan- out adapter is available to power two probes with one
supply.
■Fan- out adapter, part number 01144- 61604
Instruments Covered by
Manual
The 1142A’s rear- panel serial number sticker is in the form:
0000A00000. The first four digits and letter are the serial prefix,
while the last five digits are the suffix. The prefix is the same for
all identical instruments, and it changes only when a change has
been made to the instrument. The suffix however, is assigned
sequentially and is different for each instrument. The contents of
this manual apply to instruments with the serial number prefixes
3050A.

1142A Probe Control and Power Module
Using the 1142A
5
Using the 1142A
This section of the manual contains information and
instructions for installation and use of the 1142A Probe
Control and Power Module as an auxiliary power supply. Use
of probe controls is covered in the guide for the probe.
Initial Inspection
1Inspect 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.
2Check the accessories. If the contents are incomplete or
damaged notify your Agilent Technologies Sales Office.
3Inspect the instrument.
aIf there is mechanical damage or defect, or if the
instrument does not operate properly or pass performance
tests, notify your Agilent Technologies Sales Office.
bIf 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.

6
1142A Probe Control and Power Module
Using the 1142A
Checking the Power
Requirements and Fuse
The power module requires a power source of either 115 Vac
or 230 Vac, 47 to 440 Hz, 25VA maximum.
CAUTION BEFORE CONNECTING POIWER TO THIS INSTRUMENT, be
sure the line voltage select switch on the instrument’s rear
panel is set properly. Applying a voltage excessive to the setting
may open the protective fuse.
The rear- panel fuse (F1) is a 0.25A, 250V time- delay fuse.
The fuse used is the same regardless of line voltage
selection. To replace the fuse:
1Locate the fuse holder shown in Figure 2. Gently push the
fuse holder in using your finger or a flat- bladed screwdriver.
2While the fuse holder is pushed in, gently turn the fuse
holder counterclockwise.
Figure 2 1142A Rear Panel

1142A Probe Control and Power Module
Using the 1142A
7
WARNING SHOCK HAZARD!BEFORE YOU CONNECT THIS INSTRUMENT TO MAINS
POWER OR LIVE MEASURING CIRCUITS you must provide a protective
earth ground. The Mains plug must be inserted in a socket outlet
provided with a protective earth contact. Do not use an extension cord
(power cable) without a protective conductor (grounding). Grounding
one conductor of a two-conductor outlet does not provide an instrument
ground. Failure to provide a protective earth ground could result in a
shock hazard if there is a failure in this instrument or equipment
connected to it.
The 1142A is provided with a three- wire power cable. When
connected to an appropriate ac power outlet, this cable grounds the
instrument cabinet. The type of power cable plug shipped with the
instrument depends on the country of destination.
The 1142A has no power switch. It is not required because of the
low mains power requirement.
To Clean the Instrument If the 1142A requires cleaning, perform the following steps:
1Remove power from the instrument.
2Clean the external surfaces of the instrument with a soft,
dry cloth. Make sure that the instrument is completely dry
before reconnecting it to a power source.

8
1142A Probe Control and Power Module
Safety Information
Safety Information
The following general safety precautions must be observed during
all phases of operation of this instrument. Failure to comply with
these precautions or with specific warnings or operating
instructions in the product manuals violates safety standards of
design, manufacture, and intended use of the instrument. Agilent
Technologies assumes no liability for the customer's failure to
comply with these requirements.
Table 1 Instrument Markings
Marking Description
Instruction manual symbol: the product is marked with this symbol when it is necessary for you to
refer to the instruction manual in order to protect against damage to the product. "Caution" or
"Warning" risk of danger marked on product. Refer to “Safety Information” on page 8.
Hazardous voltage symbol.
Earth terminal symbol. Used to indicate a circuit common connected to grounded chassis.
Indicates AC (Alternating Current).
The CE mark of the European Community.
The CSA mark.
This symbol indicates the Environmental Protection Use Period (EPUP) for the product’s toxic
substances for the China RoHS requirements.
This product complies with the WEEE Directive marking requirements.

1142A Probe Control and Power Module
Safety Information
9
General Do not use this product in any manner not specified by the
manufacturer. The protective features of this product may be
impaired if it is used in a manner not specified in the operation
instructions.
WARNING Only fuses with the required rated current, voltage, and specified type
(normal blow, time delay, etc.) should be used. Do not use repaired fuses
or short-circuited fuseholders. To do so could cause a shock or fire
hazard.
This apparatus has been designed and tested in accordance with
IEC Publication 348, Safety Requirements for Measuring Apparatus,
and has been supplied in a safe condition. This is a Safety Class I
instrument (provided with terminal for protective earthing). Before
applying power, verify that the correct safety precautions are taken
as described in the following warnings. In addition, note the
external markings on the instrument as described in Table 1 on
page 8.
WARNING If the instrument is damaged, or if it fails to operate according to the
characteristics in this manual, remove the power cord and contact
Agilent Technologies.
WARNING Before turning on the instrument, you must connect the protective earth
terminal of the instrument to the protective conductor of the (mains)
power cord. The mains plug shall only be inserted in a socket outlet
provided with a protective earth contact. You must not negate the
protective action by using an extension cord (power cable) without a
protective conductor (grounding). Grounding one conductor of a
two-conductor outlet is not sufficient protection.
WARNING If you energize this instrument by an auto transformer (for voltage
reduction or mains isolation), the common terminal must be connected
to the earth terminal of the power source.
WARNING Whenever it is likely that the ground protection is impaired, you must
make the instrument inoperative and secure it against any unintended
operation.

10
1142A Probe Control and Power Module
Safety Information
WARNING Service instructions are for trained service personnel. To avoid
dangerous electric shock, do not perform any service unless qualified to
do so. Do not attempt internal service or adjustment unless another
person, capable of rendering first aid and resuscitation, is present.
WARNING Do not install substitute parts or perform any unauthorized modification
to the instrument.
WARNING Capacitors inside the instrument may retain a charge even if the
instrument is disconnected from its source of supply.
WARNING Do not operate the instrument in the presence of flammable gases or
fumes. Operation of any electrical instrument in such an environment
constitutes a definite safety hazard.
WARNING When unplugging the power cord from the power receptacle or from the
unit, grasp the plug, not the cord, in order to avoid damaging the cable.