Agilent Technologies 85901A Operation manual

Operation and Service Manual
Agilent Technologies 85901A
AC Power Source
This manual applies directly to
Agilent 85901A AC Power Sources with
serial numbers prefixed 2838K and below.
Manual Part Number: 85901-90001
Supersedes September 1988
Microfiche Part Number: 85901-90004
Printed in USA
April 2000
© Copyright 1988-2000 Agilent Technologies, Inc.

ii
The information contained in this document is subject to change
without notice.
Agilent Technologies makes no warranty of any kind with regard to this
material, including but not limited to, the implied warranties of
merchantability and fitness for a particular purpose. Agilent
Technologies shall not be liable for errors contained herein or for
incidental or consequential damages in connection with the furnishing,
performance, or use of this material.
The following safety symbols are used throughout this manual.
Familiarize yourself with the symbols and their meaning before
operating this instrument.
WARNING Warning denotes a hazard. It calls attention to a procedure
which, if not correctly performed or adhered to, could result in
injury or loss of life. Do not proceed beyond a warning note
until the indicated conditions are fully understood and met.
CAUTION Caution denotes a hazard. It calls attention to a procedure that, if not
correctly performed or adhered to, could result in damage to or
destruction of the instrument. Do not proceed beyond a caution sign
until the indicated conditions are fully understood and met.
NOTE Agilent Technologies certifies that this product met its published
specifications at the time of shipment from the factory. Agilent further
certifies that its calibration measurements are traceable to the United
States National Bureau of Standards, to the extent allowed by the
Bureau’s calibration facility, and to the calibration facility of other
International Standards Organization members.
WARNING Before the charger of the 85901A is switched on, make sure it
has been properly grounded through the protective conductor
of the ac power cable to a socket outlet provided with the
protective earth contact. Any interruption of the protective
(grounding) conductor inside or outside the instrument, or
disconnection of the protective earth terminal, can result in
personal injury.
WARNING There are voltages at many points in the instrument which can,
if contacted, cause personal injury. Be extremely careful. Any
adjustments or service procedures that require operation of the
instrument with the protected covers removed should be
performed only by trained service personnel.

iii
WARNING ALWAYS assume that high voltage is present at the inverter
output and on the power cord adapters. NEVER rely on the
position of the inverter switch or charger switch or on the
front-panel LED indicators to determine if high voltage is
present. Never use a damaged power cord adapter. The inverter
output should be treated as cautiously as you would treat a line
voltage source.
WARNING When the high voltage output of the inverter is exposed, for
example when the 85901A is used in servicing some other
instrument, take extreme safety precautions as you would for
any high voltage exposure. ALWAYS disconnect all inverter
power cords before servicing the load unit. NEVER rely on the
position of the inverter switch or charger switch or on the
front-panel LED indicators to determine if high voltage is
present.
CAUTION Before an instrument is connected to the 85901A, verify that the line
voltage selector of the instrument to be connected is set to the same
voltage as the 85901A inverter output voltage. Failure to set the ac
power input to the correct voltage could cause damage to the
instrument.
Regulatory Notices
Herstellerbescheinigung
Hiermit wird bescheinigt, daβdas Gerät/System 85901A in
Übereinstimmung mit den Bestimmungen von Postverfügung 1046/84
funkentstört ist.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses
Gerätes/Systems angezeigt und die Berechtigung Überprüfung der
Serie auf Einhaltung der Bestimmungen eingeräumt.
Zusaatzinformation fur Meβ-und Testgeräte
Werden Meβ- und Testgeräte mit ungeschirmten Kabeln und/oder in
offenen Meβaufbauten verwendet, so ist vom Betreiber sicherzustellen,
daβdie Funk-Entstörbestimmungen unter Betriebsbedingungen an
seiner Grundstücksgrenze eingehalten werden.

iv
Manufacturer’s Declaration
This is to certify that the equipment 85901A is in accordance with the
Radio Interference Requirements of Directive FTZ 1046/84. The
German Bundespost was notified that this equipment was put into
circulation, the right to check the series for compliance with the
requirements was granted.
Additional Information for Test- and Measurement Equipment
If Test- and Measurement Equipment is operated with unscreened
cables and/or used for measurements on open set-ups, the user has to
assure that under operating conditions the Radio Interference Limits
are still met at the border of his premises.
Warranty
This Agilent Technologies instrument product is warranted against
defects in material and workmanship for a period of one year from date
of shipment. During the warranty period, Agilent Technologies will, at
its option, either repair or replace products which prove to be defective.
For warranty service or repair, this product must be returned to a
service facility designated by Agilent Technologies. Buyer shall prepay
shipping charges to Agilent Technologies and Agilent Technologies
shall pay shipping charges to return the product to Buyer. However,
Buyer shall pay all shipping charges, duties, and taxes for products
returned to Agilent Technologies from another country.
Agilent Technologies warrants that its software and firmware
designated by Agilent Technologies for use with an instrument will
execute its programming instructions when properly installed on that
instrument. Agilent Technologies does not warrant that the operation
of the instrument, or software, or firmware will be uninterrupted or
error-free.

v
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from
improper or inadequate maintenance by Buyer, Buyer-supplied
software or interfacing, unauthorized modification or misuse, operation
outside of the environmental specifications for the product, or improper
site preparation or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED.
AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND
EXCLUSIVE REMEDIES. AGILENT TECHNOLOGIES SHALL NOT
BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON
CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

vi

Contents
7
1. General Information
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Instruments Covered by This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
2. Installation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Preparation for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
Inverter Line Voltage and Fuse Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
Connecting Internal Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Connecting External Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
Power Cable for Charger Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
Power Cable for Inverter Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
Operating Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Storage and Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
Environmental. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
Packaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
3. Operation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Front-Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Rear-Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Charging the Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Basic Operation Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Charger Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Inverter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
4. Performance Tests
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Performance Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
1. Inverter Output Voltage and LED Annunciators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
2. Inverter DC Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
3. Inverter Internal DC Input Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
4. Inverter Shutoff with Charger On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
5. Adjustments
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Pre-Adjustment Set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Reference Voltage Adjustment: A2R14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

8
Contents
Charger Output Voltage Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
After Completing All Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
6. Replaceable Parts
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
7. Service
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Overall Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Front-Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Rear-Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
DC-to-DC Converter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
Inverter Circuit Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
DC-to-AC Switcher. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
Charger Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Charger Block Diagram Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
Flyback Control Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Power-Limited Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
Shut-Off Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
Control Circuit Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Control Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
Status-Sensing Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
Shut-Off Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Buzzer and Indicator Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17
Bias Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18

1-1
1General Information

1-2 Chapter 1
General Information
Introduction
Introduction
This manual contains information required to operate and service the
Agilent Technologies Model 85901A AC Power Source. The 85901A is
shown in Figure 1-1 with all of its externally supplied accessories.
Description
The 85901A is a portable ac power source. It can be operated on the
bench or as a portable power supply for field service. Other uses are for
measurements requiring power line isolation or for measurements
performed during power failure. The instrument has a carrying handle
that can also be used as an adjustable tilt-stand. The handle can be
moved by pushing the sides of the handle in and then turning the
handle to a suitable position.
The 85901A consists of battery, inverter, charger, and control circuits. It
provides up to 200W maximum continuous power with the internal
battery, at either 115 Vrms or 230 Vrms.
The 85901A weighs 14.2 kg (31.3 lbs) with the battery installed, and 8.0
kg (17.6 lbs) without the battery. The rear panel has terminals for
connecting an external battery or other 12 Vdc source. The dimensions
of the package are 337 mm wide by 125 mm high by 461 mm deep.
Specifications
Instrument specifications are listed in Table 1-1. These specifications
are the performance standards or limits against which the instrument
may be tested.
Performance characteristics are listed in Table 1-2. Characteristics
provide useful information by describing typical, non-warranted
instrument performance.

Chapter 1 1-3
General Information
Specifications
Figure 1-1 85901A w/Complete Set of General Purpose Power-Cord
Adapters

1-4 Chapter 1
General Information
Safety Considerations
Safety Considerations
The 85901A AC Power Source has been designed to conform to the
safety requirements of an IEC (International Electromechanical
Committee) Safety Class I instrument, and is shipped from the factory
in a safe condition. This Agilent Technologies 85901A A C Power Source
Operation and Service Manual, and all related documentation, must be
reviewed for familiarization with safety markings and instructions
before operation. This unit is to be used in a controlled environment.
WARNING This unit contains more than one live circuit. See the schematic
diagrams.
This operation and service manual contains safety information,
cautions, and warnings which must be followed by the user to ensure
safe operation and to maintain the instrument in a safe condition.
Instruments Covered by This Manual
This instrument has a two-part serial number in the form of
00000K00000 (see Figure 1-2). The number is stamped on the serial
plate attached to the rear panel of the instrument. The first five digits
and the letter constitute the serial prefix; the last five digits form the
digits. The prefix is the same for all identical instruments, and it
changes only when a change is made to the instrument. The suffix,
however, is assigned sequentially and is different for each instrument.
The contents of this manual apply directly to instruments having the
same serial number prefix(es) listed under "Serial Numbers” on the
title page. The letter placed between the two sets of digits identifies the
country where the instrument was manufactured.

Chapter 1 1-5
General Information
Instruments Covered by This Manual
Figure 1-2 Typical Serial Number Label
An instrument manufactured after the printing of this manual may
have a serial number prefix that is not listed on the title page. This
unlisted serial number prefix indicates that the instrument is different
from those described in the manual.
The manual for a newer instrument is accompanied by a Manual
Updating Supplement, which contains the change information that
explains how to adapt the manual to the newer instrument.
In addition to change information, the supplement may contain
information for correcting errors in the manual. To keep this manual as
current and accurate as possible, Agilent recommends that you
periodically request Manual Updating Supplement. The supplements
are identified with the manual print date and part number, both of
which appear on the manual title page. For information concerning a
serial number prefix that is not listed on the title page or in the Manual
Updating Supplement, contact your nearest Agilent office.

1-6 Chapter 1
General Information
Instruments Covered by This Manual
Table 1-1 85901A Specifications
Specifications describe warranted performance over the temperature
range of 0°C to 55°C after one hour continuous operation, unless
otherwise noted.
INPUTS
Inverter1
Voltage 10.8 Vdc to 14.5 Vdc
Charger2
Voltage 90 to 250 Vac, auto-selected
Frequency 44 to 66 Hz
Power consumption 122 VA, maximum
1. The inverter input must not have any transients higher than 14.5 V.
Otherwise, the overvoltage protection circuit will automatically turn
the inverter off.
2. Turning the charger on automatically turns the inverter off.
OUTPUTS
Inverter
Voltage 135 or 270 V peak 5%
Rectangular waveform with 25%
dead zone (115 or 230 Vrms 5%)
Frequency 60 Hz 0.1%, crystal reference
Maximum power 200W, continuous

Chapter 1 1-7
General Information
Instruments Covered by This Manual
Table 1-2 85901A Characteristics (1 of 2)
ENVIRONMENTAL
Temperature1
1. Shelf life of battery decreases with either extended operation or storage at
higher than 40C
Operating 0°C to +55°C
Storage: with battery –20°C to +40°C
without battery –40°C to +70°C
EMI
Conducted emission FTZ 1046
Radiated emission FTZ 1046
Battery23
2. Battery cyclic life (charge-discharge) is nominally rated at more
than 200 cycles.
3. Battery is a Matsushita Electric LCR12V17P sealed lead acid. Bat-
tery is available from Agilent Technologies as HP/Agilent p/n
1420-0373.
Type Sealed lead acid
Voltage 12Vdc
Capacity 17 ampere-hours
MECHANICAL
Dimensions: width 337mm (13.3 in)
height 125 mm (4.9 in)
depth 461 mm 18.1 in)
Weight: with battery 14.2 kg (31.3 lb)
without battery 8.0 kg (17.7 lb)
Shipping weight 16.3 kg (36.0 lb)
BATTERY SHELF LIFE
Storage Temperature Recharge Interval
<20°C 18 months
20°C to 30°C12 months
0°C to 40°C 6 months
CERTIFICATION
The 85901A is certified for use with the following Agilent test and
measurement equipment:
HP/Agilent 8562A/B, Agilent 8590A, and Agilent 8592A, and their
options.

1-8 Chapter 1
General Information
Instruments Covered by This Manual
Figure 1-3 85901A Characteristics (2 of 2)
Table 1-3 Recommended Test Equipment
Instrument Critical Specifications Recommended
Model Where Used
Perf.
Tests Adj. Ser- vice
Power Supply Output voltage: 9 to 20 Vdc HP/Agilent 6032A √√
Digital
Multimeter 4.5 digits display HP/Agilent 3487A √√√
Electronic Load Input voltage: 20 Vdc
Input current: 10A minimum Fujitsu EUL-300D √√

2-1
2Installation

2-2 Chapter 2
Installation
Introduction
Introduction
This chapter provides the information needed to install the 85901A
AC Power Source. Topics covered include: initial inspection, line voltage
and fuse selection, operating environment, battery charging, battery
replacement, storage, and shipment.
Initial Inspection
The 85901A AC Power Source, as shipped from the factory, meets all
the specifications listed in Table 1-1.
Inspect the shipping container for damage. If the shipping container or
cushioning material is damaged, notify the carrier as well as the
Agilent office and be sure to keep the shipping materials for the
carrier's inspection until the contents of the shipment have been
checked for completeness and the instrument has been checked
mechanically and electrically.
Complete shipment contents are shown in Figure 2-1. A test procedure
for checking general electrical operation may be found under "Basic
Operation Check" in Chapter 3. Performance tests to check the 85901A
against its specifications are given in Chapter 4. If the instrument does
not pass the performance tests, notify the nearest Agilent office (or, to
obtain the address of the Agilent office nearest you, contact an office
listed on the inside rear cover of this manual). The office will arrange
for repair or replacement without waiting for a claim settlement.
CAUTION Before using the 85901A for the first time, the internal battery should
be charged. Follow the procedure for charging the battery in Chapter 3.
If the shipping materials are in good condition, retain them for possible
future use. You may wish to ship the instrument to another location or
return it to Agilent for service.

Chapter 2 2-3
Installation
Initial Inspection
Figure 2-1 85901A Shipping Container and Contents

2-4 Chapter 2
Installation
Preparation for Use
Preparation for Use
Power Requirements
The inverter of the 85901A requires a power source of 10.8 Vdc to 14.5
Vdc. Power consumption is approximately 330W when the 85901A
provides its maximum continuous output capacity of 200W.
WARNING If the instrument is to be energized via an external
autotransformer for voltage reduction, make sure the common
terminal is connected to the neutral pole of the charger input.
CAUTION Before turning the 85901A charger switch on, verify that the line
voltage is within the charger input's voltage range.
The charger circuit of the 85901A requires a power source of 90 to 250
Vac, 47 to 66 Hz, single-phase. You do not need to select the correct
input voltage; the charger circuit automatically does so. Maximum
power consumption in the charging mode is approximately 122 VA.
Inverter Line Voltage and Fuse Selection
CAUTION Before turning the 85901A inverter switch on, verify that the connected
instrument's line voltage selection is set to the same voltage as the
85901A inverter output voltage.
The 85901A voltage selection switch selects the output voltage of the
inverter (115V or 230V).
The appropriate fuses are factory-installed for the instrument's
destination. Figure 2-2 illustrates replacement fuses, and Table 2-1
lists their ratings and part numbers.
CAUTION Before using the 85901A, check that the proper fuse for your line
voltage and selected inverter-output voltage is installed.