Fluke 8845A User manual

®
8845A/8846A
Digital Multimeter
Users Manual
July 2006
© 2006 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies.

LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and
service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and
services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance
with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return
authorization information, then send the product to that service center, with a description of the difficulty,
postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following
warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other
provision.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/99
To register your product online, visit register.fluke.com

i
Table of Contents
Chapter Title Page
1 Introduction and Specifications......................................................... 1-1
Introduction........................................................................................................ 1-3
Manual Set ......................................................................................................... 1-3
About this Manual ............................................................................................. 1-4
Safety Information ............................................................................................. 1-4
General Safety Summary............................................................................... 1-4
Symbols ......................................................................................................... 1-6
Instrument Security Procedures ......................................................................... 1-6
Volatile Memory ........................................................................................... 1-6
Non Volatile Memory.................................................................................... 1-6
Media Memory (8846A Only)....................................................................... 1-7
Accessories ........................................................................................................ 1-7
General Specifications ....................................................................................... 1-9
Power............................................................................................................. 1-9
Dimensions.................................................................................................... 1-9
Display........................................................................................................... 1-9
Environment .................................................................................................. 1-9
Safety............................................................................................................. 1-9
EMC .............................................................................................................. 1-9
Triggering...................................................................................................... 1-9
Memory ......................................................................................................... 1-10
Math Functions.............................................................................................. 1-10
Electrical........................................................................................................ 1-10
Remote Interfaces.......................................................................................... 1-10
Warranty........................................................................................................ 1-10
Electrical Specifications .................................................................................... 1-10
DC Voltage Specifications ............................................................................ 1-10
AC Voltage Specifications ............................................................................ 1-11
Resistance...................................................................................................... 1-13
DC Current .................................................................................................... 1-15
AC Current .................................................................................................... 1-16
Frequency ...................................................................................................... 1-18
Capacitance (8846A Only) ............................................................................ 1-19
Temperature (8846A only) ............................................................................ 1-19
Continuity...................................................................................................... 1-19

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Diode Test ..................................................................................................... 1-20
Measurement Rates ....................................................................................... 1-20
2 Preparing the Meter for Operation..................................................... 2-1
Introduction........................................................................................................ 2-3
Unpacking and Inspecting the Meter ................................................................. 2-3
Contacting Fluke................................................................................................ 2-3
Storing and Shipping the Meter ......................................................................... 2-3
Power Considerations ........................................................................................ 2-3
Selecting the Line Voltage ............................................................................ 2-4
Replacing the Fuses....................................................................................... 2-4
Connecting to Line Power ................................................................................. 2-7
Turning Power-On ............................................................................................. 2-8
Adjusting the Bail .............................................................................................. 2-8
Installing the Meter in an Equipment Rack ....................................................... 2-8
Cleaning the Meter............................................................................................. 2-9
3 Front-Panel Operation ........................................................................ 3-1
Introduction........................................................................................................ 3-3
Controls and Indicators...................................................................................... 3-3
Front-Panel Feature Descriptions .................................................................. 3-3
Display Panel................................................................................................. 3-4
Rear-Panel Connectors .................................................................................. 3-6
Adjusting the Meter’s Range......................................................................... 3-7
Navigating the Front-Panel Menu...................................................................... 3-7
Configuring the Meter for a Measurement ........................................................ 3-7
Setting the Display Resolution ...................................................................... 3-7
Setting the AC Signal Filter .......................................................................... 3-8
Setting Continuity Resistance Threshold and Diode Test Parameters .......... 3-8
Setting the Default Temperature Scale (8846A Only) .................................. 3-9
Enabling Automatic Input Impedance........................................................... 3-9
Using the Analyze Functions ............................................................................. 3-9
Collecting Statistics on Measurements.......................................................... 3-10
Testing Using Limits ..................................................................................... 3-11
Setting an Offset Value ................................................................................. 3-12
Using MX+B ................................................................................................. 3-12
Using TrendPlot............................................................................................. 3-13
Using the Histogram Function....................................................................... 3-14
Controlling Trigger Functions ........................................................................... 3-15
Choosing a Trigger Source............................................................................ 3-15
Setting the Trigger Delay .............................................................................. 3-16
Setting the Number of Samples ..................................................................... 3-16
Understanding the Measurement Complete Signal ....................................... 3-17
Accessing and Controlling Memory.............................................................. 3-17
Storing Readings in Memory......................................................................... 3-17
Recalling Readings from Memory ................................................................ 3-18
Storing Meter Configuration Information ..................................................... 3-18
Recalling a Meter Configuration ................................................................... 3-19
Managing Memory ........................................................................................ 3-20
Controlling System-Related Operations ............................................................ 3-21
Identifying Meter Errors................................................................................ 3-21
Querying the Firmware for Revision Level................................................... 3-21
Adjusting Display Brightness........................................................................ 3-21
Setting the Meter’s Date and Time................................................................ 3-21

Contents (continued)
iii
Configuring the Remote Interface ..................................................................... 3-22
Checking the Meter’s Calibration Date ............................................................. 3-22
Resetting the Meter’s Default Settings .............................................................. 3-22
4 Making Measurements........................................................................ 4-1
Introduction........................................................................................................ 4-3
Selecting Function Modifiers............................................................................. 4-3
Activating the Secondary Display ..................................................................... 4-3
Measuring Voltage............................................................................................. 4-4
Measuring DC Voltage.................................................................................. 4-4
Measuring AC Voltage.................................................................................. 4-5
Measuring Frequency and Period ...................................................................... 4-6
Measuring Resistance ........................................................................................ 4-7
Making a Two-Wire Resistance Measurement ............................................. 4-7
Making a Four-Wire Resistance Measurement ............................................. 4-8
Measuring Current ............................................................................................. 4-9
Measuring DC Current .................................................................................. 4-10
Measuring AC Current .................................................................................. 4-11
Measuring Capacitance (8846A only) ............................................................... 4-12
Measuring RTD Temperature (8846A only) ..................................................... 4-13
Testing Continuity ............................................................................................. 4-14
Checking Diodes................................................................................................ 4-14
Making a Triggered Measurement..................................................................... 4-15
Setting the Trigger Mode............................................................................... 4-16
Setting a Trigger Delay ................................................................................. 4-16
Setting Number of Samples per Trigger........................................................ 4-16
Connecting an External Trigger .................................................................... 4-17
Monitoring the Measurement-Complete Signal................................................. 4-17
Appendices
A 2X4 Test Leads............................................................................................ A-1
B Errors........................................................................................................... B-1
C RS-232 Port Connections ............................................................................ C-1
Index

8845A/8846A
Users Manual
iv

v
List of Tables
Table Title Page
1-1. Safety Information ................................................................................................. 1-5
1-2. Safety and Electrical Symbols................................................................................ 1-6
1-3. Volatile Memory Space.......................................................................................... 1-6
1-4. Non-volatile Memory Space .................................................................................. 1-7
1-3. Accessories............................................................................................................. 1-7
2-1. Line Voltage to Fuse Rating................................................................................... 2-5
2-2. Line Power Cord Types Available from Fluke ...................................................... 2-7
3-1. Front-Panel Controls and Connectors .................................................................... 3-3
3-2. Display Elements ................................................................................................... 3-5
3-3. Rear-Panel Conncetors........................................................................................... 3-6
C-1. RS-232 Pin to Signal List....................................................................................... C-1

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Users Manual
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vii
List of Figures
Figure Title Page
2-1. Replacing the Line Fuse......................................................................................... 2-5
2-2. Replacing the Current Input Fuses ......................................................................... 2-6
2-3. Line Power Cords Types Available from Fluke..................................................... 2-7
2-4. Bail Adjustment and Removal ............................................................................... 2-8
3-1. TrendPlot Display .................................................................................................. 3-14
3-2. Histogram Display ................................................................................................. 3-14
4-1. Input Connections for Voltage, Resistance, and Frequency Measurements .......... 4-4
4-2. Input Connections for 4-Wire Resistance Measurements ...................................... 4-8
4-3. Input Connections for 4-wire ohms using 2x4 wire leads...................................... 4-9
4-4. Input Connections for Current Measurements Below 120 mA.............................. 4-10
4-5. Input Connections for Current Measurements Above 120 mA.............................. 4-10
4-6. Measuring Capacitance .......................................................................................... 4-12
4-7. Temperature Measurements ................................................................................... 4-13
4-8. Diode Testing Connections .................................................................................... 4-15
4-9. TRIG I/O Pin-out Description................................................................................ 4-17

8845A/8846A
Users Manual
viii

1-1
Chapter 1
Introduction and Specifications
Title Page
Introduction........................................................................................................1-3
Manual Set .........................................................................................................1-3
About this Manual .............................................................................................1-4
Safety Information .............................................................................................1-4
General Safety Summary...............................................................................1-4
Symbols .........................................................................................................1-6
Instrument Security Procedures .........................................................................1-6
Volatile Memory ...........................................................................................1-6
Non Volatile Memory....................................................................................1-7
Media Memory (8846A Only).......................................................................1-7
Accessories ........................................................................................................1-7
General Specifications .......................................................................................1-9
Power.............................................................................................................1-9
Dimensions....................................................................................................1-9
Display...........................................................................................................1-9
Environment ..................................................................................................1-9
Safety.............................................................................................................1-9
EMC ..............................................................................................................1-9
Triggering......................................................................................................1-9
Memory .........................................................................................................1-10
Math Functions..............................................................................................1-10
Electrical........................................................................................................1-10
Remote Interfaces..........................................................................................1-10
Warranty........................................................................................................1-10
Electrical Specifications ....................................................................................1-10
DC Voltage Specifications ............................................................................1-10
AC Voltage Specifications ............................................................................1-11
Resistance......................................................................................................1-13
DC Current ....................................................................................................1-15
AC Current ....................................................................................................1-16
Frequency ......................................................................................................1-18
Capacitance (8846A Only) ............................................................................1-19
Temperature (8846A only) ............................................................................1-19
Continuity......................................................................................................1-19

8845A/8846A
Users Manual
1-2
Diode Test .....................................................................................................1-20
Measurement Rates .......................................................................................1-20

Introduction and Specifications
Introduction 1
1-3
Introduction
The 8845A and 8846A are 6-1/2 digit, dual-display multimeters designed for bench-top,
field service, and system applications. Their full complement of measurement functions
plus its RS-232, IEEE 488, and Ethernet Remote Interfaces makes these multimeters
ideal candidates for precision manual measurements and use in automated systems. For
portability, these multimeters include a carrying handle that also serves as a bail for
bench top operation.
There are a few feature differences between these two multimeters, and some
specifications are tighter for the 8846A. Features that exist in only one multimeter will be
identified with the addition of “8846A Only” by each feature that is found only in that
model. Separate specification tables are also used to clarify the differences between these
two models.
The following is a list of some of the features and functions:
•Bright, large-digit, wide-viewing-angle display
•Dual display for displaying two properties of an input signal (e.g., ac voltage in one
display and frequency in the other).
•Remote operation via IEEE 488, RS-232, and Ethernet interface.
•Trigger in and measurement-complete out
•Front panel USB port for optional memory (8846A Only)
•6-1/2 digit resolution
•Half-rack width
•True rms ac
•2 and 4-wire resistance measurements
•Extended 10 Ωand 1 GΩranges (8846A Only)
•Frequency measurements to 300 kHz (8846A to 1 MHz)
•Capacitance measurements (8846A Only)
•Temperature measurement (8846A Only)
•10 A current capability
•Decibels (dB and dBm) with variable reference impedance and audio power
measurement capability
•Input terminals on both front and rear panels of the meter
•Closed-case calibration (no internal calibration adjustments)
Manual Set
The manual set for these multimeters consists of a Users Manual and Programmers
Manual on a CD ROM. The Users Manual contains information on specifications, setup,
and operating from the front panel. The Programmers Manual covers operating the Meter
from a PC or controller.

8845A/8846A
Users Manual
1-4
About this Manual
This is the Users Manual for the 8845A and 8846A Digital Multimeters (hereafter
referred to as the Meter). It contains all of the information a new user will need to operate
the Meter effectively. The manual is divided into the following chapters:
Chapter 1 “Introduction and Specifications” provides information on how to safely
use the Meter, standard and optional accessories, and specifications.
Chapter 2 “Preparing for Operation” provides information on setting the Meter’s line
voltage, connecting it to a power source, and turning the Meter on.
Chapter 3 “Front Panel Operation” introduces the controls and connections on the
front and rear panels of the Meter.
Chapter 4 “Making Measurements” provides detailed information on using the Meter
to make electrical measurements.
Appendices
Safety Information
This section addresses safety considerations and describes symbols that may appear on
the Meter or in the manual.
A XWarning statement identifies conditions or practices that could result in injury or
death.
A WCaution statement identifies conditions or practices that could result in damage to
the Meter or equipment to which it is connected.
XW Warning
To avoid electric shock, personal injury, or death, carefully read
the information under “Safety Information” before attempting to
install, use, or service the Meter.
General Safety Summary
This instrument has been designed and tested in accordance with the European standard
publication EN 61010-1:2001 and U.S. / Canadian standard publications UL 61010-1A1
and CAN/CSA-C22.2 No.61010.1. The Meter has been supplied in a safe condition.
This manual contains information and warnings that must be observed to keep the
instrument in a safe condition and ensure safe operation.
To use the Meter correctly and safely, read and follow the precautions in Table 1-1, and
follow all the safety instructions or warnings given throughout this manual that relate to
specific measurement functions. In addition, follow all generally accepted safety
practices and procedures required when working with and around electricity.

Introduction and Specifications
Safety Information 1
1-5
Table 1-1. Safety Information
XWWarning
To avoid possible electric shock, personal injury, or death, read the following before using
the Meter:
•Use the Meter only as specified in this manual, or the protection provided by the Meter
might be impaired.
•Do not use the Meter in wet environments.
•Inspect the Meter before using it. Do not use the Meter if it appears damaged.
•Inspect the test leads before use. Do not use them if insulation is damaged or metal is
exposed. Check the test leads for continuity. Replace damaged test leads before using
the Meter.
•Verify the Meter's operation by measuring a known voltage before and after using it. Do
not use the Meter if it operates abnormally. Protection may be impaired. If in doubt, have
the Meter serviced.
•Whenever it is likely that safety protection has been impaired, make the Meter inoperative
and secure it against any unintended operation.
•Have the Meter serviced only by qualified service personnel.
•Do not apply more than the rated voltage, as marked on the Meter, between the terminals
or between any terminal and earth ground.
•Always use the power cord and connector appropriate for the voltage and outlet of the
country or location in which you are working.
•Remove test leads from the Meter before opening the case.
•Never remove the cover or open the case of the Meter without first removing it from the
main power source.
•Never operate the Meter with the cover removed or the case open.
•Use caution when working with voltages above 30 V ac rms, 42 V ac peak, or 42 V dc.
These voltages pose a shock hazard.
•Use only the replacement fuse(s) specified by the manual.
•Use the proper terminals, function, and range for your measurements.
•Do not operate the Meter around explosive gas, vapor, or dust.
•When using probes, keep your fingers behind the finger guards.
•When making electrical connections, connect the common test lead before connecting
the live test lead; when disconnecting, disconnect the live test lead before disconnecting
the common test lead.
•Disconnect circuit power and discharge all high-voltage capacitors before testing
resistance, continuity, diodes, or capacitance.
•Before measuring current, check the Meter's fuses and turn OFF power to the circuit
before connecting the Meter to the circuit.
•When servicing the Meter, use only specified replacement parts.

8845A/8846A
Users Manual
1-6
Symbols
Table 1-2 is a list of safety and electrical symbols that appear on the Meter or in this
manual.
Table 1-2. Safety and Electrical Symbols
Symbol Description Symbol Description
WRisk of danger. Important
information. See manual ODisplay ON / OFF
XHazardous voltage. Voltage > 30 V
dc or ac peak might be present JEarth ground
BAC (Alternating Current) ECapacitance
FDC (Direct Current) GDiode
IFuse
D
or
C
AC or DC (Alternating or Direct
Current) YDigital signal
RContinuity test or continuity beeper
tone UMaintenance or Service
YPotentially hazardous voltage CAT II IEC 61010 Overvoltage (installation or
measurement) Category 2.
TDouble insulated <Recycle
hStatic awareness. Static discharge
can damage part(s) ~Do not dispose of this product as unsorted municipal waste. Contact Fluke or a qualified
recycler for disposal
Instrument Security Procedures
This section describes the Meter’s memory elements and the procedures for clearing
them.
Volatile Memory
Table 1-3 lists the Meter’s volatile memory elements.
Table 1-3. Volatile Memory Space
Type Size Function
SDRAM 128 MB Out-guard measurement data, user strings, temporary configuration information,
and Ethernet Host name.
SRAM 4 MB In-guard Measurement data and configuration information.
To clear both volatile memory elements listed in Table 1-3:
1. Press M.
2. Select the MANAGE MEMORY soft key.
3. Select the ERASE MEMORY soft key.

Introduction and Specifications
Accessories 1
1-7
Non Volatile Memory
Table 1-4 lists the Meter’s non-volatile memory elements.
Table 1-4. Non-volatile Memory Space
Type Size Function
Flash 128 MB Application program storage, user string, user data, user remote interface
settings.
Flash 4 MB FPGA hardware setup, application program storage, calibration constants.
To clear the 128 MB of non-volatile flash memory listed in Table 1-4:
1. Press M.
2. Select the MANAGE MEMORY soft key.
3. Select the ERASE MEMORY soft key.
This process clears only the user accessible portion of memory.
Note
The 4 MB non-volatile memory element is not usable and cannot be cleared
by the user.
Media Memory (8846A Only)
The 8846A has a front-panel USB port for connecting flash memory modules up to 2
Gigabytes to store Meter configuration and measurement data. To clear a memory
module while connected to the 8846A:
1. Press M.
2. Select the MANAGE MEMORY soft key.
3. Select the ERASE USB MEMORY soft key.
Accessories
Table 1-3 lists the available accessories for the 8845A and 8846A.
Table 1-5. Accessories
Model/Fluke PN Description
TL71 Premium Test Lead Set
6303 Kelvin Probes
6730 Kelvin Lead Set with Alligator Clips
5940 Kelvin clip set
5143 SMD Test Tweezer Leads
6275 Precision Electronic Probe Set
6344 Basic Electronic DMM Test Set
884X-Short 4-Wire Short
884X-Case Black plastic case

8845A/8846A
Users Manual
1-8
Table 1-3. Accessories (cont)
Model/Fluke PN Description
TL910 Precision Electronic Probe Set
TL80A Basic Electronic DMM Test Set
TL2X4W-PT 2X4 Wire Ohms Test Lead
TL2X4W-TWZ 2X4 Wire Ohms SMD Test Tweezer
6262-02 Test Probe Tip Adapter, Extended Fine Point
6263-02 Test Probe Tip Adapter, IC Probe Tip
803293 Fuse, 11 A, 1000 V, Fast, 406INX1.5IN, Buik
943121 Fuse, 440 mA, 1000 V, Fast, 406X1.375, Buik
884X-RTD 100 Ohm RTD Temperature Probe
Y8846 Rackmount Kit. Allows meter to be mounted in a standard 19-inch rack.
Y8021 Shielded IEEE 488 one-meter (39.4 inches) cable, with plug and jack at each end.
Y8022 Shielded IEEE 488 two-meter (78.8 inches) cable, with plug and jack at each end.
884X-USB USB to RS-232 Cable Adapter
RS43 Shielded RS-232 Cable (2 Meters)
884X-ETH Ethernet Cable
884X-512M 512 Mbyte memory (8846A only)
884X-1G 1 Gbyte memory (8846A only)
FVF-SC5 FlukeView Forms, Basic Software
FVF-UG FlukeView Forms, Software Upgrade – No Cable
FVF-SC4 Extended FlukeView Forms with USB Cable
2132558 Calibration, traceable with data
1259800 Calibration, traceable without data
1256480 Calibration, Z540 traceable with data
1258910 Calibration, Z540 traceable, without data
1256990 Calibration, accredited
1024830 Agreement, Extended Warranty
2426684 Agreement, Calibration, Traceable, with data
1028820 Agreement, Calibration, Traceable, without data
1259170 Agreement, Calibration, Z540 Traceable, with data
1258730 Agreement, Calibration, Z540 Traceable, without data
1259340 Agreement, Calibration, Accredited
2441827 Agreement, Calibration, primary standards lab
1540600 Agreement, Calibration, artifact

Introduction and Specifications
General Specifications 1
1-9
General Specifications
Power
Voltage
100 V Setting ...................................................... 90 V to 110 V
120 V Setting ...................................................... 108 V to 132 V
220 V Setting ...................................................... 198 V to 242 V
240 V Setting ...................................................... 216 V to 264 V
Frequency ............................................................... 47 Hz to 440 Hz. Automatically sensed at power-on.
Power Consumption................................................ 28 VA peak (12 Watt average)
Dimensions
Height...................................................................... 88 mm (3.46 in.)
Width....................................................................... 217 mm (8.56 in.)
Depth ...................................................................... 297 mm (11.7 in.)
Weight..................................................................... 3.6 kg (8.0 Ibs.)
Shipping Weight...................................................... 5.0 kg (11.0 lbs)
Display
Vacuum Fluorescent Display, dot matrix
Environment
Temperature
Operating ............................................................ 0 °C to 55 °C
Storage ............................................................... -40 °C to 70 °C
Warm Up............................................................. 1 hour to full uncertainty specifications
Relative Humidity (non-condensing)
Operating ............................................................ 0 °C to 28 °C <90 %
28 °C to 40 °C <80 %
40 °C to 55 °C <50 %
Storage ............................................................... -40 °C to 70 °C <95 %
Altitude
Operating ............................................................ 2,000 Meters
Storage ............................................................... 12,000 Meters
Vibration and Shock................................................ Complies with Mil-T-28800E Type III, Class 5 (Sine Only)
Safety
Designed to comply with IEC 61010-1:2000-1, UL 61010-1A1, CAN/CSA-C22.2 No. 61010.1, CAT I 1000V/CAT II 600V
EMC
Designed to comply with IEC 61326-1:2000-11 (EMC) when used with shielded communications cables. This Meter has
shown susceptibity to radiated frequencies greater than 1 V/m from 250 to 450 MHz while in the 100 µA range.
Triggering
Samples per Trigger ........................................... 1 to 50,000
Trigger Delay ...................................................... 0 S to 3600 S; in 10 µS increments
External Trigger Delay ........................................ <1 mS
External Trigger Jitter ......................................... <500 µS
Trigger Input ....................................................... TTL Levels
Trigger Output..................................................... 5 V maximum. (Open collector)

8845A/8846A
Users Manual
1-10
Memory
8845A ................................................................. 10,000 measurements, Internal only
8846A ................................................................. 10,000 measurements, Internal and up to 2 Gigabyte capacity with
USB memory module (available separately. see “Accessories”) through
front-panel USB port
Math Functions
Zero, dBm, dB, MX+B, Trend-plot, Histogram, Statistics (min/max/average/standard deviation), and Limit Test
Electrical
Input Protection .................................................... 1000 V all ranges
Overrange .............................................................. 20 % on all ranges except 1000 V dc, 1000 V ac (8846A),
750 V ac (8845A), Diode, and 10 A ranges
Remote Interfaces
RS-232 (RS-232 to USB cable available to connect the Meter to a PC USB port. See accessories)
IEEE 488.2
LAN
Warranty
One year
Electrical Specifications
Accuracy specifications are valid for 6½ digit mode after at least a 1-hour warm-up with Auto Zero is enabled.
24-hour specifications are relative to calibration standards and assume a controlled electromagnetic environment per
EN 61326-1:2000-11
DC Voltage Specifications
Maximum Input...................................................... 1000 V on any range
Common Mode Rejection..................................... 140 dB at 50 or 60 Hz ±0.1 % (1 kΩunbalance)
Normal Mode Rejection ........................................ 60 dB for NPLC of 1 or greater with dc filter off and power line
frequency ±0.1 %
100 dB for NPLC of 1 or greater with dc filter on and power line
frequency ±0.1 %
Measurement Method ........................................... Multi-ramp A/D
A/D Linearity.......................................................... 0.0002 % of measurement + 0.0001 % of range
Input Bias Current................................................. <30 pA at 25 °C
Autozero Off Operation ........................................ Following instrument warm-up at calibration temperature ±1 °C and
less than 10 minutes, add error: 0.0002 % range additional error + 5
µV.
Settling Considerations........................................ Measurement settling times are affected by source impedance, cable
dielectric characteristics, and input signal changes.
Input Characteristics
Resolution
Range Full Scale
(6½ Digits) 4½ Digits 5½ Digits 6½ Digits Input Impedance
100 mV 100.0000 mV 10 µV 1 µV 100 nV 10 MΩor >10 GΩ[1]
1 V 1.000000 V 100 µV 10 µV 1 µV 10 MΩor >10 GΩ[1]
10 V 10.00000 V 1 mV 100 µV 10 µV 10 MΩor >10 GΩ[1]
100 V 100.0000 V 10 mV 1 mV 100 µV 10 MΩ±1%
1000 V 1,000.000 V 100 mV 10 mV 1 mV 10 MΩ±1%
[1] Inputs beyond ±14 V are clamped through 200 kΩtypical. 10 MΩis default input impedance.