Fluke 8845A Use and care manual

®
8845A/8846A
Digital Multimeter
Calibration Manual
January 2007
© 2007 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
Safety Information ............................................................................................. 1-3
Symbols ......................................................................................................... 1-4
General Safety Summary............................................................................... 1-4
Description of IEC 61010 Measurement Categories ......................................... 1-6
Organization of the Calibration Manual ............................................................ 1-7
Chapter 1 – Introduction and Specifications ................................................. 1-7
Chapter 2 – General Maintenance ................................................................. 1-7
Chapter 3 – Performance Test and Calibration.............................................. 1-7
Chapter 4 – List of Replaceable Parts ........................................................... 1-7
Operating Instructions........................................................................................ 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
Input Characteristics.................................................................................. 1-10
8846A Accuracy........................................................................................ 1-11
8845A Accuracy........................................................................................ 1-11
Additional Errors....................................................................................... 1-11
AC Voltage Specifications ............................................................................ 1-11
Input Characteristics.................................................................................. 1-12
8846A Accuracy........................................................................................ 1-12

8845A/8846A
Calibration Manual
ii
8845A Accuracy........................................................................................ 1-13
Additional Low Frequency Errors............................................................. 1-13
Resistance...................................................................................................... 1-14
Input Characteristics.................................................................................. 1-14
8846A Accuracy........................................................................................ 1-14
8845A Accuracy........................................................................................ 1-14
Additional Ohms Errors ............................................................................ 1-15
DC Current .................................................................................................... 1-15
Input Characteristics.................................................................................. 1-15
Accuracy (8846A)..................................................................................... 1-15
Accuracy (8845A)..................................................................................... 1-16
Additional Current Errors ......................................................................... 1-16
AC Current .................................................................................................... 1-16
Input Characteristics.................................................................................. 1-16
8846A Accuracy........................................................................................ 1-17
8845A Accuracy........................................................................................ 1-18
Additional Low Frequency Errors............................................................. 1-18
Frequency ...................................................................................................... 1-18
8846A Accuracy........................................................................................ 1-19
8845A Accuracy........................................................................................ 1-19
Gate Time vs. Resolution.......................................................................... 1-19
Additional Low Frequency Errors............................................................. 1-20
Capacitance (8846A Only) ............................................................................ 1-20
Temperature (8846A only) ............................................................................ 1-20
Continuity...................................................................................................... 1-20
Diode Test ..................................................................................................... 1-21
Measurement Rates ....................................................................................... 1-21
Measurement Uncertainty.................................................................................. 1-21
Interpreting Accuracy Specifications................................................................. 1-22
24-Hour Accuracy ......................................................................................... 1-22
90-Day and 1-Year Accuracy ........................................................................ 1-22
Temperature Coefficients .............................................................................. 1-22
Configuring for Highest Accuracy Measurements ............................................ 1-22
DC Voltage, DC Current, and Resistance Measurements ............................. 1-22
AC Voltage and AC Current Measurements: ................................................ 1-22
Frequency and Period Measurements:........................................................... 1-22
2 General Maintenance .......................................................................... 2-1
Introduction........................................................................................................ 2-3
Warranty Repairs and Shipping Information..................................................... 2-3
General Maintenance Information ..................................................................... 2-3
Required Equipment...................................................................................... 2-3
Power Requirements...................................................................................... 2-3
Static Safe Handling ...................................................................................... 2-3
Cleaning............................................................................................................. 2-4
Fuse Replacement .............................................................................................. 2-4
Line-Power Fuse............................................................................................ 2-4
Current-Input Fuses ....................................................................................... 2-5
If the Meter Does Not Turn On.......................................................................... 2-7
Display Tests...................................................................................................... 2-7
Disassembly Procedures .................................................................................... 2-7
General Disassembly ..................................................................................... 2-7
Main Chassis Disassembly ............................................................................ 2-8
Front Panel Disassembly ............................................................................... 2-8

Contents (continued)
iii
Assembly Procedures......................................................................................... 2-8
3 Performance Test and Calibration..................................................... 3-1
Introduction........................................................................................................ 3-3
Required Equipment .......................................................................................... 3-3
Test Considerations............................................................................................ 3-5
Performance Tests.............................................................................................. 3-5
Volts DC Verification.................................................................................... 3-5
Volts AC and Frequency Verification ........................................................... 3-8
4-Wire Ohms Verification............................................................................. 3-12
2-Wire Ohms Verification............................................................................. 3-14
2X4 Test Lead Verification Steps ................................................................. 3-16
Rear Panel Terminal Verification Steps ........................................................ 3-16
Capacitance Verification Steps (8846A only) ............................................... 3-18
DC Current Verification Steps ...................................................................... 3-19
AC Current Verification Steps ...................................................................... 3-22
Adjustment (Calibration) ................................................................................... 3-24
Unlocking the Meter for Front-Panel Adjustments (Calibration).................. 3-24
Unlocking the Meter for Adjustments Over a Remote Interface................... 3-25
Changing the Calibration Password .............................................................. 3-25
Resetting the Calibration Password............................................................... 3-25
Equipment for Calibration............................................................................. 3-26
Adjustment Process ....................................................................................... 3-26
Aborting a Calibration Process...................................................................... 3-32
Sample Adjustment Program......................................................................... 3-32
4 List of Replaceable Parts.................................................................... 4-1
Introduction........................................................................................................ 4-3
How to Obtain Parts........................................................................................... 4-3
How to Contact Fluke ........................................................................................ 4-3
Parts ................................................................................................................... 4-4
Appendices
A Verification Forms ...................................................................................... A-1
B Example Adjustment Program .................................................................... B-1

8845A/8846A
Calibration Manual
iv

v
List of Tables
Table Title Page
1-1. Safety and Electrical Symbols................................................................................ 1-4
1-2. Safety Information ................................................................................................. 1-5
1-3. Accessories............................................................................................................. 1-7
2-1. Line Voltage to Fuse Rating................................................................................... 2-5
3-1. Required Test Equipment....................................................................................... 3-3
3-2. 8846A DC Volts Verification Steps....................................................................... 3-6
3-3. 8845A DC Volts Verification Steps....................................................................... 3-7
3-4. 8846A AC Volts Verification Steps....................................................................... 3-9
3-5. 8845A AC Volts Verification Steps....................................................................... 3-10
3-6. 8845A/8846A AC Volts Frequency Verification Steps ......................................... 3-11
3-7. 8846A 4-Wire Ohms Verification Steps ................................................................ 3-13
3-8. 8845A 4-Wire Ohms Verification Steps ................................................................ 3-13
3-9. 8846A 2-Wire Ohms Verification Steps ................................................................ 3-15
3-10. 8845A 2-Wire Ohms Verification Steps ................................................................ 3-15
3-11. 8846A Rear-Panel Terminal Verification Steps (Optional Test) ........................... 3-18
3-12. 8845A Rear-Panel Terminal Verification Steps (Optional Test) ........................... 3-18
3-13. 8846A Capacitance Verification Steps .................................................................. 3-18
3-14. 8846A DC Current Verification Steps ................................................................... 3-19
3-15. 8845A DC Current Verifications Steps.................................................................. 3-20
3-17. 8845A AC Current Verification Steps ................................................................... 3-23
3-18. 8845A/8846A Adjustment Steps............................................................................ 3-27
4-1. Replaceable Parts ................................................................................................... 4-4
A-1. Blank Verification Record for 90-Day Specifications ........................................... A-2
A-2. Blank Verification Record for 1-Year Specifications ............................................ A-9

8845A/8846A
Calibration Manual
vi

vii
List of Figures
Figure Title Page
1-1. IEC 61010 Measurement Category (CAT) Levels................................................. 1-6
2-1. Line Fuse Replacement .......................................................................................... 2-5
2-2. Current Input Fuse Replacement............................................................................ 2-6
3-1. DC Volts Test Equipment Setup with 5520A ........................................................ 3-6
3-2. AC Volts Test Equipment Setup with 5520A ........................................................ 3-8
3-3. 4-Wire Ohms Test Equipment Setup ..................................................................... 3-12
3-4. 2-Wire Ohms Test Equipment Setup ..................................................................... 3-14
3-5. Rear-Panel Terminals Equipment Setup ................................................................ 3-17
3-6. Capacitance Equipment Setup................................................................................ 3-18
3-7. DC Current Equipment Setup ................................................................................ 3-19
3-8. AC Current Equipment Setup ................................................................................ 3-22
3-9. Calibration Jumper Location.................................................................................. 3-26
4-1. Final Assembly....................................................................................................... 4-7

8845A/8846A
Calibration Manual
viii

1-1
Chapter 1
Introduction and Specifications
Title Page
Introduction........................................................................................................ 1-3
Safety Information ............................................................................................. 1-3
Symbols ......................................................................................................... 1-4
General Safety Summary............................................................................... 1-4
Description of IEC 61010 Measurement Categories ......................................... 1-6
Organization of the Calibration Manual ............................................................ 1-7
Chapter 1 – Introduction and Specifications ................................................. 1-7
Chapter 2 – General Maintenance ................................................................. 1-7
Chapter 3 – Performance Test and Calibration.............................................. 1-7
Chapter 4 – List of Replaceable Parts ........................................................... 1-7
Operating Instructions........................................................................................ 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...................................................................................................... 1-14
DC Current .................................................................................................... 1-15
AC Current .................................................................................................... 1-16
Frequency ...................................................................................................... 1-18
Capacitance (8846A Only) ............................................................................ 1-20
Temperature (8846A only) ............................................................................ 1-20
Continuity...................................................................................................... 1-20

8845A/8846A
Calibration Manual
1-2
Diode Test ..................................................................................................... 1-21
Measurement Rates ....................................................................................... 1-21
Measurement Uncertainty.................................................................................. 1-21
Interpreting Accuracy Specifications................................................................. 1-22
24-Hour Accuracy ......................................................................................... 1-22
90-Day and 1-Year Accuracy ........................................................................ 1-22
Temperature Coefficients .............................................................................. 1-22
Configuring for Highest Accuracy Measurements ............................................ 1-22
DC Voltage, DC Current, and Resistance Measurements ............................. 1-22
AC Voltage and AC Current Measurements: ................................................ 1-22
Frequency and Period Measurements:........................................................... 1-22

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 additional features in the 8846A that are not present in the 8845A. These
features will be identified with the annotation 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)
This calibration manual focuses on performance verification and calibration of the Fluke
8845A and 8846A Digital Multimeters (hereafter referred to as the Meter).
Safety Information
This section addresses safety considerations and describes symbols that may appear on
the Meter or in the manual.
A Warning statement identifies conditions or practices that could result in injury or
death.
A Caution statement identifies conditions or practices that could result in damage to the
Meter or equipment to which it is connected.

8845A/8846A
Calibration Manual
1-4
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.
Symbols
Table 1-1 is a list of safety and electrical symbols that appear on the Meter or in this
manual.
Table 1-1. 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
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 1-2, 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 1-2. 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.
•Servicing of the Meter should be performed 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.
•While in IEC Measurement Category II environments, do not apply voltages above 600 V
ac to the input of the Meter. See “Description of IEC 61010 Measurement Categories”
later in this chapter.
•Always use the power cord and connector appropriate for the voltage and outlet of the
country or location in which you are working.
•Always use a power cord with a ground connection and ensure the ground is properly
connected to the power distribution system.
•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.
•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
Calibration Manual
1-6
WCaution
To prevent damage to the Meter, do not change the position of
the Front/Rear switch while signals are applied to either the
front or rear input terminals.
Description of IEC 61010 Measurement Categories
The IEC 61010 safety standard defines four Overvoltage (Installation) Categories (CAT I
to CAT IV) based on the magnitude of danger from transient impulses as shown in
Figure 1-1.
Service
Entrance Meter
Meter
Service
Entrance
Meter
Outbuilding
Outbuilding
Transformer
Underground Service
Underground Service
CAT I
Electronic CAT II Appliances,
PCs, TVs
CAT III
MC Panels, etc. CAT IV
Service
Entrance
cat_levels.eps
Figure 1-1. IEC 61010 Measurement Category (CAT) Levels
The IEC 61010 Measurement CAT level indicates the level of protection the instrument
provides against impulse withstand voltage.
CAT I equipment is designed to protect against transients from high-voltage, low-energy
sources, such as electronic circuits or a copy machine.
CAT II equipment is designed to protect against transients from energy-consuming
equipment supplied from the fixed installation, such as TVs, PCs, portable tools, and
other household appliances.
CAT III equipment is designed to protect against transients in equipment in fixed
equipment installations, such as distribution panels, feeders and short branch circuits, and
lighting systems in large buildings.
CAT IV equipment is designed to protect against transients from the primary supply
level, such as an electricity meter or an overhead or underground utility service.

Introduction and Specifications
Organization of the Calibration Manual 1
Organization of the Calibration Manual
This calibration manual is divided into the following chapters:
Chapter 1 – Introduction and Specifications
This chapter introduces the Fluke 8845A and 8846A Digital Multimeters, describing their
features, and accessories. This chapter also discusses use of the Calibration Manual and
the various conventions used in describing the meter’s circuitry and presents a complete
set of specifications.
Chapter 2 – General Maintenance
Chapter 2 provides maintenance information covering handling, cleaning, and fuse
replacement. Access and reassembly procedures are also explained in this chapter.
Chapter 3 – Performance Test and Calibration
This chapter provides performance verification procedures related to the specifications
presented in Chapter 1. To maintain these specifications, a full adjustment/calibration
procedure is also presented.
Chapter 4 – List of Replaceable Parts
Chapter 4 includes parts lists for all standard assemblies and information on how and
where to order parts.
Operating Instructions
Full operating instructions are provided in the Fluke 8845A/8846A Users Manual.
Reference to these instructions may be necessary during some of the maintenance and
repair procedures presented in this Calibration Manual.
Accessories
Table 1-3lists the available accessories for the 8845A and 8846A.
Table 1-3. Accessories
Model/Fluke PN Description
TL71 Test Lead Set, Premium DMM
TL910 Precision Electronic Probe Set
TL80A Basic Electronic DMM Test Set
8845A-TPIT Test Probe Ic Tip (Set Red & Black)
8845A-EFPT Extended Fine Pt Tip Adap Set (Set Red/Black)
884X-SHORT 4-Wire short
TL2X4W-PTII 2x4 Wire Ohms 1000V Test lead
884X-RTD 100 Ohm RTD Temperature Probe
884X-512M USB Memory 512M
1-7

8845A/8846A
Calibration Manual
Table 1-3. Accessories (cont)
Model/Fluke PN Description
884X-1G USB Memory 1 GB
884X-USB USB to RS232 cable adapter
884X-ETH Ethernet Interface Cable
RS43 RS232 Cable (RS43, 2m)
Y8021 IEEE488 cable (1m)
Y8022 IEEE488 cable (2m)
884X-CASE Black Case
FVF-UG FlukeView Forms Software Upgrade - NO cable
FVF-SC4 Flukeview Forms W/Cable For 8845/8846
FVF-SC5 Flukeview Forms -Basic For 8845/8846
Y8846S Rack Mount Kit 8845A & 8846A Single
Y8846D Rack Mount Kit 8845A & 8846A Dual
FUSE Fuse,11A,1000V,Fast.406inx1.5in,Bulk
FUSE Fuse,.440 mA,1000V,Fast,.406X1.375,Bulk
2132558 Calibration, Traceable, w/ Data
1259800 Calibration, Traceable, w/o Data
1256480 Calibration, Z540 Traceable, w/ Data
1258910 Calibration, Z540 Traceable, w/o Data
1256990 Calibration, Accredited
1024830 Agreement, Extended Warranty
2426684 Agreement, Calibration, Traceable, w/ Data
1028820 Agreement, Calibration, Traceable, w/o Data
1259170 Agreement, Calibration, Z540 Traceable, w/ Data
1258730 Agreement, Calibration, Z540 Traceable, w/o Data
1259340 Agreement, Calibration, Accredited
2441827 Agreement, Calibration, Primary Standards Lab
1540600 Agreement, Calibration, Artifact
1-8

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 lbs)
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-28800F 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 susceptibility to radiated frequencies greater than 1 V/m from 250 to 450 MHz.
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
Calibration Manual
1-10
Memory
8845A ................................................................. 5,000 measurements, internal only
8846A ................................................................. 5,000 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 resolution mode after at least a 1-hour warm-up with Auto Zero enabled.
24-hour specifications are relative to calibration standards and assume a controlled electromagnetic environment per
EN 61326-1:2000-11
Note
NPLC stands for Number of Power Line Cycles and refers to the number of cycles of the line
voltage.
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 Resolution 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.