Fluke 8846A User 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	Fluke Europe B.V.
P.O. Box 9090	P.O. Box 1186
Everett, WA 98206-9090	5602 BD Eindhoven
U.S.A.	The Netherlands

11/99

To register your product online, visit register.fluke.com

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

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	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

ii

			Contents (continued)
	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

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iv

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

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vi

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

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viii

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

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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

1-2

Introduction and Specifications 1

Introduction

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 Ω and 1 GΩ ranges (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.

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Calibration Manual

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
W	Risk of danger. Important	O	Display ON / OFF
	information. See manual
X	Hazardous voltage. Voltage > 30 V	J	Earth ground
	dc or ac peak might be present
B	AC (Alternating Current)	E	Capacitance
F	DC (Direct Current)	G	Diode
D	AC or DC (Alternating or Direct	I	Fuse
or
C	Current)	Y	Digital signal
R	Continuity test or continuity beeper	U	Maintenance or Service
	tone
Y	Potentially hazardous voltage	CAT II	IEC 61010 Overvoltage (installation or
			measurement) Category 2.
T	Double insulated	<	Recycle
h	Static awareness. Static discharge	~	Do not dispose of this product as unsorted
	can damage part(s)		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.

1-4

Introduction and Specifications 1

Safety Information

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.

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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.

CAT I	CAT II	CAT III	CAT IV
Electronic	Appliances,	MC Panels, etc.
	PCs, TVs
		Service
		Entrance
			Meter

	Service	Outbuilding
	Entrance
		Meter
		Underground Service

Service

Transformer

Outbuilding

Entrance

Meter

Underground Service

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.

1-6

Introduction and Specifications 1

Organization of the Calibration Manual

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 1-3 lists 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

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	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	1
	General Specifications
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)

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Calibration Manual

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 kΩ unbalance)
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

	Range	Resolution		Resolution		Input Impedance
			4½ Digits	5½ Digits	6½ Digits
	100 mV	100.0000 mV	10 µV	1 µV	100 nV	10 MΩ or >10 GΩ[1]
	1 V	1.000000 V	100 µV	10 µV	1 µV	10 MΩ or >10 GΩ[1]
	10 V	10.00000 V	1 mV	100 µV	10 µV	10 MΩ or >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 kΩ typical. 10 MΩ is default input impedance.

1-10

Introduction and Specifications 1

Electrical Specifications

8846A Accuracy

Accuracy is given as ± (% measurement + % of range)

	Range	24 Hour		90 Days		1 Year		Temperature
								Coefficient/ °C
		(23 ±1 °C)		(23 ±5 °C)		(23 ±5 °C)
								Outside 18 to 28 °C
	100 mV	0.0025	+ 0.003	0.0025	+ 0.0035	0.0037	+ 0.0035	0.0005 + 0.0005
	1 V	0.0018	+ 0.0006	0.0018	+ 0.0007	0.0025	+ 0.0007	0.0005 + 0.0001
	10 V	0.0013	+ 0.0004	0.0018	+ 0.0005	0.0024	+ 0.0005	0.0005 + 0.0001
	100 V	0.0018	+ 0.0006	0.0027	+ 0.0006	0.0038	+ 0.0006	0.0005 + 0.0001
	1000 V	0.0018	+ 0.0006	0.0031	+ 0.001	0.0041	+ 0.001	0.0005 + 0.0001

8845A Accuracy

Accuracy is given as ± (% measurement + % of range)

	Range	24 Hour		90 Days	1 Year	Temperature
						Coefficient/ °C
		(23 ±1 °C)		(23 ±5 °C)	(23 ±5 °C)
						Outside 18 to 28 °C
	100 mV	0.003	+ 0.003	0.004 + 0.0035	0.005 + 0.0035	0.0005 + 0.0005
	1 V	0.002	+ 0.0006	0.003 + 0.0007	0.004 + 0.0007	0.0005 + 0.0001
	10 V	0.0015 + 0.0004		0.002 + 0.0005	0.0035 + 0.0005	0.0005 + 0.0001
	100 V	0.002	+ 0.0006	0.0035 + 0.0006	0.0045 + 0.0006	0.0005 + 0.0001
	1000 V	0.002	+ 0.0006	0.0035 + 0.0010	0.0045 + 0.0010	0.0005 + 0.0001

Additional Errors

Digits	NPLC	Additional Noise Error
6½	100	0 % of range
6½	10	0 % of range
5½	1	0.001 % of range
5½	.2	0.001 % of range +20 μV
4½	0.02	0.01 % of range +20 μV

AC Voltage Specifications

AC Voltage specifications are for ac sinewave signals >5 % of range. For inputs from 1 % to 5 % of range and <50 kHz, add an additional error of 0.1 % of range, and for 50 to 100 kHz, add 0.13 % of range.

Maximum Input......................................................	750 V rms or 1000 V peak (8845A), 1000 V rms or 1414 V peak
	(8846A) or 8 x 107 volts-Hertz product (whichever is less) for any
	range.
Measurement Method...........................................	AC-coupled true-rms. Measures the ac component of input with up to
	1000 V dc bias on any range.
AC Filter Bandwidth:
Slow ....................................................................	3 Hz – 300 kHz
Medium ...............................................................	20 Hz – 300 kHz
Fast.....................................................................	200 Hz – 300 kHz
Common Mode Rejection.....................................	70 dB at 50 Hz or 60 Hz ±0.1 % (1 kΩ unbalance)
Maximum Crest Factor .........................................	5:1 at Full Scale
Additional Crest Factor Errors (<100 Hz) ...........	Crest factor 1-2, 0.05 % of full scale
	Crest factor 2-3, 0.2 % of full scale
	Crest factor 3-4, 0.4 % of full scale
	Crest factor 4-5, 0.5 % of full scale

1-11

8845A/8846A

Calibration Manual

Input Characteristics

	Range	Resolution		Resolution		Input Impedance
			4½ Digits	5½ Digits	6½ Digits
	100 mV	100.0000 mV	10 µV	1 µV	100 nV
	1 V	1.000000 V	100 µV	10 µV	1 µV	1 MΩ ±2 % shunted
	10 V	10.00000 V	1 mV	100 µV	10 µV
						by <100 pf
	100 V	100.0000 V	10 mV	1 mV	100 µV
	1000 V	1,000.000 V	100 mV	10 mV	1 mV

8846A Accuracy

Accuracy is given as ± (% measurement + % of range)

Range			Frequency	24 Hour		90 Days	1 Year	Temperature
								Coefficient/ °C
				(23 ±1 °C)		(23 ±5 °C)	(23 ±5 °C)
								Outside 18 to 28 °C
100 mV	3 –		5 Hz	1.0	+ 0.03	1.0 + 0.04	1.0 + 0.04	0.1	+ 0.004
	5 –		10 Hz	0.35 + 0.03		0.35 + 0.04	0.35 + 0.04	0.035 + 0.004
	10		Hz – 20 kHz	0.04 + 0.03		0.05 + 0.04	0.06 + 0.04	0.005 + 0.004
	20	– 50 kHz		0.1	+ 0.05	0.11 + 0.05	0.12 + 0.05	0.011 + 0.005
	50	– 100 kHz		0.55 + 0.08		0.6 + 0.08	0.6 + 0.08	0.06 + 0.008
	100 – 300 kHz[1]			4.0	+ 0.50	4.0 + 0.50	4.0 + 0.50	0.20 + 0.02
1 V	3 –		5 Hz	1.0	+ 0.02	1.0 + 0.03	1.0 + 0.03	0.1	+ 0.003
	5 –		10 Hz	0.35 + 0.02		0.35 + 0.03	0.35 + 0.03	0.035 + 0.003
	10		Hz – 20 kHz	0.04 + 0.02		0.05 + 0.03	0.06 + 0.03	0.005 + 0.003
	20	– 50 kHz		0.1	+ 0.04	0.11 + 0.05	0.12 + 0.05	0.011 + 0.005
	50	– 100 kHz		0.55 + 0.08		0.6 + 0.08	0.6 + 0.08	0.06 + 0.008
	100 – 300 kHz[1]			4.0	+ 0.50	4.0 + 0.50	4.0 + 0.50	0.2	+ 0.02
10 V	3 –		5 Hz	1.0	+ 0.02	1.0 + 0.03	1.0 + 0.03	0.1	+ 0.003
	5 –		10 Hz	0.35 + 0.02		0.35 + 0.03	0.35 + 0.03	0.035 + 0.003
	10		Hz – 20 kHz	0.04 + 0.02		0.05 + 0.03	0.06 + 0.03	0.005 + 0.003
	20	– 50 kHz		0.1	+ 0.04	0.11 + 0.05	0.12 + 0.05	0.011 + 0.005
	50	– 100 kHz		0.55 + 0.08		0.6 + 0.08	0.6 + 0.08	0.06 + 0.008
	100 – 300 kHz[1]			4.0	+ 0.50	4.0 + 0.50	4.0 + 0.50	0.2	+ 0.02
100 V	3 –		5 Hz	1.0	+ 0.02	1.0 + 0.03	1.0 + 0.03	0.1	+ 0.003
	5 –		10 Hz	0.35 + 0.02		0.35 + 0.03	0.35 + 0.03	0.035 + 0.003
	10		Hz – 20 kHz	0.04 + 0.02		0.05 + 0.03	0.06 + 0.03	0.005 + 0.003
	20	– 50 kHz		0.1	+ 0.04	0.11 + 0.05	0.12 + 0.05	0.011 + 0.005
	50	– 100 kHz		0.55 + 0.08		0.6 + 0.08	0.6 + 0.08	0.06 + 0.008
	100 –- 300 kHz[1]			4.0	+ 0.50	4.0 + 0.50	4.0 + 0.50	0.2	+ 0.02
1000 V	3 –		5 Hz	1.0	+ 0.02	1.0 + 0.03	1.0 + 0.03	0.1	+ 0.003
	5 –		10 Hz	0.35 + 0.02		0.35 + 0.03	0.35 + 0.03	0.035 + 0.003
	10		Hz – 20 kHz	0.04 + 0.02		0.05 + 0.03	0.06 + 0.03	0.005 + 0.003
	20	– 50 kHz		0.1	+ 0.04	0.11 + 0.05	0.12 + 0.05	0.011 + 0.005
	50	– 100 kHz[2]		0.55 + 0.08		0.6 + 0.08	0.6 + 0.08	0.06 + 0.008
	100 – 300 kHz[1][2]			4.0	+ 0.5	4.0 + 0.50	4.0 + 0.50	0.2	+ 0.02

[1] Typically 30 % reading error at 1 MHz

[2] 1000 Volt range is limited to 8 X 107 volt-Hertz

1-12

Introduction and Specifications 1

Electrical Specifications

8845A Accuracy

Accuracy is given as ± (% measurement + % of range)

			Frequency	24 Hour		90 Days		1 Year		Temperature
Range										Coefficient/ °C
			(Hz)	(23 ±1 °C)		(23 ±5 °C)		(23 ±5 °C)
										Outside 18 to 28 °C
100 mV	3	– 5 Hz		1.0	+ 0.03	1.0	+ 0.04	1.0	+ 0.04	0.10 + 0.004
	5	– 10 Hz		0.35 + 0.03		0.35 + 0.04		0.35 + 0.04		0.035 + 0.004
	10		Hz – 20 kHz	0.04 + 0.03		0.05 + 0.04		0.06 + 0.04		0.005 + 0.004
	20		– 50 kHz	0.1	+ 0.05	0.11 + 0.05		0.12 + 0.05		0.011 + 0.005
	50		– 100 kHz	0.55 + 0.08		0.6	+ 0.08	0.6 + 0.08		0.06 + 0.008
	100 – 300 kHz[1]			4.0	+ 0.50	4.0	+ 0.50	4.0	+ 0.50	0.2	+ 0.02
1 V	3	– 5 Hz		1.0	+ 0.02	1.0	+ 0.03	1.0	+ 0.03	0.1	+ 0.003
	5	– 10 Hz		0.35 + 0.02		0.35 + 0.03		0.35 + 0.03		0.035 + 0.003
	10		Hz – 20 kHz	0.04 + 0.02		0.05 + 0.03		0.06 + 0.03		0.005 + 0.003
	20		– 50 kHz	0.1	+ 0.04	0.11 + 0.05		0.12 + 0.05		0.011 + 0.005
	50		– 100 kHz	0.55 + 0.08		0.6	+ 0.08	0.6	+ 0.08	0.06 + 0.008
	100 – 300 kHz[1]			4.0	+ 0.50	4.0	+ 0.50	4.0	+ 0.50	0.2	+ 0.02
10 V	3	– 5 Hz		1.0	+ 0.02	1.0	+ 0.03	1.0	+ 0.03	0.1	+ 0.003
	5	– 10 Hz		0.35 + 0.02		0.35 + 0.03		0.35 + 0.03		0.035 + 0.003
	10		Hz – 20 kHz	0.04 + 0.02		0.05 + 0.03		0.06 + 0.03		0.005 + 0.003
	20		– 50 kHz	0.1	+ 0.04	0.11 + 0.05		0.12 + 0.05		0.011 + 0.005
	50		– 100 kHz	0.55 + 0.08		0.6	+ 0.08	0.6	+ 0.08	0.06 + 0.008
	100 – 300 kHz[1]			4.0	+ 0.50	4.0	+ 0.50	4.0	+ 0.50	0.2	+ 0.02
100 V	3	– 5 Hz		1.0	+ 0.02	1.0	+ 0.03	1.0	+ 0.03	0.1	+ 0.003
	5	– 10 Hz		0.35 + 0.02		0.35 + 0.03		0.35 + 0.03		0.035 + 0.003
	10		Hz – 20 kHz	0.04 + 0.02		0.05 + 0.03		0.06 + 0.03		0.005 + 0.003
	20		– 50 kHz	0.1	+ 0.04	0.11 + 0.05		0.12 + 0.05		0.011 + 0.005
	50		– 100 kHz	0.55 + 0.08		0.6	+ 0.08	0.6	+ 0.08	0.06 + 0.008
	100 – 300 kHz[1]			4.0	+ 0.50	4.0	+ 0.50	4.0	+ 0.50	0.2	+ 0.02
750 V	3	–- 5 Hz		1.0	+ 0.02	1.0	+ 0.03	1.0	+ 0.03	0.1	+ 0.003
	5	– 10 Hz		0.35 + 0.02		0.35 + 0.03		0.35 + 0.03		0.035 + 0.003
	10		Hz – 20 kHz	0.04 + 0.02		0.05 + 0.03		0.06 + 0.03		0.005 + 0.003
	20		– 50 kHz	0.1	+ 0.04	0.11 + 0.05		0.12 + 0.05		0.011 + 0.005
	50		– 100 kHz [2]	0.55 + 0.08		0.6	+ 0.08	0.6	+ 0.08	0.06 + 0.008
	100 – 300 kHz[1] [2]			4.0	+ 0.5	4.0	+ 0.5	4.0	+ 0.5	0.2	+ 0.02

[1] Typically 30 % reading error at 1 MHz

[2] 750 Volt range is limited to 8 X 107 volt-Hertz

Additional Low Frequency Errors

Error is stated as % of reading.

		Frequency		AC Filter
			3HZ (slow)	20HZ (medium)	200HZ (fast)
10	– 20 Hz		0	0.25	–
20	– 40 Hz		0	0.02	–
40	– 100 Hz		0	0.01	0.55
100		– 200 Hz	0	0	0.2
200		Hz – 1 kHz	0	0	0.02
>1 kHz			0	0	0

1-13

8845A/8846A

Calibration Manual

Resistance

Specifications are for 4-wire resistance function, 2 x 4-wire resistance, or 2-wire resistance with zero. If zero is not used, add 0.2 Ω for 2-wire resistance plus lead resistance, and add 20 mΩ for 2 x 4-wire resistance function.

Measurement Method...........................................	Current source referenced to LO input
Max. Lead Resistance (4-wire ohms) ..................	10 % of range per lead for 100 Ω, 1 kΩ ranges. 1 kΩ per lead on all
	other ranges
Input Protection ....................................................	1000 V on all ranges
Common Mode Rejection.....................................	140 dB at 50 or 60 Hz ± 0.1 % (1 kΩ unbalance)
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 %

Input Characteristics

Range	Resolution			Resolution			Source Current
			4½ Digits	5½ Digits	6½ Digits
10 Ω[1]	10.00000	Ω	1 mΩ	100 μΩ	10 μΩ	5 mA/13 V
100 Ω	100.0000	Ω	10 mΩ	1 mΩ	100 μΩ	1 mA/6 V
1 kΩ	1.000000 kΩ		100 mΩ	10 mΩ	1 mΩ	1 mA/6 V
10 kΩ	10.00000 kΩ		1 Ω	100 mΩ	10 mΩ	100 μA/6 V
100 kΩ	100.0000 kΩ		10 Ω	1 Ω	100 mΩ	100 μA/13 V
1 MΩ	1.000000 MΩ		100 Ω	10 Ω	1 Ω	10 μA/13 V
10 MΩ	10.00000 MΩ		1 kΩ	100 Ω	10 Ω	1	μA/13 V
100 MΩ	100.0000 MΩ		10 kΩ	1 kΩ	100 Ω	1	μA || 10 MΩ/10 V
1.0 GΩ[1]	1.000000	GΩ	100 kΩ	10 kΩ	1 kΩ	1	μA || 10 MΩ/10 V

[1] 8846A Only

8846A Accuracy

Accuracy is given as ± (% measurement + % of range)

	Range	24 Hour		90 Days		1 Year	Temperature
							Coefficient/ °C
		(23 ±1 °C)		(23 ±5 °C)		(23 ±5 °C)
							Outside 18 to 28 °C
	10 Ω	0.003	+ 0.01	0.008	+ 0.03	0.01+ 0.03	0.0006 + 0.0005
	100 Ω	0.003	+ 0.003	0.008	+ 0.004	0.01 + 0.004	0.0006 + 0.0005
	1 kΩ	0.002	+ 0.0005	0.008	+ 0.001	0.01 + 0.001	0.0006 + 0.0001
	10 kΩ	0.002	+ 0.0005	0.008	+ 0.001	0.01 + 0.001	0.0006 + 0.0001
	100 kΩ	0.002	+ 0.0005	0.008	+ 0.001	0.01 + 0.001	0.0006 + 0.0001
	1 MΩ	0.002	+ 0.001	0.008	+ 0.001	0.01 + 0.001	0.001 + 0.0002
	10 MΩ	0.015	+ 0.001	0.02 + 0.001		0.04 + 0.001	0.003 + 0.0004
	100 MΩ	0.3 + 0.01		0.8 + 0.01		0.8 + 0.01	0.15 + 0.0002
	1 GΩ	1.0 + 0.01		1.5 + 0.01		2.0 + 0.01	0.6 + 0.0002

8845A Accuracy

Accuracy is given as ± (% measurement + % of range)

	Range	24 Hour		90 Days	1 Year	Temperature
						Coefficient/ °C
		(23 ±1 °C)		(23 ±5 °C)	(23 ±5 °C)
						Outside 18 to 28 °C
	100 Ω	0.003	+ 0.003	0.008 + 0.004	0.01 + 0.004	0.0006 + 0.0005
	1 kΩ	0.002	+ 0.0005	0.008 + 0.001	0.01 + 0.001	0.0006 + 0.0001
	10 kΩ	0.002	+ 0.0005	0.008 + 0.001	0.01 + 0.001	0.0006 + 0.0001
	100 kΩ	0.002	+ 0.0005	0.008 + 0.001	0.01 + 0.001	0.0006 + 0.0001
	1 MΩ	0.002	+ 0.001	0.008 + 0.001	0.01 + 0.001	0.0010 + 0.0002
	10 MΩ	0.015	+ 0.001	0.02 + 0.001	0.04 + 0.001	0.0030 + 0.0004
	100 MΩ	0.3 + 0.01		0.8 + 0.01	0.8 + 0.01	0.1500 + 0.0002

1-14

Introduction and Specifications

1

Electrical Specifications

Additional Ohms Errors

Digits

NPLC

Additional Noise Error

6½

100

0 % of range

6½

10

0 % of range

5½

1

0.001 % of range

5½

0.2

0.001 % of range ±20 mΩ

4½

0.02

0.01 % of range ±20 mΩ

DC Current

Input Protection .................................................... Tool-accessible 11 A/1000 V and 440 mA/1000 V fuses

Common Mode Rejection..................................... 140 dB at 50 or 60 Hz ±0.1 % (1 kΩ unbalance)

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 %

Input Characteristics

Range

Resolution

Resolution

Shunt Resistance

Burden Voltage

4½ Digits

5½ Digits

6½ Digits

(Ohms)

100 µA

100.0000 µA

10 nA

1 nA

100 pA

100 Ω

<0.015 V

1 mA

1.000000 mA

100 nA

10 nA

1 nA

100 Ω

<0.15 V

10 mA

10.00000 mA

1 μA

100 nA

10 nA

1 Ω

<0.025 V

100 mA

100.0000 mA

10 µA

1 μA

100 nA

1 Ω

<0.25 V

1 A

1.000000 A

100 µA

10 µA

1 μA

0.01 Ω

<0.05 V

3 A[1]

3.00000A

1 mA

100 µA

10 µA

0.01 Ω

<0.15 V

10 A

10.00000 A

1 mA

100 µA

10 µA

0.01 Ω

<0.5 V

[1] Part of 10 A range.

Accuracy (8846A)

Accuracy is given as ± (% measurement + % of range)

Temperature

Range

24 Hour

90 Days

1 Year

Coefficient/ °C

(23 ±1 °C)

(23 ±5 °C)

(23 ±5 °C)

Outside 18 to 28 °C

100 µA

0.01 + 0.02

0.04 + 0.025

0.05 + 0.025

0.002 + 0.003

1 mA

0.007 + 0.005

0.030 + 0.005

0.05 + 0.005

0.002 + 0.0005

10 mA

0.007 + 0.02

0.03 + 0.02

0.05 + 0.02

0.002 + 0.002

100 mA

0.01 + 0.004

0.03 + 0.005

0.05 + 0.005

0.002 + 0.0005

1 A[2]

0.03 + 0.02

0.04 + 0.02

0.05 + 0.02

0.005 + 0.001

3 A[1][2]

0.05 + 0.02

0.08 + 0.02

0.1 + 0.02

0.005 + 0.002

10 A[2]

0.1 + 0.008

0.12 + 0.008

0.15 + 0.008

0.005 + 0.0008

[1]Part of 10 A range

[2]Available at front panel connectors only

1-15

8845A/8846A

Calibration Manual

Accuracy (8845A)

Accuracy is given as ± (% measurement + % of range)

	Range		24 Hour		90 Days		1 Year	Temperature
								Coefficient/ °C
		(23 ±1 °C)		(23 ±5 °C)		(23 ±5 °C)
								Outside 18 to 28 °C
	100 µA	0.01	+ 0.02	0.04	+ 0.025	0.05	+ 0.025	0.002	+ 0.003
	1 mA	0.007 + 0.005		0.030 + 0.005		0.05	+ 0.005	0.002	+ 0.0005
	10 mA	0.007 + 0.02		0.03	+ 0.02	0.05	+ 0.02	0.002	+ 0.002
	100 mA	0.01	+ 0.004	0.03	+ 0.005	0.05	+ 0.005	0.002	+ 0.0005
	1 A[2]	0.03	+ 0.04	0.08	+ 0.02	0.05	+ 0.02	0.005	+ 0.001
	3 A[1][2]	0.05	+ 0.08	0.12	+ 0.02	0.1 + 0.02		0.005	+ 0.002
	10 A[2]	0.1 + 0.008		0.12	+ 0.008	0.15	+ 0.02	0.005	+ 0.0008

[1]Part of 10 A range

[2]Available at front panel connectors only

Additional Current Errors

Digits	NPLC	Additional Noise Error
6½	100	0 % of range
6½	10	0 % of range
5½	1	0.001 % of range
5½	0.2	0.001 % of range ±4 μA
4½	0.02	0.01 % of range ±4 μA

AC Current

The following ac current specifications are for sinusoidal signals with amplitudes greater than 5 % of range. For inputs from 1 % to 5 % of range, add an additional error of 0.1 % of range.

Input Protection ....................................................	Tool accessible 11 A/1000 V and 440 mA/1000 V fuses.
Measurement Method...........................................	ac-coupled true-rms, dc-coupled to the fuse and shunt (no blocking
	capacitor)
AC Filter Bandwidth
Slow ....................................................................	3 Hz to 10 kHz
Medium ...............................................................	20 Hz to 10 kHz
Fast.....................................................................	200 Hz to 10 kHz
Maximum Crest Factor .........................................	5:1 at full scale
Additional Crest Factor Errors (<100 Hz) ...........	Crest factor 1-2, 0.05 % of full scale
	Crest factor 2-3, 0.2 % of full scale
	Crest factor 3-4, 0.4 % of full scale
	Crest factor 4-5, 0.5 % of full scale

Input Characteristics

	Range	Resolution		Resolution		Shunt Resistance	Burden Voltage
			4½ Digits	5½ Digits	6½ Digits	(Ohms)
	100 μA[1]	100.0000 μA	10 nA	1 nA	100 pA	100 Ω	<0.015 V
	1 mA[1]	1.000000 mA	100 nA	10 nA	1 nA	100 Ω	<0.15 V
	10 mA	10.00000 mA	1 μA	100 nA	10 nA	1 Ω	<0.025 V
	100 mA	100.0000 mA	10 µA	1 μA	100 nA	1 Ω	<0.25 V
	1 A	1.000000 A	100 µA	10 µA	1 μA	0.01 Ω	<0.05 V
	3 A[2]	3.00000 A	1 mA	100 µA	10 μA	0.01 Ω	<0.05 V
	10 A	10.00000 A	1 mA	100 µA	10 µA	0.01 Ω	<0.5 V

[1] 8846A Only

[2] Part of 10 A range

1-16

Introduction and Specifications 1

Electrical Specifications

8846A Accuracy

Accuracy is given as ± (% measurement + % of range)

Range		Frequency	24 Hour	90 Days	1 Year		Temperature
							Coefficient/ °C
		(Hz)	(23 ±1 °C)	(23 ±5 °C)	(23	±5 °C)
							Outside 18 to 28 °C
100 μA	3 – 5 Hz		1.0 + 0.04	1.0 + 0.04	1.0 +	0.04	0.1 + 0.006
	5	– 10 Hz	0.3 + 0.04	0.3 + 0.04	0.3 +	0.04	0.035 + 0.006
	10 Hz – 5 kHz		0.1 + 0.04	0.1 + 0.04	0.1 + 0.04		0.015 + 0.006
	5	– 10 kHz	0.2 + 0.25	0.2 + 0.25	0.2 +	0.25	0.03 + 0.006
1 mA	3 – 5 Hz		1.0 + 0.04	1.0 + 0.04	1.0 +	0.04	0.1 + 0.006
	5	– 10 Hz	0.3 + 0.04	0.3 + 0.04	0.3 +	0.04	0.035 + 0.006
	10 Hz – 5 kHz		0.1 + 0.04	0.1 + 0.04	0.1 +	0.04	0.015 + 0.006
	5	– 10 kHz	0.2 + 0.25	0.2 + 0.25	0.2 +	0.25	0.03 + 0.006
10 mA	3 – 5 Hz		1.0 + 0.04	1.0 + 0.04	1.0 +	0.04	0.1 + 0.006
	5	– 10 Hz	0.3 + 0.04	0.3 + 0.04	0.3 +	0.04	0.035 + 0.006
	10 Hz – 5 kHz		0.1 + 0.04	0.1 + 0.04	0.1+ 0.04		0.015 + 0.006
	5	– 10 kHz	0.2 + 0.25	0.2 + 0.25	0.2 +	0.25	0.03 + 0.006
100 mA	3 – 5 Hz		1.0 + 0.04	1.0 + 0.04	1.0 +	0.04	0.1 + 0.006
	5	– 10 Hz	0.3 + 0.04	0.3 + 0.04	0.3 +	0.04	0.035 + 0.006
	10 Hz – 5 kHz		0.1 + 0.04	0.1 + 0.04	0.1 +	0.04	0.015 + 0.006
	5	– 10 kHz	0.2 + 0.25	0.2 + 0.25	0.2 +	0.25	0.03 + 0.006
1 A[2]	3 – 5 Hz		1.0 + 0.04	1.0 + 0.04	1.0 +	0.04	0.1 + 0.006
	5	– 10 Hz	0.3 + 0.04	0.3 + 0.04	0.3 +	0.04	0.035 + 0.006
	10 Hz – 5 kHz		0.1 + 0.04	0.1 + 0.04	0.1 +	0.04	0.015 + 0.006
	5	– 10 kHz	0.35 + 0.7	0.35 + 0.7	0.35 + 0.7		0.03 + 0.006
3 A[1][2]	3 – 5 Hz		1.1 + 0.06	1.1 + 0.06	1.1 +	0.06	0.1 + 0.006
	5	– 10 Hz	0.35 + 0.06	0.35 + 0.06	0.35 + 0.06		0.035 + 0.006
	10 Hz – 5 kHz		0.15 + 0.06	0.15 + 0.06	0.15 + 0.06		0.015 + 0.006
	5	– 10 kHz	0.35 + 0.7	0.35 + 0.7	0.35 + 0.7		0.03 + 0.006
10 A[2]	3 – 5 Hz		2.0 + 0.06	2.0 + 0.06	2.0 +	0.06	0.2 + 0.006
	5	– 10 Hz	1.1 + 0.06	1.1 + 0.06	1.1 +	0.06	0.1 + 0.006
	10 Hz – 5 kHz		0.15 + 0.06	0.15 + 0.06	0.15 + 0.06		0.015 + 0.006
	5	– 10 kHz	0.35 + 0.7	0.35 + 0.7	0.35 + 0.7		0.03 + 0.006

[1]Part of 10 A range

[2]Available only on front panel connectors

1-17

8845A/8846A

Calibration Manual

8845A Accuracy

Accuracy is given as ± (% measurement + % of range)

		Frequency	24 Hour		90 Days		1 Year			Temperature
Range										Coefficient/ °C
		(Hz)	(23 ±1 °C)		(23 ±5 °C)		(23		±5 °C)
										Outside 18 to 28 °C
10 mA	3 – 5 Hz		1.0 + 0.04		1.0 + 0.04		1.0 +		0.04	0.1 + 0.006
	5	– 10 Hz	0.3 + 0.04		0.3 + 0.04		0.3 +		0.04	0.035 + 0.006
	10 Hz – 5 kHz		0.1 + 0.04		0.1 + 0.04		0.1+ 0.04			0.015 + 0.006
	5	– 10 kHz	0.2 + 0.25		0.2 + 0.25		0.2 +		0.25	0.03 + 0.006
100 mA	3 – 5 Hz		1.0 + 0.04		1.0 + 0.04		1.0 +		0.04	0.1 + 0.006
	5	– 10 Hz	0.3 + 0.04		0.3 + 0.04		0.3 +		0.04	0.035 + 0.006
	10 Hz – 5 kHz		0.1 + 0.04		0.1 + 0.04		0.1 +		0.04	0.015 + 0.006
	5	– 10 kHz	0.2 + 0.25		0.2 + 0.25		0.2 +		0.25	0.03 + 0.006
1 A[2]	3 – 5 Hz		1.0 + 0.04		1.0 + 0.04		1.0 +		0.04	0.1 + 0.006
	5	– 10 Hz	0.3 + 0.04		0.3 + 0.04		0.3 +		0.04	0.035 + 0.006
	10 Hz – 5 kHz		0.1 + 0.04		0.1 + 0.04		0.1 +		0.04	0.015 + 0.006
	5	– 10 kHz	0.35	+ 0.7	0.35	+ 0.7	0.35	+ 0.7		0.03 + 0.006
3 A[1][2]	3 – 5 Hz		1.1 + 0.06		1.1 + 0.06		1.1 +		0.06	0.1 + 0.006
	5	– 10 Hz	0.35	+ 0.06	0.35	+ 0.06	0.35	+ 0.06		0.035 + 0.006
	10 Hz – 5 kHz		0.15	+ 0.06	0.15	+ 0.06	0.15	+ 0.06		0.015 + 0.006
	5	– 10 kHz	0.35	+ 0.7	0.35	+ 0.7	0.35	+ 0.7		0.03 + 0.006
10 A[2]	3 – 5 Hz		1.1 + 0.04		1.1 + 0.04		1.1 +		0.04	0.2 + 0.006
	5	– 10 Hz	0.35	+ 0.04	0.35	+ 0.04	0.35	+ 0.04		0.1 + 0.006
	10 Hz – 5 kHz		0.15	+ 0.04	0.15	+ 0.04	0.15	+ 0.04		0.015 + 0.006
	5	– 10 kHz	0.35	+ 0.7	0.35	+ 0.7	0.35	+ 0.7		0.03 + 0.006

[1]Part of the 10 A range

[2]Available only at front panel connectors

Additional Low Frequency Errors

Error is stated as % of reading.

		Frequency		AC Filter
			3HZ (slow)	20HZ (medium)	200HZ (fast)
10	– 20 Hz		0	0.25	–
20	– 40 Hz		0	0.02	–
40	– 100 Hz		0	0.01	0.55
100		– 200 Hz	0	0	0.2
200		Hz – 1 kHz	0	0	0.02
> 1 kHz			0	0	0

Frequency

Gate Times.............................................................	Programmable to 1 s, 100 ms, and 10 ms
Measurement Method...........................................	Flexible counting technique. AC-coupled input using the ac voltage
	measurement function.
Settling Considerations........................................	When measuring frequency or period after a dc offset voltage change,
	errors may occur. For the most accurate measurement, wait up to 1
	second for the input blocking capacitor to settle.
Measurement Considerations..............................	To minimize measurement errors, shield inputs from external noise
	when measuring low-voltage, low-frequency signals.

1-18

Introduction and Specifications 1

Electrical Specifications

8846A Accuracy

Accuracy is given as ± % measurement

			24 Hour	90 Days	1 Year	Temperature
	Range	Frequency				Coefficient/ °C
			(23 ±1 °C)	(23 ±5 °C)	(23 ±5 °C)
						Outside 18 to 28 °C
	100 mV to	3 – 5 Hz	0.1	0.1	0.1	0.005
	1000 V[1][2]
		5 – 10 Hz	0.05	0.05	0.05	0.005
		10 – 40 Hz	0.03	0.03	0.03	0.001
		40 Hz – 300 kHz	0.006	0.01	0.01	0.001
		300 kHz – 1 MHz	0.006	0.01	0.01	0.001

[1]Input >100 mV. For 10 – 100 mV, multiply percent measurement error by 10.

[2]Limited to 8 X 107 volt-Hertz

8845A Accuracy

Accuracy is given as ± % measurement

				24 Hour	90 Days	1 Year	Temperature
Range			Frequency				Compensation/ °C
				(23 ±1 °C)	(23 ±5 °C)	(23 ±5 °C)
							Outside 18 to 28 °C
100 mV to	3	– 5 Hz		0.1	0.1	0.1	0.005
[1][2]
750 V	5	– 10 Hz		0.05	0.05	0.05	0.005
	10		– 40 Hz	0.03	0.03	0.03	0.001
	40		Hz – 300 kHz	0.006	0.01	0.01	0.001

[1]Input >100 mV. For 10 – 100 mV, multiply percent measurement error by 10.

[2]Limited to 8 X 107 volt-Hertz

Gate Time vs. Resolution

Gate Time	Resolution
0.01	5½
0.1	6½
1.0	6½

1-19

8845A/8846A

Calibration Manual

Additional Low Frequency Errors

Error stated as percent of measurement for inputs >100 mV. For 10 – 100 mV, multiply percent by 10.

	Frequency		Resolution
		6½	5½	4½
	3 – 5 Hz	0	0.12	0.12
	5 – 10 Hz	0	0.17	0.17
	10 – 40 Hz	0	0.2	0.2
	40 – 100 Hz	0	0.06	0.21
	100 – 300 Hz	0	0.03	0.21
	300 Hz – 1 kHz	0	0.01	0.07
	> 1 kHz	0	0	0.02

Capacitance (8846A Only)

Accuracy is stated as ±(% of measurement + % of range)

	Range		Resolution	1 Year Accuracy[1]			Temperature Coefficient/ °C
				(23	±5	°C)	Outside 18 to 28 °C
1 nF		1 pF		2% ± 2.5 %			0.05 + 0.05
10 nF		10 pF		1% ± 0.5 %			0.05 + 0.01
100 nF		100 pF		1% ± 0.5 %			0.01 + 0.01
1 µF		1 nF		1% ± 0.5 %			0.01 + 0.01
10 µF		10 nF		1% ± 0.5 %			0.01 + 0.01
100 µF		100 nF		1% ± 0.5 %			0.01 + 0.01
1 mF		1 µF		1% ± 0.5 %			0.01 + 0.01
10 mF		10 µF		1% ± 0.5 %			0.01 + 0.01
100 mF		100 µF		4% ± 0.2 %			0.05 + 0.05

[1] Stated accuracy is attained when Zero function is used.

Temperature (8846A only)

Test Current........................................................... 1 mA

Accuracy is stated as ± °C and is based on a Platinum RT100 (DIN IEC 751, 385 type) RTD with less than 10 ohms lead resistance. The accuracy listed in the table below are valid only when using the 4-wire RTD measurement function. Specifications do not include probe accuracy, which must be added.

		Accuracy			Temperature
Range	Resolution			1 Year	Coefficient/ °C
		90 Days
		(23 ±5 °C)		(23 ±5 °C)	Outside 18 to 28 °C
-200 °C	0.001 °C	0.06		0.09	0.0025
-100 °C	0.001 °C	0.05		0.08	0.002
0 °C	0.001 °C	0.04		0.06	0.002
100 °C	0.001 °C	0.05		0.08	0.002
300 °C	0.001 °C	0.1		0.12	0.002
600 °C	0.001 °C	0.12		0.14	0.002

Continuity

Continuity Threshold............................................		Selectable between 1 Ω and 1000 Ω
Test Current...........................................................		1 mA
Response Time .....................................................		300 samples/sec with audible tone
Accuracy is given as ± (% measurements + % of range)
Range	24 Hour	90 Days	1 Year	Temperature
				Coefficient/ °C
	(23 ±1 °C)	(23 ±5 °C)	(23 ±5 °C)
				Outside 18 to 28	°C
1000.0 Ω	0.002 + 0.01	0.008 + 0.02	0.01 + 0.02	0.001 + 0.002

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