® 8845A/8846A Digital Multimeter Users Manual July 2006 © 2006 Fluke Corporation. All rights reserved. All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days.
Table of Contents Chapter 1 Title Page Introduction and Specifications......................................................... 1-1 Introduction........................................................................................................ Manual Set ......................................................................................................... About this Manual ............................................................................................. Safety Information ...........
8845A/8846A Users Manual Diode Test ..................................................................................................... 1-20 Measurement Rates ....................................................................................... 1-20 2 Preparing the Meter for Operation ..................................................... 2-1 Introduction........................................................................................................ Unpacking and Inspecting the Meter ..........
Contents (continued) Configuring the Remote Interface ..................................................................... 3-22 Checking the Meter’s Calibration Date ............................................................. 3-22 Resetting the Meter’s Default Settings .............................................................. 3-22 4 Making Measurements ........................................................................ 4-1 Introduction..........................................................
8845A/8846A Users Manual iv
List of Tables Table 1-1. 1-2. 1-3. 1-4. 1-3. 2-1. 2-2. 3-1. 3-2. 3-3. C-1. Title Safety Information ................................................................................................. Safety and Electrical Symbols................................................................................ Volatile Memory Space.......................................................................................... Non-volatile Memory Space ...............................................................
845A/8846A Users Manual vi
List of Figures Figure 2-1. 2-2. 2-3. 2-4. 3-1. 3-2. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. Title Replacing the Line Fuse......................................................................................... Replacing the Current Input Fuses ......................................................................... Line Power Cords Types Available from Fluke..................................................... Bail Adjustment and Removal ............................................................
8845A/8846A Users Manual viii
Chapter 1 Introduction and Specifications Title Page Introduction........................................................................................................1-3 Manual Set .........................................................................................................1-3 About this Manual .............................................................................................1-4 Safety Information .................................................................................
8845A/8846A Users Manual Diode Test .....................................................................................................1-20 Measurement Rates .......................................................................................
Introduction and Specifications Introduction 1 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.
8845A/8846A Users Manual About this Manual This is the Users Manual for the 8845A and 8846A Digital Multimeters (hereafter referred to as the Meter). It contains all of the information a new user will need to operate the Meter effectively. The manual is divided into the following chapters: Chapter 1 “Introduction and Specifications” provides information on how to safely use the Meter, standard and optional accessories, and specifications.
Introduction and Specifications Safety Information 1 Table 1-1. Safety Information XW Warning 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.
8845A/8846A Users Manual Symbols Table 1-2 is a list of safety and electrical symbols that appear on the Meter or in this manual. Table 1-2. Safety and Electrical Symbols Symbol Description W Risk of danger. Important information. See manual X Hazardous voltage.
Introduction and Specifications Accessories 1 Non Volatile Memory Table 1-4 lists the Meter’s non-volatile memory elements. Table 1-4. Non-volatile Memory Space Type Size Function Flash 128 MB Application program storage, user string, user data, user remote interface settings. Flash 4 MB FPGA hardware setup, application program storage, calibration constants. To clear the 128 MB of non-volatile flash memory listed in Table 1-4: 1. Press M. 2. Select the MANAGE MEMORY soft key. 3.
8845A/8846A Users Manual Table 1-3. Accessories (cont) Model/Fluke PN 1-8 Description TL910 Precision Electronic Probe Set TL80A Basic Electronic DMM Test Set TL2X4W-PT 2X4 Wire Ohms Test Lead TL2X4W-TWZ 2X4 Wire Ohms SMD Test Tweezer 6262-02 Test Probe Tip Adapter, Extended Fine Point 6263-02 Test Probe Tip Adapter, IC Probe Tip 803293 Fuse, 11 A, 1000 V, Fast, 406INX1.5IN, Buik 943121 Fuse, 440 mA, 1000 V, Fast, 406X1.
Introduction and Specifications General Specifications 1 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 ...............................................................
8845A/8846A Users Manual Memory 8845A ................................................................. 10,000 measurements, Internal only 8846A ................................................................. 10,000 measurements, Internal and up to 2 Gigabyte capacity with USB memory module (available separately.
Introduction and Specifications Electrical Specifications 1 8846A Accuracy Accuracy is given as ± (% measurement + % of range) 24 Hour (23 ± 1 °C) 90 Days (23 ± 5 °C) 1 Year (23 ± 5 °C) Temperature Coefficient/ °C Outside 18 to 28 °C 100 mV 1V 0.0025 + 0.003 0.0018 + 0.0006 0.0025 + 0.0035 0.0018 + 0.0007 0.0037 + 0.0035 0.0025 + 0.0007 0.0005 + 0.0005 0.0005 + 0.0001 10 V 100 V 1000 V 0.0013 + 0.0004 0.0018 + 0.0006 0.0018 + 0.0006 0.0018 + 0.0005 0.0027 + 0.0006 0.0031 + 0.001 0.0024 + 0.
8845A/8846A Users Manual Input Characteristics Resolution 5½ Digits Range Full Scale (6½ Digits) 100 mV 100.0000 mV 10 µV 1 µV 100 nV 1V 10 V 100 V 1000 V 1.000000 V 10.00000 V 100.0000 V 1,000.
Introduction and Specifications Electrical Specifications 1 8845A Accuracy Accuracy is given as ± (% measurement + % of range) Frequency (Hz) Range 100 mV 1V 10 V 1 Year (23 ± 5 °C) Temperature Coefficient/ °C Outside 18 to 28 °C 1.0 + 0.03 0.35 + 0.03 1.0 + 0.04 0.35 + 0.04 1.0 + 0.04 0.35 + 0.04 0.10 + 0.004 0.035 + 0.004 10 Hz – 20 kHz 20 – 50 kHz 50 – 100 kHz [1] 100 – 300 kHz 3 – 5 Hz 5 – 10 Hz 10 Hz – 20 kHz 0.04 + 0.03 0.1 + 0.05 0.55 + 0.08 4.0 + 0.50 1.0 + 0.02 0.35 + 0.02 0.04 + 0.
8845A/8846A Users Manual 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. Input Characteristics Full Scale (6½ Digits) Range 10 Ω [1] 10.00000 Ω 100 Ω 100.0000 Ω 1 kΩ 1.000000 kΩ 10 kΩ 10.00000 kΩ 100 kΩ 100.
Introduction and Specifications Electrical Specifications 1 DC Current Input Protection .................................................... Tool-accessible 11 A/1000 V and 440 mA/1000 V fuses. Input Characteristics Full Scale (6½ Digits) Range 4½ Digits Resolution 5½ Digits 6½ Digits Shunt Resistance Burden Voltage (Ohms) 100 µA 100.0000 µA 10 nA 1 nA 100 pA 100Ω 1 mA 1.000000 mA 100 nA 10 nA 1 nA 100Ω 10 mA 10.00000 mA 100 nA 10 nA 1Ω <0.025 V 100 mA 100.
8845A/8846A Users Manual 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 ...........................................
Introduction and Specifications Electrical Specifications 1 8846A Accuracy (cont) 3A [1][2] 10 A [2] 3 – 5 Hz 1.1 + 0.06 1.1 + 0.06 1.1 + 0.06 5 – 10 Hz 0.35 + 0.06 0.35 + 0.06 0.35 + 0.06 0.1 + 0.006 0.035 + 0.006 10 Hz – 5 kHz 0.5 + 0.7 0.15 + 0.06 0.15 + 0.06 0.015 + 0.006 5 – 10 kHz 3 – 5 Hz 0.35 + 0.7 2.0 + 0.06 0.35 + 0.7 2.0 + 0.06 0.35 + 0.7 2.0 + 0.06 0.03 + 0.006 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.
8845A/8846A Users Manual 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.
Introduction and Specifications Electrical Specifications 1 Capacitance (8846A Only) Accuracy is stated as ±(% of measurement + % of range) [1] Range Temperature Coefficient/ °C Outside 18 to 28 °C 1 Year Accuracy (23 ± 5 °C) Resolution 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.
8845A/8846A Users Manual Diode Test Test Current........................................................... 100 µA or 1 mA Response Time ..................................................... 300 samples/sec with audible tone. Accuracy is given as ± (% measurements + % of range) 24 Hour (23 ± 1 °C) 90 Days (23 ± 5 °C) 0.002 + 0.002 0.002 + 0.001 0.008 + 0.002 0.008 + 0.002 Range 5.0000 V 10.0000 V 1 Year (23 ± 5 °C) 0.01 + 0.002 0.01 + 0.002 Temperature Coefficient/ °C Outside 18 to 28 °C 0.001 + 0.
Chapter 2 Preparing the Meter for Operation Title Introduction........................................................................................................ Unpacking and Inspecting the Meter ................................................................. Contacting Fluke................................................................................................ Storing and Shipping the Meter ......................................................................... Power Considerations ...
8845A/8846A Users Manual 2-2
Preparing the Meter for Operation Introduction 2 Introduction This chapter explains how to prepare the Meter for operation by selecting the proper line voltage, connecting an appropriate line power cord, and turning on the Meter. Also included is information on the proper storage and cleaning of the Meter. Unpacking and Inspecting the Meter Every care is taken in the choice of packing material to ensure that your equipment will reach you in perfect condition.
8845A/8846A Users Manual does not match the power the Meter will be plugged into, then the Meter’s line voltage setting must be changed and the line fuse possibly replaced. Selecting the Line Voltage The Meter will operate on any one of four different input line voltages. The set line voltage is visible through the window in the line fuse holder, found on the Meter’s rear panel. To change the line voltage: 1. Remove the power cord from the Meter. 2.
Preparing the Meter for Operation Power Considerations 2 Table 2-1. Line Voltage to Fuse Rating Line Voltage Selection Fuse Rating Fluke Part No. 100 0.25 A, 250 V (slow blow) 166306 120 0.25 A, 250 V (slow blow) 166306 220 0.125 A, 250 V (slow blow) 166488 240 0.125 A, 250 V (slow blow) 166488 120 caw0201f.eps Figure 2-1. Replacing the Line Fuse Current-Input Fuses The 100 mA and 10 A inputs are protected by user-replaceable fuses.
8845A/8846A Users Manual If the fuse is good, the Meter will read less than 1 Ω. If the fuse is blown, the Meter will read overload. To replace the Current Input fuses, 1. Turn the Meter off, unplug the power cord from the Meter, and remove all test leads. 2. Turn the Meter on its back. 3. Unscrew the retaining screw on the fuse access door as depicted in Figure 2-2. 4.
Preparing the Meter for Operation Connecting to Line Power 2 Connecting to Line Power XWWarning To avoid shock hazard, connect the factory supplied threeconductor line power cord to a properly grounded power outlet. Do not use a two-conductor adapter or extension cord; this will break the protective ground connection.
8845A/8846A Users Manual Turning Power-On XW Warning To avoid electric shock, connect the Meter’s power cord to a power receptacle with proper earth ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation. With the proper line voltage selected and the appropriate power cord connected to the Meter, connect the power cord to a power outlet and switch rear-panel power switch so the “I” side of the switch is depressed.
Preparing the Meter for Operation Cleaning the Meter 2 Cleaning the Meter XW Warning To avoid electric shock or damage to the Meter, never get water inside the meter. W Caution To avoid damaging the Meter’s housing, do not apply solvents to the Meter. If the Meter requires cleaning, wipe it down with a cloth lightly dampened with water or a mild detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or methanolbased fluids when wiping down the meter.
8845A/8846A Users Manual 2-10
Chapter 3 Front-Panel Operation Title Introduction........................................................................................................ Controls and Indicators ...................................................................................... Front-Panel Feature Descriptions .................................................................. Display Panel................................................................................................. Rear-Panel Connectors ...........
8845A/8846A Users Manual Setting the Meter’s Date and Time................................................................ Configuring the Remote Interface ..................................................................... Checking the Meter’s Calibration Date ............................................................. Resetting the Meter’s Default Settings ..............................................................
Front-Panel Operation Introduction 3 Introduction The Meter can be controlled either by sending commands through one of its communication interfaces or by manual manipulation of its front panel controls. This chapter explains the function and use of the controls and indicators located on the front and rear panels of the Meter. Operating the Meter through its computer interfaces is covered in the Programmers Manual.
8845A/8846A Users Manual B Sense HI and LO connectors. Output connectors to source current for 4-wire Ohms measurements. C Soft keys F1 through F5. Soft keys are used to select various menu options while navigating the Meter’s menus. Each soft key’s function is identified with a label in the bottom row of the display. Keys without a label above them are inactive D Memory key for accessing internal and external memory[1] containing meter setups and measurements.
Front-Panel Operation Controls and Indicators 3 Table 3-2. Display Elements mV 1 V 12 2 11 100.0002 10 -0.4561 9 8 ... 123.123. -- Hz 3 4 mV~ 123.123. 5 6 ENTER 7 caw02f.eps Item Description A Primary display. B Secondary display. C Indicates PASS, HIGH or LOW for limits testing. D Math function selected. E Error detected. F Memory enabled for storing readings. Extinguishes when last sample is stored. G Soft key key labels. H Manual range mode selected.
8845A/8846A Users Manual Rear-Panel Connectors Table 3-3 indicates the connections on the rear panel and describes their use. Table 3-3. Rear-Panel Conncetors 1 2 3 4 1/4 A SLOW FUSE,100/120 VAC 1/8 A SLOW FUSE, 220/240 VAC INPUT 47 - 440 Hz 25 VA MAX SENSE 4W V CAUTION: FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE AS STATED IN MANUAL.
Front-Panel Operation Navigating the Front-Panel Menu 3 Adjusting the Meter’s Range The range keys, (URV), switch the Meter between auto and manual ranging. The presence or absence of MAN in the display indicates the Meter’s range mode. All functions utilize these keys to control the Meter’s range except continuity, diode test, temperature (8846A only), frequency and period, which only have a single range.
8845A/8846A Users Manual The soft key labels are updated with five choices. 4 DIGIT .02 PLC 5 DIGIT .2 PLC 5 DIGIT 1 PLC 6 DIGIT 10 PLC 6 DIGIT 100 PLC These choices determine the displayed resolution (4½, 5½, and 6½ digits) and the measurement cycle time in reference to the power ling frequency in cycles (PLC) For example, selecting 5 DIGIT 1 PLC will display 5½ digit resolution and take a measurement once for each power line cycle. For 60 Hz power, a measurement is made once every 60th of a second.
Front-Panel Operation Using the Analyze Functions 3 Refer to the “Testing Continuity” section in Chapter 4 to test continuity. Setting the Diode Test Voltage and Current To set the diode test current: 1. Press S twice on the 8846A , or press D once on the 8845A, to select the Diode function. 2. Press the 1mA or 0.1mA soft key to set the diode test current. 3. Press the 5V or 10V soft key to set the diode test voltage. Refer to the “Checking Diodes” section in Chapter 4 to check diodes.
8845A/8846A Users Manual Collecting Statistics on Measurements The statistical analysis function displays the minimum and maximum measurements of a series of Meter measurements. The Meter also calculates an average and a standard deviation value for the same measurement series. This function also provides control over the starting and stopping of the measurement series. Starting the Measurement Collection To start the statistics process: 1. Press J to display the Meter’s analysis menu. 2.
Front-Panel Operation Using the Analyze Functions 3 2. Press ENTER to set the number of samples. Note Setting the number of samples to zero will cause the Meter to collect samples continuously. Testing Using Limits The limits function provides Pass/Fail testing to user specified upper and lower limits. The upper and lower limits are stored in volatile memory and will be set to zero when the Meter is first turned on or the meter receives a reset through the remote interface.
8845A/8846A Users Manual Setting an Offset Value The offset function provides a means of displaying the difference between a measured value and a stored offset value. This type of measurement is referred to as a relative measurement. There are two methods of entering an offset value into the Meter. The first method is to enter a specified number into the offset register either through the front-panel or over the remote interface. Previously stored values are replaced with the new value.
Front-Panel Operation Using the Analyze Functions 3 To enter the B value: 7. Press the B soft key. To select the digit to adjust, press either <-- or -->. With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character. The right most character is the multiplier. This character can be set to p, n, µ, m, k, M, or G. 8. Press the ENTER soft key. 9. Press B to return to the MX+B menu. 10. Press the ENABLE soft key to start MX+B calculations.
8845A/8846A Users Manual As shown in Figure 3-1, the display will start plotting the readings across the plot area, and the maximum, minimum, and elapsed time are displayed. STOP F1 F2 F3 F4 F5 caw057.eps Figure 3-1. TrendPlot Display To stop the TrendPlot session, press B or the STOP soft key. To start the TrendPlot session over, press the STOP soft key followed by the RESTART soft key.
Front-Panel Operation Controlling Trigger Functions 3 The display will start adjusting the bar graph as the number of readings accumulates. The mean and standard deviation values also change in accordance with the collected readings. To start the histogram session over, press the STOP soft key followed by the RESTART soft key. To stop the histogram session, press B or the STOP soft key.
8845A/8846A Users Manual each trigger or pulse received, the Meter will take the specified number of measurements after the specified trigger delay. Note The trigger key is disabled whenever the Meter is in Remote mode. To set up for an external trigger: 1. Press L. 2. Press the soft key labeled TRIGGER. 3. Press the soft key labeled EXT TRIG. The Ext Trig soft key label will remain highlighted to indicate the Meter is in external trigger mode. To return to auto trigger mode, press EXT TRIG again.
Front-Panel Operation Controlling Trigger Functions 3 With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the digit. 5. With the desired delay set, press the soft key labeled ENTER. Understanding the Measurement Complete Signal The trigger port on the Meter’s back panel provides a low-true pulse at the completion of each Meter measurement. See the specifications section for more details on this signal.
8845A/8846A Users Manual Note For internal storage of readings, the number of readings stored will not exceed 9999 readings regardless of the value set for number of samples. To store readings in external memory (8846A Only) 1. Press M. 2. Press the STORE READINGS soft key. 3. Press the USB soft key. 4. Press the # SAMPLES soft key. 5. To adjust the number of samples, press either <-- or --> to select a digit.
Front-Panel Operation Controlling Trigger Functions 3 To store a meter configuration in the Meter’s internal memory: 1. Press M. 2. Press the STORE CONFIG soft key as shown below. + F1 0.5993 F2 F3 F4 F5 caw033.eps 3. Press the STORE INT MEM soft key. 4. Press one of the five soft keys labeled with the desired memory location to store the present Meter configuration. To store a meter configuration in to optional external memory (8846A Only): 1. Press M. 2. Press the STORE CONFIG soft key. 3.
8845A/8846A Users Manual 1. Press M. 2. Press the RECALL CONFIG soft key. 3. Press the RECALL USB soft key. The Meter labels the first four soft keys with the first four memory locations. CONFIG01 through CONFIG04. The fifth soft key is labeled MORE to allow access to all 100 memory locations. 4. To recall the Meter configuration from one of the first four memory locations, press the appropriately labeled soft key. If you want a memory location other than the first four locations, press the MORE soft key.
Front-Panel Operation Controlling System-Related Operations 3 Controlling System-Related Operations Identifying Meter Errors When the Meter detects an error, the error annunciator (item 5 in Table 3-2) is illuminated, and the beeper sounds. A list of possible Meter errors can be found in Appendix B of this manual. To read the error or errors: 1. Press I. 2. Press SYSTEM. 3. Press ERROR. 4. The first error, if there is more than one, is displayed. To read additional errors, press NEXT.
8845A/8846A Users Manual 4. To adjust the display to the desired date and time, press either <-- or --> to select a specific digit or the month. With the desired digit or month selected, press the soft key labeled -- to decrement the digit, or ++ to increment the digit. 5. Press the ENTER soft key to set the date and time and return to system menu.
Chapter 4 Making Measurements Title Introduction........................................................................................................ Selecting Function Modifiers............................................................................. Activating the Secondary Display ..................................................................... Measuring Voltage............................................................................................. Measuring DC Voltage.................
8845A/8846A Users Manual 4-2
Making Measurements Introduction 4 Introduction XWWarning To avoid possible electrical shock, and/or damage to the Meter, • Read the safety information found in Chapter 1 before operating this meter. • Do not apply more than 1000 volts between any terminal and earth ground. This chapter covers the steps for making a measurement with each of the Meter’s functions.
8845A/8846A Users Manual Measuring Voltage The Meter is capable of measuring up to 1000 V dc, 750 V ac (8845A) or 1000 V ac (8846A). WCaution To avoid blowing the current fuses and possible damage to other equipment, do not apply voltage to the meter’s input until the test leads are properly connected to the input, and the proper voltage function selected. Measuring DC Voltage To make a dc voltage measurement: 1. Press E.
Making Measurements Measuring Voltage 4 key label is highlighted and will increase stabilization time or the measurement. 2ND MEAS Cycles the secondary display through the measurement functions listed below, and then off. When a second measurement function is selected, the 2ND MEAS soft key label is highlighted. VAC - Displays the ac signal riding on the measured dc voltage. See the “Range Keys” section in Chapter 1 to learn how to switch between auto and manual ranging.
8845A/8846A Users Manual accommodate the various impedances that a dBm measurement can be made across, the Meter allows for the selection of 21 different impedance values. To set the dB reference impedance: 1. Press L. 2. Press the soft key labeled dBm REF. The available impedance settings are presented in sets of three values. To move to a higher set of impedance values, press ++ -->. Press <-- -- to go to a lower set of impedance values. 3.
Making Measurements Measuring Resistance 4 Note Each press of G switches the measurement between frequency and period. Function modifiers: APERTURE Displays three different gate time selections: 0.01, 0.1 and 1 second. These selections set the minimum amount of time the Meter takes to measure frequency. Shorter gate times result in lower measurement resolution. 2ND MEAS Cycles the secondary display through the measurement functions listed below, and then off.
8845A/8846A Users Manual Making a Four-Wire Resistance Measurement The Meter incorporates two methods of making a four-wire resistance measurement. The traditional method is to use four meter leads to connect the Meter to the resistance to be measured. The optional 2X4 Wire test leads simplifies the four-wire measurement so you only have to plug in two test leads to the Input HI and LO connectors of the meter. To make a four-wire resistance measurement using four test leads: 1.
Making Measurements Measuring Current INPUT 4 SENSE 4W V 2W/4W 2 HI HI 1000 V CAT I 600V CAT II 300V LO LO 1V FUSED 100 mA Ground tab 10A REAR FRONT caw060.eps Figure 4-3. Input Connections for 4-wire ohms using 2x4 wire leads. Function modifiers: FILTER An 8 Hertz filter is inserted to stabilize the measurement. The filter is active when this soft key’s label is highlighted.
8845A/8846A Users Manual I < 100 mA INPUT SENSE 4W V 2W/4W 2 HI HI 1000 V CAT I 600V CAT II 300V LO LO 1V FUSED V AC 100 mA 10A FRONT REAR caw025.eps Figure 4-4. Input Connections for Current Measurements Below 120 mA I > 100 mA and I < 10 A INPUT SENSE 4W V 2W/4W 2 HI HI 1000 V CAT I 600V CAT II 300V LO LO 1V FUSED 100 mA V AC 10A REAR FRONT caw026.eps Figure 4-5.
Making Measurements Measuring Current 4 0.0086 F1 F2 F3 F4 F5 caw09f.eps 3. With the test leads connected to the 100 mA and Input LO connectors, press the mA soft key as shown above, if not already highlighted. If the test leads are connected to the 10A and Input LO connectors, then press the 10A soft key. 4. Apply power to the measured circuit and read the current in the Meter’s display.
8845A/8846A Users Manual cycle time is longer than it is when using the 20 Hz filter. 20HZ Provides higher measurement accuracy on ac signals between 20 Hz and 200 Hz. However, the measurement cycle time is longer than it is when using the 200 Hz filter. 200 HZ Provides accurate measurements on ac signals 200 Hz and above. 2ND MEAS Cycles the secondary display through the measurement functions listed below, and then off.
Making Measurements Measuring RTD Temperature (8846A only) 4 Refer to the “Range Keys” section in Chapter 3 of this manual for information on how to adjust the measurement range. Measuring RTD Temperature (8846A only) The Fluke 8846A is capable of measuring temperatures between -200 °C and 600 °C using Resistance Temperature Detectors (RTDs). To make a temperature measurement: 1. Connect the RTD to the Input HI, and LO, then the SENSE HI and LO connectors as shown in Figure 4-7.
8845A/8846A Users Manual OHMS - Displays the resistance of the RTD. 2-wire resistance is used when in 2-wire temperature mode and 4-wire resistance when the Meter is in 4-wire RTD mode. Testing Continuity Continuity testing determines whether a circuit is intact (i.e., has a resistance less than the threshold). The threshold is selectable between 1 and 1000 Ω. To perform a continuity test: 1. Press S on the 8846A or Q on the 8845A. An example of the continuity display is shown below.
Making Measurements Making a Triggered Measurement + F1 4 0.5994 F2 F3 F4 F5 caw13f.eps 2. Select the test voltage and current appropriate for the diode being tested by pressing the associated soft keys. 3. Connect the test leads as shown in Figure 4-8. INPUT SENSE 4W V 2W/4W 2 HI HI 1000 V CAT I 600V CAT II 300V LO LO 1V FUSED 100 mA 10A REAR FRONT caw024.eps Figure 4-8.
8845A/8846A Users Manual Setting the Trigger Mode The Meter’s measurement cycle can be initiated either by the internal measurement circuit or by external stimulus. To select the trigger mode: 1. With the measurement setup menu displayed, press the soft key labeled TRIGGER. If EXT TRIG is highlighted, the Meter’s measurement cycle is triggered externally either through the external trigger jack on the rear panel, or the trigger key on the front panel.
Making Measurements Monitoring the Measurement-Complete Signal 4 Connecting an External Trigger The TRIG I/O jack on the Meter’s rear panel is used to connect to an external trigger signal. The rising edge of a TTL signal will trigger the Meter to start taking measurements, if the Meter is in external trigger mode. Figure 4-9 indicates the purpose of the three pins in the TRIG I/O connector. TRIG I/O Pin 1: Trigger In Pin 3: Measure Complete Out Pin 2: Signal Ground caw059.eps Figure 4-9.
8845A/8846A Users Manual 4-18
Appendices Appendix A B C Title Page 2X4 Test Leads ................................................................................................... A-1 Errors................................................................................................................... B-1 RS-232 Port Connections ....................................................................................
8845A/8846A Users Manual
Appendix A 2X4 Test Leads Introduction The optional Fluke TL2X4W test leads simplify making 4-wire ohms measurements by integrating the Hi-Hi Sense and Lo-Lo Sense test leads into one cable. The Meter’s Input HI and LO jacks consist of two contacts. One contact is connected to HI or LO input circuits and the other contact is connected to the Sense input circuits. Like the input jacks, the 2x4 test lead also has two contacts that align with the input jack contacts to provide a four wire connection.
8845A/8846A Users Manual A-2
Appendix B Errors Introduction Listed below are the error messages the Meter uses to indicate a problem. AC Line frequency too high Invalid calibration step number *TRG/GET received but was ignored 488.2 I/O deadlock 488.2 interrupted query 488.2 query after indefinite response 488.
8845A/8846A Users Manual CALibration:DATE not supported for the 8846A Can't get 1V/10V DC linearization constants CCO constant name is bad Character string was more than 12 characters Command not allowed in local Command only allowed in RS-232/Ethernet Could not open guard crossing port Could not open measurement file on USB device Could not open the ethernet port Could not save configuration Could not save MAC address Could not save network configuration Data stale Error occurred reading characters from E
Appendices Errors B Incorrect packet size from inguard Info packet rec'd; link not active Inguard Calibration Constant write failed Inguard not responding (recv) Inguard not responding (send) INITiate received but was ignored Instrument configuration load failed Instrument configuration store failed Insufficient memory Invalid dimensions in a channel list Invalid parameter Invalid parameter Invalid response type from inguard Invalid secure code Invalid string data Invalid suffix in command header Line too
45A/8846A Users Manual Serial buffer full Someone forgot to call begin (cal) Someone forgot to call begin (ICONF) Someone forgot to call begin (MCONF) Store reading to file failed String size is beyond limit Suffix Error.
Appendix C RS-232 Port Connections Introduction Table C-1 lists the pins and related signals available through the RS-232 port. Table C-1. RS-232 Pin to Signal List Pin Name Usage 1 DCD 2 RX Receive data 3 TX Transmit data 4 DTR Not used 5 GND Signal ground 6 DSR Not used 7 RTS Request to send 8 CTS Clear to send 9 RI Not used Not used The Meter’s RS-232 control lines can be rewired to an alternate pairing instead of the RTS/CTS control pair.
8845A/8846A Users Manual C-2
Index —A— —D— AC Voltage Measurements, 4-5 Analyze functions Histogram, 3-14 Math Limits testing, 3-10 MX+B, 3-12 Offset, 3-11 Statistics, 3-9 TrendPlot, 3-13 Date, setting of, 3-21 DC Voltage Measurements, 4-4 Defaults, resetting of, 3-22 Diode Test checking of, 4-14 setting compliance voltage, 3-8 setting of current, 3-8 Display Brightness, setting of, 3-21 Panel elements, 3-4 Resolution, Setting of, 3-7 —B— Bail adjustment of, 2-8 removal of, 2-8 —C— Calibration date checking of, 3-21 Capacitance m
8845A/8846A Users Manual Line-Power, 2-4 —H— Historgram, 3-14 —I— Input Impedance, Automatic, 3-9 Inspecting Meter, 2-3 —K— Keys Range, 3-6 Soft, 3-4 Soft, labels for, 3-5 —L— Limits Testing setting of limits, 3-11 Using, 3-10 Line Voltage Selection, 2-4 —M— Manual set, 1-3 Math functions Limits testing, 3-10 MX+B, 3-12 Offset, 3-11 Math Operations, 3-9 Measurement Complete Monitoring of, 4-17 Understanding of, 3-16 Measurements AC current, 4-11 AC Voltage, 4-5 Capacitance, 4-12 Current, 4-9 DC curren
Index (continued) Setting the mode, 4-16 Triggered Measurement, 4-15 Turning power on, 2-8 —U— —V— Voltage AC measurements, 4-5 DC measurements, 4-4 Unpacking Meter, 2-3 User documentation, 1-3 3
