Fluke 45 Service Requests IEEE-488 Only and Status Registers, Trigger Type, Rear Trigger

Page 69

Operating the Meter Using the Computer Interface

5

Service Requests (IEEE-488 Only and Status Registers

A measurement is triggered while the input is greater than +3 V. A method for using DTR (pin 4) and an external switch to trigger a measurement is shown in Figure 5-2.

•Send the IEEE-488 GET interface message (IEEE-488 Operations).

Table 5-3. Trigger Type

Type

1

2

3

4

5

Trigger

Internal

External

External

External

External

Rear Trigger

Disabled

Disabled

Disabled

Enabled

Enabled

Settling Delay

—

Off

On

Off

On

Table 5-4. RS-232 and IEEE-488 Reading Transfer Rates

Readings per Second

RATE

Slow

Medium

Fast

Internal Trigger Operation

(Trigger 1)

2.5

4.5

4.5

Internal Trigger Operation

(Trigger 4)

1.5

2.4

3.8

DTR (PIN 4)

RX (PIN 2)

TRIGGER TO ∝ P

aam20f.eps

Figure 5-2. External Trigger Using Receive Pin (RX) of RS-232 Interface

Service Requests (IEEE-488 Only and Status Registers

Service requests let a meter on the IEEE-488 bus get the attention of the host. Service requests are sent over the service request (SRQ) bus line.

Note

If the meter is in the remote state without front panel lockout (i.e., REMS), a service request can be sent from the front panel by pressing U.

If more than one instrument on the bus is capable of sending service requests, the host can determine which instrument made the request by taking a "serial poll." Each instrument on

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Contents Dual Display Multimeter Limited Warranty & Limitation of Liability Declaration of the Manufacturer or Importer Table of Contents Applications Appendices List of Tables Page List of Figures Introducing the Fluke 45 Dual Display Multimeter IntroductionOptions and Accessories Where to go from HereModel Accessories Description Maintenance Appendices Page Multimeter Safety Getting Started IntroductionFront Panel Turning the Meter on Using the PushbuttonsSummary of Basic Pushbutton Operations Selecting a Measurement Range Automatic Input Terminal SelectionTaking Some Basic Measurements Diode/Continuity Testing Measuring Voltage, Resistance, or FrequencyMeasuring Current Freq Continuity Testing Rack Mounting Operating the Meter Under Battery Power OptionalPage Front Panel Operations Operating the Meter From the Front PanelDisplay Primary DisplaySecondary Display Remote SMF Input Terminals Input TerminalsRanging Selecting a Measurement FunctionAutoranging Input LimitsFunction Buttons Ohms Ranges and Full Scale Values Fast Reading Rate Slow Reading Rate Range Full ScaleMedium Reading Rate Range Full Scale Frequency Ranges and Full Scale Values Slow and MediumMeasuring Frequency Manual RangingFrequency Ranging Measuring Frequency of Current 100 mA and 10A Inputs Frequency Measurement RatesFrequency Sensitivity Selection Frequency Measurement RatesSelecting a Function Modifier Maximum Sinewave Inputs for Frequency Measurements RangeMaximim Input Voltage Function Modifier Selection Buttons REL Relative Readings ModifierReference Impedances in Ohms DB Decibels and Audio Power ModifierUsing Function Modifiers in Combination Hold Touch Hold ModifierMN MX Minimum Maximum Modifier Selecting a Measurement Rate Rate Using the SButton10. SButton Operations PushbuttonsList and Number Editors Using The Compare Comp FunctionUsing the List Editor Using the Number Editor Power-Up Configuration Factory Settings of Power-Up ConfigurationChanging the Power-Up Configuration 13. Power-Up Configuration Set at Factory Parameter ConfigurationsCalibration Applications Using the Dual DisplayDual Display Showing Volts AC and Frequency Using Measurement Functions in CombinationApplications Sample Dual Display Applications Primary DisplayResponse Times DC Voltage and DC Current Measurement on Input SignalHow the Meter Makes Dual Display Measurements Slow Med Fast Slow Rate Auto Single Range1 Range2 Medium Rate Fast RateExternal Trigger Update Rate in the Dual Display ModeAll Thermal VoltagesTwo-Wire Configuration When Measuring ResistanceTrue RMS Measurements Correcting for Test Lead ResistanceEffects of Internal Noise in AC Measurements Calculated AC + DC RMS MeasurementsWaveform Comparison True RMS vs. Average-Responding Meters True RMS Measurements Page Computer Interfaces Local and Remote OperationsFactory Settings of RS-232 Communication Parameters Setting Communication Parameters RS-232Factory Setting Preparing the Meter for Operations via the RS-232 InterfaceRS-232 Print-Only Mode Cabling the Meter to a Host or Printer RS-232 Device Clear Using C Cntrl CCharacter Echoing and Deletion RS-232 PromptsPreparing the Meter to be Operated via IEEE-488 Interface Installing the IEEE-488 InterfaceIEEE-488 Operating Limitations Enabling the IEEE-488 InterfaceInstallation Test for RS-232 Operations Getting Started With An Installation TestInstallation Test for IEEE-488 Operations Cabling the Meter to a HostIf Test Fails How the Meter Processes InputInput Strings Input TerminatorsSending Command Strings to the Meter Typical IEEE-488 Input StringsSending Numeric Values to the Meter Page Typical IEEE-488 Input Strings How the Meter Processes Output Triggering OutputExternal Triggering from the Front Panel External Triggering via the Computer Interface Setting the Trigger Type ConfigurationSettling Delay Service Requests IEEE-488 Only and Status RegistersTrigger Type Rear TriggerWrite Command Read CommandEnable Register Status Register SummaryESB MAV 3 2 1 Event Status and Event Status Enable Registers Event Status and Event Status Enable RegistersReading the Status Byte Register Status Byte RegisterDescription of Bits in ESR and ESE Bit No Name True Set to 1 ConditionsService Request Enable Register Description of Bits in the Status Byte Register Bit No NameTrue Set to 1 Condition IEEE-488 Capabilities and Common Commands Computer Interface Command SetIEEE-488 Interface Function Subsets IEEE-488 Common CommandsNumber State 10. IEEE-488 Common CommandsFunction Commands and Queries Function Modifier Commands and Queries11. Function Commands and Queries Primary Secondary Display 12. Function Modifier Commands and Queries Description Command12A. Reference Impedance Values Ref Impedance Value Ref ImpedanceMIN Ohms Range Range and Measurement Rate Commands and QueriesCurrent Range Frequency Range13. Range and Measurement Rate Commands and Queries Measurement Queries14. Measurement Queries Description Trigger Configuration Commands Compare Commands and Queries15. Compare Commands and Queries Description 16. Trigger Configuration Commands Description17. Miscellaneous Commands and Queries Description Miscellaneous Commands and Queries16A. Measurement Units Output with Format Measurement Function18. Remote/Local Configuration Commands Description RS-232 Remote/Local ConfigurationsSample Program for RS-232 Computer Interface Sample Program Using the RS-232 Computer InterfaceSample Programs for IEEE-488 Computer Interface Sample Programs Using the IEEE-488 Computer InterfaceAam25s.tif Aam26s.tif Aam27s.tif Operating the Meter Using the Computer Interface Line Fuse Introduction CleaningCurrent Input Fuses Testing Current Input FusesReplacing the 100 mA Input Fuse Replacing the 10 a Input FuseFront Panel Input Terminal Self-Test Diagnostics and Error Codes Error No Self-Test Error Codes MeaningPerformance Tests Input Level ServiceFrequency Min MaxUsing decades 300 Ω Short 30 kΩ Replacement Parts Replacement PartsPerformance Tests for mA Current Functions Min Max 29.982 30.018TM1 TM2 TM3 TM4 TM5 Appendices Page Display Counts and Reading Rates RS-232 and IEEE-488 Reading Transfer RatesResponse Times Common Mode Rejection Ratio Normal Mode Rejection RatioDC Voltage Input ImpedanceTrue RMS AC Voltage, AC-Coupled Decibel ResolutionMaximum Input AccuracyMaximum Crest Factor Common Mode Rejection Ratio Decibel Reference ResistanceAC + DC Voltage Accuracy AC Current DC CurrentRange Slow AccuracyRangeFrequency Slow Accuracy Medium Fast Maximum Crest Factor Maximum InputDiode Test/Continuity OhmsFrequency Sensitivity of AC VoltageSensitivity Level of AC Current Environmental Options GeneralASCII/IEEE-488 Bus Codes Page ASCII/IEEE-488 Bus Codes B Implementation of Ieee Standard IEEE-488.2 Device Documentation RequirementsNumeric Response Data Measurement *RDT and *RAT? commands are not implemented
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45 specifications

The Fluke 45 is a versatile and high-precision Digital Multimeter that is designed for a wide range of applications in electrical testing, troubleshooting, and maintenance. Known for its reliability and advanced features, the Fluke 45 is an essential tool for engineers, technicians, and professionals who require accurate measurement capabilities.

One of the standout features of the Fluke 45 is its ability to measure both AC and DC voltage and current. With a maximum input voltage of 1000 volts and current ranges up to 10 amps, users can conduct a variety of electrical tests with confidence. The device is equipped with an intuitive dual display, allowing for simultaneous viewing of multiple measurements. This feature enhances usability during complex diagnostics.

The Fluke 45 also boasts an impressive resolution of 0.1 mV and a basic accuracy of 0.25%, which translates to highly reliable readings. The auto-ranging capability simplifies the measurement process, automatically selecting the appropriate range based on the input signal, thus saving time and reducing user error.

In addition to voltage and current measurements, the Fluke 45 features resistance measurement capabilities, with a range of up to 40 MΩ. This makes it an effective tool for testing circuits, identifying faults, and ensuring the integrity of electrical systems. The continuity test function, complete with a built-in beeper, assists in quickly diagnosing wiring issues.

Another remarkable characteristic of the Fluke 45 is its frequency measurement capabilities, which can measure frequencies up to 1 MHz. This is particularly useful in applications involving signal analysis and troubleshooting oscillators.

Moreover, the Fluke 45 is designed with user convenience in mind. It is lightweight and portable, making it easy to carry around, whether on a job site or in a workshop. The rugged construction, reinforced with high-quality materials, ensures it can withstand harsh conditions often encountered in the field.

To enhance functionality, the Fluke 45 features a data hold function that freezes the displayed measurement for easier reporting. Additionally, it can store data for later retrieval, making it convenient for users who need to compile test results over time.

In summary, the Fluke 45 Digital Multimeter is an advanced instrument that combines precision, versatility, and user-friendly design. Its wide measurement capabilities, high accuracy, and durable build make it an invaluable tool for professionals in diverse electrical and electronic applications. Whether for routine maintenance or complex troubleshooting, the Fluke 45 stands out as a reliable partner in achieving accurate and efficient results.
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