Applications 4

External Trigger

Update Rate in the Dual Display Mode

The update rate is the time between successive measurements for a steady state signal.

In the dual display mode (when both the primary and secondary displays are on), if the measurement functions or the ranges selected for the primary and secondary displays are different, the update rate for each measurement function will vary from the update rate for that measurement function when only the primary display is on.

When the secondary display is on, the meter always waits for the measurement to be fully settled after changing the range or function before displaying a reading. The amount of delay depends on the functions and ranges selected for the primary and secondary displays as shown in Table 4-3.

AC and DC voltage measurements, however, are always optimized to be measured with a minimum of delay (including ac + dc volts). For these measurements, the update rate is the update rate for each single display measurement plus an additional 75 ms.

Table 4-4 lists the interval between measurements when the measurement function or range of the primary and secondary display differ. These intervals vary by measurement function, range, measurement rate (slow, medium, or fast), and measurement type (ac-and dc-type measurements mixed or not mixed).

External Trigger

The external trigger can be used with or without settling delays, as shown in Table 4-3. (Refer to Table 5-3 for trigger types.) The amount of trigger delay varies depending on differences between the primary and secondary displays, as described in the previous section.

When external trigger is enabled, the meter determines the ranges for the primary and secondary (if enabled) displays based on the input at that time. The meter is then ready to begin measuring the input on the optimum range as soon as the trigger is received. If the input changes so that either display autoranges after the trigger is received, the autorang- ing response times (as shown in Table 4-2) may be required before each measurement result is displayed.

The rear panel trigger input is level sensitive. A high level (above +3 V) will be recognized as a trigger within at most 3 ms (more than 3 ms if the computer interface or front panel is being used during the trigger time). If the trigger input line is still low when the previously triggered measurement is completed, another measurement will be triggered.

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Fluke 45 user manual External Trigger, Update Rate in the Dual Display Mode
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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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