45

Users Manual

The meter exits the list editor, returns to normal operation, and is configured for

RS-232 print-only operations.

Cabling the Meter to a Host or Printer (RS-232)

The meter communicates with a host through a DB-9 interface connector on the rear panel of the meter. A connector pinout for the RS-232 interface is on the rear of the instrument.

Cable the meter to the host or terminal using a cable appropriate to your application (see Table 1-1) that is less than 50 feet (15 meters) long. Longer cables are permitted, providing that the load capacitance measured at the interface point (including the signal terminator) does not exceed 2500 picofarads.

To connect the meter with an IBM PC/ AT (DB-9 connector), use both an RS40 and RS41 cable connected end-to-end. Alternatively, a cable intended for interconnecting two IBM PC/ATs can be used.

To connect the meter to a specific brand of RS-232 printer, use the cable that would be used to connect that printer to an RS-232 port on an IBM PC/AT (DB-9 connector).

After cabling is complete, turn the meter back on, and you are now ready to operate the meter over the RS-232 interface.

Character Echoing and Deletion

When the meter is operated via the RS-232 interface, you can control whether characters are echoed to the host’s display screen.

When Echo is set "On", characters sent to the meter are echoed on the host’s display screen. With Echo "OFF", characters are not echoed. To set the Echo parameter, refer to the procedure under "Setting Communication Parameters (RS-232)", above.

If you send a character to the meter over the RS-232 interface directly from a keyboard, pressing the <DELETE> or <BACKSPACE> key deletes the previous character. A backspace is echoed to the display screen if Echo is "ON".

Device Clear Using ^C (CNTRL C)

^C (CNTRL C) is the RS-232 equivalent of IEEE-488 DCI (device clear), causing "=>" followed by a carriage return and line feed to be output.

RS-232 Prompts

When the host sends a command to the meter over the RS-232 interface, the meter parses it, executes it and returns a response (if appropriate), and sends you one of three prompts:

=> No errors were detected and the command was successfully parsed and executed.

?> A Command Error was detected. The command was not executed because it was not understood.

For instance, this prompt would be returned if the meter was sent an input string that contained a syntax error.

!> An Execution Error was detected. The command was understood but not executed (i.e., a device-dependent error).

For instance, this prompt would be returned if you attempted to use the decibels modifier (dB) on a frequency measurement (FREQ); or if you sent the meter calibration commands when it was not in calibration mode.

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Fluke 45 Cabling the Meter to a Host or Printer RS-232, Character Echoing and Deletion, Device Clear Using C Cntrl C
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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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