45

Users Manual

Table 5-7. Description of Bits in the Status Byte Register*

Bit No.

0

1

2

3

4

5

6

7

Name

Not used.

Not used.

Not used.

Not used.

Message Available (MAV)

Event Status (ESB)

Master Summary Status† (MSS)

Not used.

True (Set to 1) Condition

Always set to 0.

Always set to 0.

Always set to 0.

Always set to 0.

Data is available in the output buffer. Bit set to 1 when response to query placed in output buffer. Bit cleared (set to 0) when output terminator sent to host.

One or more of enabled events in the Event Status Register have occurred. To determine which events have occurred, send the meter "*ERR?" to read the Event Status Register.

Set to 1 if any enabled bit in the STB (MSS) register is set to 1, otherwise set to 0. Status of MSS bit returned by STB? query command.

Request Service (RQS) Set to 1 if service requested from front panel or MSS set to 1. Status of bit returned by serial poll, which clears RQS.

Always set to 0.

† As read by *STB? command. If the Status Byte Register is read by a serial poll, bit 6 is returned as RQS.

Service Request Enable Register

The SRE Register is an 8-bit register that enables or disables (i.e., masks) corresponding summary messages in the Status Byte Register.

The meter may be programmed to make a service request on errors or when output is available. Conditions that trigger a service request are specified by writing a binary- weighted value to the SRE Register, using the "*SRE" command.

EXAMPLE

EXPLANATION

*SRE 16

Enables the generation of an SRQ when bit 4 (MAY) in the Status

 

Byte Register is set to 1. 16 is the decimal equivalent of 00010000

 

binary. This means that bit 4 in SRE Register (that corresponds to the

 

MAV bit in the Status Byte Register) is I and all other bits are 0.

EXAMPLE

EXPLANATION

*SRE 48

Enables the generation of an SRQ when bits 4 and 5 (MAV and

 

ESB) in the Status Byte Register are set to 1. The binary equivalent

 

of 48 is 00110000, indicating that bits 4 and 5 are set to 1.

If any bit in the SRE is set to 1, the RQS bit (bit 6) in the Status Byte Register is enabled, meaning a service request can be generated when the appropriate bits in STB become 1. At power-up or on any device-clear command, the SRE Register is set to 00 (decimal).

Use the "*SRE?" query (see Table 5-8) to read the SRE Register. The meter returns a binary-weighted integer that represents the enabled bits in the register. (The value of bit

5-18

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Fluke 45 user manual Service Request Enable Register, Description of Bits in the Status Byte Register Bit No Name
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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.

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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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