45

Users Manual

CIRCUIT

LOAD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45 DUAL DISPLAY MULTIMETER

 

 

 

 

 

V

 

10A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

600V CAT I

!

 

 

 

 

 

 

 

 

CAL

 

1000V CAT I

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ENABLE

 

COM

 

100

 

 

 

 

 

 

 

 

 

 

mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FUSE F1

V

A

 

 

 

 

REL

dB

2ND

 

 

500 mA

 

 

 

 

 

 

F 250V

 

 

 

 

 

 

REF#

REF

LOCAL

 

FUSED

V

A

FREQ

AUTO

 

 

 

 

 

 

 

 

 

 

HOLD

MN MX

RATE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COMP

HI

LO

THRESH

ADDR

BAUD

 

 

 

 

 

 

 

 

 

POWER

 

 

 

 

 

 

 

 

 

 

 

2ND

 

 

 

V

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

aam17f.eps

Figure 4-2 DC Voltage and DC Current Measurement on Input Signal

The lead from the internal measuring circuitry of the meter to the COM binding post (on the front panel) is the same for both voltage and current measurements. The resistance of this lead is approximately .003 . If current is being measured, therefore, a voltage drop will occur in the resistance that is common to both circuits. This internal resistance, when added to the external resistance of the lead from the COM input terminal will affect the accuracy of the voltage reading. For instance, if the external lead resistance is .007 , the "total" common resistance is .010 . If there is 1 A of current, the voltage reading would be affected by

(1 A x.01 ) = .01 V or 10 m V.

Depending on the circumstances, this may be significant.

If you want to measure dc voltage on an input signal in the primary display and dc current in the secondary display, proceed as follows:

1.Turn the meter on.

2.Press Yto select the dc voltage function for the primary display.

3.Press S, then press Cto select the dc current function for the secondary display.

4.Connect the leads to the test circuit as shown in Figure 4-2 and read the measurements on the displays. Although current will be displayed as negative, it is in fact positive when interpreted according current flow convention.

Response Times

Response time is the time between a change in an input and when that change is displayed. The meter’s response time depends on many factors: the measurement function selected, number of measurements being made (single measurement when only the primary display is used, or two measurements when both the primary and secondary display are used), the input

4-4

Page 48
Image 48
Fluke 45 user manual Response Times, DC Voltage and DC Current Measurement on Input Signal

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.