Extech Instruments 380801 Manuale utente

User Manual

Power Analyzer Model 380801

Power Analyzer Datalogger Model 380803

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Introduction

This device offers the following features:

Convenient front panel plug-in and testing

Four displays for Watts, PF/VA, V/KHz, Amperes

True power, true RMS for AC Voltage (V) and Current (A)

Datalogger stores over 1000 readings (Model 380803)

Auto Range for Watts and Volts

RS-232 PC Interface (9-pin PC COM port)

Windows XP compatible Application Software

Careful use of this meter will provide years of reliable service.

Meter Description

1. Watts display

2. PF or VA display

3. V or KHz display

4. A display

5. 20A fuse

6. Input Receptacle

7. Input Terminal

8. Output Terminal

9. Output Receptacle

10. RS-232 Terminal

11. DC 12V Adaptor Input

12. Hold

13. MAX button

14. PF/VA Select Button

15. REC button (380803)

16. KHz (frequency)

17. On/Off Button

18. Battery Compartment Cover

19. Carrying Handle

20. Storage Space for Accessories

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Basic Operation

Warning: If a power source of 220V is connected to the input voltage

terminal/receptacle, do not connect a110V device to the output load

terminal/receptacle.

Using Receptacles

1. Plug one end of the power cord into the input receptacle and plug the other end into

the wall outlet.

2. Plug the device to be tested into the output load receptacle. The display will show the

W, PF, V, and A for the device under test.

Note 2: W= VA, 1KW = 1KVA = 1000W = 1000VA, when PF = 1.

Warning: The input receptacle and terminal are connected in parallel (as are the

outputs). To avoid electrical shock, do not touch any metal part of the receptacle

or terminal.

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Using Terminals

1.Plug one end of the power leads into the input voltage terminal (left) and connect the

other end of the test leads to the power source.

2.Plug the device power leads into the output load terminals. W, PF, V, and A will

display for the device under test.

Note 2: W=VA, 1KW = 1KVA = 1000W = 1000VA, when PF =1 at DC

Warning: The input and output receptacle and terminal are connected in

parallel, Do not touch any metal part of the receptacle or terminal to avoid

electrical shock.

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Using a Current Transformer

Warning: Only personnel well trained in the principles of Current Transformers

(CT) should attempt this test connection. When connecting a CT, follow the

wiring diagrams and instructions below.

1. Connect the CT’s kterminal (entering the CT) to the power line that passes through

the CT, and connect this kterminal to the input voltage black terminal (ground).

2. Connect the other power line to the input voltage red terminal.

3. Connect the CT’s lterminal (leaving the CT) to the output load black terminal

(ground).

4. The Watt reading and Amp reading should be multiplied by the CT ratio. The V and

PF readings do not need to be multiplied by the CT ratio.

Warning: The input receptacles and terminals are connected in parallel (as

are the outputs). Do not touch any metal part of the receptacle or terminal.

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PC Interface for Data Acquisition & Datalogging Features

Data Acquisition

Models 380801 and 380803 can be connected to a PC where readings can be logged in

real-time as they are taken. Transferred reading data can be viewed, plotted, statistically

analyzed, printed, saved, and imported in spreadsheet, database, word processing, and

other software programs. Instructions for Data Acquisition are included in the separate

Data Acquisition and Datalogging Manual on the software disc.

You can download a copy of the program from www.Extech.com.

Note: Due to the older version of software, this meter can only operate on Windows XP and

must use a 9-pin COM port on a Desk top PC as it requires the full +/- 10 volt RS232 signal

in order to operate. A USB adapter cannot be used with this meter.

Datalogging (Model 380803 only)

The Model 380803 has built-in memory where over one thousand readings can be stored

for later transfer to PC. Once transferred, data can be viewed, plotted, statistically

analyzed, printed, saved as a text file, and imported in spreadsheet, database, word

processing, and other software programs Instructions for Datalogging are included in the

separate Data Acquisition and Datalogging Manual.

Replacement of Batteries and 20A Fuse

Battery Replacement

When the low battery symbol is displayed on any of the

LCDs, replace the eight (8) 1.5V ‘AA’batteries.

1. Turn off the power analyzer.

2. Open the battery compartment by using a screw

driver (see diagram).

3. Replace the batteries.

4. Replace the battery compartment.

Never dispose of used batteries or rechargeable batteries in

household waste.

As consumers, users are legally required to take used

batteries to appropriate collection sites, the retail store

where the batteries were purchased, or wherever batteries

are sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end-

of-life devices to a designated collection point for the disposal of electrical and electronic

equipment

20A Fuse Replacement

To replace the 20A fuse, remove the fuse cover as indicated in item (5) in the Meter

Description section earlier in this manual and replace the fuse if necessary.

Warning: Do not replace the blown fuse with a fuse rating greater than 20A.

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Glossary of Terms

W True Watt

PF Power Factor

V True RMS Voltage

A True RMS Ampere

Phase Angle: Phase angle Time difference between V and A calculated by

cos-1 (Power Factor)

VA Apparent Power (V * A)

VAR Reactive Power (SQRT [VA2–W2])

IR Equivalent current (through equivalent resistance)

Req Equivalent resistance

IL Equivalent current (through equivalent inductance)

XL Equivalent impedance of equivalent inductance

Leq Equivalent inductance

CAP Required capacitance

CR Carriage Return

LF Line Feed

EPS Datalogger Memory Self-test

EPE Erasing Datalogger Memory



True Power (3



3W)

WRS Power of R phase with respect to S phase

WTS Power of T phase with respect to S phase

VA3



Apparent Power (3



3W and Balanced Load)

VAR3



Reactive Power (3



3W and Balanced Load)

PF3



Power Factor (3



3W and Balanced Load)

Mean Mean Value

Std Dev Standard Deviation

Best Fit A line drawn to fit a curve with minimum error

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Measurement of 3-Phase 3-Wire Power

Using One Power Analyzer

Measure WRS first (RST phases must

be correctly identified)

1. Connect the R-phase of the

power source to the black

terminal of the input voltage

2. Connect the S-phase of the

power source to the red terminal

of the input voltage

3. Plug the R-phase of the device

to be tested to the black terminal

of the output load. Do not short

the R-phase of the device to be

tested to the R-phase of the

input power source.

4. Record the reading of WRS

displayed on the ‘W’LCD.

Measure WTS secondly (RST phases

must be correctly identified)

1. Connect the T-phase of the

power source to the black

terminal of the input voltage

2. Connect S-phase of the power

source to the red terminal of the input voltage

3. Plug the T-phase of the device to be tested to the black terminal of the output

load. Do not short the T-phase of the device to be tested to the T-phase of

the input power source.

4. Record the reading of WTS displayed on the ‘W’ LCD.

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Using Two Power Analyzers

Measure WRS and WTS (RST phases must be correctly identified)

1. Connect the R-phase of the power source to the black terminal of the input

voltage of power analyzer 1.

2. Connect the S-phase of the power source to the red terminal of the input

voltage of power analyzer 1.

3. Plug the R-phase of the device to be tested to the black terminal of the output

load of power analyzer 1. Do not short the R-phase of the load to the R-phase

of the input power source.

4. Record the reading of WRS displayed on the ‘W’LCD of power analyzer 1.

5. Connect the T-phase of the power source to the black terminal of the input

voltage of power analyzer 2.

6. Connect the S-phase of the power source to the red terminal of the input

voltage of power analyzer 2.

7. Plug the T-phase of the device to be tested to the black terminal of the output

load. Do not short the T-phase of the device to be tested to the T-phase of the

input power source.

8. Record the reading of WTS displayed on the Watt LCD of power analyzer 2.

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Using Current Transformers (CT) with 2 Power Analyzers

Measure WRS and WTS (RST phases must be correctly identified)

1. Connect the R-Phase to the black terminal of the input voltage of power

analyzer 1.

2. Connect the S-phase to the red terminal of the input voltage of power

analyzer 1.

3. Connect the kterminal of CT1 to the R-phase.

4. Connect the lterminal of CT1 to the black terminal of the output load of power

analyzer 1.

5. The Watt reading of the power analyzer 1 is WRS

6. Connect the T-phase to the black terminal of the input voltage of power

analyzer 2.

7. Connect the S-phase to the red terminal of the input voltage of power analyzer 2.

8. Connect the kterminal of CT2 to the R-phase.

9. Connect the lterminal of CT2 with the black terminal of the output load of power

analyzer 1.

10.The Watt reading of the power analyzer 2 is WTS

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