Extech Instruments PRC50 Manuale utente

Page 1 PRC50-EN-V2.1 11/11

User Guide

Multifunction Process Calibrator

Model PRC50



Page 2 PRC50-EN-V2.1 11/11

1 Introduction

This multifunction process calibrator is a handheld, battery-operated instrument that measures and sources electrical and

physical parameters.

Main Features:

zMeasure: DC-voltage, DC-current, frequency and continuity

zSource: DC-voltage, DC-current, simulation transmitter, frequency and pulse

Additional features:

zManual step source, auto-step and sweeping–step source

zMeasure/source mA% display

zWave-filter function

zManual-hold function

2 Standard Accessories

Ensure that the package contains all of the accessories listed below. If items are damaged, please contact the vendor from

which the product was purchased.

zOne (1) set of Industrial Test Leads

zOne (1) set of Standard Test Leads

zOne (1) set of Alligator clips

zUser's Guide

zTwo (2) Fuses 50mA/250V and 63mA/250V

Page 3 PRC50-EN-V2.1 11/11

3 Safety Information

For the correct and safe use of the instrument, be sure to follow the cautionary notes stated in this manual whenever

handling the instrument. Extech Instruments shall not be held liable for any damage resulting from use of the instrument in a

manner other than prescribed in the cautionary notes.

A Warning identifies conditions and actions that pose hazards to the user; a Caution identifies conditions and actions that

may damage the meter or the equipment under test.

Refer to Table 1 for the international electric symbols adopted by the calibrator.

Table 1 - International Electrical Symbols

EARTH GROUND

WARNING

INFORMATION



Warning

To avoid possible electric shock or personal injury:

zDo not apply more than the rated voltage, as marked on the calibrator, between terminals or between any terminal and

earth ground;

zBefore use, verify the meter’s operation by measuring a known voltage;

zFollow all equipment safety procedures;

zDo not connect the probe of the test leads with any live power when the other end has been inserted into the current

jack;

zDo not use the meter if it is damaged. Before using the meter, inspect the case. Look for cracks or missing plastic. Pay

particular attention to the insulation surrounding the connectors;

zSelect the proper function and range for the measurement;

zMake sure the battery door is closed and latched before operating the meter;

zRemove test leads from the meter before opening the battery door;

zInspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Replace damaged test leads

before using the meter;

zWhen using the probes, keep fingers behind the finger guards on the probes;

zConnect the common test lead before connecting the live test lead. When disconnecting test leads, disconnect the live

test lead first;

zDo not use the meter if it operates abnormally. Protection may be impaired. When in doubt, have the meter inspected;

zDo not operate this instrument in areas where inflammable or explosive gases or vapor exists. It is extremely hazardous

to use the instrument under such environments;

zDo not operate the meter near explosive gas, vapor, or dust;

zUse only four (4) AAA 1.5V batteries, properly installed in the meter case, to power the meter;

zDisconnect the test leads before changing source or measurement functions;

zWhen servicing the meter, use only specified replacement parts.

zTo avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as

the low battery indicator ( ) appears.

Page 4 PRC50-EN-V2.1 11/11

Caution

To avoid possible damage to meter or to equipment under test:

zDisconnect the power and discharge all high-voltage capacitors before testing resistance or continuity.

zUse the proper jacks, functions, and ranges for the measurement or source operation in question.

4 Calibrator Description

Refer to Figure 1

1. LCD display

2. Digit up/down adjust buttons

3. Control keypad

4. Measurement terminals

5. Source terminals

Figure 1 – Meter Description

4.1 Measurement/ Source Terminals

Figure 2 shows the calibrator’s measurement /source terminals. Table 2 explains their use.

Figure 2 - Measurement/ Source Terminals

Table 2 - Measurement/ Source Terminals

Terminal Function

1 Measurement Signals（+）：DCmV、

2 Measurement Signals（+）：DCV、FREQ

3 Measurement Signals（+）：DCmA

4 Common (return ) （-）terminal for all

measurement functions

5 Source Signals：（-）DCmA

Source Signals：(+) Simulate mA

6 Source Signals：（+）DCmA

LOOP Terminal：+24VDC Loop Power Terminal

7 Common (return ) （-）terminal for source

functions

8 Source Signals：（+）DCV、FREQ、PULSE

Page 5 PRC50-EN-V2.1 11/11

4.2 Keys

Figure 3 lists the calibrator’s function keys and Table 3 explains their use.

12345

678910

23 2425 26

Figure 3 – Calibrator Function Keys

Table 3 – Function Key Descriptions

No. Name Function

1~5 Source value set keys Increment source set point

6~10 Source value set keys Decrement source set point

11 MODE key Mode key (press to change the function mode)

12 ON key Switch ON/OFF measurement/ source function

13 Power key Switch ON/OFF power

14 Backlight Switch ON/OFF backlight

15 V Key Select measurement/source DCV function

16 PULSE Key Select source pulse function

17 mA Key Select measurement/source mA function

18 FREQ Key Select measurement/source FREQ function

19 Key Select measurement continuity function

20 RANGE Key Select measurement/source range; mA /percentage toggle key

21 UNIT Key not used

22 LOOP key Switch ON/OFF 24V Loop power

23 ZERO Key Set the source value to its default value;

In pulse source function, set the pulse value

24 START Key Source auto-pulse value;

Switch ON the mA auto-stepping or sweeping function;

HOLD (freeze) the measured value;

25 Key In DCmA source function ,select the auto-wave type;

In frequency or pulse source, set the frequency value.

25/100% Key

In mA source function, select 25% or 100% manual step output type;

In pulse number mode, frequency source, set the amplitude value;

Measure the average value.

Page 6 PRC50-EN-V2.1 11/11

4.3 Display Screen

Figure 4 shows a typical display screen.

Figure 4 - LCD display

a. Measurement

b. Source

c. Measurement/Source frequency

d. Not used

e. Battery level indicator

f. Measurement/Source function ON

g. Source function OFF

h. Measurement/Source voltage

i. Measurement/Source current

j. Source pulse

k. 24V Loop Power Supply ON

l. Not used

m. Beeper for measurement continuity

n. Not used

o. Measured value HOLD

p. Measurement average value

q. Not used

r. Main numerical display

s. Unit of measure for main display

t. DCmA 25% or 100% manual step source

u. Start source number of pulses / DCmA auto-stepping or sweeping source function

v. 24V Loop Power Supply ON

w. DCmA auto-stepping or sweeping source

x. Unit of measure for secondary display

y. Secondary numerical display

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no p

wv y

Page 7 PRC50-EN-V2.1 11/11

Source/Measurement Preparations

Precautions for Safe Use of the Instrument

zWhen using the instrument for the first time, be sure to read the instructions given in Section 4 “Precautions for Safe

Use of the Instrument.”

zDo not open the instrument’s case. Contact the vendor for service.

zIn case of failure: Should the instrument begin to emit smoke, give off an unusual odor, or show any other anomaly,

immediately switch OFF the POWER. Also switch OFF power to the object under test that is connected to the input

terminals. Contact the vendor.

General Handling Precautions

zBefore transporting the instrument, switch OFF power to the object under test, and then power off the meter. Finally,

detach all lead cables from the instrument. Use a dedicated carry case when transporting the instrument.

zDo not bring any electrified object close to the input terminals, since this may damage the internal circuitry.

zDo not apply any volatile chemical to the instrument’s case or operation panel. Do not leave the instrument in contact

with any product made of rubber or vinyl for a prolonged period. Be careful not to let a soldering iron or any other heat-

emitting object come into contact with the operation panel (panel is made of thermoplastic resin).

zUse a soft, damp cloth to gently wipe the outer surfaces of the instrument. Water that is allowed into the instrument can

result in malfunction.

zFor handling precautions regarding the batteries, see “Installing or Replacing the Batteries”.

zNever use the instrument with the cover of the battery holder opened.

Environmental Requirements

Use the instrument in locations that meet the following environmental requirements:

zAmbient temperature range: 32 to 122oF (0 to 50oC); ambient humidity range: 20 to 80% RH; non-condensing.

zPlace the instrument on flat and level areas

Do not use the instrument in locations that are:

zExposed to direct sunlight or close to any heat source.

zExposed to frequent mechanical vibration.

zClose to an electrical noise source, such as high-voltage equipment or motive power sources.

zClose to any source of intensive electric or electromagnetic fields.

zExposed to large amounts of grease fumes, hot steam, dust or corrosive gases.

zExposed to unstable areas such as where a risk of explosion due to the presence of flammable gases exists.

Notes:

zUse the instrument under the following environmental conditions when precise measurements are required:

Ambient temperature range: 74oF (23oC) ±5o; ambient humidity range: 20 to 80% RH (non-condensing)

zWhen using the instrument within a temperature range of 32 to 64oF (0 to 18oC) or 82 to 122oF (28 to 50oC), add a value

based on the temperature coefficient shown in the “Specifications” section to the given accuracy rating.

zWhen using the instrument at an ambient humidity of 30% or lower, prevent electrostatic charges by using an anti-static

mat or other alternative means.

zCondensation may occur if the instrument is relocated from places with low temperature and humidity to places with

high temperature and humidity, or if the instrument experiences a sudden temperature change. In these cases, leave

the instrument under the given ambient temperature for at least one hour to ensure that the instrument is free from

condensation before using the instrument.

Page 8 PRC50-EN-V2.1 11/11

Indication of Battery Level

The battery replacement indicator shows the battery level in five stages.

Full battery:

The battery level is below 50% full:

The battery level is below 25% full:

Low battery:

The battery icon flashes in sequence when charging.

Note that the battery replacement indicator is driven by directly measuring the battery voltage when the calibrator is in actual

operation. Consequently, the indicator may read differently depending on the battery load condition (e.g., the load condition

of the source output or on/off state of the measurement function).

To replace batteries and/or fuses refer to Section 12 of this User Guide.

Switching Power ON

Press the Power key once to switch ON the calibrator. Press and hold the Power key for 2 seconds to switch it OFF.

Automatic Power OFF

When the calibrator is running on batteries and no key is pressed for approximately ten minutes, the calibrator switches OFF

automatically. The automatic power-off time can be programmed or set to the factory default state, see the “Global Settings”

section.

Switching the LCD Backlight ON and OFF

Press the backlight key to switch ON the backlight; press again to switch it OFF. Battery life is shortened by backlight

overuse.

Notes: The backlight automatically switches OFF after 10 seconds. The time can be programmed or reset to the factory

default condition, see the “Global Settings” section.

Page 9 PRC50-EN-V2.1 11/11

5 Source

The calibrator can source a DC voltage, DC current, resistance, frequency, and pulse signal.

Warning

To avoid electrical shock, do not apply more than the rated voltage, as marked on the calibrator, between terminals or

between any terminal and earth ground. Always use the calibrator in locations with a voltage to ground value below

30Vpeak.

Caution

zDo not apply any voltage to the output terminals for ranges other than 4-20mA simulating transmitter outputs.

Otherwise, the internal circuitry may be damaged.

5.1 Connecting Cables to Terminals

For DC voltage, frequency, or pulse (see Figure 5)

Step 1: Connect the black lead cable for source to the COM output terminal and the red lead cable to the “Vhz” output

terminal.

Step 2: Connect the other ends of the cables to the input of equipment under test while making sure the polarities are

correct.

Figure 5 - Sourcing DC voltage, frequency, and pulse

For DC current (see Figure 6)

Step 1: Connect the black lead cable for source to the “mA-” output terminal and the red lead cable to the ‘’mA+/LOOP’’

output terminal.

Step 2: Connect the other ends of the cables to the input of equipment under test while making sure the polarities are

correct.

Figure 6 - Sourcing DC Current

Page 10 PRC50-EN-V2.1 11/11

5.2 Sourcing DC Voltage

Step 1: Use the〔V〕key to select the DC voltage source function and then select the desired range from 1000mV, 10V by

pressing the〔RANGE〕key. The default value, the unit of the selected source function, and the source DC Current range

will be displayed on the LCD.

Step 2: Set the output value, digit by digit, using〔S〕/〔T〕keys.

Each pair of〔S〕/〔T〕keys corresponds to each digit of the LCD reading. Each press of the〔S〕/〔T〕key increases

or decreases the digit. Increasing the digit from 9 or decreasing it from 0 causes the digit to overflow or underflow, allowing

the output value to be set without interruption. Holding down the〔S〕/〔T〕key continuously changes the digit in question

quickly. The value won’t change if it is increased or decreased to the Maximum or Minimum value. Pressing the (ZERO) key

initializes the output set point to the default value (0).

Step 3: Pressing the〔ON〕key causes the indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator sources the

present DC voltage between the output terminals.

Step 4: To turn off the output, press the〔ON〕key again. The’’ OFF ‘’ icon appears on the LCD and no signals are sourced

between the terminals.

5.3 Sourcing DC Current

Step 1: Use the〔mA〕key to select the desired source function 20mA. The default value and unit of the selected source

function will be displayed on the LCD.

Step 2: Set the output value digit by digit using〔S〕/〔T〕keys.

Each pair of〔S〕/〔T〕keys corresponds to each digit of the LCD reading. Each press of the〔S〕/〔T〕key increases

or decreases the digit. Increasing the digit from 9 or decreasing it from 0 causes the digit to overflow or underflow, allowing

the output value to be set without interruption. Holding down the〔S〕/〔T〕key continuously changes the digit in question

quickly. The value won’t change if it is increased or decreased to the Maximum or Minimum value. Pressing the (ZERO) key

initializes the output set point to the default value (0).

Step 3: Pressing the〔ON〕key causes the indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator sources the

preset DC current between the output terminals.

Step 4: To turn off the output, press the〔ON〕key again. The’’ OFF ‘’icon appears on the LCD and no signals are sourced

between the terminals.

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