Extech PCR70 Operating Manual

User Guide

Multifunction Process Calibrator

Model PRC70

1 Introduction

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

physical parameters. (See Table 1)

Table 1 - Source and Measurement Functions

DCV

Function Sourcing Function

DCV ● ● ● ● ● ● ● ● ●

RAMP ON × × × × × × × × × DCI

RAMP OFF ● ● ● ● ● ● ● ● ● OHM ● ● ● ● ● ● ● ● ● FREQ ● ● ● ● × ● ● ● ● PULSE ● ● ● ● × ● ● ● ● SWITCH ● ● ● ● × ● ● ● ● TC ● ● ● ● ● × × ● ● RTD ● ● ● ● ● × × ● ●

In addition to the functions listed in Table 1, the calibrator includes the following features:

z Measure and source simultaneously. The upper LCD area displays measurement information and the lower section

displays source information.

z Thermocouple measurement/source terminals and built-in lead connector (with RJ compensation)

z Manual step source, auto-step, and sweeping-step source

z Room temperature monitoring for all operations

z Measurement/source temperature monitoring function

z Measurement/source mA% display

z Measurement wave-filter function

z Measurement manual-hold function

DCI CONT. Measurement

LOOP OFF LOOP ON

OHM FREQ TC RTD SWITCH

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2 Warranty and Support Information

Warranty

EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY) warrants this instrument to be free of defects in parts and

workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become

necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781)

890-7440 ext. 210 for authorization or visit our website www.extech.com

must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and

proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as

misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech

specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct,

indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set

forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.

Calibration and Repair Services

Extech offers repar and calibration services for the products we sell. Extech also provides NIST certification for most

products. Call the Customer Care Department for information on calibration services available for this product. Extech

recommends that annual calibrations be performed.

for contact information. A Return Authorization (RA) number

Supportline(781)8907440

Technical Support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451

3 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.

z Two (2) sets of Industrial Test Leads

z One set of standard Test Leads

z One (1) set of Alligator clips

z User's Guide

z Two (2) Fuses 50mA/250V and 63mA/250V

Page 3 PRC70-EN-V2.1 12/11

4 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.

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

A may damage the meter or the equipment under test.

Refer to Table 2 for the international electric symbols adopted by the calibrator.

Table 2 - International Electrical Symbols

EARTH GROUND

Warning

To avoid possible electric shock or personal injury:

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

earth ground;

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

z Follow all equipment safety procedures;

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

jack;

z Do 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;

z Select the proper function and range for the measurement;

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

z Remove test leads from the meter before opening the battery door;

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

before using the meter;

z When using the probes, keep fingers behind the finger guards on the probes;

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

test lead first;

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

z Do 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;

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

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

z Disconnect the test leads before shifting to different source or measurement functions;

z When servicing the meter, use only specified replacement parts.

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

the low battery indicator (

) appears.

WARNING

INFORMATION

Caution

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

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

z Use the proper jacks, functions, and ranges for the measurement or source operation.

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5 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

5.1 Measurement/ Source Terminals

Figure 2 shows the calibrator’s measurement /source terminals. Table 3 explains their use.

Figure 2 - Measurement/ Source Terminals

Table 3 - Measurement/ Source Terminals

Terminal Function

Common (COM) return（-）terminal for all measurement functions Measurement Signals（+）：DCV, OHM, FREQ, TC, RTD, SWITCH, and CONT (continuity)

Measurement Signal（+）：mADC

3W Terminal：measurement terminal of the 3W OHM, RTD LOOP Terminal：+24VDC Loop Power Terminal

Source Signal:（+）DCmA

Source Signals：（-）OHM、RTD

Common (COM) return（-）terminal for source functions Source Signal（+）DCV, OHM, TC, RTD, XMT, FREQ, CYC, and SWITCH Source Signal:（-）mADC

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5.2 Keys

Figure 3 lists the calibrator’s function keys and Table 4 explains their use.

Figure 3 – Calibrator Function Keys

Table 4 – Function Key Descriptions

No. Name Function

1~5 Source value set key Increment source set point 6~10 Source value set key Decrement source set point 11 12 13 Power key Switch the power ON or OFF 14 Backlight Switch the backlight ON or OFF 15 16

18 19 20 21 22

23 24

Measurement ON key Source ON key

Measurement FUNC Key Source FUNC Key

TEMP Key

ZERO Key

Measurement RANGE Key Source RANGE Key

AVG Key 25/100% key

HOLD Key START Key

LOOP Key

Key

Switch measurement functions ON or OFF Switch source function ON or OFF

Select measurement function Select source function

Switch room temperature monitoring function ON or OFF In TC source or measurement mode, switch the RJ compensation ON/OFF

Set the source value to zero-point; In pulse source function, set the pulse number. Select measurement range; Measurement mA and percentage shifting. Select source range; Source mA and percentage shifting. Measuring average value

In mA source function, select 25% or 100% manual step output mode. In pulse number, frequency or switch source, set the frequency value.

Freeze measured value Source auto-pulse number, switch ON mA auto-stepping or sweeping function.

Convert sourced TC temperature and mV, and sourced RTD temperature and Ohms. 24v Loop circuit power: Convert the measured TC temperature and the mV, the

measured RTD temperature and the Ohms.

In DCmA source mode, select auto-wave; In frequency/pulse source mode, set amplitude

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5.3 Display Screen

a. Battery level indicator

b. Measure Mode icon

c. Measurement function ON

d. Measurement function OFF

e. Average value for measurement

f. Display HOLD for measured value

g. Switch measurement

h. Room temperature measurement

i. Beeper for measurement continuity

j. Measured value

k. Unit of measure

l. Dividing line between measurement and source mode displays

m. Type of RTD measurement / source

n. Dividing line between measurement and source mode displays

o. Type of Thermocouple (TC) measurement / source

p. Reference Junction Compensation ON

q. 24V Loop Power Supply ON

r. Source Mode icon

s. Source function ON

t. Source function OFF

u. Set -point for source

v. RUN icon for auto-step and auto-sweep

w. Unit of measure for setpoint of source

x. Not used

y. Not used

Figure 4 - LCD display

cd e

a b

I j

o q

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6 Source/Measurement Preparations

Precautions for Safe Use of the Instrument

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

Use of the Instrument.”

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

z In 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. If using an AC Charger, disconnect the plug from the wall outlet. Also switch OFF

power to the object under test that is connected to the input terminals. Contact the vendor.

z Charger: Use an AC Charger dedicated to the instrument. Avoid placing any load on the Charger; prevent any heat-

emitting object from coming into contact with the adapter.

General Handling Precautions

z Before transporting the instrument, switch OFF power to the object under test, and then power off the meter. When

using an AC Charger, disconnect the power cord from the wall outlet. Finally, detach all lead cables from the instrument.

Use a dedicated carry case when transporting the instrument.

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

z Do 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).

z Before cleaning the instrument’s case or operation panel, disconnect the power cord plug from the wall outlet if using an

AC Charger. Use a soft, damp cloth to gently wipe the outer surfaces of the instrument. Water that is allowed into the

instrument can result in malfunction.

z If using an AC Charger, disconnect the power cord plug from the wall outlet when the meter is not in use.

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

z Never use the instrument with the cover of the battery holder opened.

Environmental Requirements

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

z Ambient temperature and humidity:

Ambient temperature range: 32 to 122

F (0 to 50oC); ambient humidity range: 30 to 80% RH; non-condensing.

z Place the instrument on flat and level areas

Do not use the instrument in locations that are:

z Exposed to direct sunlight or close to any heat source.

z Exposed to frequent mechanical vibration.

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

z Close to any source of intensive electric or electromagnetic fields.

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

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

Notes:

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

Ambient temperature range: 74

z When using the instrument within a temperature range of 32 to 64

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

F (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.

z When using the instrument at an ambient humidity of 30% or lower, prevent electrostatic charges from being produced

by using an antistatic mat or other alternative means.

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z Condensation 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.

Indication of Battery Level

The battery replacement indicator shows the battery level in five steps according to the measured voltage of the batteries.

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).

Replace the batteries and fuses as described in the section “Replacing or installing batteries and fuses” toward the end of

this User Guide.

Connecting the Charger

Warning

z Make sure the voltage of the AC power source matches the rated supply voltage of the Charger before connecting the

Charger to the AC power source.

z Do not use a Charger other than the dedicated, supplied Charger.

z Do not charge non Ni-Cd, Ni-MH batteries.

Step 1: Ensure that the calibrator is OFF.

Step 2: Insert the plug of the optional Charger into the Charger connection jack.

Notes:

z Switch OFF the calibrator before connecting or disconnecting the Charger from AC power.

z Unplug the Charger from the Charger connection jack of the calibrator when discharging.

z Do not charge the calibrator without batteries installed.

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Switching Power ON

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

calibrator.

Switching MEASURE Mode ON and OFF

The measurement function defaults to the OFF state each time the calibrator is switched ON.

z Use the MEASURE (ON) key to switch the MEASURE mode ON/OFF.

z If the MEASURE function is not needed and therefore switched OFF, power to the measurement circuit is also switched

OFF within the calibrator. Thus, battery power is saved.

z Turning off the MEASURE function causes the on-screen measured value to switch off and the “OFF” indicator to

appear.

z To resume measurement when the MEASURE function is off, press the MEASURE (ON) key again.

Automatic Power OFF

When the calibrator is running on battery power, 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

“Programming 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 30 seconds. The time can be programmed or reset to the factory

default condition, see the “Programming the Global Settings” section.

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