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

Page 2 PRC70-EN-V2.1 12/11

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: [e-mail]

Repair & Returns: Extension 210; E-mail: [e-mail]

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.

Page 4 PRC70-EN-V2.1 12/11

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

2

4

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

1

3

5

Terminal Function

1

2

3

4

5

6

7

8

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

Page 5 PRC70-EN-V2.1 12/11

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

17

18
19
20
21
22

23
24

25

26

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

Page 6 PRC70-EN-V2.1 12/11

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

m

Figure 4 - LCD display

cd e

a
b

I
j

x

l

n

r

s

t

u

y

g

f

v

h

k

o
q

p

w

Page 7 PRC70-EN-V2.1 12/11

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:

o

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:

o

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)

o

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.

Page 8 PRC70-EN-V2.1 12/11

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.

Page 9 PRC70-EN-V2.1 12/11

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.

Page 10 PRC70-EN-V2.1 12/11

7 Source

The calibrator can source a DC voltage, DC current, resistance, thermocouple, RTD, frequency, pulse signal or contact

output.

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 30V.

Caution

z Do not apply voltage to the output terminals for ranges other than 4-20mA simulating transmitter outputs. Otherwise, the

internal circuitry may be damaged.

z The instrument has been calibrated without taking into account the voltage drop due to the resistance component of the

lead cables. Care must be taken therefore when drawing a load current since the voltage drop due to the resistance

component (approximately 0.1 Ω) of the lead cables induces a slight error.

7.1 Connecting Cables to Terminals

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

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

terminal.

Step 2: Connect the other ends of the cables to the input of equipment under test ensuring the polarities are correct.

Figure 5 - Sourcing DC voltage, TC, frequency, pulse and contact output

For DC current (see Figure 6)

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

output terminal.

Step 2: Connect the other ends of the cables to the input of equipment under test ensuring correct polarity.

Figure 6 - Sourcing DC Current

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

For resistance and RTD signal (see Figure 7)

Step 1: Connect the two black lead cables for source to the ‘’ΩRTD’’ terminal and the red lead cable to the “VhzTcmA-”

terminal.

Step 2: Connect the other ends of the cables to the input of equipment under test ensuring correct polarity.

Figure 7 - Sourcing Resistances and RTD

7.2 Sourcing DC Voltage

Step 1: Using the Function selector switch (FUNC) select the DC voltage source function, select the desired range from

100mV, 1V, and 10V by pressing the〔RANGE〕key. The default value, the unit of the selected source function, and the

range is displayed in the lower area of the LCD.

Step 2: Set the output value digit by digit using the 〔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 changes the digit in question quickly. The

value will not 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 voltage between the output terminals.

Step 4: To switch OFF the output, press the (ON) key again. The’’ OFF ‘’ icon appears on the LCD and no signals are

sourced between the terminals.

7.3 Sourcing DC Current

Step 1: Using the Function selector switch (FUNC) select the desired source function 20mA. The default value and unit of

the selected source function is displayed in the lower area of 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 voltage between the output terminals.

Step 4: To switch OFF the output, press the (ON) key again. The OFF icon appears on the LCD.

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

7.3.1 Manually Set 25%, 100% 4–20 mA Function

The source can be set within the 4–20 mA current range.

Step 1: In DC current mode, press the〔25%100%〕key to display “25%SET” on the lower part of the screen, and press

again to display “100%SET”. The default source values will be shown.

Step 2: Using each pair of 〔S〕/〔T〕output setting keys, set the signal in a step-by-step manner. In the 25% set point

condition, the signal can be set in 4 mA increments or decrements in the sequential order 4-8-12-16-20 by each press of the

key. In the 100% set point condition, the signal can set in 16 mA increments or decrements by each press of the key.

Pressing the (ZERO) key initializes the signal set point to the default value (4.00).

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

preset 4–20 mA current signal between the output terminals.

Step 4: To switch OFF the output, press the (ON) key again. The’’ OFF ‘’appears on the LCD and no signals are sourced

between the terminals.

6.3.2 Auto-stepping and auto-sweeping 4-20mA function

The user can set a 4–20 mA range in which to auto-step or auto-sweep. 80 seconds are required to finish a 4-20mA cycle in

auto-sweeping mode and 20 seconds are required for auto-stepping mode.

Step 1: In the DC current mode, press the 〔

the screen; press again to display the auto-sweeping mode icon “

〕key to display the auto-stepping mode icon “ ” on the lower part of

”. The default source value will display.

Step 2: Pressing the (ON) key causes the indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator sources the

default 4–20 mA current signal between the output terminals.

Step 3: Pressing the (START) key starts the auto-stepping or the auto-sweeping mode. The “RUN” icon is displayed in the

lower part of the LCD.

Step 4: Pressing the (START) key again stops the auto-stepping or the auto-sweeping mode. The “RUN” icon switches

OFF.

Step 5: Pressing the (ON) key cancels the sourcing and the ‘’OFF’’ icon is displayed on the screen. No signals are sourced

between the terminals.

Notes:

z Press the (START) key again to continue the auto-stepping or the auto-sweeping mode after stopping them; The “RUN”

icon is displayed on the lower part of the screen.

z The ability to use the (START) key to start mA auto-stepping and auto-sweeping mode is only available when the

source function is in the ON state.

z Starting the mA auto-sweeping mode switches OFF the measurement mode. The mA auto-stepping mode and the

measurement function cannot run simultaneously.

Page 13 PRC70-EN-V2.1 12/11

7.3.3 mA% display

In the mA source mode, press the (RANGE) key to convert the preset source value to mA% mode (shown on the lower

part of the LCD) as described in the following equation.

100 (current measured value mA-4mA)

mA % = %

16 mA

Press the (RANGE) key to return to the current preset value (shown on the lower part of the LCD).

Notes:

Increment/decrement setting functionality is not available in mA% mode. Press the (RANGE) key again to return to the

source set mode.

7.3.4 4-20 mA simulate transmitter source

Connect the calibrator and loop power as shown in Figure 8. Operate as described in the DC current Source section.

Figure 8 - 4-20 mA simulation transmitter source

7.4 Sourcing Resistance

z The calibrator sources a resistance signal by receiving the resistance-measuring current (I) supplied from the device

being calibrated (such as a resistance meter) and then delivering the voltage (V) proportional to the preset resistance

(R) between the output terminals, and thus producing the equivalent resistance R =V/I. Consequently, the calibrator

sources the signal correctly only for devices that use this method of measurement.

z The allowable range of the resistance measuring current that the calibrator receives from a resistance measuring device

under calibration is rated as 0.1 to 3 mA. To ensure accuracy, the resistance measuring current from the device under

calibration is strictly confined within the range. See the “Specifications” section.

z Any resistance signal being sourced does not include the resistance component of the lead cables. The whole

resistance, when measured at the ends of the lead cables for sourcing, is found by adding the resistance of the lead

cables (approximately 0.1 ohm) to the sourced resistance signal. For the sourcing of precise resistance signals, use a

three-wire or a four-wire connection.

z If capacitance between the terminals of a device under calibration is greater than 0.1µF, the calibrator may fail to source

correct resistance signals.

Step 1: Using the function selector switch (FUNC), select the Ohm mode. Using the (RANGE) key, select the range. The

selected function, the default range source value, and the unit are shown in the lower part of the LCD.

Step 2: Set the output value, digit by digit, using each pair of〔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 changes the digit in question quickly. The

Page 14 PRC70-EN-V2.1 12/11

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).

Figure 9 - Connection method based on three-wire and four-wire

Step 3: Pressing the (ON) key causes the SOURCE indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator

sources the preset resistance value between the output terminals.

Step 4: To switch OFF the output, press the (ON) key again. The ‘’OFF‘’ icon appears on the LCD and no signals are

sourced between the terminals. The connection method based on three-wire and four-wire is shown in Figure 9:

7.5 Simulate Sourcing TC (Thermocouple Temperature)

Note that the calibrator is designed to include an internal temperature sensor. To calibrate a device without using external

o

C reference junction temperature compensation, use the RJ sensor function. The “RJ-ON” icon appears on the middle part

0

o

of the screen when activated. If the RJ function is not used, an external 0

Step 1: Using the function selector key (FUNC), select the TC source function. Using the (RANGE) key select the desired

thermocouple type (K, E, J, T, B, N, R, S). The selected function, the default range source value, and the unit of measure are

shown in the lower part of the LCD.

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

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 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.

Step 3: Pressing the (ON) key causes the SOURCE indicator on the LCD to change from OFF to ON. A thermo-

electromotive force based on the temperature detected by the RJ sensor develops between the output terminals.

Step 4: To switch OFF the output, press the (ON) key again. The ‘’OFF‘’ icon appears on the LCD and no signals sourced

between the terminals.

Note: If the reference junction compensation is not needed, press the〔RJ-ON〕key to switch it OFF. With the RJ

compensation switched OFF, the calibrator will only source an accurate value when external 0

compensation is used.

C reference will be required.

o

C reference junction

Page 15 PRC70-EN-V2.1 12/11

7.5.1 Temperature (TC) Monitor Function

The calibrator offers a temperature monitor function convenient for observing the voltage value sourced between the output

terminals in TC source mode. In the TC source mode, press the (START) key and the LCD will show the voltage value

sourced between the output terminals (this value varies in response to the changes of the reference junction compensation).

Press the (START) key again and the LCD will show the preset temperature value.

7.6 Sourcing RTD Temperature

z First, the calibrator sources a resistance signal by receiving the resistance-measuring current (I) supplied from the

device being calibrated (such as a resistance meter) and then delivering the voltage (V) proportional to the preset

resistance (R) between the output terminals, and thus producing the equivalent resistance R =V/I. Consequently, the

calibrator sources the signal correctly only for such devices that employ this method of measurement.

z The allowable range of the resistance measuring current that the calibrator receives from a resistance measuring device

under calibration is rated as 0.1 to 3 mA. To ensure accuracy, the resistance measuring current from the device under

calibration is strictly confined within this range. For further details, see the “Specifications” section.

z Sourced resistance signals do not include the resistance component of the lead cables. The entire resistance, when

measured at the ends of the lead cables for sourcing, is given by adding the resistance of the lead cables

(approximately 0.1 ohms) to the sourced resistance signal. For the sourcing of precise resistance signals, use three-wire

or four-wire connections.

Step 1: Using the function key (FUNC), select the RTD function. Using the (RANGE) key, select a RTD range (PT100,

PT200, PT500, PT1000, Cu10, Cu50). The selected function, the default range source value, and the unit of measure are

shown in the lower area of the LCD.

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

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 changes the digit in question quickly. And 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 SOURCE indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator

sources the preset resistance value between the output terminals.

Step 4: To switch OFF the output, press (ON) again. The ‘’OFF‘’ icon appears on the LCD and no signals are sourced

between the terminals. The connection methods based on three-wire and four-wire are shown in Figure 9.

Note: The RTD source function is unavailable if the TC /RTD measurement function is ON.

7.6.1 Temperature Monitor Function

The calibrator offers a temperature monitor function for easily observing the resistance value sourced between the output

terminals. In the RTD source mode, press the (START) key and the LCD will show the resistance value sourced between the

output terminals. Press (START) again and the LCD will show the preset temperature value.

Page 16 PRC70-EN-V2.1 12/11

7.7 Sourcing Frequency

The calibrator can source a constant pulse signal according to the preset frequency and amplitude.

Step 1: Using the function selector switch (FUNC), select the frequency source function. The LCD shows the default

frequency value (10 Hz) and the frequency symbol

Step 2: Using the (RANGE) key, select a frequency range (100Hz, 1KHz, 10Hz, 100KHz). The selected function, the default

range source value, and the unit of measure are shown in the lower area of the LCD.

Step 3: Set the output value digit by digit using each pair of〔S〕/〔T〕output setting 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 changes the digit quickly. The value won’t

change if it is increased or decreased to the Maximum or Minimum value.

Step 4: Pressing the〔VPEAK〕key once switches to the amplitude setting mode. The LCD shows a reading of 1V.

Step 5: Set the output value digit by digit using each pair of〔S〕/〔T〕output setting 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 changes the digit quickly. The value won’t

change if it is increased or decreased to the Maximum or Minimum value.

Step 6: To re-enter the frequency set mode and set the frequency, press the〔FREQ〕key.

Step 7: Pressing the (ON) key causes the SOURCE indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’. The calibrator

sources constant pulse signals between its output terminals according to preset frequency and amplitude.

Step 8: To switch OFF the output, press the (ON) key again. The ‘’OFF‘’ icon appears on the LCD and no signals are

sourced between the terminals.

in the lower LCD area.

7.8 Sourcing a Number of Pulses

The calibrator can source a preset number of pulse signal according to the preset frequency and amplitude.

Step 1: Using the function selector switch (FUNC), select the pulse source function. The LCD shows the default value (10

Hz) and the pulse icon

Step 2: Using the (RANGE) key, select a frequency range. The selected function, the default range source value, and the

unit of measure are shown in the lower portion of the LCD.

Step 3: Set the output value digit by digit using each pair of〔S〕/〔T〕output setting 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 changes the digit quickly. The value won’t

change if it is increased or decreased to the Maximum or Minimum value.

.

Page 17 PRC70-EN-V2.1 12/11

Step 4: Pressing the〔VPEAK〕key once switches to the amplitude setting mode. The LCD shows a reading of 1V.

Step 5: Set the output value digit by digit using each pair of 〔S〕/〔T〕output setting 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 changes the digit quickly. The value won’t

change if it is increased or decreased to the Maximum or Minimum value.

Step 6: Press the (CYC) key to enter the pulse number set mode; the LCD will show the default value (1 CYC).

Step 7: Set the output value digit by digit using each pair of〔S〕/〔T〕output setting 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 changes the digit quickly. The value won’t

change if it is increased or decreased to the Maximum or Minimum value.

Step 8: To re-enter the frequency set mode, press the〔

FREQ〕key.

Step 9: Pressing the (ON) key causes the SOURCE indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’, and the

calibrator sources low level signals between its output terminals.

Step 10: Press the (START) key to allow the calibrator to source the set number of pulses according to the preset frequency

and amplitude, the LCD will show the “RUN” icon.

Step 11: When source is complete, the calibrator automatically switches the output OFF and ceases operation. The “RUN”

symbol also switches OFF.

Step 12: To switch OFF the output manually, press the (ON) key again. The ‘’OFF‘’ icon appears on the LCD and no signals

will be sourced between the terminals.

Notes:

z The frequency range of the pulse can only be changed by pressing (RANGE) in the frequency set mode.

z When the “RUN” symbol switches OFF, the user can change the frequency and amplitude when the source function is

in ‘’ON ‘’ or ‘’OFF‘’.

z During the pulse sourcing process, pressing the (START) key causes the calibrator to switch the output OFF; the “RUN”

icon switches OFF also. Press the (START) key again to restart the sourcing function.

z Restarting the pulse output requires that the source function be in the ‘’ON ‘’state.

Page 18 PRC70-EN-V2.1 12/11

7.9 Sourcing Contact Output

Switch the output terminals ON or OFF using the contact output function. The contact-switching device is an FET.

Step 1: Using the function key (FUNC), select the contact output source function. The LCD shows the default value (10Hz)

and the “

Step 2: Using the (RANGE) key, select a frequency (100Hz, 1KHz, 10 KHz, 100KHz).

Step 3: Set the output value digit by digit using each pair of〔S〕/〔T〕output setting 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 changes the digit quickly. The value won’t

change if it is increased or decreased to the Maximum or Minimum value.

Step 4: Pressing the (ON) key causes the SOURCE indicator on the LCD to change from ‘’OFF‘’ to ‘’ON ‘’.

Step 5: To switch the output OFF, press the (ON) key again. The ‘’OFF‘’ icon appears on the LCD and signals sourced

between its terminals will be switched OFF.

Notes:

z The contact output source function is unavailable if the frequency measurement function is ON.

z The amplitude and pulse number cannot be set when in the contact output mode.

z The contact output is polarized. Generally, connect the positive polarity with the high (H) jack of the calibrator and the

negative polarity with the low (L) jack.

z Note that the maximum allowable current for the contact output is 50mA.

“ switch symbol.

7.10 Zero-off function

For any DC voltage, DC current, Resistance (ohms), TC (thermocouple) or RTD range, pressing the (ZERO) key initializes

the preset source value.

In the frequency, pulse, and contact output modes, the (ZERO) key is unavailable.

Page 19 PRC70-EN-V2.1 12/11

8 Measurement

The calibrator measures DC voltage, DC current, resistance, thermocouple, RTD, frequency, continuity, switch and pressure.

Warning

z In applications where the calibrator is used together with the supplied test lead cables for measurement, the allowable

voltage to ground of the input terminals is 60V maximum. To avoid electrical shock, do NOT use the calibrator at

voltages exceeding the maximum voltage to ground.

z The allowable voltage to ground when the supplied thermocouple convertor is attached to the input terminals is 60V

peak maximum. To avoid electrical shock, do not use the terminal adapter for measuring circuit voltage exceeding the

maximum voltage to ground.

Notes:

z When switching the calibrator ON, the measurement function is in the OFF mode to save battery power. Press the (ON)

key to enable the desired function.

z When in the mA source mode and using the auto-sweeping mode, the measurement function cannot be started by

pressing the (ON) key (the LCD will indicate the “NO. OP” error).

z Using the〔HOLD〕key, the measured value can be frozen on the display.

z Switch OFF the MEASURE mode by pressing the (ON) key when the meter is be unused for a period of time. The

measured value shown on the LCD switches OFF and power to the internal measuring circuit is switched OFF. This

saves on battery power.

z The LCD shows all dashes “- - - - -“on the upper area when the range is changed by the user. If the input is over loaded

(over range), the measured value on the LCD indicates “oL”.

8.1 Connecting Cables to Terminals

For DC voltage, Ohm, frequency, continuity, or switch mode (Figure 11)

Step 1: Connect the black test lead cable for measurement to the “COM” input terminal and the red test lead cable to the

”VHzTc ΩRTD” input terminal.

Figure 11 - Measuring DC voltage, ohms, frequency, continuity and switch

Step 2: Connect the other end of the cables to the terminal points of the equipment under test while ensuring that the

polarities are correct.

Page 20 PRC70-EN-V2.1 12/11

For DC current signals (refer to Figure 12)

Step 1: Connect the black test lead cable for measurement to the “COM” input terminal and the red test lead cable to the

“mA” input terminal.

Step 2: Connect the other end of the cable to the measuring terminals of the equipment under test ensuring that the

polarities are correct.

Figure 12 - Measuring DC current

For thermocouple signals (refer to Figure 13)

Step 1: Connect the thermocouple convertor to the input terminals.

Step 2: Connect between the TC terminals. The positive output lead wire of the thermocouple to the H terminal of the

thermocouple convertor and the negative output lead wire of the thermocouple to the L terminal.

Figure 13 - Measuring TC (thermocouple temperature)

Three wire connection method for RTD signals (Figure 14)

Step 1: Connect one black lead cable for measurement to the “COM” input terminal and another black lead to the “3W”

terminal. Connect the red lead cable to the “VHzTcΩRTD” input terminal.

Step 2: Connect the three clips of the cables to the measuring terminals of the equipment under test ensuring that the

polarities are correct.

Figure 14 - RTD signal with 3w method

Page 21 PRC70-EN-V2.1 12/11

Warning

z Before connecting the calibrator to the device under test, switch OFF the power to the device.

z Do not apply voltage or current exceeding the allowable voltage (60 V) or current (55 mA). Exceeding the limits will

endanger instrument and also create a risk of personal injury due to electrical shock.

z Mistaking the H voltage input terminal for the mA current input terminal, and vice versa, when wiring, is extremely

dangerous. Take great care in making connections and always double check the accuracy of the connection

configuration.

z The current input terminals are equipped with a built-in current input protection fuse. Over-current input to the terminals

will cause the fuse to blow. If the fuse is blown, replace it following specified ratings. For details on fuse replacement,

see the “Replacing the battery and fuse” section.

Warning

Wiring or operational errors can lead to damage to the instrument and personal injury due to electrical shock. Exercise the

utmost care when carrying out the measurement tasks.

8.2 Measuring DC Voltage

Step 1: Ensure that the test lead cables are not connected to the instrument or device under test.

Step 2: Using the function key (FUNC), select the DC Voltage measurement function.

Step 3: Connect the test lead cables to the terminals of the instrument under test.

Step 4: Using the (RANGE) key, select a range from 50mV, 500mV, 5V, 50V. The selected function, the measured value,

and the unit of measure are shown in the upper area of the LCD.

8.3 Measuring DC Current

Step 1: Ensure that the test lead cables are not connected to the instrument or device under test.

Step 2: Using the function key (FUNC), select the DC Current measurement function.

Step 3: Connect the test lead cables to the measuring terminals of the instrument under test.

Step 4: The selected function, the measured value, and the unit of measure are shown in the upper area of the LCD.

87.3.1 mA % Display

In the mA measurement mode, pressing the (RANGE) key converts the measured value to the mA% mode (shown on

the upper area of the LCD). See the equation below.

100 (current measured value mA-4mA)

mA %= %

16 mA

Press the

(RANGE) key again to return to the measured value, shown on the upper area of the LCD.

Page 22 PRC70-EN-V2.1 12/11

8.3.2 Using the Calibrator as a 24-V Loop Power Supply

This function helps to switch ON a 24V loop power supply connected in line with the measured DC current circuit. The

calibrator can be used as a loop power supply for calibrating 2-wire converters:

Step 1: When the calibrator is in the current measurement mode, pressing the〔LOOP〕key causes the LCD to show the

LOOP symbol and the built-in 24V loop power of the calibrator will be switched ON.

Step 2: Connect the calibrator with the loop current terminals of the converter as shown in Figure 15.

Figure 15 – A 24v loop power circuit supply

Note: Since the function discussed above requires a significant amount of DC current (25 mA), battery operation will reduce

the battery life considerably.

8.4 Measuring Resistance

Step 1: Ensure that the test lead cables are not connected to the instrument under test.

Step 2: Using the function key (FUNC), select the resistance measurement function.

Step 3: Connect the test lead cables to the measuring terminals of the instrument under test as shown in Figure 11.

Step 4: Using the measurement (RANGE) key, select the desired range 500Ω or 5KΩ.The selected function, the measured

value, and the unit of measure are shown in the upper area of the LCD.

8.5 Measuring Temperature with a Thermocouple (TC)

Step 1: Ensure that the test lead cables are not connected to the instrument under test.

Step 2: Using the function key (FUNC), select the TC measurement function. Use the measurement (RANGE) key to select

the thermocouple type: K, E, J, T, B, N, R, or S.

Step 3: Connect the thermocouple convertor to the jack under test as shown in Figure 13.The selected function, the

measured value, and the unit of measure are shown in the upper area of the LCD.

Notes:

z The TC measurement function is unavailable if the TC/RTD source function is ON.

z If there has been a sudden change in the operating ambient temperature of the calibrator, wait until the built-in reference

Page 23 PRC70-EN-V2.1 12/11

junction compensation stabilizes.

8.5.1 Using the RJ sensor

Use the RJ-ON key to turn the Resistance Junction Temperature compensation ON or OFF. With the temperature

compensation ON, the display will show the RJ-ON icon and the internal temperature (top right of the LCD).

8.5.2 Temperature Monitor Function

The calibrator offers a temperature monitoring function to observe the voltage value measured from the input terminals. In

the TC measurement mode, pressing the (T.DISPLAY) key shows the voltage value measured. Pressing the key again

shows the measured temperature value.

8.6 Measuring Temperature with an RTD

Step 1: Ensure that the test lead cables are not connected to the instrument under test.

Step 2: Using the function key (FUNC), select the RTD measurement function.

Step 3: Connect the test lead cables to the terminals of the instrument under test as shown in Figure 14.

Step 4: Using the measurement (RANGE) key, select the desired range from PT100, PT200, PT500, PT1000, Cu10, and

C50.The selected function, the default measured value, and the unit of measure are displayed.

Notes:

z The RTD measurement function is unavailable if the TC /RTD source function is ON.

z The calibrator defaults to the 3-wire connection method when measuring RTD. When using the 2-wire connection

method, pay special attention to linking (shorting) the “COM” and “LOOP” terminals.

7.6.1 Temperature Monitor Function

The calibrator offers a temperature monitoring function to observe the resistance value measured from the input terminals. In

the TC measurement mode, pressing the (T.DISPLAY) key shows the resistance value measured from the input terminals.

Pressing the key again shows the measured temperature value.

8.7 Measuring Frequency

Step 1: Ensure that the test lead cables are not connected to the instrument under test.

Step 2: Using the function key (FUNC), select the frequency measurement function.

Step 3: Connect the test lead cables to the measuring terminals of the instrument under test.

Step 4: Using the measurement (RANGE) key, select the suitable range (500Hz, 5KHz, 50KHz).The selected function, the

measured value, and the unit of measure are shown in the upper part of the LCD.

Note: The frequency measurement function is unavailable if the frequency, pulse, contact or pressure source function is ON.

Page 24 PRC70-EN-V2.1 12/11

8.8 Measuring switch

The calibrator can measure the opening and closing of a dry contact switch. Using the function key (FUNC), select the switch

measurement function. The LCD displays the switch symbol
second if the state of the switch changes (opens or closes).

”on the upper area. The beeper sounds for one

8.9 Measuring Continuity

Continuity measurements are used to detect the completeness of a circuit or wire (e.g. a resistance smaller than 50 ohms).

Using the function selector switch (FUNC), select the continuity measurement function. The LCD displays the continuity

symbol “

loop circuit resistance is smaller than 50Ω; The LCD shows the measured resistance.

”on the upper area. Connect the devices as shown in Figure 11, and the beeper will sound continuously if the

8.10 Measurement-filtering function

Selecting the measurement-filtering function stabilizes the measured value displayed on the LCD. In the DCV, DCmA, OHM,

TC, RTD modes pressing (AVG) key causes a calculation for the average of the samples. The LCD shows the “AVG”

symbol. Pressing the (AVG) key again cancels the calculation and the “AVG” symbol switches OFF.

8.11 Measured Value HOLD function

Apart from the continuity and switch measurement functions, the HOLD function can be used to freeze the measured value

on the upper part of LCD. Pressing the (HOLD) key activates the HOLD mode, and the LCD displays the “HOLD” symbol. To

exit HOLD mode, press the (HOLD) key again; the “HOLD” symbol switches OFF.

9 Environmental Temperature Test

The calibrator can measure the surrounding environmental temperature, and display it on the top right corner of the LCD.

After switching the calibrator ON, press the (TEMP) key to display the temperature value and the unit of measure at the top

right corner of the LCD. Press again to cancel the measurement.

10 Programming the Calibrator’s Global Settings

Press and hold the (HOLD) key while switching the meter ON. Release the (HOLD) key when “SPFC” is shown on the top

right corner of the LCD. The following parameters can be programmed by the user. The top row of the LCD display shows

the parameter name; the bottom row of the LCD shows the setting. Use the MEAURE (ON) key to scroll the parameters and

then follow the instructions below to configure each parameter.

10.1 Setting Auto-power off time

Step 1: Use the MEASURE (ON) key to display the “AP.OFF” parameter at the top of the LCD (if it’s not already displayed).

Step 2: Set the time from 0-60 minutes using the second pair of 〔S〕/〔T〕keys counting right to left. Each press of the

〔S〕/〔T〕key equals one 10 -minute increment or decrement. Press and hold a key to scroll quickly.

Step 3: To save the setting, press and hold the SOURCE (ON) key until the LCD shows the “SAVE” symbol.

Note: The default value (0) indicates that the automatic power-off function is disabled.

Page 25 PRC70-EN-V2.1 12/11

10.2 Setting Backlight time

Step 1: Use the MEASURE (ON) key to display the “BL.OFF” parameter at the top of the LCD (if it’s not already displayed).

Step 2: Set the time using the 〔S〕/〔T〕keys (the unit of measure for the time is ‘seconds’ and the range is 0-3600

seconds). 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

quickly. The value won’t change if it is increased or decreased to the Maximum or Minimum value.

Step 3: To save the setting, press and hold the SOURCE (ON) key until the LCD shows the “SAVE” symbol.

Notes: When the default value is 0, the backlight will not switch OFF automatically.

10.3 Setting the temperature units

Step 1: Use the MEASURE (ON) key to display the “TEP.U” parameter at the top of the LCD (if it’s not already displayed).

Step 2: Shift between degrees C and F using the right pair of 〔S〕/〔T〕keys.

Step 3: To save the setting, press and hold the SOURCE (ON) key until the LCD shows the “SAVE” symbol.

10.4 Setting frequency

Step 1: Use the MEASURE (ON) key to display the “FrSEt” parameter at the top of the LCD (if it’s not already displayed).

Step 2: Shift between 50Hz and 60Hz using the right pair of 〔S〕/〔T〕keys.

Step 3: To save the setting, press and hold the SOURCE (ON) key until the LCD shows the “SAVE” symbol.

10.5 Setting CMSET

Step 1: Use the MEASURE (ON) key to display the “CMSEt” parameter at the top of the LCD (if it’s not already displayed).

Step 2: For this meter, ensure that “DPM” is selected from the list (PCM, DPM, CAT) using the right pair of arrow keys 〔S

〕/〔T).

Step 3: To save the setting, press and hold the SOURCE (ON) key until the LCD shows the “SAVE” symbol.

10.6 Factory default

Step 1: Use the MEASURE (ON) key to display the “FACry” parameter at the top of the LCD (if it’s not already displayed).

Step 2: Press the SOURCE (ON) key to revert to the default values as shown below:

AP.OFF: 10 minutes

BL.OFF: 10 seconds

TMP.U: Ԩ

FRSET: 50 Hz

CMSET: PCM

Page 26 PRC70-EN-V2.1 12/11

11 Calibration

Please contact Extech Instruments Corporation for instructions on returning the unit for calibration.

12 Replacing the Batteries or Fuses:

Warning

To avoid possible electric shock, remove the test leads from the calibrator before open the battery door and ensure that the

battery door is tightly closed before switching the calibrator ON.

Caution

z To avoid battery leakage and possible explosion ensure correct battery polarity.

z Do not short circuit the battery.

z Do not disassemble, heat, or expose batteries to fire.

z When replacing the batteries, use only the specified type.

z Remove the batteries if the meter is to be stored for a long period.

Step 1: Remove the test leads and charger before replacing the batteries or fuses, and switch OFF the meter.

Figure 16 - Replacing batteries and fuses

Step 2: Remove the protector as shown in Figure 16. With a standard blade screwdriver, turn each battery door screw a

quarter turn counter-clockwise to remove the battery door.

Step 3: Replace with four (4) new AAA alkaline batteries using the instructions shown on the battery door. Replace the

blown fuses with same type F1 (50mA/250V) or F2 (63mA/250V).

Step 4: Reinstall and tighten the battery door, affix the protector before using the meter.

Page 27 PRC70-EN-V2.1 12/11

13 Maintenance

13.1 Cleaning the calibrator

Warning

To avoid electrical shock or damage to the meter, service the meter with specified replacement parts only and do not allow

water to enter the meter housing.

Caution

To avoid damaging the plastic lens and case, do not use solvents or abrasive cleansers.

Clean the Calibrator with a soft cloth dampened with water or water and mild soap.

13.2 Calibration, Repair, and Technical Support 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 to verify

Technical Support: Extension 200; E-mail: [e-mail]

Repair & Returns: Extension 210; E-mail: [e-mail]

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

Support line [phone]

ISO9001 Certified

Page 28 PRC70-EN-V2.1 12/11

14 Specifications

General Specifications for Measurement Mode; these specifications assume:

• A 1-year calibration cycle

• An operating temperature of 18°C to 28°C

• Relative humidity of 35% to 70% (non condensing)

Accuracy is expressed as ± (percentage of reading + percentage of range)

Function Reference Range Resolution Accuracy Remark

DCV

DCmA

OHM

FREQ

TC



50mV

500mV

5V

50V

50mA

500Ω
Test Current:

Approx. 1mA

5KΩ
Test Current:
Approx. 0.1mA

500Hz

5KHz

50KHz

R

S

K

E

J

T

N

B

-5.000mV～55.000mV

-50.00mV～550.00mV

-0.5000V～5.5000V

-5.000V～55.000V

-5.000mA～55.000mA

0.00Ω～550.00Ω

0.0000 KΩ～5.5000KΩ

3Hz～500.00Hz

3Hz～5.0000KHz

3Hz～50.000KHz

32°F to 3212°F

0°C to 1767°C

32°F to 3212°F

0°C to 1767°C

-148°F to 2501.6°F

-100.0°C to 1372.0°C

-58.0°F to 1832.0°F

-50.0°C to 1000.0°C

-76.0°F to 2192.0°F

-60.0°C to 1200.0°C

-148.0°F to 752.0°F

-100.0°C to 400.0°C

-328.0°F to 2372.0°F

-200.0° to 1300.0°C

1112°F to 3308°F

600°C to 1820°C

1μV 0.02 rdg + 0.02 range

10μV 0.02 rdg +0.01 range

0.1mV 0.02 rdg +0.01 range

1mV 0.03 rdg +0.01 range

1μA 0.02 rdg +0.01 range Shunt Resistance: 10Ω

0.01Ω 0.05 rdg +0.02 range

0.1Ω 0.05 rdg +0.02 range

0.01Hz

0.1Hz

1Hz

1.8°F (1°C)

0.1°F (0.1°C)

1°F (1°C)

±2 digits

32°F to 932°F: 3.2°F

932°F to 3212°F: 2.7°F

0 to 500°C: 1.8°C

500 to 1767°C: 1.5°C

-148.0°F to 32.0°F: 2.2°F

32.0°F to 2501.0°F: 1.4°F

-100.0°C to 0.0°C: 1.2°C

0.0°C to 1372.0°C: 0.8°C

-58.0°F to 32.0°F: 1.6°F

32.0°F to 1832.0°F: 2.7°F

-50.0°C to 0.0°C: 0.9°C

0.0°C to 1000.0°C: 1.5°C

-76.0°F to 32.0°F: 1.8°F

32.0°F to 2192.0°F: 1.3°F

-60.0°C to 0.0°C: 1.0°C

0.0°C to 1200.0°C: 0.7°C

-148.0°F to 32.0°F: 1.8°F

32.0°F to 752.0°F: 1.3°F

-100.0°C to 0.0°C: 1.0°C

0.0°C to 400.0°C: 0.7°C

-328.0°F to 32.0°F: 2.7°F

32.0°F to 2372.0°F: 1.6°F

-200.0°C to 0.0°C: 1.5°C

0.0°C to 1300.0°C: 0.9°C

1112°F to 1472°F: 4.0°F

1472°F to 1832°F: 3.2°F

1832°F to 3308°F: 2.5°F

600°C to 800°C: 2.2°C

800°C to 1000°C: 1.8°C

1000°C to 1820°C: 1.4°C

Input Resistance: 100MΩ

Input Resistance: 1MΩ

Open Circuit Voltage: 2.5V approx.
Does not include lead resistance

Input Impedance：100kΩ min.

Sensitivity：3Vp-p min.

Duty Cycle: 50%

ITS-90 temperature scale;
Accuracy does not include the error

of the internal temperature
compensation caused by the sensor

Page 29 PRC70-EN-V2.1 12/11



Function Reference Range Resolution Accuracy Remark

RTD

SWITCH

CONT.

Pt100
385

Pt1000
385

Pt200
385

Pt500
385

Cu10

Cu50

CLOSE / OPEN

500Ω

-328.0°F to 1472.0°F

-200.0°C to 800.0°C

-328.0°F to 1166.0°F

-200.0°C to 630.0°C

-328.0°F to 1166.0°F

-200.0°C to 630.0°C

-328.0°F to 1166.0°F -

200.0°C to 630.0°C

-148.0°F to 500.0°F

-100.0°C to 260.0°C

-58.0°F to 302.0°F

-50.0°C to 150.0°C

≤50Ω sound Approx. 1mA Test Current

0.1°F (0.1°C)

-328.0°F to 32.0°F: 0.9°F

32.0°F to 752.0°F: 1.3°F

752.0°F to 1472.0°F: 1.4°F

-200.0°C to 0.0°C: 0.5°C

0.0°C to 400.0°C: 0.7°C

400.0°C to 800.0°C: 0.8°C

-328.0°F to 212.0°F: 0.5°F

212.0°F to 572.0°F: 0.9°F

572.0°F to 1166.0°F: 1.3°F

-200.0°C to 100.0°C: 0.3°C

100.0°C to 300.0°C: 0.5°C

300.0°C to 630.0°C: 0.7°C

-328.0°F to 212.0°F: 1.4°F

212.0°F to 572.0°F: 1.6°F

572.0°F to 1166.0°F: 1.8°F

-200.0°C to 100.0°C: 0.8°C

100.0°C to 300.0°C: 0.9°C

300.0°C to 630.0°C: 1.0°C

-328.0°F to 212.0°F: 0.7°F

212.0°F to 572.0°F: 0.9°F

572.0°F to 1166.0°F: 1.3°F

-200.0°C to 100.0°C: 0.4°C

100.0°C to 300.0°C: 0.5°C

300.0°C to 630.0°C: 0.7°C

3.2°F (1.8°C)

1.3°F (0.7°C)

Pt100-385 curve standard
Does not include lead resistance.

Approximately 1mA Test Current
Short circuit display : CLOSE
Open circuit display: OPEN
Threshold value approx.200~300Ω

Notes:

Reading Rate

Measurement function Rate

DCV, DCA, OHM, TC 2 Readings per second approx.

RTD 1 Reading per second approx.

FREQUENCY 0.5 Readings per second approx.

CONTINUITY 4 Readings per second approx.

z DCV: Normal Mode Rejection Ratio (NMRR) ≥60dB (at 50Hz or 60Hz); Common Mode Rejection Ratio (CMRR) ≥120 dB(at

50Hz or 60Hz)

z Temperature Coefficient: 0.1 times the applicable accuracy specification per degree C for 5Ԩ to 18Ԩ and 28Ԩ to 40Ԩ

Page 30 PRC70-EN-V2.1 12/11

z The range of the internal temperature compensation sensor is from -10Ԩ to 50Ԩ, compensation error≤0.5Ԩ

z Maximum voltage between VΩHz terminal and COM terminal: 60 Vp-p; Maximum Input current: 60mA.

Protected with a 63mA, 250V fast blow fuse

Page 31 PRC70-EN-V2.1 12/11

General Specifications for Source Mode

These specifications assume:

• 1-year calibration cycle

• Operating temperature of 18

°C to 28°C (64.4°F ~82.4°F)

• Relative humidity of 35% to 70% (non condensing)

Accuracy is expressed as ± (percentage of set value + percentage of range)

Function Reference Range Resolution Accuracy Remark

DC voltage

DC current

Resistance

TC

100mV

1V

10V

20mA

400Ω

4KΩ

40KΩ

R

S

K

E

J

T

N

-10.000mV～110.000mV

-0.10000V～1.10000V

-1.0000V～11.0000V

0.000mA～22.000mA

0.00Ω～400.00Ω

0.0000 KΩ～4.0000 KΩ

0.000 KΩ～40.000 KΩ

32°F to 3212°F

0°C to 1767°C

32°F to 3213°F

0°C to 1767°C

-328°F to 2501.6°F

-200.0°C to 1372.0°C

-328.0°F to 1832.0°F

-200.0°C to 1000.0°C

-328.0°F to 2192.0°F

-200.0°C to 1200.0°C

-418.0°F to 752.0°F

-250.0°C to 400.0°C

-328.0°F to 2372.0°F

-200.0° to 1300.0°C

1μV 0.02 rdg +0.01 range Maximum output current: 0. 5mA

10μV 0.02 rdg +0.01 range Maximum output current: 2mA

0.1mV 0.02 rdg +0.01 range Maximum output current: 5mA

External supply for simulate mA: 5V–

1μA 0.02 rdg +0.02 range

0.01Ω 0.02 rdg +0.02 range

0.1Ω 0.05 rdg +0.025 range

1Ω 0.1 rdg +0.1 range

32°F to 212°F: 2.7°F

1°F (1°C)

0.1°F (0.1°C)

212°F to 3212°F: 2.2°F

0°C to 100°C: 1.5°C

100°C to 1767°C: 1.2°C

-328.0°F to -148.0°F: 1.1°F

-148.0°F to 752.0°F: 0.9°F

752.0°F to 2192.0°F: 1.3°F

2192.0°F to 2501.0°F: 1.6°F

-200.0°C to -100.0°C: 0.6°C

-100.0°C to 400.0°C: 0.5°C

400.0°C to 1200.0°C: 0.7°C

1200°C to 1372.0°C: 0.9°C

-328.0°F to -148.0°F: 1.1°F

-148.0°F to 1112.0°F: 0.9°F

1112.0°F to 1832.0°F: 0.7°F

-200.0°C to -100.0°C: 0.6°C

-100.0°C to 600.0°C: 0.5°C

600.0°C to 1000.0°C: 0.4°C

-328.0°F to -148.0°F: 1.1°F

-148.0°F to 1472.0°F: 0.9°F

1472.0°F to 2192.0°F: 1.3°F

-200.0°C to -100.0°C: 0.6°C

-100.0°C to 800.0°C: 0.5°C

800.0°C to 1200.0°C: 0.7°C

1.1°F (0.6°C)

-328.0°F to -148.0°F: 1.8°F

-148.0°F to 1652.0°F: 1.3°F

1652.0°F to 2372.0°F: 1.4°F

-200.0°C to -100.0°C: 1.0°C

-100.0°C to 900.0°C: 0.7°C

900.0°C to 1300.0°C: 0.8°C

28V
Maximum load 1KΩ at 20mA

Excitation current: ± 0.5–3 mA;
if ± 0.1–0.5, add 0.1Ω;
Accuracy does not include lead

resistance;

Excitation current: ±0.05 –0.3mA;
Does not include lead resistance;

Excitation current: ±0.01mA;
Does not include lead resistance;

Using ITS-90 temperature scale;
The accuracy does not include the

error of internal temperature
compensation caused by a sensor.

Page 32 PRC70-EN-V2.1 12/11

1112°F to 1472°F: 2.7°F

RTD

FREQ

PULSE

SWITCH

LOOP

B

Pt100-385

Pt200-385

Pt500-385

Pt1000-385

Cu10

Cu50

100Hz

1KHz

10KHz

100KHz

100Hz

1KHz

10KHz

100Hz

1KHz

10KHz

100KHz

24V ±10%

1112°F to 3308°F

600°C to 1820°C

-328.0°F to 1472.0°F

-200.0°C to 800.0°C

-328.0°F to 1166.0°F

-200.0°C to 630.0°C

-328.0°F to 1166.0°F

-200.0°C to 630.0°C

-328.0°F to 1166.0°F -

200.0°C to 630.0°C

-148.0°F to 500.0°F

-100.0°C to 260.0°C

-58.0°F to 302.0°F

-50.0°C to 150.0°C

1.00Hz～110.00Hz

0.100KHz～1.100KHz

1.0KHz～11.0KHz

1KHz～110KHz

1~100000 cyc 1 cyc ±2 counts

1.00Hz～110.00Hz

0.100KHz～1.100KHz

1.0KHz～11.0KHz

1KHz～110KHz

1.8°F (1°C)

0.1°F (0.1°C)

0.01 Hz

1Hz

0.1KHz

2KHz ±5 counts

0.01Hz

1Hz

0.1KHz

2KHz ±5 counts

1472°F to 3308°F: 2.0°F

600°C to 800°C: 1.5°C

800°C to 1820°C: 1.1°C

-328.0°F to 32.0°F: 0.5°F

32.0°F to 752.0°F: 0.9°F

752.0°F to 1472.0°F: 1.4°F

-200.0°C to 0.0°C: 0.3°C

0.0°C to 400.0°C: 0.5°C

400.0°C to 800.0°C: 0.8°C

-328.0°F to 212.0°F: 1.4°F

212.0°F to 572.0°F: 1.6°F

572.0°F to 1166.0°F: 1.8°F

-200.0°C to 100.0°C: 0.8°C

100.0°C to 300.0°C: 0.9°C

300.0°C to 630.0°C: 1.0°C

-328.0°F to 212.0°F: 0.7°F

212.0°F to 572.0°F: 0.9°F

572.0°F to 1166.0°F: 1.3°F

-200.0°C to 100.0°C: 0.4°C

100.0°C to 300.0°C: 0.5°C

300.0°C to 630.0°C: 0.7°C

-328.0°F to 212.0°F: 0.4°F

212.0°F to 572.0°F: 0.9°F

572.0°F to 1166.0°F: 1.3°F

-200.0°C to 100.0°C: 0.2°C

100.0°C to 300.0°C: 0.5°C

300.0°C to 630.0°C: 0.7°C

3.3°F(1.8°C)

1.1°F (0.6°C)

±2 counts

±2 counts

Notes:

z Temperature Coefficient: 0.1 times the applicable accuracy specification per degree C from 5

z Range of the internal temperature compensation sensor: -10

°C to 50°C

Maximum voltage between any output terminal and earth ground: 30Vpk

Maximum output current: Approximately 25mA.

Copyright © 2011 Extech Instruments Corporation (a FLIR company)

All rights reserved including the right of reproduction in whole or in part in any form.

Pt100-385
Excitation current: ±0.5～±3mA for

Pt100, Cu10, Cu50;

Excitation current: ±0.05mA～±0.3mA
for PT200, PT500, PT1000;

Does not include lead resistance.

Output voltage: +1~+11 V
based waveform);

Amplitude accuracy: ±(5% +0.5V);
Maximum load: >100 KΩ;
Duty Cycle: 50%.

FET switch
Maximum open/close voltage: +28 V
Maximum open/close current: 50mA

Maximum current: 22 mA
Short circuit protected

°C to 18°C and 28°C to 40°C.

(zero

p-p

Page 33 PRC70-EN-V2.1 12/11