Fluke 9102S/725-KIT User manual

9102S

Dry-Well Calibrator

Users Guide

9102S___ugeng0000

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Limited Warranty & Limitation of Liability

Each product from Fluke Corporation (“Fluke”) is warranted to be free from defects in material and
workmanship under normal use and service. The warranty period is one year for Dry-Well Calibrators. The
warranty period begins on the date of the shipment. Parts, product repairs, and services are warranted for 90
days. The warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller,
and does not apply to fuses, disposable batteries or to any other product, which in Fluke’s opinion, has been
misused, altered, neglected, or damaged by accident or abnormal conditions of operation or handling. Fluke

warrants that software will operate substantially in accordance with its functional specications for 90 days

and that it has been properly recorded on non-defective media. Fluke does not warrant that software will be
error free or operate without interruption. Fluke does not warrant calibrations on the Field Metrology Well.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable
international price. Fluke reserves the right to invoice Buyer for importation costs of repairs/replacement
parts when product purchased in one country is submitted for repair in another country.

Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price, free of charge
repair, or replacement of a defective product which is returned to a Fluke authorized service center within
the warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center or send the product, with
a description of the difculty, postage, and insurance prepaid (FOB Destination), to the nearest Fluke au­thorized service center. Fluke assumes no risk for damage in transit. Following warranty repair, the product

will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that the failure was

caused by misuse, alteration, accident or abnormal condition or operation or handling, Fluke will provide an
estimate or repair costs and obtain authorization before commencing the work. Following repair, the product
will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return

transportation charges (FOB Shipping Point).

THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTH­ER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE
SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL. OR CONSEQUENTIAL
DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, WHETHER ARISING FROM BREACH OF
WARRANTY OR BASED ON CONTRACT, TORT, RELIANCE OR ANY OTHER THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or

limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court of compe­tent jurisdiction, such holding will not affect the validity or enforceability of any other provision.

Specifications subject to change without notice. • Copyright © 2005 • Printed in USA

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i

Table of Contents

1 Before You Start .......................................................................1

1.1 Introduction ............................................................................................... 1

1.2 Symbols .................................................................................................... 2

1.3 Safety Information ..................................................................................... 3

1.3.1 WARNINGS ...............................................................................................3

1.3.2 CAUTIONS ................................................................................................5

1.4 Authorized Service Centers ...................................................................... 6

2 Specications and Environmental Conditions ......................9

2.1 Specifications ........................................................................................... 9

2.2 Environmental Conditions ......................................................................... 9

3 Quick Start .............................................................................. 11

3.1 Unpacking .............................................................................................. 11

3.2 Set-up ..................................................................................................... 11

3.3 AC Power Operation ............................................................................... 11

3.4 DC Power Operation ............................................................................... 12

3.5 Setting the Temperature .......................................................................... 12

4 Parts and Controls .................................................................13

4.1 Rear Panel .............................................................................................. 13

4.2 Front Panel .............................................................................................. 14

4.3 Accessories ............................................................................................ 15

5 General Operation ..................................................................17

5.1 Setting the Temperature .......................................................................... 17

5.2 Changing Display Units .......................................................................... 17

6 Controller Operation ..............................................................19

6.1 Well Temperature .................................................................................... 19

6.2 Temperature Set-point ............................................................................ 19

6.2.1 Programmable Set-points .............................................................................19

6.2.2 Set-point Value ..............................................................................................21

6.2.3 Temperature Scale Units ...............................................................................21

6.3 Scan ........................................................................................................ 22

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9102S Dry-Well Calibrator

ii

6.3.1 Scan Control .................................................................................................. 22

6.3.2 Scan Rate ......................................................................................................22

6.4 Set-point Resistance ............................................................................... 22

6.5 Secondary Menu..................................................................................... 23

6.6 Heater Power .......................................................................................... 23

6.7 Proportional Band ................................................................................... 24

6.8 Controller Configuration .......................................................................... 25

6.9 Operating Parameters ............................................................................ 25

6.10 High Limit ................................................................................................ 25

6.11 Serial Interface Parameters .................................................................... 25

6.11.1 Baud Rate .....................................................................................................26

6.11.2 Sample Period ...............................................................................................26

6.11.3 Duplex Mode .................................................................................................26

6.11.4 Linefeed ........................................................................................................27

6.12 Calibration Parameters ........................................................................... 27

6.12.1 R0 .................................................................................................................. 28

6.12.2 ALPHA ...........................................................................................................28

6.12.3 DELTA ............................................................................................................29

7 Digital Communication Interface ..........................................31

7.1 RS-232 Connection ................................................................................. 31

7.2 Interface Commands .............................................................................. 32

8 Test Probe Calibration ...........................................................35

8.1 Calibrating a Single Probe ...................................................................... 35

8.2 Dry-well Characteristics .......................................................................... 35

8.2.1 Stabilization and Accuracy ..........................................................................35

9 Calibration Procedure ............................................................37

9.1 Calibration Points .................................................................................... 37

9.2 Calibration Procedure ............................................................................. 37

9.2.1 Compute DELTA ............................................................................................37

9.2.2 Compute R0 and ALPHA ..............................................................................38

9.2.3 Accuracy and Repeatability ..........................................................................39

10 Maintenance ...........................................................................41

11 Troubleshooting .....................................................................43

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11.1 Troubleshooting Problems, Possible Causes, and Solutions .................. 43

11.2 CE Comments ......................................................................................... 44

11.2.1 EMC Directive ...............................................................................................44

11.2.2 Low Voltage Directive (Safety) ...................................................................... 44

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9102S Dry-Well Calibrator

iv

Tables

Table 1 International Electrical Sympols used on products ............................... 2

Table 2 Specifications ........................................................................................ 9

Table 3 Accessories ......................................................................................... 15

Table 4 Controller communications commands .............................................. 32

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v

Figures

Figure 1 12 V DC Power Source Polarity ........................................................ 12

Figure 2 Back Panel ......................................................................................... 13

Figure 3 Front Panel ......................................................................................... 14

Figure 4 Controller operation flowchart ........................................................... 20

Figure 5 Serial Cable Wiring ............................................................................ 31

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1

Before You Start

Introduction

Before You Start1

Introduction1.1

The Fluke Calibration 9102S Mid-Range Field Calibrator is a small portable instru­ment designed for quick on-site checks and calibration of thermocouple and RTD
temperature probes. This instrument is small enough to use in the eld, and accurate

enough to use in the lab. Calibrations may be done over a range of –10°C to 122°C
(14°F to 252°F). Temperature display and setpoint resolution are 0.1 degrees.

The instrument features:

A controlled temperature block with two calibration insert sleeves



Rapid heating and cooling



Prop stand



Handle strap



RS-232 interface capability



+12 Volt DC battery option



Built in programmable features include:

Temperature scan rate control



Eight set-point memory



Adjustable readout in °C or °F



The temperature is accurately controlled by Fluke’s digital controller. The control-

ler uses a precision platinum RTD as a sensor and controls the well temperature with

transistor driven thermoelectric devices.

The LED front panel shows the current well temperature. The temperature may be set,

using the control buttons, to any desired temperature within the instrument’s range.
Multiple fault protection devices insure user and instrument safety and protection.

This dry-well calibrator was designed for portability, low cost, and ease of operation.
Through proper use and maintenance, the instrument will provide continued accurate
calibration of temperature sensors and devices. The user should be familiar with the
safety guidelines and operating procedures of the calibrator as described in the instruc­tion manual.

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9102S Dry-Well Calibrator

Symbols

2

Symbols1.2

Table 1 lists the International Electrical Symbols. Some or all of these symbols may be
used on the instrument or in this manual.

Table 1 International Electrical Sympols used on products

Symbol Description

AC (Alternating Current)

AC-DC

Battery

Complies with European Union directives

DC

Double Insulated

Electric Shock

Fuse

PE Ground

Hot Surface (Burn Hazard)

Read the User’s Guide (Important Information)

Off

On

Canadian Standards Association

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3

Before You Start

Safety Information

Symbol Description

C-TICK Australian EMC mark

The European Waste Electrical and Electronic Equipment (WEEE) Directive (2002/96/
EC) mark.

Safety Information1.3

Use this instrument only as specied in this manual. Otherwise, the protection provid­ed by the instrument may be impaired. Refer to the safety information in the Warnings

and Cautions sections below.

The following denitions apply to the terms “Warning” and “Caution”.

“Warning” identies conditions and actions that may pose hazards to the user.



“Caution” identies conditions and actions that may damage the instrument



being used.

1.3.1 WARNINGS

To avoid personal injury, follow these guidelines.

GENERAL

DO NOT use this instrument in environments other than those listed in the

User’s Guide.

Inspect the instrument for damage before each use. DO NOT use the instrument

if it appears damaged or operates abnormally.

Follow all safety guidelines listed in the user’s manual.



Calibration Equipment should only be used by Trained Personnel.



If this equipment is used in a manner not specied by the manufacturer, the



protection provided by the equipment may be impaired.

Before initial use, or after transport, or after storage in humid or semi-humid



environments, or anytime the dry-well has not been energized for more than
10 days, the instrument needs to be energized for a “dry-out” period of 2 hours

before it can be assumed to meet all of the safety requirements of the IEC
1010-1. If the product is wet or has been in a wet environment, take necessary

measures to remove moisture prior to applying power such as storage in a low
humidity temperature chamber operating at 50 degree centigrade for 4 hours or
more.

DO NOT use this instrument for any application other than calibration work.

The instrument was designed for temperature calibration. Any other use of the

instrument may cause unknown hazards to the user.

Completely unattended operation is not recommended.

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9102S Dry-Well Calibrator

Safety Information

4

Overhead clearance is required. DO NOT place the instrument under a cabinet
or other structure. Always leave enough clearance to allow for safe and easy

insertion and removal of probes.

If the instrument is used in a manner not in accordance with the equipment



design, the operation of the dry-well may be impaired or safety hazards may
arise.

This instrument is intended for indoor use only.



BURN HAZARDS

DO NOT turn the instrument upside down with the inserts in place; the inserts

will fall out.

DO NOT operate near ammable materials.

Use of this instrument at HIGH TEMPERATURES for extended periods of
time requires caution.

DO NOT touch the well access surface of the instrument.

The block vent may be very hot due to the fan blowing across the heater block



of the dry-well.

The temperature of the well access is the same as the actual display



temperature, e.g. if the instrument is set to 375°C and the display reads 375°C,
the well is at 375°C.

For top loading dry-wells, the top sheet metal of the dry-well may exhibit



extreme temperatures for areas close to the well access.

The air over the well can reach temperatures greater that 200°C for high



temperature (400°C and higher) dry-wells. Note: Probes and inserts may
be hot and should only be inserted and removed from the instrument when

the instrument is set at temperatures less than 50°C. Use extreme care when

removing hot inserts.

DO NOT turn off the instrument at temperatures higher than 100°C. This could

create a hazardous situation. Select a set-point less than 100°C and allow the

instrument to cool before turning it off.

The high temperatures present in dry-wells designed for operation at 300°C



and higher may result in res and severe burns if safety precautions are not

observed.

A re may occur if a short circuit occurs along the input cord and no protective



devices are on the DC input source. For short circuit protection using a battery,
a fuse is required at the battery terminals.

ELECTRICAL SHOCK



DO NOT operate this instrument without a properly grounded, properly

polarized power cord. Electric shock may result.

DO NOT connect this instrument to a non-grounded, non-polarized outlet.

Ensure the earth ground to the outlet is properly connected. Electrical shock
may result if the outlet is not installed correctly.

Always replace the power cord with an approved cord of the correct rating and



type.

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Before You Start

Safety Information

HIGH VOLTAGE is used in the operation of this equipment. SEVERE
INJURY or DEATH may result if personnel fail to observe safety precautions.

Before working inside the equipment, turn power off and disconnect power
cord.

If supplied with user accessible fuses, always replace the fuse with one of the



same rating, voltage and type.

BATTERY PACK

To avoid the risk of electric shock or re, do not use the charger outdoors or in



a dusty, dirty, or wet environment.

If the cord, case, or plug of the charger is damaged in any way, discontinue its



use immediately and have it replaced. Never disassemble the charger.

The battery may contain chemicals that are hazardous. To avoid the risk of



exposure to dangerous substances or explosion, immediately discontinue use

of the battery if it leaks or becomes damaged. Never allow the battery to be

shorted, heated, punctured, dropped, or crushed.

Store the battery where it will not come into contact with metal or uids



that might short circuit the battery and where it will be safe from excessive
temperatures.

When no longer usable, the battery must be recycled. The battery may be



returned to the seller for recycling. Do not dispose of the battery in a landll.

Never dispose of the battery in re as there is danger of explosion which may



cause injury or property damage.

1.3.2 CAUTIONS

Always operate this instrument at room temperature between 41°F and 122°F



(5°C to 50°C). Allow sufcient air circulation by leaving at least 6 inches (15

cm) of clearance around the instrument.

Component lifetime can be shortened by continuous high temperature



operation.

DO NOT use uids to clean out the well.

Never introduce any foreign material into the probe hole of the insert. Fluids,

etc. can leak into the instrument causing damage.

DO NOT change the values of the calibration constants from the factory set

values. The correct setting of these parameters is important to the safety and
proper operation of the calibrator.

DO NOT drop the probe sheath in to the well. This type of action can cause a

shock to the sensor and affect the calibration.

The instrument and any thermometer probes used with it are sensitive



instruments that can be easily damaged. Always handle these devices with care.

DO NOT allow them to be dropped, struck, stressed, or overheated.

The Factory Reset Sequence (see Section , Troubleshooting) should be



performed only by authorized personnel if no other action is successful in

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9102S Dry-Well Calibrator

Authorized Service Centers

6

correcting a malfunction. You must have a copy of the most recent Report of

Calibration to restore the calibration parameters.

DO NOT operate this instrument in an excessively wet, oily, dusty, or dirty

environment. Always keep the well and inserts clean and clear of foreign

material.

The dry-well is a precision instrument. Although it has been designed for



optimum durability and trouble free operation, it must be handled with care.

Always carry the instrument in an upright position to prevent the probe sleeves

from falling out. The convenient handle strap allows for one hand carrying.

If a mains supply power uctuation occurs, immediately turn off the instrument.



Power bumps from brown-outs could damage the instrument. Wait until the
power has stabilized before re-energizing the instrument.

The prop stand was not designed to be used as a handle for carrying the



instrument. To avoid damage, do not force the prop stand beyond the incline
positions of the instrument.

Allow for probe expansion inside the well as the block heats.



Most probes have handle temperature limits. Be sure that the probe handle



temperature limit is not exceeded in the air above the instrument.

1.4 Authorized Service Centers

Please contact one of the following authorized Service Centers to coordinate service

on your Fluke product:

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Before You Start

Authorized Service Centers

When contacting these Service Centers for support, please have the following infor­mation available:

Model Number



Serial Number



Voltage



Complete description of the problem



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Specications and Environmental Conditions

Environmental Conditions

Specications and Environmental Conditions2

Specications2.1

SpecificationsTable 2

Range –10°C to 122°C (14°F to 252°F) at an ambient of 23°C

Accuracy ±0.25°C

Stability ±0.05°C

Resolution 0.1°C or °F

Well-to-Well
Uniformity

±0.2°C with sensors of similar size at equal depths within wells

Heating Times ambient to 100°C: 10 minutes

Stabilization 7 minutes

Cooling Times ambient to 0°C: 10 minutes

Well Depth 4 inches (102 mm)

Removable Inserts refer to Section , Accessories

Power 94–234 VAC (±10%), 50/60 Hz, 50 W; or 12 VDC

Size 4” H x 6” W x 6.9”D

(100 mm x 152 mm x 175 mm)

Weight 4 lb. (1.8 Kg)

Safety Conforms to EN61010-1

Conforms to CAN/CSA C22.2 No.1010.1
UL3111 and ANSI/ISA-S82.01

Fault Protection Sensor burnout protection, over-temperature cutout, and electrical fuses

Fuse Rating 250 V, 3 A FF (very fast acting) NO USER SERVICEABLE PARTS

Environmental Conditions2.2

Although the instrument has been designed for optimum durability and trouble-free

operation, it must be handled with care. The instrument should not be operated in an
excessively dusty or dirty environment. Maintenance and cleaning recommendations

can be found in the Maintenance Section of this manual.

The instrument operates safely under the following conditions:

temperature range: 5–50°C (41–122°F)



ambient relative humidity: 15–50%



pressure: 75kPa–106kPa



mains voltage within ±10% of nominal



vibrations in the calibration environment should be minimized



altitudes less than 2000 meters



indoor use only



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Quick Start

AC Power Operation

Quick Start3

Unpacking3.1

Unpack the dry-well carefully and inspect it for any damage that may have occurred
during shipment. If there is shipping damage, notify the carrier immediately.

Verify that the following components are present:

9102S Dry-well



Power Cord



User’s Guide with Report of Calibration



RS-232 Cable



9930 Interface-it Software



3102-3 Insert, 3/16”



3102-4 Insert, 1/4”



Insert Removal Tool



Set-up3.2

Place the calibrator on a at surface with at least 6 inches of free space around the
instrument. Always leave enough clearance in front of the instrument to allow for

safe and easy insertion and removal of probes. The prop stand may be swung down to
raise the front of the instrument from a horizontal position. Plug the power cord into a

grounded mains outlet. Observe that the nominal voltage corresponds to that indicated

on the calibrator.

Turn on the power to the calibrator by toggling the power switch on. The fan should
begin quietly blowing air through the instrument and the controller display should

illuminate after 3 seconds. After a brief self-test the controller should begin normal
operation. If the unit fails to operate, check the power connection.

The display should show the well temperature and the well heater will bring the tem­perature of the well to the set-point temperature.

After using the calibrator, allow the well to cool by setting the temperature to 25°C

and waiting 1/2 hour before turning the instrument off.

AC Power Operation3.3

Plug the dry-well power cord into a mains outlet of the proper voltage, frequency, and

current capability. Refer to Section 3.1, Specications, for the power details. Turn the

dry-well on using the switch on the rear panel. The dry-well will turn on and begin to

heat to the previously programmed temperature set-point. The front panel LED display

will indicate the actual dry-well temperature.

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9102S Dry-Well Calibrator

DC Power Operation

12

DC Power Operation3.4

This instrument is equipped with a DC power option. The DC option requires a power

source that delivers 12 VDC at 3 amps.

WARNING: A fire may occur if a short circuit occurs along the input cord and

no protective devices are on the DC input source. For short circuit protection
using a battery, a fuse is required at the battery terminals.

The DC power socket is located on the rear panel of the instrument near the AC power
jack. The instrument accepts a 7/32 inch diameter, two-conductor DC power plug
such as Switchcraft® PN. 760. Observe the correct polarity as shown in Figure . The
outside conductor is positive and the inside is negative. The AC power switch on the

rear panel does not switch the DC power.

+

–

Figure 1 12 V DC Power Source Polarity

The optional Model 9320A Battery Pack, available from Fluke, can be used as a por­table power source.

Setting the Temperature3.5

Section 6.2, Temperature Set-point, on page 19 explains in detail how to set the
temperature set-point on the calibrator using the front panel keys. The procedure is
summarized here.

Press “SET” twice to access the set-point value.1.
Press 2. u or d arrow to change the set-point value.

Press “SET” to program in the new set-point.3.

Press and hold “EXIT” to return to the temperature display.4.

When the set-point temperature is changed the controller switches the well heater
on or off to raise or lower the temperature. The displayed well temperature gradu­ally changes until it reaches the set-point temperature. The well may require 5 to

10 minutes to reach the set-point depending on the span. Another 5 to 10 minutes is
required to stabilize within ±0.1°C of the set-point. Ultimate stability may take 15 to

20 minutes more of stabilization time.

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Parts and Controls

Rear Panel

Parts and Controls4

The user should become familiar with the dry-well calibrator and its parts: (See Figure
2 on this page and Figure 3 on next page).

Rear Panel4.1

Power Cord - The removable power cord, (Figure ) attaches to the back side of the

instrument. It plugs into a standard 115 VAC (optional 230 VAC) grounded socket.

Figure 2 Back Panel

DC Power Jack - The calibrator can be used with a DC power source. The DC input

jack requires 12V and 3.3 amps. See Figure and the inset of Figure for pinout.

Power Switch - The power switch is located on the back panel of the instrument. The
switch is either on or off. The on position is for normal operation. The off position
disconnects power to the entire unit.

Fan - The instrument utilizes a variable speed fan. Under certain circumstances, the
fan may turn off. The fan shuts off at 100°C and above. Slots at the top and around the

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9102S Dry-Well Calibrator

Front Panel

14

corners of the instrument are provided for airow. The area around the calibrator must

be kept clear to allow for adequate ventilation. The air is directed from the front to the

back. Allow 6 inches of open space around the calibrator to allow adequate ventilation.

RS-232 - The RS-232 serial port provides a means for connecting the instrument to a

computer or a printer using the included serial cable.

WARNING: Always leave enough clearance in front of the calibrator to allow

for safe and easy installation and removal of probes.

Front Panel4.2

Figure 3 Front Panel

Strap - A strap is provided to aid the user in carrying the instrument in one hand. Slide
your hand into position and secure using the Velcro for a tight t. Be careful when

carrying the instrument while using the strap as inserts can fall out of the wells when

tipped forward. Inspect the strap periodically for wear.

Well Block - Located on the middle of the front panel are the well openings where

probes may be inserted into the well. The block is designed to accept temperature

sensors up to 1/2” (12.7 mm) in diameter. The wells can be made to accept probes
of smaller than 1/2” (12.7 mm) diameter by using optional inserts. Probes should t

snugly into the wells for best results.

Controller Display - The digital display is an important part of the temperature
controller because it not only displays set and actual temperatures but also indicates
various calibrator functions, settings, and constants. The display shows temperatures
in units according to the selected scale °C or °F.

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Parts and Controls

Accessories

Controller Keypad - The four button keypad allows easy setting of the set-point

temperature. The control buttons (SET, d, u, and EXIT) are used to set the calibrator
temperature set-point, access and set other operating parameters, and access and set
calibration parameters.

Setting the control temperature is done directly in degrees of the current scale. It can

be set to one-tenth of a degree Celsius or Fahrenheit.

The functions of the buttons are as follows:

SET – Used to display the next parameter in the menu and to store parameters to the

displayed value.

d (down arrow) – Used to decrement the displayed value of parameters.

u (up arrow) – Used to increment the displayed value.

EXIT – Used to exit a function and to skip to the next function. Any changes made to

the displayed value are ignored.

Accessories4.3

The table below lists optional inserts, carrying case, and battery packs by model
number.

AccessoriesTable 3

Model Description

3102-0 Blank Insert

3102-1 1/16 (1.6 mm) Insert

3102-2 1/8 (3.2 mm) Insert

3102-8 5/32 (4.0 mm) Insert

3102-3 3/16 (4.8 mm) Insert

3102-4 1/4 (6.4 mm) Insert

3102-5 5/16 (7.9 mm) Insert

3102-6 3/8 (9.5 mm) Insert

3102-7 7/16 (11.1 mm) Insert

9308 Rugged Carrying Case

9320A Battery Pack

Call your local Fluke representative for current pricing.

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17

General Operation

Changing Display Units

General Operation5

Setting the Temperature5.1

Section 6.2, Temperature Set-point, on page 19 explains in detail how to set the
temperature set-point on the calibrator using the front panel keys. The procedure is
summarized here.

Press “SET” twice to access the set-point value.1.
Press 2. u or d to change the set-point value.

Press “SET” to program in the new set-point.3.

Press and hold “EXIT” to return to the temperature display.4.

When the set-point temperature is changed the controller switches the well heater on
or off to raise or lower the temperature. The displayed well temperature gradually
changes until it reaches the set-point temperature. The well may require 5 to 10 min-

utes to reach the set-point depending on the span. Another 5 to 10 minutes is required
to stabilize within ±0.05°C of the set-point. Ultimate stability may take 15 to 20 min-

utes more of stabilization time.

Changing Display Units5.2

This instrument can display temperature in Celsius or Fahrenheit. The temperature
units are shipped from the factory set to Celsius. There are two ways to change to
Fahrenheit or back to Celsius.

1 - Press the “SET” and u simultaneously. The temperature display changes units.

or

1 - Press the “SET” key three times from the temperature display to show

Un= C

2 - Press the u or d key to change units.

3 - Press “SET” to save the setting or “EXIT” to continue without changing the

setting.

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19

Controller Operation

Temperature Set-point

Controller Operation6

This chapter discusses in detail how to operate the dry-well temperature controller

using the front control panel. Using the front panel key-switches and LED display the

user may monitor the well temperature, set the temperature set-point in degrees C or F,
monitor the heater output power, adjust the controller proportional band, and program

the calibration parameters, operating parameters, and serial interface conguration.
Operation of the functions and parameters are shown in the owchart in Figure 4 on

next page. This chart may be copied for reference.

In the following discussion a button with the word SET or EXIT inside, a u, or d,
indicates the panel button while the dotted box indicates the display reading. Explana­tions of the button or display reading are to the right of each button or display value.

Well Temperature6.1

The digital LED display on the front panel allows direct viewing of the actual well

temperature. This temperature value is normally shown on the display. The units, C or
F, of the temperature value are displayed at the right. For example,

100.0 C Well temperature in degrees Celsius

The temperature display function may be accessed from any other function by holding

and releasing the “EXIT” button.

6.2 Temperature Set-point

The temperature set-point can be set to any value within the range and with resolution

as given in the specications. Be careful not to exceed the safe upper temperature limit

of any device inserted into the well.

Setting the temperature involves selecting the set-point memory and adjusting the set-

point value.

Programmable Set-points6.2.1

The controller stores 8 set-point temperatures in memory. The set-points can be quick­ly recalled to conveniently set the calibrator to a previously programmed temperature
set-point.

To set the temperature, rst select the set-point memory. This function is accessed
from the temperature display function by pressing “SET”. The number of the set-point

memory currently being used is shown at the left on the display followed by the cur­rent set-point value.

100.0 C Well temperature in degrees Celsius

S

Access set-point memory

1 100. Set-point memory 1 location, 100°C currently used

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9102S Dry-Well Calibrator

Temperature Set-point

20

Figure 4

UP

UP

DOWN

DOWN

SET

Operating

Parameters

Menu

SET

SET

SET/EXIT

SET/EXIT

SET/EXIT

Cal

Menu

SET/EXIT

SET/EXIT

Serial

Interface

Menu

BAUD

Rate

Adjust

BAUD Rate

Sample

Period

Adj. Sample

Period

Duplex

Mode

Adj. Duplex

Mode

Linefeed

Adjust

Linefeed

Select ALPHA

Adjust ALPHA

Select DELTA

Adjust DELTA

EXIT

EXIT

EXIT

EXIT

DOWN

SET

SET

SET

+

+

+

Display Power

Set-Point Resistance

SET

SET/EXIT

SET

SET

Select Setpoint

Adjust Setpoint

Units °C/°F

Scan On/Off

Scan Rate

Display

Temperature

Configuration Menu

Secondary Functions

x5

HL

Adj. HL

SET/EXIT

Units °C/°F

Set Proportional Band

Select R0

Adjust R0

u

EXIT

DO NOT CHANGE THESE VALUES

SET/EXIT

SET/EXIT

SET

Cal

Menu

SET/EXIT

Select ALPHA

Adjust ALPHA

Select DELTA

Adjust DELTA

x5

Select R0

Adjust R0

DO NOT CHANGE THESE VALUES

SET/EXIT

SET/EXIT

Press “SET” to step through the menuand
to store the parameter value.

Press “EXIT” briefly to skipaparameter
without storing the parameter value.

Hold “EXIT” (2seconds) to exit the menu
and display the temperature

»

Menu Legend:

SET/EXIT

SET/EXIT

SET/EXIT

SET/EXIT

SET/EXIT

Controller operation flowchart

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21

Controller Operation

Temperature Set-point

To change to another set-point memory press the up or down arrow.

4 50. New set-point memory 4 location, 50°C

Press “SET” to accept the new selection and access the set-point value. Press “EXIT”

to continue and to ignore any changes.

S

Accept selected set-point memory

Set-point Value6.2.2

The set-point value may be adjusted after selecting the set-point memory and pressing

“SET”.

4 50. Set-point 4 value in°C

If the set-point value does not need to be changed, press and hold “EXIT” to resume
displaying the well temperature. To change the set-point value, press “SET” and then

press the up or down arrow.

60. New set-point value

When the desired set-point value is reached, press “SET” to accept the new value and
access the temperature scale units selection. If “EXIT” is pressed, any changes made

to the set-point are ignored.

S

Accept new set-point value

Temperature Scale Units6.2.3

The temperature scale units of the controller maybe set by the user to degrees Celsius
(°C) or Fahrenheit (°F). The units are used in displaying the well temperature, set­point, proportional band, and high limit.

Press “SET” after adjusting the set-point value to change display units.

Un= C Scale units currently selected

Press the up or down arrow to change the units.

Un= F New units selected

Press “SET” to accept the new units or “EXIT” to cancel.

Note: The temperature scale units may also be changed by pressing “SET” and u
when the temperature is displayed.

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9102S Dry-Well Calibrator

Scan

22

Scan6.3

The scan rate can be set and enabled so that when the set-point is changed the dry-well

heats or cools at a specied rate (degrees per minute) until it reaches the new set-point.

With the scan disabled the dry-well heats or cools at the maximum possible rate.

Scan Control6.3.1

The scan is controlled with the scan on/off function that appears in the main menu
after the temperature scale units.

Sc Scashesforonesecondandthenthecurrentscansetting

is displayed

Off Scanfunctionoff

Press the up or down arrow to toggle the scan on or off.

On Scanfunctionon

Press “SET” to accept the present setting and continue. Press “EXIT” to cancel.

S

Accept scan setting

Scan Rate6.3.2

The scan rate can be set from 0.1 to 99.9°C/min. The maximum scan rate, however,
is actually limited by the natural heating or cooling rate of the instrument. This rate is
often less than 100°C/min, especially when cooling.

The scan rate function appears in the main menu after the scan control function. The
scan rate units are in degrees Celsius per minute, regardless of the selected units.

Sr Srashesforonesecondandthenthecurrentscanrate

setting is displayed

0.1 Scan rate in°C/min

Press the up or down arrow to change the scan rate.

2.0 New scan rate

Press “SET” to accept the new scan rate and continue. Press “EXIT” to cancel.

S

Accept scan rate

Set-point Resistance6.4

The set-point resistance is the resistance the instrument is trying to make the control

sensor achieve and is calculated in the rmware using the set-point temperature. This

value is not directly adjustable but is recalculated when the set-point temperature is

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23

Controller Operation

Heater Power

changed. The set-point resistance is used to perform a calibration adjustment using

the Callendar-Van Dusen R versus T curve t (see Section , Calibration Procedure).

The instrument must be at temperature and stable prior to taking the set-point resis­tance reading. The set-point resistance can be displayed by pressing the “SET” and d
simultaneously. The set-point resistance is displayed as follows.

SrES SrESashesfortwosecondsandthenthewholenumber

ofthecurrentset-pointresistancesettingisdisplayed

99. Wholenumberportionoftheset-pointresistanceashes

fortwosecondsandthenthefractionportionofthecurrent

set-point resistance setting is displayed

.222 Fractionportionofthecurrentset-pointresistancesetting

The set-point resistance is 99.222.

Secondary Menu6.5

Functions which are used less often are accessed within the secondary menu. The

secondary menu is accessed by pressing “SET” and “EXIT” simultaneously and then
releasing. The rst function in the secondary menu is the heater power display. (See

Figure .)

Heater Power6.6

The temperature controller controls the temperature of the well by pulsing the heater
on and off. The total power being applied to the heater is determined by the duty
cycle or the ratio of heater on time to the pulse cycle time. By knowing the amount of
heating, the user can tell if the calibrator is heating up to the set-point, cooling down,
or controlling at a constant temperature. Monitoring the percent heater power, allows
the user to know the stability of the well temperature. With good control stability the

percent heating power should not uctuate more than ±5% within one minute.

The heater power display is accessed in the secondary menu. Press “SET” and “EXIT”

simultaneously and release. The heater power is displayed as a percentage of full
power.

100.0 C Well temperature

S+E

 Accessheaterpowerinsecondarymenu

SEC FlashesSECforsecondarymenuandthendisplaysthe

heaterpower

12.0P Heater power in percent

To exit out of the secondary menu press “EXIT”. To continue on to the proportional
band setting function press “SET”.

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9102S Dry-Well Calibrator

Proportional Band

24

Proportional Band6.7

In a proportional controller such as this, the heater output power is proportional to the

well temperature over a limited range of temperatures around the set-point. This range

of temperature is called the proportional band. At the bottom of the proportional band,
the heater output is 100%. At the top of the proportional band, the heater output is 0.

Thus, as the temperature rises the heater power is reduced, which consequently tends

to lower the temperature back down. In this way the temperature is maintained at a

constant level.

The temperature stability of the well and response time depend on the width of the

proportional band. If the band is too wide, the well temperature deviates excessively

from the set-point due to varying external conditions. This is because the power output
changes very little with temperature and the controller cannot respond very well to

changing conditions or noise in the system. If the proportional band is too narrow, the

temperature may swing back and forth because the controller overreacts to tempera­ture variations. For best control stability, the proportional band must be set for the
optimum width.

The proportional band width is set at the factory as printed on the Report of Calibra­tion. The proportional band width may be altered by the user if desired to optimize the
control characteristics for a particular application.

The proportional band width is easily adjusted from the front panel. The width may
be set to discrete values in degrees C or F depending on the selected units. The pro-

portional band adjustment is accessed within the secondary menu. Press “SET” and
“EXIT” to enter the secondary menu and show the heater power. Then press “SET” to

access the proportional band.

S+E

 Accessheaterpowerinsecondarymenu

SEC FlashesSECforsecondarymenuandthendisplaysthe

heaterpower

12.0P Heater power in percent

S

 Accessproportionalband

PrOP Flashespropandthendisplaysthesetting

4.1 Proportionalbandsetting

To change the proportional band press u or d.

10.0 Newproportionalbandsetting

To accept the new setting press “SET”. Press “EXIT” to continue without storing the

new value.

S

 Acceptthenewproportionalbandsetting

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25

Controller Operation

Serial Interface Parameters

Controller Conguration6.8

The controller has a number of conguration and operating options and calibration

parameters which are programmable via the front panel. These are accessed from the

secondary menu after the proportional band function by pressing “SET”. Pressing
“SET” again enters the rst of three sets of conguration parameters — operating

parameters, serial interface parameters, and calibration parameters. The menus are

selected using the up and down arrows and then pressing “SET”.

6.9 Operating Parameters

The operating parameters menu is indicated by,

PAr Operating parameters menu

The operating parameters menu contains the High Limit parameter.

High Limit6.10

The High Limit parameter adjusts the upper set-point temperature. The factory default
and maximum are set to 125°C (257°F). The minimum setting is 50°C (122°F). For
safety, a user can adjust the High Limit down so the maximum temperature set-point is

restricted.

HL FlashesHLandthendisplaysthesetting

125 Flashesthecurrentvalueandthendisplaysthevaluefor

adjustment

125 CurrentHighLimitsetting

Press the u or d to adjust the setting.

100 NewHighLimitsetting

To accept the new setting, press “SET”. Press “EXIT” to continue without storing the

new value.

S

 AcceptthenewHighLimitsetting

Serial Interface Parameters6.11

The serial RS-232 interface parameters menu is indicated by,

SErL SerialRS-232interfaceparametersmenu

Press “SET” to enter the menu. The serial interface parameters menu contains param­eters which determine the operation of the serial interface. The parameters in the menu

are — baud rate, sample period, duplex mode, and linefeed.

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9102S Dry-Well Calibrator

Serial Interface Parameters

26

Baud Rate6.11.1

The baud rate is the rst parameter in the menu. The baud rate setting determines the

serial communications transmission rate.

The baud rate parameter is indicated by,

bAUd FlashesbAUdforonesecondandthendisplaysthesetting

2400b Currentbaudrate

The BAUD rate of the serial communications may be programmed to 300, 600, 1200,
2400 (default), 4800, or 9600 BAUD. Use the up or down arrows to change the BAUD

rate value.

4800 b Newbaudrate

Press “SET” to accept the new setting or “EXIT” to abort the operation and skip to the

next parameter in the menu.

Sample Period6.11.2

The sample period is the next parameter in the serial interface parameter menu. The
sample period is the time period in seconds between temperature measurements trans-

mitted from the serial interface. If the sample rate is set to 5, the instrument transmits
the current measurement over the serial interface approximately every ve seconds.

The automatic sampling is disabled with a sample period of 0. The sample period is
indicated by,

SPEr Flashesforonesecondandthentheserialsampleperiod

setting is displayed

1 Current sample period (seconds)

Adjust the value by using the up or down arrows (u d).

60 New sample period

Press “SET” to accept the new setting or “EXIT” to abort the operation and skip to the

next parameter in the menu.

Duplex Mode6.11.3

The next parameter is the duplex mode. The duplex mode may be set to full duplex or
half duplex. With full duplex any commands received by the calibrator via the serial
interface are immediately echoed or transmitted back to the device of origin. With half
duplex the commands are executed but not echoed. The duplex mode parameter is
indicated by,

dUPL Flashesforonesecondandthentheserialduplexmode

setting is displayed

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27

Controller Operation

Calibration Parameters

FULL Currentduplexmodesetting

The mode may be changed using the up or down arrows (u d).

HALF Newduplexmodesetting

Press “SET” to accept the new setting or “EXIT” to abort the operation and skip to the

next parameter in the menu.

Linefeed6.11.4

The nal parameter in the serial interface menu is the linefeed mode. This parameter
enables (on) or disables (off) transmission of a linefeed character (LF, ASCII 10) after

transmission of any carriage-return. The linefeed parameter is indicated by,

LF Flashesforonesecondandthentheseriallinefeedsetting

is displayed

On Currentlinefeedsetting

The mode may be changed using the up or down arrows (u d).

OFF Newlinefeedsetting

Press “SET” to accept the new setting or “EXIT” to abort the operation and skip to the

next parameter in the menu.

6.12 Calibration Parameters

The operator of the instrument controller has access to a number of the calibration

constants: R0, ALPHA, and DELTA. These values are set at the factory and must

not be altered. The correct values are important to the accuracy and proper and safe

operation of the instrument. Access to these parameters is available to the user so that

in the event that the controller memory fails the user may restore these values to the
factory settings. The user should have a list of these constants and their settings with
the instrument manual.

CAUTION: DO NOT change the values of the instrument calibration constants
from the factory set values. The correct setting of these parameters is important
to the safety, proper operation, and performance of the instrument.

The calibration parameters menu is indicated by,

CAL Calibrationparametersmenu

Press “SET” ve times to enter the menu. The calibration parameters menu con­tains the parameters, Hard Cutout, R0, ALPHA, and DELTA, which characterize the

resistance-temperature relationship of the platinum control sensor. These parameters
may be adjusted to improve the accuracy of the calibrator.

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The calibration parameters are accessed by pressing “SET” after the name of the pa­rameter is displayed. The value of the parameter may be changed using the up or down

arrow. After the desired value is reached, press “SET” to set the parameter to the new
value. Pressing “EXIT” causes the parameter to be skipped ignoring any changes that

may have been made.

R06.12.1

This probe parameter refers to the resistance of the control probe at 0°C. The value of
this parameter is set at the factory for best instrument accuracy. The value ranges from
95 to 105. For values greater than 100.000, the display does not show the hundreds

placement. For values less than 100.000, the display shows the entire value. The R0

parameter is indicated by,

r0 FlashesforonesecondandthentheR0settingisdisplayed

00.014 Current R0 setting (100.014)

To change the R0 setting, press the up or down arrows.

99.999 New R0 setting

To accept the new setting, press “SET”. Press “EXIT” to continue without storing the

new value.

S

 AcceptthenewR0setting

ALPHA6.12.2

This probe parameter refers to the average sensitivity of the probe between 0 and
100°C. The value of this parameter is set at the factory for best instrument accuracy.

aLpha FlashesforonesecondandthentheALPHAsettingis

displayed

38530 CurrentALPHAsetting

To change the ALPHA setting, press the up or down arrows.

38600 NewALPHAsetting

To accept the new setting, press “SET”. Press “EXIT” to continue without storing the

new value.

S

 AcceptthenewALPHAsetting

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DELTA6.12.3

This probe parameter characterizes the curvature of the resistance-temperature rela­tionship of the sensor. The value of this parameter is set at the factory for best instru­ment accuracy.

DeLta FlashesforonesecondandthentheDELTAsettingis

displayed

0.0000 CurrentDELTAsetting

To change the DELTA setting, press the up or down arrows.

0.1000 NewDELTAsetting

To accept the new setting, press “SET”. Press “EXIT” to continue without storing the

new value.

S

 AcceptthenewDELTAsetting

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31

Digital Communication Interface

RS-232 Connection

Digital Communication Interface7

This instrument is capable of communicating with and being controlled by other
equipment through the digital serial interface.

With a digital interface, the instrument may be connected to a computer or other
equipment. This allows the user to set the set-point temperature, monitor the tempera­ture, and access any of the other controller functions, all using remote communications
equipment. Communications commands are summarized in Table 4 on next page.

RS-232 Connection7.1

The three-conductor jack for the serial port is located on the back of the instrument.

One serial cable is included. Additional or longer cables, of three meters or less, can

be constructed by following the wiring diagram shown in Figure 5 on this page. Note:

The TxD line on one side connects to the RxD line on the other and vice-versa. To

reduce the possibility of electrical interference, the serial cable should be shielded with
low resistance between the connector and the shield and should not be much longer
than is necessary. The protocol for serial communications is 8 data bits, 1 stop bit, and

no parity. Use no ow control. Set the linefeed to ON (all carriage returns are followed
by a linefeed (LF, ASCII 10)), and the duplex to HALF, disabling echo.

Figure 5

1

2

3

4

5

6

7

8

9

RxD

TxD

GND

RxD

TxD

GND

Serial Cable Wiring

The serial port can be used to transmit measurements to a computer or printer or to

change settings of the instrument from a computer. A full list of commands follows in
Section 7.2, Interface Commands, on page 32.

Commands sent to the instrument must end with an EOS character which is a carriage
return (CR, ASCII 13) or linefeed character (LF, ASCII 10). Commands can be sent

with upper or lower case letters. Data returned from the instrument end with a carriage

return. If the linefeed setting is on, a linefeed is also sent after the carriage return.

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9102S Dry-Well Calibrator

Interface Commands

32

7.2 Interface Commands

The various commands for accessing the calibrator functions via the digital interface
are listed in this section (see Table 4 on this page). These commands are used with the

RS-232 serial interface. The commands are terminated with a carriage-return character
(CR, ASCII 13). The interface makes no distinction between upper and lower case

letters, hence either may be used. Commands may be abbreviated to the minimum

number of letters which determines a unique command. A command may be used to

either set a parameter or display a parameter depending on whether or not a value is
sent with the command following a “=” character. For example “s” returns the current
set-point and “s=120.0” sets the set-point to 120.0 degrees.

In the following list of commands, characters or data within brackets, “[” and “]”, are
optional for the command. A slash, “/”, denotes alternate characters or data. Numeric

data, denoted by “n”, may be entered in decimal or exponential notation. Characters

are shown in lower case although upper case may be used. Spaces may be added
within command strings and will simply be ignored. Backspace (BS, ASCII 8) may be
used to erase the previous character. A terminating carriage return (CR, ASCII 13) is

implied with all commands.

Table 4 Controller communications commands

Command Description

Command
Format

Command
Example

Returned

Returned
Example

Acceptable
Values

Display Temperature

Read current set-point s[etpoint] s set: 999.99 {C

or F}

set: 75.00 C

Set current set-point to n s[etpoint]=n

t[emperature]=n

s=100
t=100

–10 to 122°C
14 to 252°F

Read temperature t[emperature] t t: 999.9 {C or F} t: 55.6 C

Read temperature units u[nits] u u: x u: C

Set temperature units: u[nits]=c/f C or F

Set temperature units to Celsius u[nits]=c u=c

Set temperature units to
Fahrenheit

u[nits]=f u=f

Read scan mode sc[an] sc sc: {ON or OFF} sc: ON

Set scan mode sc[an]=on/off sc=on ON or OFF

Read scan rate sr[ate] sr srat: 99.9 {C or

F}/min

srat:12.4 C/min

Set scan rate sr[ate]=n sr=1.1 0.1 to 99.9°C

0.2 to 179.8°F

Secondary Menu

Read proportional band setting pr[op-band] pr pb: 999.99999 pb: 15.9

Set proportional band to n pr[op-band]=n pr=8.83 0.1 to 30°C

0.2 to 54°F

Read heater power (duty cycle) po[wer] po po: 999.9 po: 6.5

Conguration Menu

Operating Parameters Menu

Read High Limit hl[imit] hl hl: 9999 hl: 125

Set High Limit hl[imit]=n hl=100 50 to 125°C

122 to 257°F

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33

Digital Communication Interface

Interface Commands

Command Description

Command
Format

Command
Example

Returned

Returned
Example

Acceptable
Values

Serial Interface Menu

Read serial sample setting sa[mple] sa sa: 99999 sa: 1

Set serial sampling setting to n seconds sa[mple]=n sa=0 0 to 10,000

Set serial duplex mode: du[plex]=f[ull]/

h[alf]

FULL or HALF

Set serial duplex mode to full du[plex]=f[ull] du=f

Set serial duplex mode to half du[plex]=h[alf] du=h

Set serial linefeed mode: lf[eed]=on/of[f] ON or OFF

Set serial linefeed mode to on lf[eed]=on lf=on

Set serial linefeed mode to off lf[eed]=of[f] lf=of

Calibration Menu

Read R0 calibration parameter r[0] r r0: 999.999 r0: 100.7

Set R0 calibration parameter to n r[0]=n r=100.7 95.0 to 105.0

Read ALPHA calibration parameter al[pha] al al: 9.99999999 al: 0.003865

Set ALPHA calibration parameter to n al[pha]=n al=0.003865 0.002 to 0.006

Read DELTA calibration parameter de[lta] de de: 1.50

Set DELTA calibration parameter de[lta]=n de=1.37 de: 9.99999 0.0–3.0

Miscellaneous Other Commands

Read rmware version number *ver[sion] *ver ver.9999x,9.99 ver.9102S,1.10

Read structure of all commands h[elp] h list of

commands

Read ALL operating parameters all all list of

parameters

Read set-point *sr *sr 999.999 ohms 100.123 ohms

Legend: [] Optional command data

{} Returns either information

n Numeric data supplied by user

9 Numeric data returned to user

x Character data returned to user

Note: When DUPLEX is set to FULL and a command is sent to READ, the command is returned

followed by a carriage return and linefeed. Then the value is returned as indicated in the
RETURNED column.

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35

Test Probe Calibration

Dry-well Characteristics

Test Probe Calibration8

For optimum accuracy and stability, allow the calibrator to warm up for 10 minutes
after power-up and then allow adequate stabilization time after reaching the set-point
temperature. After completing operation of the calibrator, allow the well to cool by set­ting the temperature to 25°C for one-half hour before switching the power off.

Calibrating a Single Probe8.1

Insert the probe to be calibrated into the well of the instrument. The probe should
t snugly into the calibrator probe sleeve yet should not be so tight that it cannot be
easily removed. Avoid any dirt or grit that may cause the probe to jam into the sleeve.
Best results are obtained with the probe inserted to the full depth of the well. Once the

probe is inserted into the well, allow adequate stabilization time to allow the test probe

temperature to settle as described above. Once the probe has settled to the temperature

of the well, it may be compared to the calibrator display temperature. The display
temperature should be stable to within ±0.05°C degree for best results.

CAUTION: Never allow foreign material into the wells of the block. Fluids and
other materials can damage the instrument causing binding and damage to your
probe.

Dry-well Characteristics8.2

There is a temperature gradient vertically in the test well. The heater has been applied
to the block in such a way as to compensate for nominal heat losses out of the top of
the dry-well. However, actual heat losses vary with design of the thermometer probes
inserted into the calibrator and the temperature. For best results, insert probe to full
depth of well.

Stabilization and Accuracy 8.2.1

The stabilization time of the instrument depends on the conditions and temperatures

involved. Typically, the test well stabilizes to ±0.05°C within 7 minutes of reaching
the set-point temperature as indicated by the display. Ultimate stability is achieved 10

to 20 minutes after reaching the set temperature.

Depending on the magnitude of the disturbance and the required accuracy, inserting
a cold probe into a warm well will require another stabilization period. For example,

inserting a 0.25 inch diameter room temperature probe into a sleeve at 120°C takes 7

minutes to be within ±0.05°C of its settled point and might take 15 minutes to achieve
maximum stability.

Speeding up the calibration process can be accomplished by knowing how soon to
make the measurement. It is recommended that typical measurements be made at the

desired temperatures with the desired test probes to establish these times.

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37

Calibration Procedure

Calibration Procedure

Calibration Procedure9

Note: This procedure is to be considered a general guideline. Each laboratory
should write their own procedure based on their equipment and their quality
program. Each procedure should be accompanied by an uncertainty analysis
also based on the laboratory’s equipment and environment.

Sometimes the user may want to calibrate the dry-well to improve the temperature

set-point accuracy. Calibration is done by adjusting the controller probe calibra­tion constants R0 , ALPHA, and DELTA so that the temperature of the dry-well as
measured with a standard thermometer agrees more closely with the set-point. The
thermometer used must be able to measure the well temperature with higher accuracy
than the desired accuracy of the dry-well. By using a good thermometer and following
this procedure the dry-well can be calibrated to an accuracy of better than 0.25°C over
its full range.

Calibration Points9.1

In calibrating the dry-well, R0, ALPHA, and DELTA are adjusted to minimize the
set-point error at each of three different dry-well temperatures. Any three reasonably
separated temperatures may be used for the calibration. Improved results can be ob-

tained for shorter ranges when using temperatures that are just within the most useful
operating range of the dry-well. The farther apart the calibration temperatures, the
greater the calibrated temperature range. However, the calibration error is also greater
over the range. For instance, if 10°C to 100°C is chosen as the calibration range, the
calibrator may achieve an accuracy of ±0.25°C over the range 10°C to 100°C. Choos­ing a range of 50°C to 100°C may allow the calibrator to have a better accuracy of
maybe ±0.2°C over the range 75°C to 105°C but outside that range the accuracy may
be only ±0.25°C.

Calibration Procedure9.2

Choose three set-points to use in the calibration of the R0, ALPHA, and DELTA 1.
parameters. These set points are generally 2°C, 50°C, and 100°C but other set
points may be used if desired or necessary.

Set the dry-well to the lowest set-point. When the dry-well reaches the set-point 2.
and the display is stable, wait 15 minutes or so and then take a reading from
the thermometer. Sample the set-point resistance by holding down “SET” and
pressing the d. Write these values down as T1 and R1 respectively.

Repeat step 2 for the other two set-points recording them as T3.

2

and R2 and T3

and R3 respectively.

Using the recorded data, calculate new values for the R0, ALPHA, and DELTA.4.

Compute DELTA9.2.1

AT T=−

32

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9102S Dry-Well Calibrator

Calibration Procedure

38

BT T=−

21

C

TT

TT

=











−











−











−











33

22

100

1

100 100

1

100

D

TTTT

=











−











−











−











2211

100

1

100 100

1

100

ERT=−

32

FRT=−

21

delta

AF BE

DE CF

=

−

−

T

1-3

- Measured temperature using thermometer.

R

1-3

- Value of set-point resistance from the instrument display. (Press “SET” and d at

the same time.)

where

T1 and R1 are the measured temperature and set-point resistance at 2.0 °C

T2 and R2 are the measured temperature and set-point resistance at 50.0 °C

T3 and R3 are the measured temperature and set-point resistance at 100.0 °C

Compute R0 and ALPHA9.2.2

aTdelta

TT

11

11

100

1

100

=+











−











aTdelta

TT

33

33

100

1

100

=+











−











rzero

Ra Ra

aa

=

−

−

31 13

13

alpha

RR

Ra Ra

=

−

−

13

31 13

delta is the new value of DELTA computed above

Program the new values for DELTA (delta), R0 (rzero), and ALPHA (alpha) into the

dry-well using the following steps.

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39

Calibration Procedure

Calibration Procedure

Press “SET” and “EXIT” at the same time. Press “SET” until 5. PAR is displayed.
and then press u until CAL is displayed.

Press “SET” five times to enter the menu.6.
Press “SET” and 7. u or d until the correct numerical setting is displayed. Press

“SET” to accept the new value.

Repeat step 3. for ALPHA and DELTA.8.

Press “EXIT” to show the displayed temperature.9.

Accuracy and Repeatability9.2.3

Check the accuracy of the dry-well at various points over the calibration range. If dry­well does not pass specication at all set-points, repeat the Calibration Procedure.

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41

Maintenance

Maintenance10

This instrument has been designed with the utmost care. Ease of operation



and simplicity of maintenance have been a central theme in the product
development. Therefore, with proper care the instrument should require very

little maintenance. Avoid operating the instrument in an oily, wet, dirty, or dusty

environment.

If the outside of the instrument becomes soiled, it may be wiped clean with



a damp cloth and mild detergent. Do not use harsh chemicals on the surface
which may damage the paint.

It is important to keep the well of the calibrator clean and clear of any foreign



matter. Do not use uid to clean out the well.

Use a commercially available plastic or felt brush, of appropriate diameter for



a tight t without any uid, to clean the well. Complete the cleaning process by

using cotton swabs and air to remove any debris.

Inserts should be cleaned periodically. For cold dry-wells operating below 0°C,



you should always clean the inserts after operating the unit at or below 0°C.

Use emery cloth or other similar material to clean the outside of the inserts.
Ensure that the inserts are wiped clean of any debris loosened in the bufng

process. Periodic cleaning of the outside of the inserts ensures easy insertion
and removal of the inserts from the well.

The dry-well calibrator should be handled with care. Avoid knocking or



dropping the calibrator.

Do not drop the probe stems into the well. This type of action can cause a shock



to the sensor.

If a hazardous material is spilt on or inside the equipment, the user is



responsible for taking the appropriate decontamination steps as outlined by the
national safety council with respect to the material.

If the mains supply cord becomes damaged, replace it with a cord with the



appropriate gauge wire for the current of the instrument. If there are any
questions, call an Authorized Service Center (see Section 1.4, Authorized
Service Centers, on page 6) for more information.

Before using any cleaning or decontamination method except those



recommended by Fluke, users should check with an Authorized Service Center

to be sure that the proposed method will not damage the equipment.

If the instrument is used in a manner not in accordance with the equipment



design, the operation of the dry-well may be impaired or safety hazards may
arise.

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43

Troubleshooting

Troubleshooting Problems, Possible Causes, and Solutions

Troubleshooting11

This section contains information on troubleshooting, CE Comments, and a wiring
diagram.

Troubleshooting Problems, Possible Causes, and Solutions11.1

In the event that the instrument appears to function abnormally, this section may help
to nd and solve the problem. Several possible problem conditions are described along
with likely causes and solutions. If a problem arises, please read this section carefully
and attempt to understand and solve the problem. If the problem cannot otherwise be
solved, contact an Authorized Service Center (see Section 1.4, Authorized Service
Centers, on page 6) for assistance. Be sure to have the model number, serial number,

voltage, and problem description available.

Problem Possible Causes and Solutions

Incorrect
temperature reading

Incorrect R0, ALPHA, and DELTA parameters. Find the value for R0, ALPHA,
and DELTA on the Report of Calibration. Reprogram the parameters into the
instrument (see Section , Calibration Parameters). Allow the instrument to
stabilize and verify the accuracy of the temperature reading.

Controller locked up. The controller may have locked up due to a power surge or
other aberration. Initialize the system by performing the Factory Reset Sequence.

Factory Reset Sequence. Hold the SET and EXIT buttons down at the same time
while powering up the instrument. The instrument displays shows ‘-init-‘, the
model number, and the rmware version. Each of the controller parameters and
calibration constants must be reprogrammed. The values can be found on the
Report of Calibration (see Section 6.12, Calibration Parameters, on page 27).

The instrument
heats or cools too
quickly or too slowly

Incorrect scan and scan rate settings. The scan and scan rate settings may be set
to unwanted values. Check the Scan and Scan Rate settings. The scan may be
off (if the unit seems to be responding too quickly). The scan may be on with the
Scan Rate set low (if unit seems to be responding too slowly).

Improper line voltage. Verify that the voltage reading in the bottom of the unit
matches the source voltage.

Unstable display Wait. Allow the instrument to stabilize for a few minutes.

Proportional band may be incorrect. Refer to the proportional band on the Report
of Calibration.

The display shows
an error code

Controller problem. The error messages signify the following problems with the
controller.

Err 1 - a RAM error
Err 2 - a NVRAM error
Err 3 - a Structure error
Err 4 - an ADC setup error
Err 5 - an ADC ready error
Err 6 – a defective control sensor
Err 7 – a heater error

Initialize the system by performing the Factory Reset Sequence describe above.

Temperature cannot
be set above a
certain point

Incorrect High Limit parameter. The High Limit parameter may be set below 125°C.
Check this value as described in Section 6.9, Operating Parameters, on page 25.

Display is reading
incorrectly

The instrument was turned off at high temperatures and reenergized too quickly.
Turn the instrument off until the display is completely off and then reenergize.

Display ickers
when the
instrument is turned
off

This is normal operation and is more prevalent at high temperatures due to
Seebeck Coefficient of the thermoelectric cooling devices. Some time is required
to fully discharge the switching power supply and to complete the power off cycle.

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9102S Dry-Well Calibrator

CE Comments

44

Problem Possible Causes and Solutions

The instrument
does not reach
temperature

The specications for the instrument include an ambient temperature of 23°C.
If the ambient temperature is above 23°C, the instrument may not be able to
reach the lowest specied temperature. Check the ambient temperature if the
instrument does not reach maximum temperature.

CE Comments11.2

EMC Directive11.2.1

Fluke’s equipment has been tested to meet the European Electromagnetic Compatibil-

ity Directive (EMC Directive, 89/336/EEC). The Declaration of Conformity for your
instrument lists the specic standards to which the unit was tested.

Low Voltage Directive (Safety)11.2.2

In order to comply with the European Low Voltage Directive (73/23/EEC), Fluke
equipment has been designed to meet the IEC 1010-1 (EN 61010-1) and the IEC
1010-2-010 (EN 61010-2-010) standards.

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725

Multifunction Process Calibrator

®

October, 1998 Rev.3, 5/04

© 1998-2004 Fluke Corporation, All rights reserved.
All product names are trademarks of their respective companies.

Users Manual

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LIMITED WARRANTY AND LIMITATION OF LIABILITY

Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is three years and
begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user
customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke’s opinion, has been misused, altered,
neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in
accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will
be error free or operate without interruption.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different
warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable
international price. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted
for repair in another country.

Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is
returned to a Fluke authorized service center within the warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service
center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty
repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect, misuse,
contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failures caused by use outside the product’s specified
rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work.
Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB
Shipping Point).

THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR
ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR
THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the
limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.

Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.

11/99

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Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands

Table of Contents

Title Page

Introduction....................................................................................................................1

Contacting Fluke............................................................................................................ 1

Standard Equipment...................................................................................................... 3

Safety Information.......................................................................................................... 3

Getting Acquainted with the Calibrator .......................................................................... 8

Input and Output Terminals ...................................................................................... 8

Keys.......................................................................................................................... 10

Display ...................................................................................................................... 13

Getting Started .............................................................................................................. 14

Shut Down Mode ........................................................................................................... 14

Contrast Adjustment ...................................................................................................... 16

Using Measure Mode..................................................................................................... 17

Measuring Electrical Parameters (Upper Display).................................................... 17

Current Measurement with Loop Power.................................................................... 17

Measuring Electrical Parameters (Lower Display).................................................... 19

Measuring Temperature............................................................................................ 20

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725

Users Manual

Using Thermocouples........................................................................................... 20

Using Resistance-Temperature Detectors (RTDs) ............................................... 23

Measuring Pressure .................................................................................................. 26

Zeroing with Absolute Pressure Modules.................................................................. 27

Using Source Mode........................................................................................................ 29

Sourcing 4 to 20 mA.................................................................................................. 29

Simulating a 4- to 20-mA Transmitter........................................................................ 29

Sourcing Other Electrical Parameters ....................................................................... 29

Simulating Thermocouples........................................................................................ 32

Simulating RTDs........................................................................................................ 32

Sourcing Pressure..................................................................................................... 35

Setting 0 % and 100 % Output Parameters ................................................................... 37

Stepping and Ramping the Output................................................................................. 37

Manually Stepping the mA Output............................................................................. 37

Auto Ramping the Output.......................................................................................... 38

Storing and Recalling Setups......................................................................................... 38

Calibrating a Transmitter................................................................................................ 39

Calibrating a Pressure Transmitter................................................................................. 41

Calibrating an I/P Device................................................................................................ 43

Testing an Output Device............................................................................................... 45

Remote Control Commands........................................................................................... 46

Replacing the Batteries.................................................................................................. 49

Replacing the Fuses ...................................................................................................... 49

Maintenance................................................................................................................... 50

Cleaning the Calibrator.............................................................................................. 50

Service Center Calibration or Repair......................................................................... 50

Replacement Parts.................................................................................................... 51

Accessories.................................................................................................................... 53

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Contents (continued)

External Fluke Pressure Module Compatibility ......................................................... 53

Specifications................................................................................................................. 56

DC Voltage Measurement......................................................................................... 56

DC Voltage Source ................................................................................................... 56

Millivolt Measurement and Source*........................................................................... 56

DC mA Measurement and Source ............................................................................ 57

Ohms Measurement.................................................................................................. 57

Ohms Source............................................................................................................ 57

Frequency Measurement.......................................................................................... 57

Frequency Source..................................................................................................... 58

Temperature, Thermocouples................................................................................... 58

Loop Power Supply................................................................................................... 59

RTD Excitation (simulation) ...................................................................................... 59

Temperature, RTD Ranges, and Accuracies (ITS-90).............................................. 59

Pressure Measurement............................................................................................. 60

General Specifications.............................................................................................. 60

iii

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Users Manual

iv

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List of Tables

Table Title Page

1. Summary of Source and Measure Functions........................................................................ 2

2. International Symbols ........................................................................................................... 7

3. Input/Output Terminals and Connectors............................................................................... 9

4. Key Functions ....................................................................................................................... 11

5. Thermocouple Types Accepted ............................................................................................ 21

6. RTD Types Accepted............................................................................................................24

7. mA Step Values .................................................................................................................... 38

8A. Remote Control Upper Display ............................................................................................. 46

8B. Remote Control Lower Display ............................................................................................. 46

8C. "S" Commands Select Sensor Type ..................................................................................... 48

9. Replacement Parts ............................................................................................................... 51

10. Fluke Pressure Module Compatibility ................................................................................... 53

11. Pressure Modules................................................................................................................. 54

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Users Manual

vi

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List of Figures

Figure Title Page

1. Standard Equipment ............................................................................................................. 6

2. Input/Output Terminals and Connectors............................................................................... 8

3. Keys...................................................................................................................................... 10

4. Elements of a Typical Display............................................................................................... 13

5. Voltage-to-Voltage Test ........................................................................................................ 15

6. Adjusting the Contrast .......................................................................................................... 16

7. Measuring Voltage and Current Output ................................................................................ 17

8. Connections for Supplying Loop Power................................................................................ 18

9. Measuring Electrical Parameters.......................................................................................... 19

10. Measuring Temperature with a Thermocouple ..................................................................... 22

11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance ................ 25

12. Gage and Differential Pressure Modules.............................................................................. 26

13. Connections for Measuring Pressure.................................................................................... 28

14. Connections for Simulating a 4- to 20-mA Transmitter ......................................................... 30

15. Electrical Sourcing Connections ........................................................................................... 31

16. Connections for Simulating a Thermocouple ........................................................................ 33

17. Connection for Simulating a 3-Wire RTD.............................................................................. 34

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Users Manual

18. Connections for Sourcing Pressure....................................................................................... 36

19. Calibrating a Thermocouple Transmitter............................................................................... 40

20. Calibrating a Pressure-to-Current (P/I) Transmitter............................................................... 42

21. Calibrating a Current-to-Pressure (I/P) Transmitter............................................................... 44

22. Calibrating a Chart Recorder.................................................................................................45

23. Replacing the Battteries........................................................................................................ 50

24. Replacement Parts................................................................................................................ 52

viii

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Multifunction Process Calibrator

Introduction

Your Fluke 725 Multifunction Process Calibrator (referred
to as “the calibrator”) is a handheld, battery-operated
instrument that measures and sources electrical and
physical parameters. See Table 1.

In addition to the functions in Table 1, the calibrator has
the following features and functions:

• A split-screen display. The upper display allows you

to measure volts, current, and pressure only. The
lower display allows you to measure and source
volts, current, pressure, resistance temperature
detectors, thermocouples, frequency, and ohms.

• Calibrates a transmitter using the split-screen.

• A thermocouple (TC) input/output terminal and

internal isothermal block with automatic reference­junction temperature compensation.

• Stores and recalls setups.

• Manual stepping and automatic stepping and

ramping.

• Controls the calibrator remotely from a PC running a

terminal emulator program.

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725

Users Manual

Table 1. Summary of Source and Measure Functions

Function Measure Source

dc V 0 V to 30 V 0 V to 10 V

dc mA 0 to 24 mA 0 to 24 mA

Frequency 1 CPM to 10 kHz 1 CPM to 10 kHz
Resistance 0 Ω to 3200 Ω 15 Ω to 3200 Ω

Thermocouple Types E, J, K, T, B, R, S, L, U, N, mV

RTD
(Resistance­Temperature
Detector)

Pressure 27 modules ranging from 10 in. H2O to

10,000 psi

Other functions Loop supply, Step, Ramp, Memory, Dual display

Pt100 Ω (385)
Pt100 Ω (3926)
Pt100 Ω (3916)
Pt200 Ω (385)

Pt500 Ω (385)
Pt1000 Ω (385)
Ni120

27 modules ranging from 10 in. H2O to
10,000 psi using an external pressure source
(hand pump)

2

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Standard Equipment

Standard Equipment

The items listed below and shown in Figure 1 are included
with your calibrator. If the calibrator is damaged or
something is missing, contact the place of purchase
immediately. To order replacement parts or spares, see
the user-replaceable parts list in Table 9.

• TL75 test leads (one set)

• AC70A alligator clips (one set)

• Stackable alligator clip test leads (one set)

• 725 Product Overview Manual

• 725 CD-ROM (contains Users Manual)

• Spare fuse

Safety Information

The calibrator is designed in accordance with IEC1010-1,
ANSI/ISA S82.01-1994 and CAN/CSA C22.2 No. 1010.1-

92. Use the calibrator only as specified in this manual,
otherwise the protection provided by the calibrator may be
impaired.

A Warning identifies conditions and actions that pose
hazard(s) to the user; a Caution identifies conditions and
actions that may damage the calibrator or the equipment
under test.

International symbols used on the calibrator and in this
manual are explained in Table 2.

3

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725

Users Manual

W Warning

To avoid possible electric shock or personal injury:

• Do not apply more than the rated voltage, as marked on the calibrator, between the terminals, or

between any terminal and earth ground (30 V 24 mA max all terminals).

• Before each use, verify the calibrator’s operation by measuring a known voltage.

• Follow all equipment safety procedures.

• Never touch the probe to a voltage source when the test leads are plugged into the current terminals.

• Do not use the calibrator if it is damaged. Before you use the calibrator, inspect the case. Look for

cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors.

• Select the proper function and range for your measurement.

• Make sure the battery door is closed and latched before you operate the calibrator.

• Remove test leads from the calibrator before you open the battery door.

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

damaged test leads before you use the calibrator.

• When using the probes, keep your fingers away from the probe contacts. Keep your fingers behind the

finger guards on the probes.

• Connect the common test lead before you connect the live test lead. When you disconnect test leads,

disconnect the live test lead first.

• Do not use the calibrator if it operates abnormally. Protection may be impaired. When in doubt, have the

calibrator serviced.

• Do not operate the calibrator around explosive gas, vapor, or dust.

4

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Safety Information

W Warning

• When using a pressure module, make sure the process pressure line is shut off and depressurized

before you connect it or disconnect it from the pressure module.

• Use only 4 AA batteries, properly installed in the calibrator case, to power the calibrator.

• Disconnect test leads before changing to another measure or source function.

• When servicing the calibrator, use only specified replacement parts.

• To avoid false readings, which could lead to possible electric shock or personal injury, replace the

battery as soon as the battery indicator (M) appears.

Caution

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

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

• Use the proper jacks, function, and range for your measurement or sourcing application.

5

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725

Users Manual

AC72

Alligator Clips

Test Lead Set

TL75

mA

4W

Stackable
Test Leads

Figure 1. Standard Equipment

3W

mA

-

SOURCE / M

+

STORE
SETUP

RECALL

30V MAX ALL TERMINALS

EASURE

V

Hz
RTD

COM

100%

25%

25%

0%

MEASURE

V

TC

mA

LOOP

COM

sh01f.eps

6

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Safety Information

Table 2. International Symbols

AC - Alternating current Double insulated

DC - Direct current Battery

Earth ground Refer to the manual for information about

this feature.

Pressure

Conforms to Canadian Standards
Association directives

O

ON/OFF

Conforms to European Union directives

7

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725

Users Manual

Getting Acquainted with the Calibrator

Input and Output Terminals

Figure 2 shows the calibrator input and output terminals.
Table 3 explains their use.

1

725

MULTIFUNCTION CALIBRATOR

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

2

8

7

6

5

3

4

sh05f.eps

Figure 2. Input/Output Terminals and Connectors

8

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Table 3. Input/Output Terminals and Connectors

No Name Description

Getting Acquainted with the Calibrator

A

B, C

D

E, F

G, H

Pressure module
connector

MEASURE V, mA
terminals

TC input/output Terminal for measuring or simulating thermocouples. This terminal accepts a miniature

SOURCE/ MEASURE
V, RTD, Hz, Ω
terminals

SOURCE/ MEASURE
mA terminals, 3W, 4W

Connects the calibrator to a pressure module or the calibrator to a PC for a remote
control connection.

Input terminals for measuring voltage, current, and supplying loop power.

polarized thermocouple plug with flat, in-line blades spaced 7.9 mm (0.312 in) center to
center.

Terminals for sourcing or measuring voltage, resistance, frequency, and RTDs.

Terminals for sourcing and measuring current, and performing 3W and 4W RTD
measurements.

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725

Users Manual

Keys

Figure 3 shows the calibrator keys and Table 4 explains
their use.

725

MULTIFUNCTION CALIBRATOR

3

725

MULTIFUNCTION CALIBRATOR

10

2

4

20

19

18

V mA

TC RTD

30V MAX ALL TERMINALS

V

TC

Hz
RTD

COM COM

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

MEASURE

V

mA

LOOP

V mA

TC RTD

V
Hz

RTD

COM COM

ZERO

16

14

17

15

13

12

Hz

C ˚F

˚

100%

25%

25%

0%

MEASURE

V

TC

mA

LOOP

5

V mA

LOOP

MEAS

1

SOURCE

STORE
SETUP

RECALL

SOURCE / MEASURE

+

mA
3W

-

mA
4W

30V MAX ALL TERMINALS

MEAS

SOURCE

STORE

SETUP

RECALL

SOURCE / MEASURE

+

mA
3W

-

mA
4W

V mA

LOOP

6

7

8

9

10

11

sh41f.eps

Figure 3. Keys

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Getting Acquainted with the Calibrator

Table 4. Key Functions

No Name Description

A O Turns the power on or off.
B l Selects voltage, mA or Loop Power measurement function in the upper display.
C A Selects the pressure measurement function in the upper display. Repeated pushes cycle

through the different pressure units.

D K Zeros the pressure module reading. This applies to both upper and lower displays.
E C Turns backlight on or off. Turns Contrast Adjust mode on when powering up.
F F Toggles frequency and ohms measurement and sourcing functions.
G D Toggles between Centigrade or Fahrenheit when in TC or RTD functions.
H G Recalls from memory a source value corresponding to 100 % of span and sets it as the

source value. Press and hold to store the source value as the 100 % value.

I H Increments output by 25 % of span.
J I Decrements output by 25 % of span.
K J Recalls from memory a source value corresponding to 0 % of span and sets it as the

source value. Press and hold to store the source value as the 0 % value.
Identifies Firmware version. Press and hold J when powering up.

11

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725

Users Manual

Table 4. Key Functions (cont.)

No Name Description

L L

AM
AMOYOZ
M XW

Y Z

N Q
O S

P

M

Q T

R V

S R

T U

12

Cycles through :

E

Slow repeating 0 % - 100 % - 0 % ramp

P

Fast repeating 0 % - 100 % - 0 % ramp

N

Repeating 0 % - 100 % - 0 % ramp in 25 % steps

Disables Shut Down Mode

Enables Shut Down Mode

Increases or decreases the source level.
Cycles through the 2-, 3-, and 4-wire selections.
Moves through the memory locations of calibrator setups.
In Contrast Adjustment mode; up-darkens contrast, down-lightens contrast.

Retrieves a previous calibrator setup from a memory location.

Saves the calibrator setup. Saves Contrast Adjust setup.

Cycles the calibrator through MEASURE and SOURCE modes in the lower display.

Selects TC (thermocouple) measurement and sourcing function in the lower display. Repeated pushes cycle through
the thermocouple types.

Toggles between voltage, mA sourcing, or mA simulate functions in the lower display.

Selects RTD (resistance temperature detector) measurement and sourcing function in lower display. Repeated pushes
cycle through the RTD types.

Selects the pressure measurement and sourcing function. Repeated pushes cycle through the different pressure units.

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Display

Figure 4 shows the elements of a typical display.

Getting Acquainted with the Calibrator

Low Battery

Symbol

Mode

Indicator

Loop

Annunciator

Figure 4. Elements of a Typical Display

Memory Locations

for Calibrator Setups

Units
Display

Auto
Ramp

sh07f.eps

13

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725

Users Manual

Getting Started

This section acquaints you with some basic operations of
the calibrator.

Proceed as follows to perform a voltage-to-voltage test:

1. Connect the calibrator’s voltage output to its voltage
input as shown in Figure 5.

2. Press O to turn on the calibrator. Press l to
select dc voltage (upper display).

3. If necessary, press M for SOURCE mode (lower
display). The calibrator is still measuring dc voltage,
and you can see the active measurements in the
upper display.

4. Press

5. Press

V to select dc voltage sourcing.

Y and Z to select a digit to change. Press X

to select 1 V for the output value. Press and hold

J to enter 1 V as the 0 % value.

6. Press

7. Press H and I to step between 0 and 100 %

X to increase the output to 5 V. Press and

G to enter 5 V as the 100 % value.

hold

in 25 % step increments.

Shut Down Mode

The calibrator comes with the Shut Down mode
enabled for a time duration set to 30 minutes
(displayed for about 1 second when the calibrator is
initially turned on). When the Shut Down mode is
enabled, the calibrator will automatically shut down
after the time duration has elapsed from the time the
last key was pressed. To disable the Shut Down
mode, press O and Y simultaneously. To enable the
mode, press O and Z simultaneously. To adjust the
time duration, press O and Z simultaneously, then
press X and/or W to adjust the time between 1 and
30 minutes.

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RECALL

STORE
SETUP

MEAS

SOURCE

V mA

LOOP

V mA

TC

725

MULTIFUNCTION CALIBRATOR

ZERO

Hz

RTD

C

˚

100%

25%

25%

0%

Shut Down Mode

F

˚

Figure 5. Voltage-to-Voltage Test

sh39f.eps

15

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725

Users Manual

Contrast Adjustment

Note

Available with V2.1 Firmware or greater. To
identify firmware version, press and hold J
when powering up. The firmware version will be
shown in the upper units display for about 1
second after initialization.

725

MULTIFUNCTION CALIBRATOR

1

To adjust the contrast, proceed as follows:

1. Press C and O until Contst Adjust is displayed as
shown in Figure 6.

2. Press and hold X to darken contrast.

3. Press and hold W to lighten contrast.

4. Press S to save the contrast level.

16

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

V mA

LOOP

MEAS

SOURCE

STORE

SETUP

RECALL

4

Figure 6. Adjusting the Contrast

2

3

sh06f.eps

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Using Measure Mode

Measuring Electrical Parameters (Upper Display)

To measure the current or voltage output of a transmitter,
or to measure the output of a pressure instrument, use the
upper display and proceed as follows:

725

MULTIFUNCTION CALIBRATOR

Using Measure Mode

1. Press

l to select volts or current. LOOP should

not be on.

2. Connect the leads as shown in Figure 7.

Current Measurement with Loop Power

The loop power function activates a 24 V supply in series
with the current measuring circuit, allowing you to test a
transmitter when it is disconnected from plant wiring. To
measure current with loop power, proceed as follows:

1. Connect the calibrator to the transmitter current loop
terminals as shown in Figure 8.

2. Press

l while the calibrator is in current

measurement mode. LOOP appears and an internal
24 V loop supply turns on.

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

Red

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

Black

Figure 7. Measuring Voltage and Current Output

sh42f.eps

17

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725

Users Manual

725

MULTIFUNCTION CALIBRATOR

Red

18

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

TEST DC PWR

+–+–

–+

Black

Figure 8. Connections for Supplying Loop Power

sh18f.eps

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Measuring Electrical Parameters (Lower Display)

To measure the electrical parameters using the lower
display, proceed as follows:

1. Connect the calibrator as shown in Figure 9.

Using Measure Mode

725

MULTIFUNCTION CALIBRATOR

2. If necessary, press
display)

3. Press

V for dc voltage or current, or F for

frequency or resistance.

M for MEASURE mode (lower

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

Figure 9. Measuring Electrical Parameters

sh43f.eps

19

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725

Users Manual

Measuring Temperature

Using Thermocouples

The calibrator supports ten standard thermocouples,
including type E, N, J, K, T, B, R, S, L, or U. Table 5
summarizes the ranges and characteristics of the
supported thermocouples.

To measure temperature using a thermocouple, proceed
as follows:

1. Attach the thermocouple leads to the appropriate TC
miniplug, then to the TC input/output as shown in
Figure 10. One pin is wider than the other. Do not try
to force a miniplug in the wrong polarization.

Note

If the calibrator and the thermocouple plug are at

different temperatures, wait one minute or more
for the connector temperature to stabilize after
you plug the miniplug into the TC input/output.

2. If necessary, press

3. Press T for the TC display. If desired, continue
pressing this key to select the desired thermocouple
type.

If necessary, you can toggle between °C or °F
temperature units by pressing

M for MEASURE mode.

D.

20

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Using Measure Mode

Table 5. Thermocouple Types Accepted

Positive Lead (H)

Type Positive Lead

Material

E Chromel Purple Violet Constantan -200 to 950

N Ni-Cr-Si Orange Pink Ni-Si-Mg -200 to 1300

J Iron White Black Constantan -200 to 1200

K Chromel Yellow Green Alumel -200 to 1370

T Copper Blue Brown Constantan -200 to 400

B Platinum (30 % Rhodium) Gray Platinum (6 % Rhodium) 600 to 1800

R Platinum (13 % Rhodium) Black Orange Platinum -20 to 1750

S Platinum (10 % Rhodium) Black Orange Platinum -20 to 1750

L Iron Constantan -200 to 900

U Copper Constantan -200 to 400
*American National Standards Institute (ANSI) device negative lead (L) is always red.
**International Electrotechnical Commission (IEC) device negative lead (L) is always white.

Color Negative Lead Specified Range

ANSI* IEC**

Material (°C)

21

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725

Users Manual

3W

SOURCE / MEASURE

+

mA

-

mA

4W

30V MAX ALL TERMINALS

V

TC

TC

mA

LOOP

Hz
RTD

COM COM

MEASURE

V

Process Temperature

Warning

22

TC Miniplug

30 V maximum to

sh12f.eps

Figure 10. Measuring Temperature with a Thermocouple

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Using Measure Mode

Using Resistance-Temperature Detectors (RTDs)

The calibrator accepts RTD types shown in Table 6. RTDs
are characterized by their resistance at 0 °C (32 °F),
which is called the “ice point” or R
is 100 Ω. The calibrator accepts RTD measurement inputs
in two-, three-, or four-wire connections, with the
three-wire connection the most common. A four-wire
configuration provides the highest measurement
precision, and two-wire provides the lowest measurement
precision.

. The most common R

0

To measure temperature using an RTD input, proceed as
follows:

1. If necessary, press

0

2. Press

3. Press

4. Attach the RTD to input terminals as shown in

5. If necessary, you can toggle between °C or °F

R for the RTD display. If desired, continue

pressing this key to select the desired RTD type.

X or W to select a 2-, 3-, or 4- wire

connection.

Figure 11.

temperature units by pressing

M for MEASURE mode.

D.

23

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725

Users Manual

Table 6. RTD Types Accepted

RTD Type Ice Point (R

Pt100 (3926) 100 Ω Platinum 0.003926 Ω/°C -200 to 630
Pt100 (385) 100 Ω Platinum 0.00385 Ω/°C -200 to 800
Ni120 (672) 120 Ω Nickel 0.00672 Ω/°C -80 to 260
Pt200 (385) 200 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt500 (385) 500 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt1000 (385) 1000 Ω Platinum 0.00385 Ω/°C -200 to 630
Pt100 (3916) 100 Ω Platinum 0.003916 Ω/°C -200 to 630

The Pt100 commonly used in U.S. industrial applications is Pt100 (3916), α = 0.003916 Ω/°C. (Also designated as JIS
curve.) The IEC standard RTD is the Pt100 (385), α = 0.00385 Ω/°C.

) Material α Range (°C)

0

24

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2W

3W

4W

SOURCE / MEASURE

+

mA

3W

-

mA
4W

SOURCE / MEASURE

+

mA

3W

-

mA
4W

SOURCE / MEASURE

+

mA

3W

-

mA
4W

30V MAX ALL TERMINALS

V

TC

Hz
RTD

COM COM

30V MAX ALL TERMINALS

V

TC

Hz
RTD

COM COM

30V MAX ALL TERMINALS

V

TC

Hz
RTD

COM COM

LOOP

LOOP

LOOP

mA

mA

mA

MEASURE

V

MEASURE

V

MEASURE

V

Using Measure Mode

RTD

RTD

RTD

Resistance
to be
measured

Figure 11. Measuring Temperature with an RTD, Measuring 2-, 3-, and 4-Wire Resistance

sh15f.eps

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725

Users Manual

Measuring Pressure

Many ranges and types of pressure modules are available
from Fluke. See “Accessories” near the back of this
manual. Before you use a pressure module, read its
instruction sheet. The modules vary in use, media, and
accuracy.

Figure 12 shows the gage and differential modules.
Differential modules also work in gage mode by leaving
the low fitting open to atmosphere.

To measure pressure, attach the appropriate pressure
module for the process pressure to be tested

Proceed as follows to measure pressure:

Gage

700P06

PRESSURE MODULE

RANGE

100 PSIG

BURST PRESSURE 300 PSIG

7 bar700 kPa

Differential

700P04

PRESSURE MODULE

RANGE

15 PSID/G

1 bar100 kPa

BURST PRESSURE 45 PSIG

HighLow

gj11f.eps

Figure 12. Gage and Differential Pressure Modules

W Warning

To avoid a violent release of pressure in a
pressurized system, shut off the valve and
slowly bleed off the pressure before you
attach the pressure module to the pressure
line.

26

Caution

To avoid mechanically damaging the
pressure module, never apply more than
10 ft.-lb. (13.5 Nm) of torque between the
pressure module fittings, or between the
fittings and the body of the module. Always
apply appropriate torque between the
pressure module fitting and connecting
fittings or adapters.

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Using Measure Mode

To avoid damaging the pressure module from
overpressure, never apply pressure above the
rated maximum printed on the pressure
module.

To avoid damaging the pressure module from
corrosion, use it only with specified
materials. Refer to the printing on the
pressure module or the pressure module
instruction sheet for the acceptable material
compatibility.

1. Connect a pressure module to the calibrator as
shown in Figure 13. The threads on the pressure
modules accept standard ¼ NPT pipe fittings. Use the
supplied ¼ NPT to ¼ ISO adapter if necessary.

2. Press

A. The calibrator automatically senses

which pressure module is attached and sets its range
accordingly.

3. Zero the pressure module as described in the
module’s Instruction Sheet. Modules vary in zeroing
procedures depending on module type, but all require
pressing

If desired, continue pressing
display units to psi, mmHg, inHg, cmH

K.

A to change pressure

O@4 °C,

2

O@20 °C, inH2O@4 °C, inH2O@20 °C, mbar,

cmH

2

2

bar, kg/cm

, or kPa.

Zeroing with Absolute Pressure Modules

To zero, adjust the calibrator to read a known pressure.
This can be barometric pressure, if it is accurately known,
for all but the 700PA3 module. The maximum range of
700PA3 is 5 psi; therefore the reference pressure must be
applied with a vacuum pump. An accurate pressure
standard can also apply a pressure within range for any
absolute pressure module. To adjust the calibrator
reading, proceed as follows:

1. Press K, REF Adjust will appear to the right of the
pressure reading.

2. Use X to increase or W to decrease the calibrator
reading to equal the reference pressure.

3. Press Kagain to exit zeroing procedure.

The calibrator stores and automatically reuses the zero
offset correction for one absolute pressure module so that
the module is not rezeroed every time you use it.

27

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Users Manual

725

MULTIFUNCTION CALIBRATOR

Isolation

Valve

Gage

Module

28

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

Differential

Module

HL

Tank

sh37f.eps

Figure 13. Connections for Measuring Pressure

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Using Source Mode

Using Source Mode

In SOURCE mode, the calibrator generates calibrated
signals for testing and calibrating process instruments;
supplies voltages, currents, frequencies, and resistances;
simulates the electrical output of RTD and thermocouple
temperature sensors; and measures gas pressure from
an external source, creating a calibrated pressure source.

Sourcing 4 to 20 mA

To select the current sourcing mode, proceed as follows:

1. Connect the test leads in the mA terminals (left
column).

2. If necessary, press

3. Press

V for current and enter the desired current

you want by pressing

Simulating a 4- to 20-mA Transmitter

Simulate is a special mode of operation in which the
calibrator is connected into a loop in place of a
transmitter and supplies a known, settable test current.
Proceed as follows:

1. Connect the 24 V loop power source as shown in
Figure 14.

M for SOURCE mode.

X and W keys.

2. If necessary, press

3. Press

4. Enter the desired current by pressing

V until both mA and SIM display.

keys.

M for SOURCE mode.

X and W

Sourcing Other Electrical Parameters

Volts, ohms, and frequency are also sourced and shown
in the lower display.

To select an electrical sourcing function, proceed as
follows:

1. Connect the test leads as shown in Figure 15,
depending on the source function.

2. If necessary, press

3. Press

4. Enter the desired output value by pressing

V for dc voltage, or F for frequency or

resistance.

Mfor SOURCE mode.

X and

W keys. Press Y and Z to select a different digit to

change.

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Users Manual

725

MULTIFUNCTION CALIBRATOR

30

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

V mA

LOOP

MEAS

Red

+

+24 V

SOURCE

STORE

SETUP

RECALL

Loop

Power

Supply

–

Figure 14. Connections for Simulating a 4- to 20-mA Transmitter

Black

Readout or

Controller

sh17f.eps

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Using Source Mode

mA

30V MAX ALL TERMINALS

SOURCE / MEASURE

+ mA

+

mA

Red

+

3W

-

mA
4W

–

V
Hz

RTD

COM COM

MEASURE

V

TC

mA

LOOP

Black

V

+

Hz

Red

SOURCE / MEASURE

+

mA

3W

-

mA
4W

–

Black

Common

30V MAX ALL TERMINALS

V

TC

mA

Hz

LOOP

RTD

COM COM

Common

MEASURE

V

sh16f.eps

Figure 15. Electrical Sourcing Connections

31

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725

Users Manual

Simulating Thermocouples

Connect the calibrator TC input/output to the instrument
under test with thermocouple wire and the appropriate
thermocouple mini-connector (polarized thermocouple
plug with flat, in-line blades spaced 7.9 mm [0.312 in]
center to center). One pin is wider than the other. Do not
try to force a miniplug in the wrong polarization. Figure 16
shows this connection. Proceed as follows to simulate a
thermocouple:

1. Attach the thermocouple leads to the appropriate TC
miniplug, then to the TC input/output as shown in
Figure 16.

2. If necessary, press

3. Press

4. Enter the temperature you want by pressing

T for the TC display. If desired, continue

pressing this key to select the desired thermocouple
type.

M for SOURCE mode.

X and

W keys. Press Y and Z to select a different digit to

edit.

Simulating RTDs

Connect the calibrator to the instrument under test as
shown in Figure 17. Proceed as follows to simulate an
RTD:

1. If necessary, press

2. Press

R for the RTD display.

M for SOURCE mode.

Note

Use the 3W and 4W terminals for measurement

only, not for simulation. The calibrator simulates
a 2-wire RTD at its front panel. To connect to a 3­wire or 4-wire transmitter, use the stacking
cables to provide the extra wires. See Figure 17.

3. Enter the temperature you want by pressing

W keys. Press Y and Z to select a different digit to

edit.

4. If the 725 display indicates ExI HI, the excitation
current from your device under test exceeds the limits
of the 725.

X and

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MULTIFUNCTION CALIBRATOR

Color depends

on type of TC

TEST DC PWR

++–

Using Source Mode

MEAS

SOURCE

STORE
SETUP

RECALL

V mA

LOOP

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

TC

–+

TC Miniplug

Figure 16. Connections for Simulating a Thermocouple

sh20f.eps

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725

Users Manual

SETUP

RECALL

STORE

MEAS

SOURCE

V mA

LOOP

V mA

TC

725

MULTIFUNCTION CALIBRATOR

ZERO

Hz

RTD

C

˚

100%

25%

25%

0%

SENSOR TERMINALS

1

4

3

2

F

˚

BLACK

RED

BLACK

Figure 17. Connections for Simulating 3-Wire RTD

sh40f.eps

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Using Source Mode

Sourcing Pressure

The calibrator sources pressure by measuring pressure
supplied by a pump or other sources, and displaying the
pressure in the SOURCE field. Figure 20 shows how to
connect a pump to a Fluke pressure module which makes
it a calibrated source.

Many ranges and types of pressure modules are available
from Fluke. See “Accessories” near the back of this
manual. Before you use a pressure module, read its
Instruction Sheet. The modules vary in use, media, and
accuracy.

Attach the appropriate pressure module for the process
pressure to be tested.

Proceed as follows to source pressure:

WWarning

To avoid a violent release of pressure in a
pressurized system, shut off the valve and
slowly bleed off the pressure before you
attach the pressure module to the pressure
line.

Caution

To avoid mechanically damaging the
pressure module, never apply more than
10 ft.-lb. (13.5 Nm) of torque between the
pressure module fittings, or between the
fittings and the body of the module. Always
apply appropriate torque between the
pressure module fitting and connecting
fittings or adapters.

To avoid damaging the pressure module from
overpressure, never apply pressure above the
rated maximum printed on the pressure
module.

To avoid damaging the pressure module from
corrosion, use it only with specified
materials. Refer to the printing on the
pressure module or the pressure module
instruction sheet for the acceptable material
compatibility.

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Users Manual

1. Connect a pressure module to the calibrator as
shown in Figure 18. The threads on the pressure
modules accept standard ¼ NPT pipe fittings. Use the
supplied ¼ NPT to ¼ ISO adapter if necessary.

2. Press

U (lower display). The calibrator

automatically senses which pressure module is
attached and sets its range accordingly.

3. Zero the pressure module as described in the
module’s Instruction Sheet. Modules vary in zeroing
procedures depending on module type.

4. Pressurize the pressure line with the pressure source
to the desired level as shown on the display.

If desired, continue pressing
display units to psi, mmHg, inHg, cmH

O@20 °C, inH2O@4 °C, inH2O@20 °C, mbar,

cmH

2

2

bar, kg/cm

, or kPa.

U to change pressure

O@4 °C,

2

36

725

MULTIFUNCTION CALIBRATOR

V mA

TC RTD

ZERO

Hz

C ˚F

˚

100%

25%

25%

0%

MEAS

SOURCE

STORE

SETUP

RECALL

V mA

LOOP

Figure 18. Connections for Sourcing Pressure

sh19f.eps

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Setting 0 % and 100 % Output Parameters

Setting 0 % and 100 % Output
Parameters

For current output, the calibrator assumes that 0 %
corresponds to 4 mA and 100 % corresponds to 20 mA.
For other output parameters, you must set the 0 % and
100 % points before you can use the step and ramp
functions. Proceed as follows:

1. If necessary, press

2. Select the desired source function and use the arrow
keys to enter the value. Our example is temperature
source using 100 °C and 300 °C values for source.

3. Enter 100 °C and press and hold
value.

4. Enter in 300 °C and press and hold
value.

M for SOURCE mode.

J to store the

G to store the

You can now use this setting for the following:

• Manually stepping an output with 25 % increments.

• Jump between the 0 and 100 % span points by

momentarily pushing

J or G.

Stepping and Ramping the Output

Two features are available for adjusting the value of
source functions.

• Stepping the output manually with the

keys, or in automatic mode.

• Ramping the output.

Stepping and ramping apply to all functions except
pressure, which requires that you use an external
pressure source.

Manually Stepping the mA Output

To manually step current output you can do the following:

• Use

• Touch momentarily either

H or I to step the current up or down in

25 % steps.

J to go to 0 %, or G

to go to 100 %.

H and I

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Users Manual

Auto Ramping the Output

Auto ramping gives you the ability to continuously apply a
varying stimulus from the calibrator to a transmitter, while
your hands remain free to test the response of the
transmitter.

When you press
continuously repeating 0 % - 100 % - 0 % ramp in your
choice of three ramp waveforms:

E 0 % - 100 % - 0 % 40-second smooth ramp

•

• P 0 % - 100 % - 0 % 15-second smooth ramp

N 0 % - 100 % - 0 % Stair-step ramp in 25 %

•

steps, pausing 5 seconds at each step. Steps are
listed in Table 7.

To exit ramping, press any button.

Step 4 to 20 mA

0 % 4.000
25 % 8.000
50 % 12.000
75 % 16.000
100 % 20.000

L, the calibrator produces a

Table 7. mA Step Values

Storing and Recalling Setups

You can store up to eight of your settings in a nonvolatile
memory and recall the settings for later use. A low battery
condition or a battery change does not jeopardize the
stored settings. Proceed as follows:

1. After you create a calibrator setup, press
display, the memory locations appear.

2. Press

3. Press S, only the stored memory location will be

To recall setups, proceed as follows.

1. Press

2. Press

Y or Z to select locations one through eight. An

underscore appears below the selected memory
location.

displayed.

The setup is stored.

Q. The memory locations appear on the

display.

Y or Z to select the appropriate location and
Q.

press

S. In the

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