Omega i Series User manual

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User’s Guide
Temperature & Humidity Monitor
DPiTH-i8DH, -i8DV, -i16D, -132
Temperature & Humidity Limit Alarm
CNiTH-i8DH-AL,i8DV-AL, -i16D-AL, -i32-AL

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves
the right to alter specifications without notice.
Servicing North America:
U.S.A. Omega Engineering, Inc.
Headquarters: 800 Connecticut Ave. Suite 5N01, Norwalk, CT 06854
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]
For Other Locations Visit omega.com/worldwide
omega.com [email protected]

TABLE OF CONTENTS
Part 1: Introduction............................................................................................2
1.1 Description .................................................................................2
1.2 Safety Considerations ...............................................................3
1.3 Before You Begin .......................................................................4
Part 2: Setup.......................................................................................................5
2.1 Front Panel .................................................................................5
2.2 Rear Panel Connections............................................................6
2.3 Electrical Installation .................................................................7
2.3.1 Power Connections........................................................7
2.3.2 Humidity and Temperature Probe.................................8
2.3.3 Wiring Outputs - Wiring Hookup...................................9
2.3.4 Dual Display Color Setup.............................................11
Part 3: Operation: Configuration Mode .........................................................12
3.1 Introduction ..............................................................................12
Turning your Instrument On for the First Time
Buttons Functions in Configuration Mode
3.2 Menu Configuration ................................................................13
3.2.1 ID Number .....................................................................14
3.2.2 Setpoints .......................................................................15
3.2.3 Configuration Menu ....................................................15
3.2.4 Reading Configuration Menu .....................................16
3.2.5 Alarm 1 Menu ...............................................................17
3.2.6 Alarm 2 Menu................................................................21
3.2.7 Reading Adjust Menu...................................................22
3.2.8 Setpoint Deviation Menu .............................................22
3.2.9 ID Code Menu ...............................................................23
3.2.10 Communication (Options) Menu.................................25
3.2.11 Display Color Selection Menu.....................................31
Part 4: Specifications ......................................................................................34
Part 5: Factory Preset Values .........................................................................36
CE APPROVAL INFORMATION .......................................................................37
i

LIST OF FIGURES:
Figure 2.1 Front Panel Display..............................................................................5
Figure 2.2 Rear Panel Power and Output Connections ......................................6
Figure 2.3 Rear Panel Input Connections ............................................................6
Figure 2.4 Main Power Connections.....................................................................7
Figure 2.5 Probe Wiring Hookup...........................................................................8
Figure 2.6 Output Connections:
a) Mechanical Relay and SSR Outputs – Wiring Hookup...............9
b) Pulse Output – Wiring Hookup .....................................................9
Figure 2.7 Typical Application ...............................................................................9
Figure 2.8 Snubber Circuits Wiring Hookup ......................................................10
Figure 2.9 Communication Output:
a) RS-232 Output – Wiring Hookup ................................................10
b) RS-485 Output – Wiring Hookup ................................................10
Figure 2.10 Excitation Output................................................................................10
Figure 2.11 i/8D Locations of S1 and Selectable Jumper Positions..................11
Figure 2.12 i/16D Location of S1 and Selectable Jumper Positions..................11
Figure 3.1 Flow Chart for ID and Setpoints........................................................13
Figure 3.2 Flow Chart for Configuration Menu ..................................................15
Figure 3.3 Flow Chart for Reading Configuration Menu ...................................16
Figure 3.4 Flow Chart for Alarm 1 .......................................................................17
Figure 3.5 Flow Chart for Alarm 2 .......................................................................21
Figure 3.6 Flow Chart for Reading Adjust Menu ................................................22
Figure 3.7 Flow Chart for Setpoint Deviation Menu...........................................22
Figure 3.8 Flow Chart for ID Code.......................................................................23
Figure 3.9 Flow Chart for Communication Option ............................................25
Figure 3.10 Flow Chart for Display Color Selection............................................31
LIST OF TABLES:
Table 2.1 Front Panel Annunciators....................................................................5
Table 2.2 Rear Panel Connector..........................................................................6
Table 2.3 Fuse Requirement ................................................................................7
Table 3.1 Button Function in Configuration Mode...........................................12
Table 3.2 Command Letters and Suffix for iTH ...............................................26
Table 5.1 Factory Preset Values ........................................................................36
ii

NOTES, WARNINGS and CAUTIONS
Information that is especially important to note is identified by following labels:
• NOTE
• WARNING or CAUTION
• IMPORTANT
• TIP
NOTE: Provides you with information that is important to successfully
setup and use the Programmable Digital Meter.
CAUTION or WARNING: Tells you about the risk of electrical shock.
CAUTION, WARNING or IMPORTANT: Tells you of circumstances or
practices that can effect the instrument’s functionality and must refer
to accompanying documents.
TIP: Provides you helpful hints.
1

PART 1
INTRODUCTION
1.1 Description
The iTH Series instruments monitor and control both temperature and relative humidity.
• Used with an iTH probe the controller comes with dual displays. The top displays
relative humidity and the bottom displays temperature. Relative Humidity can be
toggled with Temperature readings (by pressing the bbutton) or Dewpoint readings
(by pressing the cbutton). Dewpoint is the temperature at which water vapor from
the air begins to form droplets and condenses on surfaces that are colder than the
dewpoint of air.
• The temperature and humidity control can be achieved by using on/off or PID
heat/cool control strategy. Control can be optimized with an auto tune feature. The
instrument offers a ramp to setpoint with timed soak period before switching off the
output.
The instruments are simple to configure and use, while providing tremendous versatility
and a wealth of powerful features. The iTH Series instruments are available either as
monitors or controllers. The monitors are extremely accurate programmable digital panel
meters displaying humidity, temperature, or dew point. The controllers also provide dual
loop control for both humidity and temperature and are easily programmed for any
control or alarming requirement from simple on-off to full autotune PID control.
The iTH family of meters and controllers are available in four true DIN Sizes with NEMA 4 /
Type 4, IP65 splash resistant bezels: the ultra compact 1/32 DIN (the world's smallest dual
loop Humidity + Temperature controller); the popular midsize 1/16 DIN square bezel with
dual display; the 1/8 DIN vertical, and the 1/8 DIN horizontal with the big bright 21mm digits.
The iTH series LED displays can be programmed to change color between Green,
Amber, and Red at any set point or alarm point.
The iTH controller models offer a choice of two control or alarm outputs in almost any
combination: solid state relays (SSR); Form "C" SPDT (Single Pole Double Throw)
relays; pulsed 10 Vdc output for use with an external SSR; or Analog Output selectable
for control or retransmission of the process value. Universal power supply accepts 90 to
240 Vac. Low voltage power option accepts 24 Vac or 12 to 36 Vdc.
The Networking and Communications options include direct Ethernet LAN connectivity
with an Embedded Web Server, and serial communications. The -C24 serial
communications option includes both RS-232 and RS-485. Protocols include both
MODBUS and a straightforward ASCII protocol. The -C4EI option includes both Ethernet
and RS-485 ASCII/MODBUS on one device.
The iTH Series meters and controllers are designed for easy integration with popular
industrial automation, data acquisition and control programs as well as Microsoft Visual
Basic and Excel. provides free configuration and data acquisition software and demos
which makes it fast and easy to get up and running with many applications.
2

1.2 Safety Considerations
This device is marked with the international caution symbol. It is important
to read this manual before installing or commissioning this device as it
contains important information relating to Safety and EMC
(Electromagnetic Compatibility).
This instrument is a panel mount device protected in accordance with
EN 61010-1:2001, electrical safety requirements for electrical equipment
for measurement, control and laboratory. Installation of this instrument
should be done by qualified personnel. In order to ensure safe operation,
the following instructions should be followed.
This instrument has no power-on switch. An external switch or circuit-
breaker shall be included in the building installation as a disconnecting
device. It shall be marked to indicate this function, and it shall be in close
proximity to the equipment within easy reach of the operator. The switch or
circuit-breaker shall meet the relevant requirements of IEC 947–1 and
IEC 947-3 (International Electrotechnical Commission). The switch shall
not be incorporated in the main supply cord.
Furthermore, to provide protection against excessive energy being drawn
from the main supply in case of a fault in the equipment, an overcurrent
protection device shall be installed.
• Do not exceed voltage rating on the label located on the top of the
instrument housing.
• Always disconnect power before changing signal and power
connections.
• Do not use this instrument on a work bench without its case for safety
reasons.
• Do not operate this instrument in flammable or explosive atmospheres.
• Do not expose this instrument to rain or moisture.
• Unit mounting should allow for adequate ventilation to ensure
instrument does not exceed operating temperature rating.
• Use electrical wires with adequate size to handle mechanical strain
and power requirements. Install without exposing bare wire outside the
connector to minimize electrical shock hazards.
EMC Considerations
• Whenever EMC is an issue, always use shielded cables.
• Never run signal and power wires in the same conduit.
• Use signal wire connections with twisted-pair cables.
• Install Ferrite Bead(s) on signal wires close to the instrument if EMC
problems persist.
Failure to follow all instructions and warnings may result in injury!
3

1.3 Before You Begin
Inspecting Your Shipment:
Remove the packing slip and verify that you have received everything
listed. Inspect the container and equipment for signs of damage as soon
as you receive the shipment. Note any evidence of rough handling in
transit. Immediately report any damage to the shipping agent. The carrier
will not honor damage claims unless all shipping material is saved for
inspection. After examining and removing the contents, save the packing
material and carton in the event reshipment is necessary.
Customer Service:
If you need assistance, please call the nearest Customer Service
Department, listed in this manual.
Manuals, Software:
The latest Operation and Communication Manual as well as free
configuration software and ActiveX controls are available from the
website listed in this manual or on the CD-ROM enclosed with your
shipment.
For first-time users: Refer to the QuickStart Manual for basic operation
and set-up instructions.
If you have the Serial Communications/Ethernet Option you can easily
configure the unit on your computer or on-line.
To Reset the Meter:
When the unit is in the "MENU" Mode, push conce to direct the unit
one step backward of the top menu item.
Push ctwice to reset the unit, prior to resuming "Run" Mode except
after "Alarms", that will go to the "Run" Mode without resetting the unit.
4

PART 2
SETUP
2.1 Front Panel
Figure 2.1 Front Panel Display
The upper display may be RH, Temperature or Dewpoint readings
depending on your Reading Configuration selections. Factory defaults
are shown in Figure 2.1.
The Dual Display allows the user to observe the
Relative Humidity or Dewpoint (upper display) and Temperature Value
(lower display), at the same time.
Table 2.1 Front Panel Annunciators
1Output 1/Setpoint 1/ Alarm 1 indicator
2Output 2/Setpoint 2/ Alarm 2 indicator
°C °C unit indicator for Temperature or Dewpoint
°F °F unit indicator for Temperature or Dewpoint
%RH Display shows the Percent Relative Humidity
DDisplay shows the Dewpoint
aChanges display to Configuration Mode and advances through menu items*
bUsed in Program Mode:
On Dual Display: swaps the upper and lower displays from RH readings to
Temp e rat u r e rea d i ngs . N o te: t h is el i m ina t e s the s m a ll LE D e nnu c i ato r s *
On Single Display units: replaces RH readings to Temperature readings*
cUsed in Program Mode:
On Dual Display: changes upper display from RH readings to Dewpoint readings*
On Single Display units: replaces RH readings to Dewpoint readings*
d
Accesses submenus in Configuration Mode and stores selected values*
* See Part 3 Operation: Configuration Mode.
Relative Humidity
Upper Display
Temperature
Lower Display
iTH-i16D iTH-i8DH
iTH-i32
iTH-i8DV
D
2
1
%RH
%RH
%RH
D
D
1.00
[25.4]
2
1
2
1
1
1
C
F
2
1
1
D
%RH
2
5
Refer to the Quick Start
Guide for assembly and
disassembly instructions.

2.2 Rear Panel Connections
The rear panel connections are shown in Figures 2.2 and 2.3.
Figure 2.2 Rear Panel Power and Output Connections
Figure 2.3 Rear Panel Input Connections
Table 2.2 Rear Panel Connector
POWER AC/DC Power Connector: All models
INPUT iTH-PROBE
OUTPUT 1 Based on one of the following models:
Relay SPDT
Solid State Relay
Pulse
OUTPUT 2 Based on one of the following models:
Relay SPDT
Solid State Relay
Pulse
OPTION Based on one of the following models:
RS-232C or RS-485 programmable
Excitation
BLACK(RTN)
WHITE(CLK)
GREEN(DATA)
RED(VCC)
SHIELD
N/C
8 7 6 5 4 3 2 1
6 5 4 6 5 4 6 5 4 3 2 1 3 2 1
6
Output 1 and 2 are for -AL Limit Alarm Option Only
Output 1 and 2
are for -AL Limit
Alarm Option Only

2.3 Electrical Installation
2.3.1 Power Connections
Caution: Do not connect power to your device until you have completed all
input and output connections. Failure to do so may result in injury!
Connect the main power connections as shown in Figure 2.4.
Figure 2.4 Main Power Connections
Table 2.3 Fuse Requirement (see specifications)
FUSE Connector Output Type For 115Vac For 230Vac DC
FUSE 1 Power N/A 100 mA(T) 100 mA(T) 100 mA(T)
FUSE 2 Power N/A N/A N/A 400 mA(T)
For the low voltage power option, in order to maintain the same degree of
protection as the standard high voltage input power units (90 - 240 Vac),
always use a Safety Agency Approved DC or AC source with the same
Overvoltage Category and pollution degree as the standard AC unit (90 -
240 Vac).
The Safety European Standard EN61010-1 for measurement, control,
and laboratory equipment requires that fuses must be specified based on
IEC127. This standard specifies for a Time-lag fuse, the letter code “T”.
The above recommended fuses are of the type IEC127-2-sheet III. Be
aware that there are significant differences between the requirements
listed in the UL 248-14/CSA 248.14 and the IEC 127 fuse standards. As a
result, no single fuse can carry all approval listings. A 1.0 Amp IEC fuse
is approximately equivalent to a 1.4 Amp UL/CSA fuse. It is advised to
consult the manufacturer’s data sheets for a cross-reference.
7
Use copper conductors
only for power connections

2.3.2 Humidity and Temperature Probe
The figure below shows the wiring hookup for the temperature and humidity
probe.
Choose one which gives the best signal integrity-
1) Connect Probe’s Shield to RTN if Probe Housing is not connected to
Earth Ground.
OR
2) Connect Probe’s Shield to Earth Ground if Probe Housing is not
connected to Earth Ground.
Figure 2.5 Probe Wiring Hookup
8
BLACK(RTN)
WHITE(CLK)
GREEN(DATA)
RED(VCC)
SHIELD(See Note)
N/C
METAL HOUSING
IS CONNECTED
TO SHIELD WIRE

9
2.3.3 Wiring Outputs
This meter, if ordered with -AL Limit Alarm option, has two factory installed
outputs. The SPDT Mechanical Relay, SPST Solid State Relay, and Pulse
Connections are shown below.
Figure 2.6
a) Mechanical Relay and SSR b) Pulse Output Wiring Hookup
Outputs Wiring Hookup
Figure 2.7 Typical Applications
TEMPERATURE
CONTROLLER CONTROL
SIDE
dc INPUT
SSR
ac INPUT
SSR
ac INPUT
SSR
LOAD
SIDE HEATER
Vac
Vac
dc CONTROLLED SSR USED WITH TEMPERATURE CONTROLLER WITH dc VOLTAGE SSR DRIVER OUTPUT
FAST BLOW
FUSE
0 or 5 Vdc,
TYPICALLY
4
3
1
2
TEMPERATURE
CONTROLLER CONTROL
SIDE
LOAD
SIDE HEATER
Vac
Vac
ac CONTROLLED SSR USED WITH TEMPERATURE CONTROLLER WITH MECHANICAL RELAY OUTPUT
FAST BLOW
FUSE
Vac
DRIVING
SSR
4
3
1
2
TEMPERATURE
CONTROLLER
CONTROL SIDE
LOAD
RESISTOR LOAD
SIDE HEATER
Vac
Vac
ac CONTROLLED SSR USED WITH TEMPERATURE CONTROLLER WITH TRIAC OUTPUT
FAST BLOW
FUSE
Vac
DRIVING
SSR
4
3
1
2
Use copper conductors
only for power connections

10
This device has snubber circuits designed to
protect the contacts of the mechanical relays
when it switches to inductive loads (i.e.
solenoids, relays). These snubbers are internally
connected between the Common (C) and
Normally Open (NO) relay contacts of Output 1
and Output 2.
If you have an inductive load connected
between Common (C) and Normally
Closed (NC) contacts of the mechanical
relays and you want to protect them from
the rush current during the switching
period, you have to connect an external
snubber circuit between Common (C)
and Normally Closed (NC) contacts as
indicated in Figure 2.8.
This device may have a programmable communication output. The RS-232 and
RS-485 Output Connection are shown below.
External RS-232 connections are not available with -EI or C4EI options.
Figure 2.9
a) RS-232 Output Wiring Hookup b) RS-485 Output Wiring Hookup
This device may also have an excitation output.
Figure 2.10 Excitation Output
Figure 2.8
Snubber Circuits Wiring
Hookup
Excitation is not available if Serial
Communication (-C24) or Ethernet
(-C4EI) or Low Voltage Power
Supply (-DC) option is installed.

11
2.3.4 Dual Display Color Setup
The dual display option allows the user to change the color of the upper and
lower displays.
To change the color of the upper display, see Section 3.2.14
(Display Color section).
To change the color of the lower display follow the instructions below:
The unit should be removed from the panel and opened.
Refer to the Quick Start Guide for assembly and disassembly instructions.
The S1 jumper is located on the back side of the display board.
The location of S1 and pin selection jumpers are shown below.
Use a jumper for GREEN or RED, never leave S1 open.
Figure 2.11 i/8 D Location of S1 and Selectable Jumper Positions
Figure 2.12 i/16D Location of S1 and Selectable Jumper Positions
i/8DH
Dual
Horizontal
i/8DV
Dual
Vertical

PART 3
OPERATION: Configuration Mode
3.1 Introduction
The instrument has two different modes of operation. The first, Run Mode, is
used to display Temperature and Relative Humidity. The other mode, Menu
Configuration Mode, is used to navigate through the menu options and
configure the unit. Part 3 of this manual will explain the Menu Configuration
Mode. For your instrument to operate properly, the user must first "program"
or configure the menu options.
Turning your Unit On for the First Time
The device becomes active as soon as it is connected to a power source. It
has no On or Off switch. The device at first momentarily shows the software
version number, followed by reset RST, and then proceeds to the Run Mode.
For first-time users: Refer to the QuickStart Manual for basic operation
and set-up instructions.
If you have the Serial Communications/Ethernet Option you can easily
configure the unit on your computer or on-line.
Table 3.1 Button Function in Configuration Mode
• To enter the Menu, the user must first press abutton.
• Use this button to advance/navigate to the next menu item. The user can
navigate through all the top level menus by pressing a.
• While a parameter is being modified, press ato escape without saving the
parameter.
•Presstheup
bbutton to scroll through “flashing” selections. When a
numerical value is displayed press this key to increase value of a parameter
that is currently being modified.
• Pressing the bbutton for approximately 3 seconds will speed up the rate at
which the set point value increments.
• In the Run Mode, pressing the bbutton changes display from RH readings
to Temperature readings.
•Pressthedowncbutton to go back to a previous Top Level Menu item.
•PressthisbuttontwicetoresettheunittotheRunMode.
•Whenanumericalvalueisflashing(exceptsetpointvalue)press
cto scroll
digits from left to right allowing the user to select the desired digit to modify.
• When a setpoint value is displayed press cto decrease value of a setpoint
that is currently being modified. Pressing the cbutton for approximately 3
seconds will speed up the rate at which the setpoint value is decremented.
• In the Run Mode, pressing the cbutton changes from RH readings to
Dewpoint readings.
•Presstheenterdbutton to access the submenus from a Top Level Menu item.
• Press dto store a submenu selection or after entering a value — the display
will flash a STRD message to confirm your selection.
•IntheRunMode,pressdtwice to enable Standby Mode with flashing STBY.
Reset: Except for Alarms, modifying any settings of the menu configuration
will reset the instrument prior to resuming Run Mode.
12
a
MENU
b
(UP)
c
(DOWN)
d
ENTER

13
3.2 Menu Configuration
It is required that you put the unit in the Standby Mode for any
configuration change other than Setpoints & Alarms.
Figure 3.1 Flow Chart for ID and Setpoints
RdG

14
3.2.1 ID Number
TO ENABLE/DISABLE OR CHANGE ID CODE, SEE SECTION 3.2.12.
If ID Code is Disabled or set as Default (0000) the menu will skip ID step
to Setpoint Menu.
If ID Code is set to Full Security Level and user attempts to enter the
Main Menu, they will be prompted for an ID Code.
If ID Code is set to Setpoint/ID Security Level and user attempts to enter
the Configuration Menu, they will be prompted for an ID Code.
ENTERING YOUR NON-DEFAULT FULL SECURITY ID NUMBER.
Press a1) Display shows ID.
Press d2) Display advances to ____.
Press b& c3) Press bto increase digit 0-9. Press cto activate next digit
(flashing). Continue to use band cto enter your 4-digit ID
code.
Press d4) If the correct ID code is entered, the menu will advance to the
Setpoint 1 Menu, otherwise an error message ERRo will be
displayed and the instrument will return to the Run Mode.
To change ID Code, see ID Menu in the Configuration section.
ENTERING YOUR NON-DEFAULT SETPOINT/ID SECURITY ID NUMBER.
Press a5) Display shows SP1 Setpoint 1 Menu.
Press a6) Display shows SP2 Setpoint 2 Menu.
Press a7) Display shows ID ID Code Menu.
Press d8) Display advances to ____.
Press b& c9) Use band cto change your ID Code.
Press d10) If correct ID Code is entered, the display will advance to the
INPT Input Menu, otherwise the error message ERRo will be
displayed and the unit will return to the Run Mode.
To prevent unauthorized tampering with the setup parameters, the
instrument provides protection by requiring the user to enter the ID Code
before allowing access to subsequent menus. If the ID Code entered
does not match the ID Code stored, the unit responds with an error
message and access to subsequent menus will be denied.
Use numbers that are easy for you to remember. If the ID Code is
forgotten or lost, call customer service with your serial number to access
and reset the default to 0000.

15
3.2.2 Set Points
SETPOINT 1:
Press a1) Press a, if necessary until SP1 prompt appears.
Press d2) Display shows previous value of “Setpoint 1”.
Press b& c3) Press band cto increase or decrease Setpoint 1
respectively.
Holding b& cbuttons down for approximately 3 seconds will speed up the
rate at which the Setpoint value increments or decrements.
Press b& c4) Continue to use band cto enter your 4-digit Setpoint 1 value.
Press d5) Display shows STRD stored message momentarily and then
advances to SP2 only, if a change was made, otherwise press
ato advance to SP2 Setpoint 2 Menu.
SETPOINT 2:
Press d6) Display shows previous value of “Setpoint 2”.
Press b& c7) Press band cto increase or decrease Setpoint 2
respectively.
Holding b& cbuttons down for approximately 3 seconds will speed up
the rate at which the setpoint value increments or decrements.
Press d8) Display shows STRD stored message momentarily and then
advances to CNFG only, if a change was made, otherwise press
ato advance to CNFG Configuration Menu.
3.2.3 Configuration Menu
Figure 3.2 Flow Chart for Configuration Menu

16
3.2.4 Reading Configuration
It is required that you put the unit in the Standby Mode for any
configuration change other than Set Points & Alarms.
Figure 3.3 Flow Chart for Reading Configuration Menu
ENTER READING CONFIGURATION MENU:
Press a1) Press a, if necessary, until CNFG prompt appears.
Press d2) Display advances to RDG Reading Configuration Menu.
Press d3) Display advances to SNSR Sensor.
SENSOR SUBMENU:
Press d4) Sensor selection for Autotune, Loop (Reading Offset Adjust), or
Ramp and Soak °F.°C is for temperature and DRRh is for
Humidity.
TEMPERATURE UNIT SUBMENU:
Press d5) Display flashes previous Temperature Unit selection.
Press b6) Scroll though the available selections to the Temperature Unit
of your choice: °F or °C.
Press d7) Display shows STRD stored message momentarily and then
advances to FLTR Filter Constant.
FILTER CONSTANT SUBMENU:
Press d8) Display flashes previous selection for Filter Constant.
Press b9) Scroll though the available selections:
0001,0002,0004,0008,0016,0032,0064,0128
Press d10) Display shows STRD stored message momentarily only, if
change was made, otherwise press ato advance to the next
menu.
The Filter Constant Submenu allows the user to specify the
number of readings stored in the Digital Averaging Filter.