Martel Electronics 235 User Manual
MODEL 230/235
Temperature Calibrator
User’s Guide
Temperature Calibrator
Model 230
ON
OFF
BAT
CK
CE
ZERO
V
mV
mA
7
4
1
.
8
9
TC
RTD
In
Put
5
6
Ramp
Ω
Out
Put
2
3
Auto
-
0
Ent
Opt
Set
Up
INPUT
V/TC mA 2W 4W
3W
OUTPUT
Ω/RTD V/TC
ECJ
Beta Model 230 Calibrator
See back cover for Model 235
Table of Contents
Introductions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . 1
Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Power On Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 3
Input/Output Selection . . . . . . . . . . . . . . . . . . . . . . . 5
Menu Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Battery Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
INC/DEC Key Functions . . . . . . . . . . . . . . . . . . . . . . . . 7
CE/ZERO Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Auto Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Option Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ramp Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
% Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SYS Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Using Calibration System . . . . . . . . . . . . . . . . . . . . . . 14
Using Calibration System (manual). . . . . . . . . . . . . . . . . 16
Operator Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
External Temperature Compensation Module . . . . . . . . . . .31
Input Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Volts/Millivolts . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Milliamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
TC (Thermocouples). . . . . . . . . . . . . . . . . . . . . . . . . 33
RTD/Ω . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Pressure Module . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Trip Detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Min-Max Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Input Reading in Percent of Scale . . . . . . . . . . . . . . . . . 43
230/235 i
Output Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Volts/Millivolts . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Milliamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Thermocouple Simulation. . . . . . . . . . . . . . . . . . . . . . 46
Ramp Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Auto Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
mA/V Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Ohm/RTD Module (Optional) . . . . . . . . . . . . . . . . . . . 57
Loop Power Supply (Optional) . . . . . . . . . . . . . . . . . . . 57
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
mV to Current Converters . . . . . . . . . . . . . . . . . . . . . 59
Thermocouple 2-Wire Transmitter . . . . . . . . . . . . . . . . 60
RTD to Current 2-Wire Transmitter . . . . . . . . . . . . . . . . 62
3-Wire Platinum RTDs . . . . . . . . . . . . . . . . . . . . . . . 63
Using Ramp and Trip Detect . . . . . . . . . . . . . . . . . . . . 64
mA/V Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Pressure Module . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Loop Powered Differential Pressure . . . . . . . . . . . . . . . . 69
Using Loop Power Supply (LPS) . . . . . . . . . . . . . . . . . . 70
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
mA/V Module Error Messages . . . . . . . . . . . . . . . . . . 73
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Return for Calibration/Repair . . . . . . . . . . . . . . . . . . . 74
Fuse Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 77
mA/V Module Service Information . . . . . . . . . . . . . . . . . 79
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
ii 230/235
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . 82
Output Specifications . . . . . . . . . . . . . . . . . . . . . . . 85
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
mA/V Module Specifications . . . . . . . . . . . . . . . . . . . . 89
Pressure Module Specifications . . . . . . . . . . . . . . . . . . 90
Loop Power Supply Specifications . . . . . . . . . . . . . . . . . 91
230/235 iii
Introduction
General Description
The Model 230/235 Temperature Calibrators are compact, versatile,
functionally styled calibrators. These units are menu driven so
technicians can immediately begin using them to their fullest
capabilities without extensive training.
The Model 230/235 consists of four functional areas:
At the top is an alphanumeric liquid crystal display (LCD) for
simultaneous indication of input and output readings and operator
prompting. The Model 230 uses a 2 line display while the Model 235
uses a 4 line display.
The center section is a tactile membrane keyboard for operator entry.
The lower section contains recessed input/output jacks for connecting
the supplied test leads to the device being calibrated.
There is a feature connector located at the lower end of the
instrument, below the terminals, which is used to connect external
modules to the calibrator to expand the calibrator’s capability. This
connector is also used to calibrate the Model 230/235 calibrator and as
the RS-232 interface to the Calibration System Database.
Introduction 230/235 1
Battery Charging
Note: Before using the Model 230/235 calibrator for the first time,
it is necessary to charge the batteries for a minimum of 14 to
16 hours.
CALIBRATOR CHARGER
INPUT: 120VAC 60 HZ
OUTPUT: 5.8VDC 200 mA
For use only with
Beta Calibrators
Units are shipped with the internal batteries in an uncharged state.
The calibrator battery charger is a wall plug-in type (see below) which
connects to a jack on the right-hand side of the instrument. Battery
operation time is 7-8 hours, typically.
2 230/235 Introduction
Operation
CAUTION: The operation of the calibrator may be impaired if a two way radio is keyed near the unit.
BETA Calibrator
Last cal 080593
The Model 230/235 Temperature Calibrators are user friendly and
menu driven. A first time user can normally start operating the unit
with little or no instruction. The following instructions are intended to
provide a detailed understanding of the unit.
Power On Sequence
The calibrator is turned on or off by pressing the ON/OFF key. Each
time it is turned on, a series of internal tests and calibrations are
performed. The start up tests provide pass/fail tests of certain internal
circuitry. If the tests determine the unit has an internal failure, a
message is displayed and the unit may or may not allow further
operation. A list of error messages can be found on page 71.
The start up calibrations provide for dynamic recalibration of the
internal calibrator support circuitry by applying the primary reference
voltages to points in the circuitry and recording the readings as
references for further measurements. The start up auto calibration
does not in any way affect the primary calibration done at the factory
or at a field metrology lab.
During the time the start up tests and calibrations are being performed,
certain informational displays are presented to show the status of the
calibrator. The first message displayed will be:
Operation 230/235 3
This indicates the date in MMDDYY format of the last factory
property of
YOUR NAME HERE
Auto Calibration
in progress
Select Select
Input Output
Select Select
Input Output
Apr 26 12:21:18
calibration. The example indicates the Model 230/235 was calibrated
on August 5, 1993.
The next display will be:
This shows the name of the owner of the calibrator. The above display
shows the default setting as the calibrator is shipped. The name can be
changed by selecting “owner” from the setup menu. See page 25 for
details on how to change the owner’s name.
The next display will be:
This display will remain until the internal tests and calibrations are
finished, followed by the main prompt display:
On the Model 235 calibrator four line display, the time and date are
displayed.
This display indicates the calibrator is operating properly and is ready to
accept input or output function selections.
Operation 230/235 4
Input/Output Selection
The Model 230/235 calibrator has a single set of function keys for
controlling both input measurements and output simulation. The input
measurement section of the calibrator is completely isolated from the
output simulation section.
To select input or output functions the INPUT and OUTPUT keys are
used. The calibrator is in output mode following power on.
Pressing the INPUT key places the calibrator in input mode, and
pressing any function key will cause the input to begin measurements
using that function.
Pressing the OUTPUT key places the calibrator in the output mode, and
pressing any function key will cause the output to request the value to
be simulated.
The current mode of the calibrator is indicated by the position of the
blinking cursor. When the calibrator is in input mode, the cursor is on
the leftmost column. When the calibrator is in output mode the cursor
is on the rightmost column.
The calibrator stays in the last mode selected until the mode is changed
by pressing the alternate key. For example, if you press INPUT and then
V, the calibrator will begin measuring volts. If you then press MV, the
input will begin measuring millivolts. If you then press OUTPUT
followed by V, the output function will respond by requesting the value
for the voltage.
Changing the input and output mode in no way affects the functions in
operation at the time. Input and output functions operate
simultaneously and without interaction. Input or output mode simply
indicates whether subsequent keystrokes will be applied to the input or
output function.
Operation 230/235 5
Menu Selection
The Model 230/235 calibrator has several functions that require
additional information once the function has been selected. The
additional information is entered by picking from a menu or list of
items. For example, when selecting the Thermocouple function, you
must pick the type of thermocouple and the temperature scale.
A detailed description of the menu is provided with each function that
has menu choices. The following general information will provide an
understanding of the operation of the menus.
The menus are composed of a title (the top line) and a list of choices
(the bottom line). The title will indicate which parameter you are
entering.
On the bottom line, one of the choices will be blinking. This indicates
the active choice and the one that will be used if you press ENT. To
select a different choice, use the INC and DEC keys. The INC key moves
the choice to the right and the DEC key moves the choice to the left. If
there are more choices than will fit on one line, the additional choices
will scroll into view as you move the selection past the rightmost
choice. When the desired choice is blinking, press ENT. If you find
yourself in a function menu by mistake, pressing CE will cancel the
menu and return the calibrator to the previous or idle state as
appropriate.
Battery Check
The BAT CK key may be pressed at any time to display the current
battery voltage for approximately 1 second before the normal display
returns. The current input and output function are not disturbed by
making a battery check measurement.
The battery voltage should be between 5.3 and 4.6 volts. When the
Operation 230/235 6
voltage falls below 4.65 volts, a warning message is displayed is
displayed approximately every minute. When the voltage falls below
4.5 volts for 1 minute, the calibrator will turn itself off to prevent
damage to the batteries due to possible cell reversal.
INC/DEC key functions
The INC and DEC keys are represented on the keyboard by up and down
arrow symbols respectively. They are multifunction in nature. Their
use is explained in detail in each section of the manual where they are
used. The following is intended to give an overall understanding of
their use.
With menus:
When a menu is displayed, the INC and DEC keys act as “cursor”
keys to move the highlight to the selection that you wish to make.
In general, the INC key moves the selection to the right or forward,
the DEC key moves the selection to the left or backward. Once you
have selected the correct item, press ENT.
With Input functions:
When the calibrator is displaying an input reading and is in the input
mode, i.e., the INPUT key was last pressed, the INC key causes the
maximum and minimum values to be displayed. See the description
of Min-Max mode for a full description.
With Output functions:
When the calibrator is outputting a variable and is in the output
mode, i.e., the OUTPUT key was last pressed, the INC and DEC keys
cause the output to change in one of the following manners. If
ramp is active, the INC or DEC key will start the ramp in the positive
or negative direction. If CalPts are enabled, the INC or DEC key will
select the next or previous calibration point from the user defined
list. If CalPts are not enabled, the output is increased or decreased
by the user defined percent of selected scale.
Operation 230/235 7
CE/ZERO Key
When the calibrator is in the output mode and you press any of the
numeric keys (0-9), the keystrokes will be displayed until you press ENT
and the value is accepted by the output function. If you make a keying
error, the CE key is used to clear the erroneous entry and allow the
correct value to be re-entered. If you press CE a second time before
entering any numeric data, the keypad display mode is canceled and
the calibrator returns to displaying the actual output simulation value.
When the calibrator is in the input mode the CE/ZERO key acts as a zero
adjustment. This is used mostly on functions such as 2-wire ohms and
when using the external pressure module, but can be used on any Input
function. When the key is pressed, the most recent reading is retained
as the “zero point” and all subsequent readings have the zero point
subtracted from them prior to being displayed.
When the calibrator is displaying a menu, the CE/ZERO key acts as a
CANCEL key to terminate the menu and return to the previous function
or the idle state.
Auto Key
The AUTO key is used in conjunction with the calibration points or
Ramp functions to automatically repeat the function. The time
interval between the automatic repeats is determined by Setup option
“Pause.” The time can range from 5 to 10,000 seconds. The Model 235
uses the AUTO key with the “System” function.
The operation of the AUTO key is covered in detail with the Calibration
Points and Ramp functions.
Operation 230/235 8
Option Key
Pressure Module
PSIG 30
Serial No. 2045
LastCal 080593
The OPT key is used to activate the external module that is attached to
the feature connector of the Model 230/235 calibrator. When the OPT
key is pressed for the first time after the calibrator is powered on, the
calibrator reads the configuration and calibration data from the
attached module. If no valid module is attached, or if the attached
module is not supported by the software revision of the calibrator, an
error message will appear. A list of error messages and their meanings
can be found on page 71.
The first time the OPT key is pressed, a series of messages are displayed
listing the configuration of the module.
A typical display is:
The top line shows the module type and the second line gives the
range. The above example is for the 30 PSIG Pressure Module. The
second display is:
The top line shows the serial number of the module and the second line
shows the date of the last calibration. The displays will remain for
approximately 1 second each, and then the appropriate display for the
attached module will appear.
When the OPT key is pressed a subsequent time(s), the calibrator
checks the ID and serial number of the attached module. If these
match the previous values, the module is activated immediately,
bypassing the title and serial number displays.
The OPT key can be pressed when the calibrator is in input or output
mode, depending on the function of the attached external module.
Operation 230/235 9
If the module is not capable of operating in the mode requested, an
MCC #2 TT-101 34688-A1-B
SEQ=01 READY
error message will be displayed.
The operation of the Pressure Module can be found on page 36, that of
the mA/V Module can be found on page 54.
Ramp Key
The RAMP key is used to activate the ramp function which is covered in
the Output Functions section starting at page 54.
% Key (Model 235 Only)
The % Key allows easy access to the % Error Function. If the % ERR
Function has been set up using the SETUP menus (see page 19), press
the % Key to alternate between the Engineering Unit display and the %
ERR display.
SYS Key (Model 235 Only)
The SYS Key allows the Model 235 Calibrator to be used with a
Calibration System Database. Refer to the Calibration System Database
Instruction Manual for system information. Operation of the calibrator
is covered in this manual.
To enter the System mode of operation, press the SYS Key. The display
will show the tag number of an instrument previously loaded into its
memory on the top two lines of the display. Additionally, its sequence
in the group previously loaded from 01 to 28, and whether or not it has
been calibrated, is also indicated.
Operation 230/235 10
If no tags have been entered, the display will indicate:
- - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - SEQ=01 EMPTY
MCC#2 TT-10134688-A1-B
REVIEW TEST
CLEAR ALL DATA
MA mVOLTS
+4.000 +10.000
AUTO TO START
CE TO ABORT
If calibration is complete, the display will indicate “Pass” or “Fail”
instead of “Ready”.
Pressing the INC/DEC key will allow the user to scroll through the tag
list. To directly view the desired tag, type its two digit sequence number
on the numeric keypad. Press SYS to exit the system mode; to
continue, press ENT when the desired instrument tag is displayed.
The selected tag will be displayed on the top two lines. The third line
gives the user the option to review the test points for the selected
instrument or proceed to the test. Pressing the INC/DEC key to cause
the desired menu to flash, then pressing ENT will advance the calibrator
to the next step.
Pressing CE will put the calibrator back to the beginning of the
sequence in all cases.
If “TEST” is selected and the ENT key is pressed, the calibrator will
automatically select the proper input and output mode for the
instrument tag selected and provide the proper output for the first
calibration point. Additionally, the operator will be prompted to press
AUTO to start the test or press CE to abort.
Operation 230/235 11
If “Review” was selected, the test points would be displayed.
INPUT OUTPUT
+4.000 +10.000
+6.000 +20.000
+8.000 +30.000
MA mVOLTS
+4.000 +10.000
TESTING CALPT 01
AS FOUND
TEST COMPLETE
UNIT FAILED
REVIEW ADJUST
RETEST DONE
Press the INC/DEC keys to scroll through additional points. Press ENT or
CE to return to the previous menu.
Clear All Data allows “As Found” and “As Left” data previously stored to
be cleared. This option is only allowed if enabled by the Calibration
System. If this option is not enabled, the display will not have Clear All
Data as an option beneath the REVIEW and TEST options.
If AUTO was pressed to start the “As Found” test, the display will
indicate:
Once the test is completed, the display will indicate “Test Complete” on
the top line, whether the unit passed or failed on the second line and,
give the operator four choices on lines three and four - Review, Adjust,
Retest, Done. Selecting “Review” allows the operator to review the test
data, selecting “Retest” allows the test to be run again, selecting
“Done” takes the calibrator to the final sequence, selecting “Adjust”
allows the operator to adjust the instrument under test.
Selecting “Adjust” allows the operator to perform a normal calibration
procedure on the instrument under test. Pressing the INC/DEC key will
Operation 230/235 12
step the calibrator output through the calibration points.
MA mVOLTS
+4.000 +10.000
ADJUST UNIT
AUTO WHEN DONE
MA mVOLTS
+4.000 +10.000
AUTO TO START
CE TO ABORT
MA mVOLTS
+4.000 +10.000
TESTING CALPT 01
AS LEFT
TEST COMPLETE
UNIT PASSED
REVIEW DONE
Once the desired results are achieved, press AUTO as indicated on the
calibrator display.
When “AUTO” is pressed, the calibrator again sets itself at the first cal
point and prompts the operator to press AUTO again to start the “As
Left” calibration procedure.
Pressing CE will take the calibrator back to the Test Complete menu.
If AUTO is pressed, the calibrator proceeds with the “As Left”
calibration.
When the test is finished, the calibrator will display “Test Complete,
Unit Passed or Failed”, and give the operator the option to “Review”
data or select “Done”.
Operation 230/235 13
If “Done” is selected, the calibrator will prompt “Test Finished” and the
TEST FINISHED
ENTER TECH ID#
???????
UNIT FINAL STATUS
NO ACTION ADJUSTED
REPLACED
Invalid test
Config detected.
No Pressure
operator will be prompted to enter his/her ID number.
The operator will press ENT and then be prompted to indicate “Unit
Final Status” and choose from “Adjusted”, “Replaced”, or “No Action”.
Select the desired menu and press ENT.
At this time, the calibrator returns to the beginning mode and a new
tag number can be selected for the next calibration.
The calibrator records the time and date that Unit Final Status is
entered. Additionally, the number of calibration cycles required to
achieve a “Unit Passed” indication is also recorded.
Pressure Calibrations using
Calibration System
If the instrument being calibrated has pressure as either an input or
output, a Pressure Module with the appropriate range should be
attached to the calibrator before starting the test. If a Pressure Module
is not attached, an error message will be displayed.
Press any key to return to the Instrument Select Menu.
Operation 230/235 14
Note: It is the responsibility of the user to ensure that the Pressure
Module being used is the proper range for the calibration
being performed.
mA PSI
+ 4.000 +0.0000
Apply +1.0000
Press ENT Low
If the instrument being calibrated has a pressure output, no special
action is required during the automatic test. The pressure will be
monitored as the input function on the calibrator and will be recorded
automatically at each calibration point.
If the instrument being calibrated has a pressure input, the pressure
will have to be generated manually by the user. The pressure will be
monitored as the output function on the calibrator and will be recorded
after the user has set the pressure to within the prescribed limits and
then pressed the ENT key.
The following shows the main screen while performing a pressure
calibration requiring an externally generated pressure.
Line two gives the actual pressure being measured. Line three is
the target pressure for this cal point. Line four indicates that the
pressure is too low (or too high if display shows “HIGH” or within
tolerance if display reads “READY”.
When LOW or HIGH is being displayed, the applied pressure is not
within the tolerance specified in the Calibration Database and the
calibrator will not accept it. You may press CE to cancel the calibration
attempt if you are not able to generate the requested pressure.
Operation 230/235 15
When READY is being displayed, the applied pressure is within
Man_GPM mV
+10.000
Testing Calpt 01
As Found
Man_GPM mV
??????? +10.000
Enter Input Value
tolerance. You should wait until the actual pressure readings stabilize
and then press the ENT key. The calibrator will then store the readings
and step to the next calibration point.
Manual Calibration using
Calibration System
If the instrument being calibrated requires an input that cannot be
generated by the calibrator or if the output of the instrument cannot be
read by the calibrator, then the Calibration Database will indicate that
the instrument has a Manual input or output.
If the output of the instrument cannot be read by the calibrator, the
calibrator will be configured for Manual input. An example would be a
digital recorder with a mV input and a chart display as an output. The
calibrator will set its output to the required value, pause for the
number of seconds specified in the Calibration Database, and then
prompt the user to enter the indicated value in the engineering units
requested.
The display above is shown while the calibrator is setting its output and
waiting for the instrument to stabilize.
The display shown above is the calibrator prompting the user to enter
the value shown on the instrument’s digital indicator.
The three characters following Man_ (GPM, in this example) are the
engineering units expected as configured in the Calibration Database.
Operation 230/235 16
If the input to the instrument cannot be generated by the calibrator,
mA Man_GPM
+4.000 5000
Set Ext Output
Press Ent
mA Man_GPM
+4.000 10000
Set Ext Output
Enter Value
the calibrator will be configured for Manual output. An example might
be a magnetic flow meter that requires a manufacturer specific device
to simulate a flow into its input.
There is an additional feature associated with Manual outputs. The
Calibration Database can be configured to require that the user
generate the exact value specified, or that the user generate
approximately the values specified and then enter the exact value that
was set.
If the calibration procedure specifies exact values, the calibrator will
prompt the user to set the external calibration device to the desired
value and press ENT when ready. The calibrator will then store its input
reading and step to the next calibration point.
The display shown above is instructing the user to set the external
calibration device to simulate a flow of 5,000 gallons per minute and
then press ENT.
If calibration procedure specifies approximate values, the calibrator will
prompt the user to set the external calibration device to the desired
value and then enter the exact value that was set. The calibrator will
then store its input reading and step to the next calibration point.
The display above is instructing the user to set the external calibration
device to simulate a flow of approximately 10,000 gallons per minute.
If you are able to set exactly 10,000 GPM, then you enter 10000 on the
Operation 230/235 17
numeric keypad and then press ENT. If the closest you could get to the
desired value was 9,950 GPM, you would enter this value and press
ENT.
It is possible for an instrument to be configured for both Manual input
and Manual output. An example might be a glass thermometer that is
to be calibrated in a temperature bath. In this case the calibrator will
first prompt for the user to set the external output and then prompt
the user to enter the external input.
Operation 230/235 18
Operator Setup
1-LCD Vu 2-BatSav
3-IncDec 4-CJunct
1-Owner 2-Pause
3-MfgTst 4-Save
1-InpRdg 2-Damp
3-% err
1-LCD Vu 2-BatSav
3-IncDec 4-CJunct
5-Owner 6-Pause
7-SerItf 8-Save
1-% err 2-Damp
3-InpRdg
The SETUP key activates the operator setup mode. This allows the
operator to preset several convenience features to customize the
calibrator for a particular user or application. The SETUP can be
activated any time except when the calibrator is displaying a menu.
When the SETUP key is pressed, a screen is displayed on the Model 230
showing the first 4 options available.
If the INC or DEC keys are pressed, additional groups of setup options
are displayed.
The Model 235 displays 8 setup options on each screen.
If INC or DEC keys are pressed, additional groups of setup options are
displayed.
To select one of the options, press the number key corresponding to
the option you desire (you need not press ENT). To exit from setup
mode, press SETUP a second time. The individual options are described
below.
Operation 230/235 19
LCD Vu (Adjust LCD viewing angle)
Viewing Angle
sn 1355 uc 0300
Battery Save
Disable Enable
Note: All calibrators are shipped from the factory with battery save
enabled.
The LCD viewing angle or contrast may be adjusted electronically for
optimum viewing under various conditions. There are 8 levels to the
contrast adjustment. Press the INC or DEC key to select the adjustment
that is optimum for your conditions.
The second line of the viewing angle screen displays additional useful
information. The left side displays the serial number of the unit and
should agree with the serial number label on the case. The right side
displays the revision level of the internal software (microcode).
BatSav (Battery save)
The battery save feature will turn the calibrator off if there is no
keyboard activity for 10 minutes. This prevents running the batteries
down if the unit is accidentally turned on, or if the unit is left
unattended. Battery save should be enabled unless you have a specific
application where the calibrator needs to run attended for greater than
10 minutes.
Select either Disable or Enable using the INC/DEC keys and press the
ENT key.
IncDec (Program functions of the INC/DEC keys)
When the calibrator is in the output mode and a valid output function is
active, pressing INC or DEC key will cause the output to change by a
predetermined amount. This amount can be either a percentage of the
Operation 230/235 20
current scale or a user defined calibration point from a predefined list
IncDec Key Funct
CalPts Percent
enter Cal Pts
CE when done
cal point #1
% of scale .00
of calibration points. This feature allows the user to program the
INC/DEC keys to function in one of two modes: user defined calibration
points, or percent of scale. Press the 3 key to program or setup the
INC/DEC key functions. The first menu allows you to select Cal Points
or Percent. The display will prompt with following:
To setup for the cal points function, highlight CalPts and press ENT. To
setup for the Percent function, highlight Percent and press ENT.
Calibration Points
The Calibration Points function allows storage of up to 10 calibration
values. The values are stored as a percent of a user defined scale. First
enter the percentage values, then enter the scale.
The next screen will be an information screen to remind you to enter as
many calibration points as needed (max 10). Press CE when all of the
cal points have been entered.
Press ENT to begin entering new calibration points. Points are entered
as a percent of scale in the range of 0.00% to 150.00%. Press CE when
all of the cal points have been entered.
Enter the new values for each calibration point up to a total of 10
points. If you press ENT without entering a value, the previous value,
as shown, is retained. If you make a keying error, you may press CE to
clear the entry and allow re-entry. When you have entered your final
calibration point press the CE key before entering the next value. After
Operation 230/235 21
the last calibration point is entered, the next screen will be:
Zero point
value ???????
Full scale point
value ???????
Enter the value in engineering units for the function you will be using
that represents the zero value for the calibration points function.
After entering the zero point, the next screen will be:
Enter the value in engineering units for the function you will be using
that represents the full scale value for the calibration points function.
After entering the full scale point, you will return to the overall Setup
menu.
Calibration points examples
Example #1: Programming a 5 point calibration for a thermocouple
transmitter ranged for 100 to 600 degrees. The calibration points
entered would be:
cal point #1 0 (%)
cal point #2 25 (%)
cal point #3 50 (%)
cal point #4 75 (%)
cal point #5 100 (%)
zero point 100 (degrees)
full scale point 600 (degrees)
Operation 230/235 22
Example #2: Programming a 3 point calibration for a 0-10mV input to a
recorder. The calibration points entered would be:
cal point #1 0 (%)
cal point #2 50 (%)
cal point #3 100 (%)
zero point 0 (mvolts)
full scale point 10 (mvolts)
Utilizing Calibration Points
Once calibration points have been enabled in the Setup Menu, they are
activated by simply pressing the INC or DEC key after selecting the
appropriate output function. The INC key steps forward through the
calibration points list, and the DEC key steps backwards. If you attempt
to step beyond the limits, the list will wrap around from the last to first
when incrementing, or the first to last when decrementing. To
automatically step through the selected calibration points, press the
AUTO Key. The steps will continue until the AUTO Key is pressed again.
Percent of Scale
The percent of scale function allows the user to specify a fixed
percentage that the output will change each time the INC or DEC key is
pressed.
Since the temperature scales have various ranges that would be
difficult to remember, the temperature functions are setup to change
by a fixed number of degrees. The range of values for percent are .01%
to 100.00%; the range of values for temperature are .1 degree to
1000.0 degrees.
The top line of the display lists the functions affected by the
increase/decrease value. The second line shows whether the value is a
percent of full scale or degrees. The current value is also shown.
Operation 230/235 23
The first prompt will be for the functions that require a percent of
V, mV, Ohms
percent 10.00
RTD, TC
degrees 100.0
Cold junct. Comp
auto manual
Enter Ref Temp.
In °F + 32.0
scale.
Enter a new value or just press ENT to retain the current value. The
second prompt will be for the functions that require a degree value.
Enter a new value or just press ENT to retain the current value.
CJunct (thermocouple cold/reference junction compensation)
The Model 230/235 calibrator performs automatic cold junction
compensation for both input and output thermocouples. The
automatic cold junction compensation can be disabled if necessary and
a fixed compensation temperature can be entered.
The menu allows you to select either manual or automatic
compensation.
If you select manual and press ENT, you will be prompted to enter the
manual compensation temperature in degrees Fahrenheit.
If you enter 32°F, the calibrator will convert temperature to millivolt
values directly from the standard thermocouple tables. If you select
Auto and press ENT, the Model 230/235 calibrator will use either the
standard internal cold junction compensation, or the optional external
reference junction.
Operation 230/235 24
The internal temperature compensation is performed by a
Note: This module must be used to obtain specified accuracy.
Martel P/N 910200-001
Ref junc sensor
rdg °F + 72.0
semiconductor temperature sensor located next to the thermocouple
output terminals.
The external temperature compensation is performed in a special
external module that connects to the Model 230/235 calibrator’s ECJ
jack on the front panel.
If automatic compensation is selected, the calibrator will display the
current reference junction temperature reading.
Press any key to continue.
The calibrator will automatically use the external module if it is plugged
into the ECJ jack; otherwise, the internal compensation will be used.
The choice between internal or external is largely determined by
environment. The internal sensor is slower to respond to changes in
the ambient temperature. The external sensor, being outside of the
calibrator case, can respond to ambient changes more quickly. Also,
the external sensor can be extended to allow it to be placed in close
proximity to the device being calibrated and to allow connection to
short or inaccessible thermocouple leads.
Owner (Enter owner’s name)
The Model 230/235 calibrator contains a security feature that allows
the owner to enter a name or other identifying number into the
calibrator’s non-volatile memory. The owner’s name cannot be
changed unless the operator knows the unit’s access code. The access
code is unique to each calibrator and is printed on the individual
calibration sheet that is shipped with each calibrator.
Operation 230/235 25
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