Time Electronics 7000 User manual

User Manual
7000
RTD Calibrator
Version 1.3
11-23
Time Electronics Ltd
Unit 5, TON Business Park, 2-8 Morley Road,
Tonbridge, Kent, TN9 1RA, United Kingdom.
T: [phone] | F: [phone]
[e-mail] | www.timeelectronics.com

© 2023 Time Electronics Ltd.
All rights reserved.
Nothing from this manual may be multiplied, or made public in any form or manner, either
electronically or hard copy, without prior written consent from Time Electronics Ltd.
This also applies to any schematics, drawings and diagrams contained herein.
This manual provides operating and safety instructions for the Time Electronics product.
To ensure correct operation and safety, please follow the instructions in this manual.
Time Electronics reserves the right to change the contents, specifications and other
information contained in this manual without notice.

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Contents
1Introduction....................................................................................................................................4
1.1 Modes of Operation ...............................................................................................................................5
1.2 Technical Specifications ........................................................................................................................6
2Front Panel Controls .....................................................................................................................7
2.1 Main Controls and Display.....................................................................................................................7
2.2 Button Operations..................................................................................................................................8
3Connections...................................................................................................................................9
3.1 2-wire.....................................................................................................................................................9
3.2 3-wire.....................................................................................................................................................9
3.3 4-wire.....................................................................................................................................................9
4Basic Operation ...........................................................................................................................10
4.1 Measurement Mode.............................................................................................................................10
4.2 Source Mode .......................................................................................................................................11
4.3 Manual Step Function.......................................................................................................................... 13
4.4 Ramp Function ....................................................................................................................................14
4.5 Max/Min Log Function .........................................................................................................................15
5Operating Parameters Setup Procedures..................................................................................16
5.1 Element, Zero and Span Setup Procedure..........................................................................................16
5.2 Ramp Rate and Dwell time Setup Procedure ......................................................................................18
6Battery and Re-Charging ............................................................................................................19
7Maintenance and Troubleshooting ............................................................................................20
7.1 Maintenance ........................................................................................................................................ 20
7.2 Troubleshooting...................................................................................................................................20
8Recalibration................................................................................................................................21
9Warranty and Servicing............................................................................................................... 23

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1Introduction
The 7000 is a portable process control test instrument that combines a precision digital
thermometer (using RTD probes) with an RTD/ohms calibrator. Compact and easy to use,
it solves the problem of making high accuracy temperature measurements without using
bulky mains powered instrumentation.
Powered from internal long life rechargeable batteries or an external mains adaptor, it is
equally valuable in laboratory, workshop or the field. It can also be used as an external
temperature reference for dry block and other precision temperature baths.
If used with a certified probe the unit performs as a highly accurate thermometer. Readout
is available in ºC; ºF and ºK.
The 7000 is specifically designed to automate and to speed up the task of calibrating
instrumentation used in the process control industry. Simply enter in engineering units
(ºC, ºF or ºK) the desired zero and span values and the calibrator will automatically calculate
the standard five calibration points (0, 25, 50, 75 and 100%).
The 7000 calibrator is powered by a rechargeable NiMH battery pack. The charger
electronics are contained within the unit enabling the calibrator to be charged from any
12 Volt DC supply.

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1.1 Modes of Operation
1.1.1 Source Monitor mode (4 wire)
Typical functions
• Check RTD probes by measuring their resistance at known temperatures.
• Measure resistance values.
• Indicate temperature when connected to an RTD probe.
• Pre-programmed with a particular RTD’s characteristics for very high accuracy.
Excitation current........................1 mA on all ranges.
Resistance range........................0.01 Ω to 2.6 kΩ.
Resolution...................................0.01 Ω.
Accuracy.....................................See specifications on next page.
Auto re-calibration.......................Every 0.6 secs.
Temperature stability...................Better than 0.0015 % per °C.
Max/Min values............................Logged automatically.
The 7000 may be used with a calibrated and certified probe to produce a highly accurate
thermometer. The performance can be further enhanced by programming the actual
characteristic of the probe into the unit.
1.1.2 Simulator Mode (4 wire)
Typical functions
• Output resistance of precise known value.
• Simulate an RTD value from an RTD table chart.
• Simulate an RTD value using the internal table.
Excitation current..............................0.6 mA to 1 mA.
Resistance range..............................0.01 Ω to 2.6 kΩ.
Resolution.........................................0.01 Ω.
Accuracy...........................................See specifications on next page.
Auto re-calibration............................Every 0.6 secs.
Temperature stability........................Better than 0.0015 % per °C.
Enhanced performance may be achieved by programming the unit to simulate the
characteristic of a particular probe. Five fixed step points (0, 25, 50, 75, 100%) are available
between a user set minimum (0 %) and a maximum (100 %). Programmable ramp function
is also available.

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1.2 Technical Specifications
Standard RTD types (non-standard RTD types user programmable)
Element
Alpha
coefficient
Temp range
°C
Accuracy
°C
Temp range
°F
Accuracy
°F
Pt100 DIN 0.003850
–200 to 250 0.05 –330 to 480 0.10
250 to 849 0.07 480 to 1560 0.14
Pt100 US 0.003916
–100 to 250 0.05 –150 to 480 0.10
250 to 457 0.07 480 to 850 0.14
Pt200 DIN 0.003850 –200 to 300 0.05 –330 to 570 0.10
Pt500 DIN 0.003850
–200 to 250 0.05 –330 to 480 0.10
250 to 630 0.07 480 to 1160 0.14
Pt1000 DIN 0.003850
–200 to 250 0.05 –330 to 480 0.10
250 to 630 0.07 480 to 1160 0.14
Ni 120 0.006180 –100 to 200 0.05 –150 to 390 0.10
Ni 1000 0.006180 –100 to 200 0.05 –150 to 390 0.10
Resistance Accuracy
Range (Ω) Monitor (Ω) Generator (Ω)
20 to 400 0.03 0.03
400 to 800 0.10 0.10
800 to 1200 0.20 0.20
1200 to 2600 0.50 0.50 *
*plus additional error of 0.05 % of output value. If excitation current is less than 1 mA.
1.2.1 General Specifications
Operating temperature .........–10 to 50 °C. Storage temperature –30 to 70 °C.
Operating humidity ...............0 to 90 % non-condensing at 25 °C.
Dimensions/Weight...............H 165 x W 90 x D 45 mm / 0.42 kg.
Power .....................................Internal rechargeable NiMH battery pack. Battery life typically
24 hours. Auto power-down feature. Full recharge from being
exhausted will take approximately 16 hours with the unit
switched off. External mains adaptor (option) can be used.
Optional extras......................7633: Mains adaptor 230 V AC. Optional 110 V AC version.
C183:Traceable calibration certificate (Factory)
C194: Accredited calibration certificate (ISO 17025)

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2Front Panel Controls
2.1 Main Controls and Display
Enter / Exit
Parameter Mode
Select RTD
Sensor type
Min / Max
Reset / Start
Read equivalent Ω value
Ramp Start / Stop / Store
Input / Output Terminals
RTD Type
Mode Indication
Engineering
Units
3 / 4 Wire Selector
Measure / Source
Selector
Input / Output
Reading
3 / 4 wire Selection
Indicator
Increment
% Step Output
Decrement
% Step Output
Power On / Off Switch

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2.2 Button Operations
The 7000 is powered on by a switch on the
side of the unit.
The instrument has dual function buttons
that allow the user to switch between
operations and parameter setups.
Normal operating mode is the source and
measure usage of the unit.
Parameter mode is the setup mode.
Enter/Exit Parameter Mode
The Esc key enables the user to move from Normal operating mode to the Parameter set-up
mode. The Parameter Set-up Mode is used to change stored operating parameters.
•Sensor element value
•0% and 100% Source Output values
•Ramp rate and Ramp Dwell period
Engineering Units and Digit Select
The engineering units key enables the user to select the units of measurement or generation.
In parameter mode this key is used to select the digit of the parameter value that is to be
changed. This function operates in a wraparound fashion so that the cursor will return to the
first digit if continuously operated.
RTD Sensor Type and Increment Digit
The sensor key allows the user to select the required Alpha and RTD element.
8 programmable elements and three factory set Alpha co-efficient values are included.
In Parameter Mode this button is used to increment the digit selected by the
“Engineering Units” key.
Max/Min
In Measure Mode this key initialises the Max/Min function setting the starting values to the
current measured value. Press Max/Min again, RTD or CFKΩ, the 7000 unit will disengage
the Max/Min function.
Ramp
In Source Mode this key starts and stops the ramp function.
In Parameter Mode this key is used to accept and store the programmed value.
Increment and Decrement
In Source Mode these keys are used to increment and decrement the stepped output from
0% to 100% in five steps.
In Parameter Mode these keys allow the user to select the parameter to change

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3Connections
An RTD (Resistance Thermometer Device) temperature measurement relies on the fact that
the probe, in a repeatable manner, predictably changes its resistance for changes in
temperature. Connecting lead resistance will influence the reading. In a process installation
where the probe is situated some distance from the measuring instrument the lead
resistance may introduce significant reading errors. For a particular process applications the
temperature measuring instrument is selected based on the required range, resolution and
accuracy. This in turn influences the choice of probe and type of connection. There are three
commonly used wiring connection arrangements (2, 3 and 4 wire).
The 7000 is designed to operate with all three wiring
configurations. The top side button is used to select the
appropriate connection type.
3.1 2-wire
This is the least accurate as the resistance in the length of the
two uncompensated transmission wires will affect the sensor
reading. Therefore, this type of connection is not normally
recommended. To connect in this mode, select 3-wire
and add external links between the black and blue
terminals and brown and red terminals. Keep the
connection as short as is practical.
3.2 3-wire
Process instruments using 3-wire connections arrange input
circuitry in such a way as to compensate for lead resistance
changes. The transmission leads should be of equal
length and as short as possible.
3.3 4-wire
The 4- wire connection provides the most accurate
measurement. The leads are compensated for, so can be
any convenient length. To connect in this mode select
4-wire and connect as shown.

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4Basic Operation
4.1 Measurement Mode
In the measure mode the 7000 is able to give a temperature read out in ºC, ºF and ºK from a
variety of standard RTD probes.
•Establish the process instrument probe type input requirement
(e.g. Pt100 DIN alpha coeff. 0.003850)
•Establish the required engineering units and temperature range (e.g. –100 to 150°C).
•Check that the probe type and range are compatible, ie within the specification range
–200 to 250 ºC (refer to the specifications section).
•Establish the required input wiring connection type (3 or 4 wire)
•Set the 3/4 wire select button ‘A’ to the required connection.
oIN position for 3-wire
oOUT position for 4-wire
•Connect the calibrator to the process instrument.
See the wiring connections on previous page.
•Turn on the calibrator via the side switch.
•Select the engineering units by repeatedly pressing until the required
units are displayed.
•Select the type of RTD by repeatedly pressing until the desired
RTD is displayed (e.g. Pt 100 DIN a3.850).
•Select measure mode by releasing selector button
‘B’ to the OUT position.
The calibrator will display the reading from the RTD probe in the selected engineering units.
Error messages
If the display shows over range ^^^.^^:
• Incorrect RTD type selected.
• Incorrect wiring 2, 3 or 4 wire.
• Sensor probe open circuit.
• Measured temperature is outside of the range.

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4.2 Source Mode
An RTD (Resistance Temperature Detector) probe resistance varies with temperature.
The resistance for a given temperature is different depending on the type of probe.
For process applications the type of probe and instrument is selected based on the required
temperature range and resolution. In the Source Mode the 7000 unit can simulate the most
commonly used probes to facilitate the calibration of RTD type input process instruments.
•Establish the process instrument probe type input requirement
(e.g. Pt100 DIN alpha coeff. 0.003850)
•Establish the required engineering units and temperature range (e.g. –100 to 150°C).
•Check that the probe type and range are compatible, ie within the specification range
–200 to 250 ºC (refer to the specification section).
•Establish the required input wiring connection type (3 or 4 wire)
•Set the 3/4 wire select button ‘A’ to the required connection.
oIN position for 3-wire
oOUT position for 4-wire
•Connect the calibrator to the process instrument.
See the wiring connections on previous page.
•Turn on the calibrator via the side switch.
•Select the engineering units by repeatedly pressing until the required
units are displayed.
•Select the type of RTD by repeatedly pressing until the desired
RTD is displayed (e.g. Pt 100 DIN a3.850).
•Select measure mode by releasing selector button
‘B’ to the IN position.
•Determine the current Zero and Span settings by repeatedly pressing
The lower part of the display will show the 0, 25, 50 ,75 and 100% calibration points and
their corresponding temperature values.

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•To change the Zero & Span refer to Setup procedure Section 5.1.
•To calibrate using the Manual Step Function refer to Section 4.3.
•To calibrate using the Ramp Function refer to Section 4.4.
Error messages
The display shows over range ^^^.^^ or Output unable to settle:
•Incorrect wiring. Check polarity.
•Excitation current from the circuit under test is too high or low. Range is 600µA to
1mA depending on the probe type.
•Circuit under test is multiplexed.

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4.3 Manual Step Function
In the source mode a single key press will step the output though the five calibration points.
This considerably speeds up the calibration process as it removes the time consuming and
tedious process of having to manually adjust for each calibration point.
The following assumes that the calibrator has already been set up for the correct connection,
source mode, RTD type and range as described in Source mode (Section 4.2)
•Ensure that the calibrator is set for Step Function. The display should
now show a step symbol in the bottom section.
•If it does not, select the step function by pressing which toggles the
Step and Ramp functions.
•The display should now indicate the step
symbol.
•To step through the % calibration points press either:
To increase the output
To decrease the output
•To read the equivalent ohms value press

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4.4 Ramp Function
In Source Mode the calibrator unit may be set to ramp from zero (0%) to span (100%)
dwelling for a time period at the top and bottom limits.
The following assumes that the calibrator has already been set up for the correct connection,
source mode, RTD type and range as described in Source mode (Section 4.2)
•Ensure that the calibrator is set for Ramp Function. The display should
now show a ramp symbol in the bottom section.
•If not, press Ramp until the display shows the ramp symbol and start
to ramp.
•The output will ramp continuously from
zero to span and back to zero dwelling at
the limits.
•To reverse ramp direction, press either Increment or
Decrement buttons.
•If the button is pressed again twice the ramp will return to the ramp start, i.e. if
ramping up it will return to 0% and if ramping down it will return to 100%.
oTo restart the ramp up from 0% press
oTo restart the ramp from 100% press
The Dwell period T1 (seconds) and Ramp rate Ω/S (ohms/second) are programmable.
To change them follow the Ramp rate and Dwell time Set-up Procedure Section 5.2.
•To re-enter the Manual Step Function press

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4.5 Max/Min Log Function
In Measure Mode the calibrator is able to log the measured maximum and minimum values.
The following assumes that the calibrator has already been set up for the correct connection,
measure mode, RTD type and range as described in Measure Mode Section 3.1.
•To enter the Max/Min function press
•The minimuminput value will be recorded and displayed in the lower left-hand
corner of the display.
•The maximuminput value will be recorded and displayed in the lower right-hand
corner of the display.
•The maximum and minimum values will be updated if a new high or low is reach
during the session.
•To exit the Max/Min function and clear the stored values press

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5Operating Parameters Setup Procedures
5.1 Element, Zero and Span Setup Procedure
Normal calibration is carried out at five standard points. To set the 5 calibration points it is
only necessary to set the zero (0%) and span (100%) limits. The calibrator will calculate the
intermediate values (25, 50, and 75%)
•Select Source by pressing ‘B’ button IN.
•Access the Parameter mode functions to set the required zero and span
limits by pressing the ESC button.
5.1.1 Setting Zero and Span limits
The display will show the current zero (%) limit in the top section of the display with the
cursor under the +/- sign.
•To change the zero value, move the display cursor
under the digits to be changed by pressing.
•To change the digits repeatedly pressing
•To store the new values press
•Select the span (100%) limit by repeatedly pressing
until the display shows the current span (100%) limit.
The cursor will be positioned under the +/- sign.
•To change the span value, move the
cursor under the digits to be changed by pressing
•To change the digits repeatedly pressing
•To store the new values press
•To exit the parameter function, press the ESC button

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5.1.2 Element Set-up Procedure
•Select Measure by releasing button ‘B’ to the OUT position
•Select the correct Alpha curve, repeatedly pressing
•Access the Parameter mode functions to set the RTD element value press
•The display will now show the current RTD
and Alpha values, with the cursor under the
+ symbol.
•To change the element value, move the display
cursor under the digit to be changed by pressing
•To change the digits repeatedly pressing
•To store the new values values and exit setup press
The calibrator is now set for the correct RTD type and range to calibrate the process
instrument for the five standard calibration points (0. 25, 50, 75 and 100%).

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5.2 Ramp Rate and Dwell time Setup Procedure
In the Source mode the calibrator unit may be set to ramp from zero (0%) to span (100%)
dwelling for a time period at the limits. The Ramp rate (Ω/Sec) and Dwell period (secs) are
programmable.
5.2.1 Changing the Ramp rate
•Enter the Parameter mode by pressing
•Then repeatedly press
until the display shows Ω/S
•Move the cursor under the digits to be changed by pressing
•To change the digit repeatedly press
•To store the Ramp rate value press
5.2.2 Changing the Dwell period
•Repeatedly press
until the display shows T1.
•Repeat steps 3 to 5 above to enter and store the new value.

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6Battery and Re-Charging
The 7000 is powered by a rechargeable NiMH battery pack that gives approximately 24
hours operation.
To facilitate recharging of the internal batteries, the 7000 calibrator incorporates a low
voltage re-charger, this means that as well as the provided mains charger, any 12V DC
power source may be used, including a fuse (250mA) protected car battery.
Time for full battery charge:
•Calibrator switched off = 16 hours.
•Calibrator switched on = 21 hours.
Battery charger connector polarity
Spare battery packs can be obtained from Time Electronics Ltd. Part #:7629

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7Maintenance and Troubleshooting
7.1 Maintenance
Front Panel Keypad and Connections
The front panel should be cleaned by wiping with a damp cloth.
Solvents must not be used to clean the panel as damage may result.
Display
The LCD display should not be exposed to strong sunlight for prolonged periods.
Usage and Storage
Temperature
The operating and storage temperature limits for the calibrator are -30 to 70 ºC (-22 to 158 ºF).
Humidity
The operating and storage relative humidity limits for the calibrator are 10 to 90 %
non-condensing at 25 ºC (77ºF).
7.2 Troubleshooting
Error messages may appear depending on the usage and setup of the unit and application.
Measure - Error messages
The display shows over range ^^^.^^
•Incorrect RTD type selected.
•Incorrect wiring 2, 3 or 4 wire.
•Sensor probe open circuit.
•Measured temperature is outside of the range.
Source– Error messages
The display shows over range ^^^.^^ or Output unable to settle
•Incorrect wiring. Check polarity.
•Excitation current from the circuit under test is too high or low.
Range is 600 µA to 1 mA dependant on the probe type.
•Circuit under test is multiplexed.