Time Electronics 7085A User manual

User Manual
7085A
Temperature Distribution and
10 Channel Scanner Module
Version 1.1
March 2021
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

© 2021 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 General Description...............................................................................................................................4
1.2 Specifications ........................................................................................................................................5
2Operation........................................................................................................................................6
2.1 Operational Guidelines ..........................................................................................................................6
2.2 Using Time Electronics Dry Block Calibrators .......................................................................................6
2.3 Thermocouple and RTD Connection .....................................................................................................7
2.4 Cold Junction Compensation (CJC) ......................................................................................................8
2.5 Connection to 7051 or 8060 Modules.................................................................................................... 9
2.6 Using EasyCal Software with the 7085A ............................................................................................. 10
3Additional Applications......................................................................................................17
3.1 Temperature Transmitters ................................................................................................................... 17
3.2 Thermocouple Simulation (7051 Module only) .................................................................................... 18
3.3 Custom Applications Using the 7085A ................................................................................................19
4Warranty and Servicing............................................................................................................... 20

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1Introduction
1.1 General Description
The 7085A is a temperature distribution module that allows users to quickly create multi-
channel measurement applications. It is designed to switch 8 thermocouple inputs and 1
RTD reference to a common output. The module interfaces with EasyCal software and the
10 channel scanner in the multimeter section of the 7051+, 8060+, or 5065B modules.
The 7085A supports multifunction measurements including resistance, AC/DC voltage and
current, thermocouple and RTD. For temperature measurements the cold junction
compensation is equipped to improve accuracy and is shown via an LCD display on the
module, and factored by EasyCal software via internal communication during applications.
The module provides a convenient method of temperature UUT connection and calibration.
To automate the process, EasyCal software controls the dry block calibrator (see TE range)
and captures readback via the CalBench control centre (with integral multimeter) for
automated testing. This method means that a typically time consuming temperature
calibration application can be performed without relying on the user to manually step through
the temperature ranges. The multiple input connections aid the workload further by allowing
up to 8 thermocouples to be tested at one time. The 7085A is an excellent solution that
saves both time and resources by automation and batch testing capabilities.

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1.2 Specifications
Requirements
The 7085A interfaces with 7051, 8060, 8051 and 5065B modules. For
automation EasyCal software is required on a control centre module or
separate PC.
Thermocouple Input
Connections
8 x inputs, connections via standard & miniature TC type, or 4 mm
shrouded sockets
Reference RTD Input
Connection
1 x RTD input, connections via 3 wire RTD type, bare wire screw
terminals, or 4 pin multiway connector
Reference
Thermocouple
A reference thermocouple can be used by connecting to input #8 on the
module
Internal Connections Integral to the CalBench console for communication with compatible
modules
Maximum AC Voltage 125 V rms or 175 V peak, 100 kHz, 1 A switched, 62.5 VA (resistive load)
Maximum DC Voltage 110 V, 1 A switched, 30 VA (resistive load)
Actuation Time 5 ms maximum on/off
Contact Potential < ±500 nV typical per contact, 1 μV max / < ±500 nV typical per contact
pair, 1 μV max
Isolation between
any two terminals > 10 Gohm, < 75 pF
EasyCal Compatible
Dry Block Calibrators
For full automation a TE dry block calibrator can be driven by EasyCal
software. Models supported include: 8070, 8071, 8072, 7860, 7862,
7870, 7872, 7880, 7882.
See separate data sheets for information and specifications
Module Width 250 mm (primary or secondary console fitting)

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2Operation
2.1 Operational Guidelines
The 7085A is designed to be used with the 7051 module or the 8060 Module that features
the AVM65 option (standard with 8060+ version). Note the 7085A interfaces with the integral
multimeter section of both modules.
The purpose of the 7085A is to enable users to automate temperature calibration
applications. For full usability a compatible Time Electronics Dry Block Calibrator and
EasyCal Software must be used.
Note: The 7085A cannot be used with the standard measure function of the 8060. It must be connected and
operated via the AVM65 measure section and EasyCal software.
2.2 Using Time Electronics Dry Block Calibrators
The Time Electronics range of dry block calibrators can be driven by EasyCal software to
automate testing procedures. Standard models feature a USB port that can be connected to
the CalBench control centre via the under section of the primary console. Some legacy model
dry block calibrators feature RS-232 communication, this is also connected under the console.
When a CalBench is ordered with a compatible dry block calibrator and module with
EasyCal, the software drivers are included as standard.
Note: Some dry block calibrators have comms
ports on the side of the unit.

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2.3 Thermocouple and RTD Connection
Inputs to the 7085A are via 4mm terminals, thermocouple connectors, RTD probe connector,
3 wire RTD Connector or 4 wire terminal block.
Thermocouple channels 1 to 8 are shared with the 4mm terminals 1 to 8. The RTD input
channels are shared with channels 9 and 10. 4 wire input connection is only available on
channels 9 & 10 and the RTD terminal block.
The 7085A can be used with a reference probe (see Time Electronics TERS range).
Thermocouples
Reference
RTD
Connect to TC channels
RTD Input
Section
Dry Block Calibrator
EasyCal Software Compatible

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2.4 Cold Junction Compensation (CJC)
The 7085A has a temperature display on the module. EasyCal software automatically reads
the CJC from the 7085A in the testing application.
When using a 7051 module the 7085A can be manually configured for operation.
A simple user interface displays the CJC reading from the 7085A module.

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2.5 Connection to 7051 or 8060 Modules
2.5.1 7051 Module
2.5.2 8060 Module (requires AVM65 option to be fitted)

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2.6 Using EasyCal Software with the 7085A
2.6.1 Principal of operation
The dry block calibrator is automatically set to test points created, allowing time for the
temperature to stabilise. The 7085A automatically switches between probes under test, plus
reference probe if used, and the readings captured by the 7051 / 8060 AVM DMM modes.
2.6.2 Creating a Procedure
When creating a new procedure, select the ‘Thermocouple Sensor’ device type. This
preconfigures the column headers with default settings and enables the procedure wizard
feature.
Using the procedure wizard a sequence of tests is created using the parameters entered.

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2.6.2.1 Input
The input parameters apply to the dry calibrator and external reference probe is if used.
The input range is set to the minimum and maximum test points required.
Note: When entering the input range, the values are duplicated to the output range to aid the user.
Calibration Instrument - Dry Block Calibrator Only
In this case the master reading is taken from the dry block’s internal reference. Select the
dry block from the Input calibrating instrument list.
Calibration Instrument - Dry Block Calibrator + Reference Probe
In this case an external reference probe is used as the master reading. The 7051 DMM/
8060 AVM is used to measure the reading from the reference probe. Select the DMM + Dry
Block from the Input calibrating instrument list.
If the reference probe is a thermocouple the type and CJC reference options are made
available. Channel 1 is used for the thermocouple reference probe.
Wait For Stable
To achieve a high precision of measurement it is necessary to allow the dry block to stabilise.
EasyCal can be setup to wait until the temperature is stable before taking any further
measurements.
To use the dry block’s internal temperature stability feature (recommended) select ‘Use Jofra’.
This method takes between three and five minutes for stabilisation.
Alternatively EasyCal can monitor the readings and allow the tests to proceed after a number
of tests are with a set percentage of each other. The default settings for this type of stabilisation
are 10 readings within 1 percent of each other. These parameters can be modified in each
test if required.
Setting Band
To ensure the test point is near the mean value required, a setting band for the input
temperature is set. A test will not proceed unless the value is within the setting band.

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2.6.2.2 Output
This is the unit under test. The output range is usually the equal to the input range. The
Calibrating Instrument is the DMM used to measure the output of the thermocouple or other
type of temperature sensor.
CJC & Thermocouple Type
For thermocouple sensors the CJC reference and thermocouple type options are available. In
most cases the CJC reference is set to 7085.
Use Scanner
Tick this option to utilise the automatic switching capabilities of the 7085A
2.6.2.3 Details
Number of devices under test
This determines the number of channels which will be used. A maximum of 8 thermocouples
can be calibrated using the 7085A.
Number of test points
The range is divided by the number of test points.
Method
For temperature sensors this is usually up. The procedure wizard will create test points from
0 to 100% of the range entered.

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2.6.2.4 Test Details
From the wizard a sequence of tests is created. Normally this is all that is necessary, but
each test can be individually edited if required.
The example above shows a series of tests using a reference pt100 probe to calibrate 5
thermocouples from 25 to 125 °C.
The procedure is created using a ‘Reference Reading’ for each test point. Each UUT reading
is then compared against the reference reading test using the auxiliary reading function.
Within the auxiliary reading function the input method is set to use ‘Result from previous test’
and the test number option is selected. This is the test result to compare against.
Note: If any tests are deleted or added the ‘result from previous test’ will be out of sequence. In this case the test
numbers must be amended manually.

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2.6.3 Calibration Run (CalRun)
The first test sets the dry block to the required temperature. CalRun displays the readings
from the internal dry block reference or external reference probe as the temperature reaches
the set point. Once the temperature is stable and is within the setting band, the reference
temperature is recorded.
The example above shows a reference test using an external probe. The value shown in the
main reading display (25.080°C) is the value of the reference probe measured by the DMM.
Although it states ‘U.U.T reading (°C)’ the measurement is the reference probe. The setting
band is ±0.5°C. The dry block temperature (25.120°C) is shown in the auxiliary reading
display. Time to stability (5 minutes) is also shown in this section.
Note: When using an external reference probe the setting band for the dry block calibrator is set to ten times the
value of the reference probe setting band. This allows the external reference probe to control the accuracy of the
set point.

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CalRun automatically steps through each of the sensors under test for the given test point
recording the values.
In the example above thermocouple under test sensor reading (26.1°C) is shown in the main
reading display. The limits are ±2 °C. This is compared against the reference result of test 1
(25.080°C). The cold junction value (23.4°C) as measured by the 7085A is also displayed.
Once the tests are completed for the first test point CalRun will set the dry block to the next
test point required and the sequence is repeated.

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2.6.4 Example Calibration Certificate
2.6.5 Traceability of an External Reference Probe
By default the external reference probe will not appear in the traceability section of the
calibration certificate. Two methods are available to resolve this.
a) Using the ‘Edit Traceability’ feature in PrintCert allows the standard to be added after
a calibration is performed.
b) Adding a non-printing test to the procedure which specifies the reference probe as a
calibrating instrument.
In either case the reference probe(s) must be added, as a standard, to the calibrating
instruments list in EasyEdit > System Setup > Calibrating Instruments.
For further information please consult the EasyCal user manual.

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3 Additional Applications
3.1 Temperature Transmitters
The same principals, as described in the previous chapter, can be applied temperature
transmitters with integral probes.

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3.2 Thermocouple Simulation (7051 Module only)
When using a 7051 to source simulated thermocouples the 7085A provides a suitable 4mm
to thermocouple interconnection along with an improved cold junction reference.
Connections
Each 7085A thermocouple socket is connected in parallel
with each red and black 4mm terminal. Connect the 7051
source main terminals to the 4mm sockets and, using a
thermocouple compensating lead, connect the
thermocouple socket to the UUT.
The 7085 is not required to perform any switching as there is a direct connection between
the 7051 & 7085A.
7051 Source App
Select thermocouple from the
7051 source application.
From here select the 7085A as
the CJ reference.
EasyCal
This selection is also used in EasyCal for any thermocouple source tests performed by the
7051. If a manual CJ reference is entered this value will also be used.

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3.3 Custom Applications Using the 7085A
The 7085A is primarily utilised in temperature calibration on the CalBench.
Because it is a 10 channel scanner the module can also be used for additional applications
that require multi-channel measurements. For specific applications please consult Time
Electronics for prior to purchase to ensure application coverage.
The diagram below shows a configuration for batch testing pressure transducers using an
automatic pressure controller in conjunction with a 7085A.

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4Warranty and Servicing
Warranty
The Time Electronics products carry a one-year manufacturer’s warranty as standard.
Time Electronics products are designed and manufactured to the highest standards and
specifications to assure the quality and performance required by all sectors of industry.
Time Electronics products are fully guaranteed against faulty materials and workmanship.
Should this product be found to be defective, please contact us using the below details.
Inform us of the product type, serial number, and details of any fault and/or the service
required. Please retain the supplier invoice as proof of purchase.
This warranty does not apply to defects resulting from action of the user such as misuse,
operation outside of specification, improper maintenance or repair, or unauthorized
modification. Time Electronics’ total liability is limited to repair or replacement of the product.
Note that if Time Electronics determine that the fault on a returned product has been caused
by the user, we will contact the customer before proceeding with any repair.
Calibration and Repair Services
Time Electronics offers repair and calibration services for all the products we make and sell.
Routine maintenance by the manufacturer ensures optimal performance and condition of the
product. Periodic traceable or accredited calibration is available.
Contacting Time Electronics
Online:
Please visit www.timeelectronics.com and select Support Request from the Contact links.
From this page you will be able to send information to the Time Electronics service team
who will help and support you.
By phone:
[phone]
By email:
[email protected]