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.