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- Page 1 Digital Microhmmeter Type DO7 PLUS Operating Instructions Bracken Hill, South West Industrial Estate, Peterlee, Co. Durham SR8 2SW. England. Tel: +44 (0)191-586 3511 Fax: +44 (0)191-586 0227 www.cropico.co.uk sales@cropico.co.uk...
- Page 2 Digital Microhmmeter Type DO7 PLUS Operating Instructions Limited Warranty & Limitation of Liability CROPICO guarantees this product for a period of 1 year. The period of warranty will be effective at the day of delivery. (c) Copyright 2009 All rights reserved. Nothing from this edition may be multiplied, or made public in any form or manner, either electronically, mechanically, by photocopying, recording, or in any manner, without prior written consent from CROPICO.
- Page 3 Digital Microhmmeter Type DO7 PLUS Operating Instructions Disposal of Old Product This product has been designed and manufactured with high quality materials and components that can be recycled and reused. When the crossed out wheelie bin symbol is attached to a product it means the product is covered by the European Directive 2002/96/EC.
- Page 4 Digital Microhmmeter Type DO7 PLUS Operating Instructions Section 1 – Instrument set-up and operation Table of Contents Page No. 1. Introduction Overview Standard Features of the DO7PLUS Definitions and Terminology Specification 1.4.1 Measurement Accuracy 1.4.2 Temperature Compensation accuracy 1.4.3 Conditions of Use 1.4.4...
- Page 5 Digital Microhmmeter Type DO7 PLUS Operating Instructions 1 INTRODUCTION 1.1 OVERVIEW The DO7PLUS Microhmmeter is a high accuracy instrument designed for industrial and laboratory resistance measurements. Its rugged case and robust construction ensures that accurate and reliable measurements are delivered even under the harshest of environments.
- Page 6 Digital Microhmmeter Type DO7 PLUS Operating Instructions Standard features of the DO7PLUS Microhmmeter include: Graphical and Numerical display of electrical machine cooling curves Automatic temperature compensation Fast reading rate 2 measurements per second Measuring ranges from 6 mOhm to 6 kOhm...
- Page 7 Digital Microhmmeter Type DO7 PLUS Operating Instructions Specification Prior to connecting this instrument always ensure that the circuit under test is electrically isolated. Connecting this instrument to circuits which have not been isolated could lead to a hazard. 1.4.1 Measurement accuracy...
- Page 8 Digital Microhmmeter Type DO7 PLUS Operating Instructions 1.4.8 Weight and Size Size: 358 x 269 x 155 mm (W D H) Weight: 6.0 kg instrument only Weight Packed: 8.5kg...
- Page 9 Only fuses with the rated current, voltage and specified type should be used. Failure to do so may cause an electric shock or fire hazard. Return the instrument to CROPICO for service and repair to ensure the safety features are maintained.
- Page 10 The battery pack can now be lifted out of the case. Place the new battery pack (Cropico part no 551A675) in the case and refit the rear panel screws and sealing washers. Plug the main unit battery leads back into the battery.
- Page 11 Digital Microhmmeter Type DO7 PLUS Operating Instructions 2.5. The Front Panel ON/OFF Switch The On/Off switch switches the DO7PLUS on and off. The last measurement and function setup is restored at power on. Auto switch-off to preserve battery life may be set between 10 and 60 minutes.
- Page 12 Digital Microhmmeter Type DO7 PLUS Operating Instructions MEASURE / STOP Starts and stops the measurement in continuous measurement mode. Triggers measurement in single measurement mode. Navigation and enter Key Moves display cursor and confirms selection. LIMITS Pass / Fail LEDS When limit function is set the green led lights to confirm measurement is within limits.
- Page 13 FAULT LEDS will illuminate. Should this occur the instrument should be taken out service and returned to a Cropico service centre for investigation and rectification. The power supply should not be opened, dismantled or mechanically interfered with.
- Page 14 Digital Microhmmeter Type DO7 PLUS Operating Instructions Measurement Window Displays: Measured value with sign and units. The selected measurement range, current and measurement mode. RX+ and RX- value when in average mode. Compensated value and measured Rx value plus temperature when in temperature compensation mode.
- Page 15 Digital Microhmmeter Type DO7 PLUS Operating Instructions Instrument Set-up Setting the DO7PLUS instrument configuration These are the instrument housekeeping settings and once your preferences are selected and stored they will seldom need to be changed. To select and change a setting proceed as follows:-...
- Page 16 Digital Microhmmeter Type DO7 PLUS Operating Instructions F4 SETUP To enter the configuration menu PRESS F4 (SETUP) the following can then be set. Fig4.2.1 FUNCTION OPTIONS Description Switches backlight OFF Switches Backlight ON BACKLIGHT 10–60 Automatically switches off after 10...60...
- Page 17 Digital Microhmmeter Type DO7 PLUS Operating Instructions Setting the DO7PLUS Measurement Configuration To set or change a measurement configuration PRESS F3 (MENU) and the following screen will display INSTRUMENT MENU RANGE BACKLIGHT CURRENT AVERAGE TRIGGER SING/AUTO LIMITS DATA LOG TEMP COMP...
- Page 18 Digital Microhmmeter Type DO7 PLUS Operating Instructions FUNCTION OPTIONS OPTIONS 2 DESCRIPTION Switches Data Log OFF Switches Data Log ON Displays logged REVIEW measurements DELETE DELETE DATA LOG Deletes all logged values No RDGS Number of readings = Enter number of readings...
- Page 19 Digital Microhmmeter Type DO7 PLUS Operating Instructions FUNCTION OPTIONS OPTION 2 DESCRIPTION Switches cable mode OFF Enter number of cables to be Cables = CABLES measured Series Cables connected in series CONN Parallel Cables connected in parallel LENGTH LENGTH Length =...
- Page 20 Digital Microhmmeter Type DO7 PLUS Operating Instructions Do NOT use Auto-range when measuring inductive devices e.g. motors and transformers. Fig 4.5.1 Measuring ranges with maximum current and resolution Range Measuring Current Resolution 6.0000m 100nΩ 60.000m 1μΩ 600.00m 100mA 10μΩ 6.0000Ω...
- Page 21 Digital Microhmmeter Type DO7 PLUS Operating Instructions ZERO MODE The DO7PLUS uses a four-wire internal zero measurement. The current terminals are internally shorted together and the first measurement made. The potential terminals will measure any emf in the circuit and this value is stored. A second measurement is then performed with the current and potential leads connected in the normal way.
- Page 22 Digital Microhmmeter Type DO7 PLUS Operating Instructions 4.9.3 TRIGGER: Fig. 4.9.1 SINGLE INSTRUMENT MENU CONTINUOUS MEAS SING TRIGGER: AUTO AUTO AUTO The DO7PLUS measurement can be triggered in several ways. Setting Single or Continuous Measurement Mode The DO7PLUS may be set to continuous or single measurement mode.
- Page 23 Digital Microhmmeter Type DO7 PLUS Operating Instructions Remote manual triggering DO7PLUS RS-232 CONNECTION SOCKET Pins numbered as viewed from rear of plug (cable side) PIN 1 ... REMOTE START PIN 5 ...GROUND As an alternative to pressing the MEASURE/STOP key to trigger, a measurement, the remote start facility can be used.
- Page 24 Digital Microhmmeter Type DO7 PLUS Operating Instructions From this menu the LIMITS function may be switched ON or switched OFF. The Maximum (MAX) and Minimum (MIN) limit value may also be selected. To switch the LIMITS ON or OFF with the required option highlighted PRESS OK (F5) to set.
- Page 25 Digital Microhmmeter Type DO7 PLUS Operating Instructions Once set up, and the measurement is started, an immediate measurement is taken, followed by the prescribed number of measurements at the selected timer intervals. The difference between SINGle and CONTinuous measure mode is that in SING, the measuring current is applied only during each measurement, whereas in CONT mode, the current is on all the time, allowing for example, timed measurements of an inductive load.
- Page 26 Digital Microhmmeter Type DO7 PLUS Operating Instructions INSTRUMENT MENU STATS (1 – 29): 4.9971 4.9939 MEAN : 4.9948 0.0032 0.00056 k HINT: STATS will only be calculated and displayed from measurements with the same measuring conditions. E.g. Changing ranges will prohibit the STATS display.
- Page 27 Digital Microhmmeter Type DO7 PLUS Operating Instructions 4.9.8 COOLING CURVE The COOLING CURVE function is a very powerful feature of the DO7PLUS and enables the maximum temperature of a machine, running under full load, to be automatically calculated and displayed in both graphical and table formats.
- Page 28 Digital Microhmmeter Type DO7 PLUS Operating Instructions 4.9.9 TEMPerature COMPensation Temperature compensation is included in the DO7PLUS and should be used when measurements are required to be referenced to a set temperature, normally 20qC. This is particularly useful when measuring materials with a high temperature coefficient such as copper.
- Page 29 Digital Microhmmeter Type DO7 PLUS Operating Instructions Connections for Pt100 sensor Pin numbers as viewed from rear of plug (cable side) PIN 1 ...Screen PIN 2 ...+U PIN 3 ...+I PIN 4 ...-I PIN 5 ...-U PIN 6… NC Pt100...
- Page 30 Digital Microhmmeter Type DO7 PLUS Operating Instructions 4.9.11 SETTLING The settling algorithm is particularly useful when measuring inductive devices such as motors, generators and transformers. With such devices it can take several seconds, and in the more extreme cases minutes, for the ohmmeter measuring current to charge the inductance and provide a steady and stable reading.
- Page 31 Digital Microhmmeter Type DO7 PLUS Operating Instructions 4.9.12 CABLE MODE When the CABLE MODE is selected the DO7PLUS can be used to measure and calculate the length of cables as either an Ohms/Length or a Length value. /LENGTH: No CABLES 1...
- Page 32 Digital Microhmmeter Type DO7 PLUS Operating Instructions The status of the memory store can be displayed by pressing LIST (F5) this will show which memories are free and which are in use. Memories can be cleared by pressing CLEAR (F4).
- Page 33 Digital Microhmmeter Type DO7 PLUS Operating Instructions MEASURING WITH THE DO7PLUS Connecting to the DO7PLUS The DO7PLUS uses a four terminal method of measurement which eliminates errors due to lead resistance. The measuring leads plug into the four front panel safety sockets. The sockets are marked +U, -U, +I, &...
- Page 34 Digital Microhmmeter Type DO7 PLUS Operating Instructions Fig: 5.2.1 Diagram of different connection configurations Connection to Cable Joint Connections to Current Shunt Connections to Stud Terminals Measurement with duplex handspikes...
- Page 35 Digital Microhmmeter Type DO7 PLUS Operating Instructions Resistance measurement The DO7PLUS should be in the measurement [STOP] mode. In this mode the measuring current is switched off and the current terminals are shorted internally. Connect the measuring leads as described in section 5.1 Before starting the measurement select the current mode required as described in section 4.6.
- Page 36 A UKAS calibration certificate is also available and should be ordered with the instrument if required. The calibration should be verified annually and if necessary adjusted. The unit may be returned to CROPICO who offer a full calibration service.
- Page 37 At any time you can move back to a previous range with the << keys or move forward skipping a range with the >> keys. For simple and easy calibration CROPICO offer a calibration standard model MTS2 which has all the standards required in a single switched unit. With the MTS2 true four terminal zero can also be selected.
- Page 38 These update will be available on CD or may be downloaded from our website www.cropico.com. The updates may be uploaded via the USB or RS232 interface and full instructions will be provided.
- Page 39 Digital Microhmmeter Type DO7 PLUS Operating Instructions ACCESSORIES MEASURING LEADS The DO7PLUS may be used with a variety of lead sets. The following are the available selection. Remember, if you do not see suitable leads for your application, please consult our customer help desk.
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Page 40: Table Of Contents
Digital Microhmmeter Type DO7 PLUS Operating Instructions SECTION 2 REMOTE CONTROL INTERFACE DO7PLUS DIGITAL MICROHMMETER USER MANUAL CONTENTS INTRODUCTION ................... 38 SETTING UP THE COMMUNICATION LINK ............. 38 RS-232 SERIAL PORT ................38 USB PORT ..................... 39 FRONT PANEL SET-UP ................39 CONFIGURING THE APPLICATION ............ -
Page 41: Introduction
Digital Microhmmeter Type DO7 PLUS Operating Instructions INTRODUCTION T h e R e m o t e I n t e r f a c e p e r m i t s f u l l r e m o t e c o n t r o l o f t h e D O 7 P L U S b y a n e x t e r n a l c o m p u t e r . -
Page 42: Usb Port
Digital Microhmmeter Type DO7 PLUS Operating Instructions C T S i s a n i n p u t t o t h e m i c r o h m m e t e r a n d c o n t r o l s t h e t r a n s m i s s i o n o f c h a r a c t e r s . I f t h e P C a s s e r t s C T S ( l o w ) t h e n t h e m i c r o h m m e t e r w i l l t r a n s m i t t h e n e x t c h a r a c t e r f r o m t h e o u t p u t b u f f e r ( i f o n e i s w a i t i n g ) . -
Page 43: Configuring The Application
Digital Microhmmeter Type DO7 PLUS Operating Instructions T h i s m o d e i s u s e f u l f o r o p e r a t i o n s s u c h a s s e n d i n g r e s u l t s d i r e c t l y t o a p r i n t e r w i t h o u t t h e n e e d f o r a P C . -
Page 44: Programming The Interface
Digital Microhmmeter Type DO7 PLUS Operating Instructions III. PROGRAMMING THE INTERFACE INTRODUCTION T h e i n t e r f a c e i s p r o g r a m m e d i n a c o m m o n l a n g u a g e w h i c h i s b a s e d o n S C P I ( S t a n d a r d C o m m a n d s f o r P r o g r a m m a b l e I n s t r u m e n t s ) . - Page 45 Digital Microhmmeter Type DO7 PLUS Operating Instructions I f e x t r a , r e d u n d a n t p a r a m e t e r s a r e s e n t i n a p a r a m e t e r l i s t t h e y a r e s i m p l y i g n o r e d .
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Page 46: Remote Interface Commands
Digital Microhmmeter Type DO7 PLUS Operating Instructions I n p u t M e s s a g e T e r m i n a t o r s A l l m e s s a g e s s e n t t o t h e i n s t r u m e n t m u s t t e r m i n a t e w i t h e i t h e r a < l f > c h a r a c t e r o r a <... -
Page 47: Configuration Commands
Digital Microhmmeter Type DO7 PLUS Operating Instructions CONFIGURATION COMMANDS T h e s e c o m m a n d s a l l o w t h e m e a s u r e m e n t c o n f i g u r a t i o n t o b e s e t u p , b u t t h e y d o n o t t r i g g e r a m e a s u r e m e n t . - Page 48 Digital Microhmmeter Type DO7 PLUS Operating Instructions O N ) , t h e n t r i g g e r i n g a m e a s u r e m e n t b y e i t h e r m e t h o d w i l l c a u s e m e a s u r e m e n t s t o s t a r t , a n d t o c o n t i n u e u n t i l o n e o f t h e f o l l o w i n g o c c u r s : x T h e t r i g g e r m o d e i s c h a n g e d t o S i n g l e .
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Page 49: Datalog Commands
Digital Microhmmeter Type DO7 PLUS Operating Instructions T h i s i s t r u e f o r b a s i c o p e r a t i o n , b u t s e e a b o v e i f t h e D a t a l o g D e l a y T i m e r i s i n u s e . -
Page 50: Temperature Compensation Commands
Digital Microhmmeter Type DO7 PLUS Operating Instructions M E M o r y: D A T A : S T A T e < O N | O F F > o r < 1 | 0 > E n a b l e s o r d i s a b l e s t h e D a t a l o g f u n c t i o n . W h e n t u r n e d o n , a l l r e a d i n g s a r e s e n t t o t h e D a t a l o g m e m o r y . -
Page 51: M E Asu Remen T Limit C Omm And
Digital Microhmmeter Type DO7 PLUS Operating Instructions S E N S e : T C O M p e n s a t e : S T A T e ? R e t u r n s “ 0 ” ( O F F ) o r “ 1 ” ( O N ) . -
Page 52: Filter (Rolling Average) Commands
Digital Microhmmeter Type DO7 PLUS Operating Instructions FILTER (ROLLING AVERAGE) COMMANDS T h e s e c o m m a n d s a r e u s e d t o c o n t r o l t h e F i l t e r f u n c t i o n . -
Page 53: Y S T Em R E L At Ed Commands
Digital Microhmmeter Type DO7 PLUS Operating Instructions SYSTEM RELATED COMMANDS S Y S T e m : R E M o t e P l a c e s t h e i n s t r u m e n t i n r e m o t e m o d e ( s e e S e c t i o n B ) . - Page 54 Digital Microhmmeter Type DO7 PLUS Operating Instructions * R S T R e s e t s t h e i n s t r u m e n t t o t h e d e f a u l t R E S E T c o n d i t i o n a s d e s c r i b e d b e l o w , a n d p l a c e s t h e m e a s u r e m e n t i n S t a n d b y m o d e .
- Page 55 Digital Microhmmeter Type DO7 PLUS Operating Instructions APPENDIX I REMOTE COMMAND SUMMARY C o n f i g u r a t i o n C o m m a n d s S E N S e : F R E S i s t a n c e : R A N G e < r a n g e >...
- Page 56 Digital Microhmmeter Type DO7 PLUS Operating Instructions M e a s u r e m e n t L i m i t C o m m a n d s C A L C u l a t e : L I M i t : L O W e r <...
- Page 57 Digital Microhmmeter Type DO7 PLUS Operating Instructions APPENDIX II RS-232 Pin Connections R e m o t e S t a r t ( i n p u t ) R X D R e c e i v e d D a t a...
- Page 58 Digital Microhmmeter Type DO7 PLUS Operating Instructions For Technical Support Contact: Tel: +44 (0) 191 587 8718 For Service and Calibration Contact: Service Department Seaward Group Unit 11 Bracken Hill South West Industrial Estate Peterlee Co Durham SR8 2LS England...
- Page 59 Digital Microhmmeter Type DO7 PLUS Operating Instructions Additional Products From Cropico DIGITAL OHMMETERS RESISTANCE BRIDGES RESISTANCE DECADE BOXES RESISTANCE STANDARDS DIGITAL THERMOMETERS THERMOCOUPLE SIMULATORS PT100 SIMULATORS INSULATION TEST SETS UNIVERSAL CALIBRATORS HIPOT TESTERS ELECTRICAL SAFETY TESTERS Phone, fax or e-mail for further information on the above or for a...
- Page 60 551A550 Rev 3...
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