Transmille 3010, 3041 Operating Manual
3000A Series
Precision Multi Product Calibrator
Operation Manual
Version 5.00: February 2011
All product names are trademarks of their respective companies
3000A SERIES OPERATION MANUAL
IMPORTANT NOTICE
THIS CALIBRATOR
WILL
REQUIRE AN
UNLOCK CODE
AFTER THE EVALUATION
PERIOD HAS EXPIRED.
(60 Days after invoice date)
AFTER THE EVALUATION PERIOD HAS EXPIRED THE
OPERATION OF THE CALIBRATOR IS LOCKED AND THE DISPLAY
SHOWS A NUMBER WHICH MUST BE QUOTED TO TRANSMILLE
TO RECEIVE THE UNLOCK CODE
THE UNLOCK CODE IS AVAILALBLE
FROM TRANSMILLE
ONLY AFTER PAYMENT
HAS BEEN RECEIVED.
This code only needs to be entered once
in the life of the instrument.
Please contact Transmille or use the form in the
back of the manual to obtain the unlock code.
Transmille Ltd.
Staplehurst, Kent.
Tel: 44 (0)1580 890700 Fax: 44(0)1580 890711
Email: sales@transmille.com
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3000A SERIES OPERATION MANUAL
DECLARATION OF CONFORMITY
Manufacturer’s Name: Transmille Ltd.
Manufacturer’s Address: Unit 4, Select Business Centre
Lodge Road
Staplehurst
TN12 0QW
Declares, that the product
Product Name: Multi-product Calibrator
Model Number: 3050A / 3041A / 3010A
Product Options: This declaration covers all options of the above product(s)
Conforms with the following European Directives:
The product herewith complies with the requirements of the Low Voltage
Directive 73/73EEC and the EMC Directive 89/336/EEC (including 93/68/EEC)
and carries the CE Marking accordingly
Conforms with the following product standards:
EMC
EN 61326-1:1997+A1:1998 • EN55011:1991 (Group 1 : Class A)
Standard Limit
IEC 61000-4-2:1995+A1:1998 / EN 61000-4-2:1995 4kV CD, 8kV AD
IEC 61000-4-3:1995 / EN 61000-4-3:1995 3 V/m, 80-1000 MHz
IEC 61000-4-4:1995 / EN 61000-4-4:1995 0.5kV signal lines, 1kV power lines
IEC 61000-4-5:1995 / EN 61000-4-5:1995 0.5kV line-line, 1kV line-ground
IEC 61000-4-6:1996 / EN 61000-4-6:1996 3V, 0.15-80 MHz / cycle, 100%
IEC 61000-4-11:1994 / EN 61000-4-11:1994 Dips: 30% 10ms; 60% 100ms
Interrupt > 95%@5000ms
SAFETY
IEC 61010-1:1990+A1:1992+A2:1995 / EN 61010-1:1993+A2:1995
16/01/2006
Revision No: 1.0 Managing Director
Date: 16/01/2006
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TABLE OF CONTENTS
3000A SERIES CALIBRATOR INTRODUCTION .................................................................................6
MAIN FEATURES ...................................................................................................................................6
ACCURACY AND FUNCTIONALITY............................................................................................................7
TRUE MULTIPRODUCT CALIBRATION FROM ONE INSTRUMENT ...................................................7
RETRO FIT OPTIONS ALLOWS ADDITIONAL FUNCTIONS TO BE ADDED. ...........................7
SERIAL LINE RS232 INTERFACE FITTED AS STANDARD..............................................................8
OUTPUT CONNECTION ..........................................................................................................................8
PREPARING THE CALIBRATOR FOR USE. .......................................................................................9
INITIAL INSPECTION. ..............................................................................................................................9
LIFTING AND CARRYING THE CALIBRATOR ..............................................................................................9
POSITIONING THE CALIBRATOR............................................................................................................10
REAR PANEL CONNECTIONS AND CONTROLS .......................................................................................11
SETTING AND CHECKING THE LINE VOLTAGE. .......................................................................................12
POWER LINE INLET FUSE AND RATING..................................................................................................12
CONNECTING TO A COMPUTER.............................................................................................................13
POWERING UP THE CALIBRATOR ..........................................................................................................13
OUTPUT CONNECTIONS ......................................................................................................................14
OUTPUT OVERLOADS..........................................................................................................................15
OPERATION ........................................................................................................................................16
SAFETY WARNINGS ............................................................................................................................16
INTRODUCTION TO OPERATION ............................................................................................................16
FRONT PANEL CONTROLS AND INDICATORS .........................................................................................17
FRONT PANEL KEYBOARD ...................................................................................................................17
FRONT PANEL KEYBOARD – CONTROL SECTIONS ................................................................................18
GRAPHIC LCD DISPLAY ......................................................................................................................19
DIGITAL CONTROL ..............................................................................................................................20
TERMINAL STATUS LED’S....................................................................................................................21
9 PIN ADAPTER INTERFACE CONNECTOR. ............................................................................................23
SETTING DC VOLTAGE AND CURRENT OUTPUT....................................................................................24
ADJUSTING THE SET OUTPUT USING THE DIGITAL CONTROL ...................................................................25
AUTOMATIC DISPLAY OF % OR PPM ERROR AND REF. KEY ...................................................................26
SETTING AC VOLTAGE AND CURRENT OUTPUT. ...................................................................................27
RETURNING THE CALIBRATOR TO DC ...................................................................................................28
SETTING 2 WIRE RESISTANCE OUTPUT. ..............................................................................................29
SETTING 2 WIRE SIMULATED RESISTANCE (OPTION)............................................................................31
SETTING 4 WIRE RESISTANCE OUTPUT. ..............................................................................................32
SETTING 4 WIRE RESISTANCE OUTPUT. ..............................................................................................32
USING CURRENT COILS (OPTION) .......................................................................................................34
SETTING CAPACITANCE OUTPUT. ........................................................................................................36
SETTING INDUCTANCE OUTPUT (OPTION) ............................................................................................37
THERMOCOUPLE SIMULATION (OPTION)...............................................................................................38
SPECIAL FUNCTIONS AVAILABLE USING THE ‘SOFT’ KEYS ......................................................................43
CONNECTING OUTPUT NEGATIVE TO LINE EARTH (GROUND)..................................................................43
SELECTING FRONT PANEL CONTROL.....................................................................................................43
SETTING TTL LOGIC FREQUENCY OUTPUT. .........................................................................................44
SETTING RPM OUTPUT WITH EA003 ADAPTOR (OPTION) ....................................................................45
SETTING PWM (MARK SPACE RATIO) .................................................................................................46
SELECTING PRT (PT100) RESISTANCE OUTPUT (OPTION) ..................................................................47
SELECTING SIMULATED PRT (RO) OUTPUT (OPTION)..........................................................................48
SELECTING AC POWER CALIBRATION OUTPUT (OPTION)......................................................................50
SELECTING DC POWER CALIBRATION OUTPUT (OPTION) .....................................................................53
SELECTING OSCILLOSCOPE CALIBRATION OUTPUT (OPTION)................................................................54
CALIBRATE .........................................................................................................................................56
SETUP (BEEPER / PASSWORD / ADAPTERS).........................................................................................56
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WARNING AND OUTPUT OVERLOAD INDICATIONS. .................................................................................58
HIGH VOLTAGE TIMEOUT.....................................................................................................................58
30 AMP TEMPERATURE CUT-OUT ........................................................................................................58
INTERFACE TYPES ............................................................................................................................59
RS232 INTERFACE .............................................................................................................................60
USB INTERFACE.................................................................................................................................62
REMOTE PROGRAMMING .................................................................................................................63
PROGRAMMING COMMANDS OVERVIEW ...............................................................................................64
DC VOLTAGE COMMANDS...................................................................................................................66
AC VOLTAGE COMMANDS ...................................................................................................................68
DC CURRENT COMMANDS ..................................................................................................................70
AC CURRENT COMMANDS ..................................................................................................................72
RESISTANCE COMMANDS ....................................................................................................................74
CAPACITANCE COMMANDS ..................................................................................................................76
SIMULATED RESISTANCE COMMANDS (OPTION) ...................................................................................77
SIMULATED CAPACITANCE COMMANDS (OPTION) .................................................................................78
TTL FREQUENCY COMMANDS (OPTION) ..............................................................................................80
PULSE WIDTH MODULATION COMMANDS (OPTION) ..............................................................................82
INDUCTANCE COMMANDS (OPTION) .....................................................................................................84
PRT100 COMMANDS (OPTION)...........................................................................................................86
THERMOCOUPLE SIMULATION COMMANDS (OPTION) ............................................................................88
MISCELLANEOUS COMMANDS..............................................................................................................91
OSCILLOSCOPE CALIBRATION COMMANDS (OPTION) ............................................................................92
AC POWER CALIBRATION COMMANDS (OPTION) ................................................................................101
TECHNICAL DESCRIPTION..................................................................................................................104
GENERAL .........................................................................................................................................104
CONSTRUCTION................................................................................................................................105
INTERNAL FUSES ..............................................................................................................................106
OPENING THE CASE .........................................................................................................................107
ACCESS TO INTERNAL FUSES – TOP PCB..........................................................................................108
ACCESS TO INTERNAL FUSES – FRONT PANEL PCB...........................................................................109
POWER SUPPLY AND OUTPUT SWITCHING BOARD................................................................................110
PROCESSOR BOARD .........................................................................................................................110
MAIN ANALOGUE AMPLIFIER AND FEEDBACK BOARD ............................................................................111
HIGH VOLTAGE AMPLIFIER AND OUTPUT ............................................................................................112
CURRENT TRANSCONDUCTANCE AMPLIFIER.......................................................................................112
OUTPUT CURRENTS SENSING & SHUNTS...........................................................................................113
CALIBRATION TUTORIAL................................................................................................................114
GETTING THE BEST OUT OF THE CALIBRATOR. ....................................................................................114
CALIBRATION AND MAINTENANCE ..............................................................................................116
GENERAL .........................................................................................................................................116
ELECTRICAL SAFETY TESTS ..............................................................................................................116
CLEANING OF THE FAN DUCT ............................................................................................................117
CLEANING THE EXTERNAL CASE .........................................................................................................117
CALIBRATION....................................................................................................................................118
GUARANTEE AND SERVICE.................................................................................................................119
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3000A Series Calibrator Introduction
The 3000A series of calibrators offer the smallest and by far the most portable multi
product multi-function calibrator in the world. The 3000A series calibrator provides a
fully functioned precision programmable calibration source.
Main Features
AC/DC Volts to 1025V
AC/DC Current to 30 Amps (20Amps for 3050A)
AC/DC Current to 1500 Amps with 50 Turn Clamp coil Adapter
2 and 4 Wire Resistance to 1GΩ (10 MΩ for 3050A)
Capacitance
Inductance (Option)
Logic Level Frequency
Mark Space Ratio
PT100 resistance Simulation (Option)
RTD Simulation active (Option)
Thermocouple Simulation (°C & °F)
DDS Power / Harmonics (Internal Option)
250/350/600MHz Oscilloscope Calibration (Internal Option)
RS232 Serial Interface GPIB (IEEE488) Interface Option
Extendable Range Of Adaptors via the Adapter Interface
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Accuracy and Functionality
The 3000A Series calibrators are available in 3 accuracy grades, the 3010A basic
DC accuracy of 5ppm, the 3041A of 25ppm and the 3050A of 50ppm. The
appearance of the instruments is the same however the model type is indicated on
the front and rear panels and also shown on the display at switch on. The
calibrators are also available with reduced functions e.g. DC volts only etc.
True Multiproduct Calibration
From one instrument
Designed to provide an accurate cost effective portable instrument for the calibration
of multimeters, clamp meters, frequency meters, temperature meters, and
capacitance meters. Internal retro fit options allow the calibration of power meters,
oscilloscopes to 600MHz, inductance and LCR meters.
Designed for use in the laboratory or portable onsite calibration.
The 3000A series calibrator is suitable for use in the standards laboratory. The fast
warm up time combined with the small case and low weight make the 3000A series
calibrator also ideal for onsite calibration. The serial interface allows direct
connection to a PC/laptop.
Retro Fit Options
Allows additional functions to be added.
Several internal retro fit options including oscilloscope, power, inductance and PRT
allow the user to select the most cost effective solution for the calibration work with
the ability to add extra functions at a later date. External options for the calibration of
clamp meters, high accuracy thermocouple simulation with auto CJC (cold junction
compensation) built into the TC (thermocouple) connector, optical tachometers,
torque drivers etc. are also available via the front panel adapter interface.
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Serial Line RS232 Interface
Fitted as standard.
All functions and outputs of the series 3000A calibrator are fully programmable over
the RS232 interface. The use of the RS232 interface saves the cost of fitting GPIB
cards to the PC, and also allows easy connection to portable PC’s, reducing the set
up time for on-site calibration.
Output Connection
The output terminal configuration is designed to match the majority of multimeter
input connections, e.g. volts/ohms, low current and high current eliminating the need
for lead changing during calibration. All outputs are isolated when not in use and an
L.E.D. indicator shows the active output(s).
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Preparing The Calibrator For Use.
Initial inspection.
After shipment the calibrator should be inspected for any signs of external damage.
Should external damage be found contact the carrier immediately. Do not connect a
damaged instrument to the line power as this may result in internal damage. Please
retain the original packaging; this should be used when returning the calibrator for
service and recalibration.
Lifting and Carrying the Calibrator
The calibrator weighs 14.5kg with most of the weight at the right rear corner. The
calibrator can be carried by one person supporting the underneath (note: observe all
normal practices for health and safety when carrying). A custom carry case with
shoulder strap is available if the calibrator is to be regularly transported - see options
list. The calibrator should always be placed down on a firm flat surface on its base
feet. Avoid knocking or banging the calibrator and always place down smoothly.
Warning: DO NOT DROP THE CALIBRATOR
This may cause internal damage.
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Positioning the Calibrator.
The calibrator can be used free standing on a bench or mounted in a standard 19”
rack enclosure. The calibrator can be operated at any angle; the two front feet have
tilt legs for bench operation. For all installations care must be taken not to cover the
ventilation slots underneath or block the fan. A 2” (5cm) space behind the instrument
is also required for line and interface connections.
Minimum 2” (5cm) Clearance
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Rear Panel Connections and Controls
Connections on the rear panel are for Line Power via a 3 Pin IEC connector
incorporating the Line fuse and on-off switch; Note the mains inlet is filtered. A 9 Pin
Serial interface connector for the computer interface, this is optically isolated from
the calibrators output. On some models a third connector for the 10kV Extension
amplifier is also present.
Power
Switch
Cooling Fan Vent
(Keep Clear)
RS232 Connector
(COM Port)
Fuse Holder / Line Voltage Selector
Mains / Line Inlet
(IEC) Connector
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Setting and checking the Line Voltage.
Warning: The line power cord must have an earth
conductor to avoid risk of shock.
This instrument must be correctly earthed.
The calibrator has been designed to work from either 100-120 Volt line supply or
200 - 240 Volt line supply. Check that the voltage selector is set at the correct
voltage before connecting the power to the instrument. Connecting the calibrator to
the wrong supply will cause internal damage to the instrument. To change the line
voltage, remove the fuse / voltage selector housing, rotate through 180° and replace
with the required voltage setting at the bottom of the housing indicated by the arrow,
ensure that the correct fuse is fitted. The calibrator is set for 110V operation in the
USA, 230V operation in the UK and Europe.
Power Line Inlet Fuse and rating
The power line inlet fuse is located directly below the power inlet within the voltage
selector housing. The correct fuse rating is 3.15A anti-surge for 230V operation and
5A anti-surge for 110V operation.
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Connecting to a computer
A standard serial 9 pin cable (supplied) should be used to connect the calibrator to a
COM port on the PC. A Null modem cable is not needed.
RS232 Interface
Connection
Configuration
Cable Type Male to Female Serial Cable
Driver N/A
BAUD RATE : 9600
PARITY : NONE
DATA BITS : 8
STOP BITS : 1
Straight Though Pin Connection (Not Null MODEM)
Powering up the calibrator
After connecting line power, the calibrator can be switched on with the line power
switch above the mains inlet socket on the rear panel.
The fan will start and the front panel display will illuminate indicating power. The
display will show a firmware version number and after a short delay, during which
time the processor performs a self-test of the instrument, the display will show an
output of 0.00000mV DC. Allow the calibrator to warm up for 30 minutes to
obtain full accuracy; the fast start feature of the calibrator will give approx. 90% of
full specifications within 10 minutes. The calibrator has been designed to be
powered up continuously, automatically switching to a standby mode after a pre-set
period of time from the last command. In standby mode the display back light will
turn off.
The control program can now be started on the computer, the program will establish
communication with the calibrator at which time the calibrator will download the
values of the internal standards.
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Output Connections
Warning: Risk of shock.
High voltages may be present on the output sockets.
Output sockets are all 4mm safety type, the voltage pair contacts are low thermal
gold plated for minimum thermal EMF.
The 3000A series calibrator’s outputs have been designed to allow most multimeters
to be calibrated without changing connections. There are 3 separate pairs of
outputs:
1) Voltage, Resistance, Capacitance, Frequency & Inductance
2) Current and 4 Wire Resistance
3) High 30A Current.
When an output terminal pair is not active they are completely open circuit and
isolated from the other outputs. As only one pair is active at a time on (except on 4
wire ohms) they may be combined together if required to match the meters input
arrangement.
One example is the configuration of multimeters inputs with a single common low
and inputs with voltage, low and high current. To match this to the calibrator, simply
connect the 3 low outputs of the calibrator together and connect the voltage, low &
high current outputs to the appropriate meters inputs. Note that when outputting
resistance, the calibrator will use the voltage output terminals.
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A second example is where the meter has separate voltage and current inputs, often
using four wire ohms on both pairs. In this case simply connect the voltage and
current outputs to the meter’s inputs, the calibrator will use both the voltage and
current pair on 4 wire ohms.
It is recommended that the voltage and low current leads be high quality screened
cable with gold plated 4mm plugs fitted. The cable must be able to withstand 1025
volts AC and have an insulation resistance greater than 1TΩ to avoid introducing
any shunting effect on the high resistance ranges.
Poor quality test leads will introduce noise, thermal e.m.f. and leakage errors on low
voltage & current ranges and also unstable readings on resistance and capacitance
outputs (see measurement techniques). Special test leads are available from
Transmille, see accessories.
Warning: Under no circumstances should any voltage
be connected to the calibrator outputs
The low output can be connected to line earth or allowed to float as selected - see
operation section of this manual. It is recommended that the low is earthed which
will help to reduce noise on high ohms and low current. If allowed to float with
respect to line earth the low must remain within 50 volts of line earth. Outputs are
optically isolated from the RS232 interface
Output Overloads
If the calibrator is unable to drive the load then the output will be turned off and the
calibrator returned to standby mode. The message Standby will be displayed on
the front panel. The output will be automatically reset on setting the output again.
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Operation
Safety Warnings
WARNING: The information in this section is intended only
for qualified personnel. The user must at all times be
adequately protected from electric shock. Qualified
personnel must ensure that operators of the equipment are
adequately insulated from connection points.
WARNING: This instrument is capable of generating both
DC and AC high voltages.
A soft carry-case and a hard transit case are available for
regular transportation of the calibrator.
Introduction to Operation
All functions of the 3000A Series Calibrator can be controlled from the front panel, or
controlled remotely by a computer over the interface. The front panel controls are
‘locked out’, but local control may be resumed by selecting a soft key - it must be
remembered that this action may disrupt the computer program.
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Front Panel Controls and Indicators
Active
Terminal
LEDs
LCD Display with
integral Backlight
Safety Output
Terminals
Standby Button
Output On Button
Numeric Keypad
Menu buttons
(Soft Keys)
Adapter Interface
Digital Control
Multiplier Keys
Function Keys
Front Panel Keyboard
The front panel of the 3000A Series Calibrator utilises a high quality custom rubber
keyboard with tactile feel buttons and integral display window. The front panel is
therefore sealed against the ingress of moisture and dirt enabling the calibrator to be
used in most working environments without risk of early failure of the operating
buttons. The front panel can easily be wiped clean with a soft cloth. Care should be
taken not scratch the display window. All graphics are ‘under printed’ making them
rugged and durable.
IMPORTANT NOTE
The front panel key buttons are for use with fingers only - do not press
the key with hard or sharp objects e.g. Ball-point pens, pencils,
screwdrivers etc. Repeated actions like this will almost certainly cause
the keyboard to fail. (This will not be covered under warranty). Care
should also be taken when transporting the instrument, do not place
test leads or other objects on top of the panel which may come into
contact with the display area and cause damage.
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Front Panel Keyboard – Control Sections
The Keyboard is divided into sections to allow easy operation.
Numeric section
Allows numeric values to be entered
Multiplier section
Mega (M), kilo (k), milli (m), micro(u) or nano (n)
Function section
Volts (V), Amps(A), Ohms (2 & 4 Wire),
Farads(F), Celsius(C), & Frequency(Hz)
Range Up / Range Down
Allow the output to be multiplied / divided by 10.
Left / Right / Up / Down Arrow Keys
To select the digit to be controlled by the rotary control.
Output On / Standby keys
Allow the calibrators output to be disconnected from the
terminals. LED indicators are incorporated in these switches to
clearly show the output status.
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Graphic LCD Display
The graphic backlit LCD display shows the present output, instrument status, % or
ppm change from the entered value, and also the new value being entered. The
bottom portion of the display is used to assign the function of the four ‘soft (menu)
keys’. The display utilises a back light which automatically turns off if no activity
occurs either from the front panel keys or via a remote command.
Output Value &
Range
Dynamic
Soft key Menu
Lo to
Output On / Standby
Indicators
Deviation (ppm)
Function Specific
Configuration
Display
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Digital Control
A digital potentiometer allows the ‘highlighted digit’ on the display to be incremented
(turning clockwise) or decrement (turning anti-clockwise). As an output is changed
the deviation from the original value entered on the keyboard is shown in either % or
ppm.
Selected digit marker.
Cursor Keys can be used to
move the position of the
digit marker, and increment /
decrement the digit.
Clockwise Rotation
(Increment Digit)
Anti-Clockwise Rotation
(Decrement Digit)
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Terminal status LED’s
LED’s above the terminals indicate which pair is active. When terminals are not
active they are electrically isolated from each other, this enables terminals to be
linked together if required.
Active terminals
indicated by
illuminated LED
Voltage Output Terminal Pair (Black & White)
WARNING:
Dangerous voltage may be present on these terminals.
Low thermal 4mm safety terminals
Used for all voltage outputs up to 1025V, for 2 wire/4 wire resistance, capacitance
and inductance (optional). Note the low ‘black’ terminal can be internally switched to
line earth by a soft key function. When floating, the maximum voltage on this
terminal with respect to ground should not exceed 50 Volts peak.
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Current Output Terminals (Black & Red)
4mm safety terminals for all current outputs up to 2 Amps, TTL frequency and for
sense connection for 4 wire resistance.
Note the low ‘black’ terminal can be internally switched to line earth by a soft key
function. When floating, the maximum voltage on this terminal with respect to
ground should not exceed 50 Volts peak
30 Amps Output Terminals (Blue and Yellow)
4mm Safety terminals used for all currents above 2 Amps.
Earth Terminal (Green)
Connected directly to line earth and case. Incorporates green LED indication of
negative to earth (grounded or floating) selection
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Scope & Freq/Trg BNC Connector Outputs
Isolated BNC sockets for frequency and oscilloscope function outputs. They
incorporate a green LED indicator to show when the terminal is active.
WARNING:
Dangerous voltages up to 400V may be present on these terminals.
9 Pin Adapter Interface Connector.
Used for connection to external pods used for extending calibration capability, e.g.
Thermocouple simulation etc.
Adapter Interface 9 Way ‘D’ type
connector (Female)
Incorporates a green LED to indicate when the adapter interface is active.
The pins connections are as follows:
Pin 1 – +15V
Pin 2 – Digital ground
Pin 3 – Strobe
Pin 4 – Data
Pin 5 – Select
Pin 6 – -15V
Pin 7 – Analogue ground
Pin 8 – Output
Pin 9 – Input
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Setting DC Voltage and Current Output
Complete the following procedure to set a dc voltage or current output.
Use the and (clear) keys to edit the entry.
1) Press
2) Press the numeric and decimal point keys to enter the required value, e.g. 12.345
3) Press the multiplier key (if required), e.g.
4) Press the function key e.g.
5) Press
6) Press to activate the calibrator output.
Key Digits
12.345
Press ‘m’
Multiplier
Press
Function Key
Select
Output On
The calibrator will now produce 12.345 mA D.C. at the appropriate terminals.
Once on a range, any new output within that range can be set without the calibrator
returning to standby. When a high voltage or high current values are entered the
calibrator will automatically go into standby mode. To output the voltage or current,
press the key. This safety feature stops the accidental selection of high
voltage or current.
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Adjusting the set output using the digital control
After the output has been set, any digit of the output display can be incremented or
decremented using either the digital control or the up and down arrow keys. The
digit selected is indicated by the cursor and can be changed by using the left and
right arrow keys.
Highlighted digit
Clockwise Rotation
(Increment Digit)
Anti-Clockwise Rotation
(Decrement Digit)
Up / Down
Cursor Buttons
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Automatic Display of % or ppm Error and Ref. Key
When the output value is changed by the methods above, the display will show the
change in ppm or % from the original reference value entered from the keyboard. If
needed, the reference value can be reset to the present value on the display by the
REF key.
This feature is ideal for displaying the error in a meter under test by adjusting the
output from the calibrator to make the meter read the nominal value.
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Setting AC Voltage and Current Output.
Complete the following procedure to set an ac voltage or current output.
Use the and (clear) keys to edit the entry.
1) Press
2) Press the numeric and decimal point keys to enter the required value, e.g. 16.789
3) Press the multiplier key (if required), e.g.
4) Press the function key e.g.
5) Press
6) Press the numeric and decimal point keys to enter the frequency value, e.g. 1000
7) Press the function key
8) Press to activate the calibrator output.
Select
AC
Key in Voltage /
Current Value
Select
Multiplier
Select
Function
Set Frequency Followed by
Hz Key
Select
Output On
The display will show the frequency in the bottom right hand corner of the display.
For safety, AC/DC changes will maintain the set output value; the output will switch
off and then back on again. The frequency can be adjusted using the digital control.
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Returning the calibrator to DC
Complete the following procedure to return the output to DC:
1: Press
2: Press
Select DC
Key
Press
Enter
The display will indicate DC as shown above. The voltage or current setting will
remain as the previous setting.
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Setting 2 Wire Resistance Output.
Note: The calibrator uses standard resistors of fixed decade values. The nearest
available resistance to the entered value will be automatically selected. Complete
the following procedure to select 100kΩ in 2 wire mode.
1) Press the numeric keys to enter the required value, e.g. 100
2) Press the multiplier key (if required), e.g.
3) Press the function key e.g.
4) Press
5) Press
Key in
Resistance Value
Select
Multiplier
Select
Function
Press
Enter
Select
Output On
The resistance displayed will be the calibrated value held in the non-volatile
calibration memory for that standard. Note the values are different for two and four
wire ohms.
Nulling DMM
The calibrated values displayed for 2 wire ohms are the values present at the
terminals. Therefore the measuring instrument should be zeroed (Nulled) with the
leads shorted before connection to the calibrator.
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2 Wire Ohms Operation
Two wire ohms is output on the voltage terminals as indicated by the terminal LED’s.
2 Wire Ohms Connection
Connect the measuring instrument 2-Wire input to the calibrator
2-Wire resistance output.
Use shielded connection cables – 50 Ohm co-axial recommended
Connect Guard / Earth if required – see notes
Select 2 Wire resistance measurement mode on meter
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