Time Electronics 1018 Manuel utilisateur

1018

Multi Function

V I R DC Calibrator

Time Electronics Limited

Botany Industrial Estate, Tonbridge, Kent, TN9 1RH

Tel: +44(0) 1732 355993 Fax: +44(0)1732 770312

Email: [email protected]

Web Site: www.timeelectronics.co.uk

V6 17/12/03

Technical Manual

Page 2

Contents

Section Page

1. Introduction 3

2. Specifications 4

3. Circuit and Power Supply Description 5

4. Front Panel Controls 6

5. Operation 7

6. Calibration 8

7. Guarantee & Service 11

All Time Electronics’ instruments are subject to continuous development and

improvement and in consequence may incorporate minor detail changes from

the information contained herein.

Page 3

1. Introduction

A high performance portable D.C. calibrator with a null measuring capability. It is suitable for use

in the field or laboratory for calibrating and testing a wide range of transducers e.g. thermo-

couples, 4-20mA and 0-10V transmitters, and PRTs. The 1018 has the following features,

Ranges

5 DC voltage ranges from 10mV to 100V each with a 6 digit (1ppm) resolution. 1 DC current

range 100mA with a 100nA (1ppm) resolution. Resistance from 0.01ohm to 10Kohm is available

in 0.01ohm steps.

Power

Either mains or re-chargeable battery. Battery operation enables good performance where earth

loop and noise pick-up occurs.

Stability v Temperature and Time

Outstanding performance is due to the use of special computer selected reference diodes and the

latest in resistor technology. The special low-thermal emf terminals reduce errors when working

with micro-volt signals.

Digital Deviation Control

Allows the output to be increased or decreased in % terms from 0 to +/-0.999%. This can be

used to provide a direct read-out of error against a nominal value e.g. 1.80000V with a +0.030

deviation would indicated a 0.03% error. This simplifies the recording of results for calibration

certificates and immediately shows if the unit being calibrated is within specification.

Null Measure

This function enables the 1018 to be used as a high performance differential voltmeter to resolve

differences as small as 1 micro-volt. An edgewise meter on the front panel indicates the null

signal(difference), and zero and sensitivity adjust controls are provided for adjustment. A rear

panel output of the null voltage signal is provided for driving chart recorders or data loggers. It is

suitable long term analysis and stability checking work. Pre-setting the sensitivity control provides

a known null sensitivity e.g. 10 ppm/div on a chart recorder.

♦ D.C. Volts 100 nV to 100 V

♦ D.C. Current 100 nA to 100 mA

♦ Resistance 10 milliohm to 10 Kohm

♦ 0.005% (50ppm) accuracy

♦ 1 ppm setting resolution

♦ Stability <5ppm/day, <25ppm/yr

♦ Noise < 1ppm (0.1 to 1 Hz)

♦ Deviation 0 to +/- 0.999%

♦ Null Indicator 1 uV resolution at max sensitivity

♦ Null Readout 0 to +/- 1V fsd

♦ Zero and Sensitivity Controls

♦ Mains/Battery operation

♦ Portable 29 x 11 x 25 cm 2.4 Kg

Page 4

Voltage Ranges/Accuracy 0 - 9.99999mV in 10nV steps, ± 0.02% of setting ± 0.005% of range

0 - 99.9999mV in 100nV steps, ± 0.01% of setting ± 0.004% of range

0 - 999.999mV in 1µV steps, ± 0.005% of setting ± 0.002% of range

0 - 9.99999V in 10µV steps, ± 0.005% of setting ± 0.002% of range

0 - 99.9999V in 100µV steps, ± 0.01% of setting ± 0.004% of range

The above accuracies are independent of thermal emfs which can be

up to 3uV depending on the type of leads and connections used. This should

be allowed for in the expected accuracy.

Output resistance: 10mV & 100mV: 10R. 1V & 10V: <300mR. 100V: <2R

Drive current max: 10&100mV: as 10R o/p res. 1V&10V: 0.15A. 100V: 10mA.

Short circuit current: 350mA limited

Current Range/Accuracy 0 - 99.9999mA in 0.1uA steps, ± 0.02% of setting + ± 0.004% of range

Drive voltage max: 10V

Resistance Range/ 0 - 9.99999kR in 0.01R steps, ± 0.05% of full scale

Accuracy Power rating : 0.25W per resistor

End resistance : less than 250 milliohms

Deviation Control 0% to 0.999% in 0.001% steps; Deviation accuracy: V&I output, 0.5%

Temperature Coefficient <5 ppm per degC

Long Term Stability <5ppm/day <15ppm/90day, <25ppm/year

Short Term Stability/Noise 10mV range: <0.2uV/sec, <0.3uV/10sec, <0.4uV/min

100mV range: <0.2uV/sec, <0.4uV/10sec, <0.6uV/min

1V range: <0.2uV/sec, <0.5uV/10sec, <1uV/min

10V range: <1uV/sec, <2.0uV/10sec, < 5uV/min

100V range: <40uV/sec, <100uV/10sec, <500uV/min

100mA range: <0.2uA/sec, <0.3uA/10sec, <0.5uA/min

Warmup and Settling time <10 minutes to full accuracy. Settling: < 0.5sec, 100V range, 3sec max

Output Connections The output is via 4mm low thermal emf shrouded sockets (0.2uV/degC).

A mains earth socket is provided for screening purposes. A three position

output switch allows the output to be reversed or disconnected as required.

A rear panel connector is provided for the null amplifier output, 0 to +/-200mV

representing the indicator full scale.

Null Measure Sensitivity: Max 1uV. Min 200mV fsd. Input R:>1Mohm. Rem o/p +/-200mV

Power Supply The 1018 can be powered continuously from a 230V 50/60 Hz (110V to order)

mains supply, or from the internal rechargeable battery pack. A front panel

LED indicates when the batteries are low.

Operating Temperature: 0 to 50degC (32 to 120degF). 15 to 25degC for optimum performance.

Operating Humility: 10 to 90% non-condensing 25degC (77degF)

Dimensions 290 x 250 x 110mm (11.5 x 10 x 4.3ins) Weight 2.4kg (5.4lb)

2. Specifications

Page 5

The calibrator employs a temperature compensated zener diode as the basic

reference source. This provides the input to a precision amplifier system which

operates in a feedback stabilised mode. The gain value is determined by a set of

precision resistors which are selected by a 6 decade thumbwheel switch. The output

voltage is variable from 0V to 99.9999V in 5 ranges.

An output resistance of typically 300 milliohms is maintained on the 1V and 10V

ranges and a maximum drive current of at least 150 mA is available. The 100V range

has an output resistance of less than 2 ohm with a maximum drive current of 10mA.

The 10mV and 100mV ranges have an output resistance of 10 ohms and the user

should be aware of loading errors - a 10Kohm load will produce a 0.1% error.

When the 100mA current source range is selected, the output current is sensed by a

precision resistor. The voltage generated across this resistor is used to control the

output drive voltage, so regulating the output current. The maximum drive voltage from

the current source is 10V

The resistance range operates by directly switching the thumbwheel switch to the

output terminals. The range of resistance is 10 milliohms to 10 Kohms. However the

user must be aware of the end resistance which is approximately 0.25 ohms - this

must be compensated for.

The deviation control operates by injecting a current into the reference circuitry which

either increases or decreases the reference voltage. A front panel switch allows

positive/zero/negative deviation to be selected. The deviation is selected on a 4

decade thumbwheel switch similar to the output thumbwheel switch. The maximum

setting is .9999 and this represents 0.9999 %. The resolution is 0.0001 % or 10ppm.

The accuracy of the deviation adjustment is better than 0.5% which allows accurate

measurement of deviation from the nominal set value.

To ensure complete reliability of the thumbwheel switches they are gold plated and

employ twin controls. Therefore even if a contact fails, the unit will continue to work

correctly.

Power Supply

This unit provides both mains and battery power. The batteries are automatically

charged when the mains is connected. The power supply is mounted on the rear panel

of the unit. The power supply can be set for 220V or 240V AC 50/60 Hz. A 115V

version is available to order. The front panel ‘LOW BATT’ LED is illuminated when

the batteries are OK and gradually fades as the batteries discharge. The 1018

will operate correctly until the LED goes out.

When the mains is connected, the charging circuitry provides a charge current (40 –

45mA) for the battery and automatically reduces this to a trickle charge of 3 – 4mA

when the battery is fully charged. This means that it is impossible to over-charge the

battery. Approximately 30 – 40 hours use may be obtained between charges,

depending on the output setting.

3. Circuit and Power Supply Description

Page 6

1 Output Terminals - positive / negative / case

2 Output switch - reverse / off / normal

3 POWER Switch

4 Range Select Switches

5 Output Digit Switch. Selects the value of output

6 Deviation Digit Switch. Selects the value of deviation

7 Battery LED. Shows the state of the batteries

8 + / off / - Deviation Control

9 Null Sensitivity Control

10 Null Zero Control

11 Function Switch - ‘source’, ‘measure’ or ‘zero’

12 Null Indicator

4. Front Panel Controls

Page 7

Preparing for Use

After switching on the power and checking that the battery level is OK indicated by the ’low

batt’ LED being fully lit. If it is dim or not lit you must recharge the batteries by plugging the

unit into the mains supply. It will take approximately 12 – 14 hours to fully recharge the

battery pack. However, the 1018 may used while it is connected to the mains supply,

irrespective of the battery state.

Basic operation

Before switching on it is wise to disconnect any load from the output terminals. Set the

output switch to ‘off’ before switching on, then select the required range and dial up the

required output value on the digit switch. The output terminals can then be connected and

the signal connected by operating the output switch.

Note – When the output switch is set to the ’off’ position, there is a short circuit on the output

terminals.

Caution against minor electric shock must be exercised when using the 100V range. Also

take care not to overdrive any equipment connected to the unit (the max output current is

limited to about 10mA). Always check your wiring and connections carefully before switching

on.

Thermal emfs

When using the unit to provide a precision voltage of less than 1mV, care must be taken to

avoid Thermal emfs. These occur where temperature differences are present at the

junctions of dissimilar metals, e.g. A normal solder to copper junction has a thermal emf of

approximately 3uV/°C. Errors in the unit under stable temperature conditions are typically

less than 2uV. Always check the output from the unit with zero set. If very accurate low level

calibration is required a correction in the output setting must be made to compensate for the

thermal emfs.

Using the Deviation Control

Note : The digital deviation function operates only on the voltage and current outputs, not on

the resistance output.

To apply a percentage deviation to the output, select either positive or negative deviation

with the control switch and dial up the percentage deviation required on the digit switch.

Direct % error read-out when calibrating:

The output is set to the required nominal value. The Deviation function should then be used

to bring the reading on the unit being calibrated to the nominal value. The Deviation setting

is then the accuracy of the unit in % of the nominal. This method of calibrating is much faster

than using only the nominal value and will require mathematical calculation each time to

calculate the % error.

5. Operation

Page 8

Null Operation

Due to the extreme sensitivity of the electronic null detector it is important to ensure

that it is correctly zeroed before attempting accurate measurements.

Zero setting procedure:

a) Set function switch to ZERO.

b) Set RANGE switch to required position.

c) Sensitivity (SENS) to maximum (fully clockwise).

d) Adjust ZERO control for zero reading on null meter.

Measuring procedure:

a) Set function switch to MEASURE.

b) Set output polarity switch to NORM.

c) Set sensitivity (SENS) to minimum (fully counterclockwise).

d) Connect unknown voltage to output terminals (in the same polarity).

e) Adjust output digits and sensitivity for a null balance as required.

Page 9

Calibrating the Unit

The unit can be calibrated with a high accuracy DMM with DC voltage, current and

resistance ranges with a specification better than that of the unit’s.

Calibration is best carried out on fully charged batteries without the mains supply

connected to ensure that no mains supply interference has any effect on the readings.

It is recommended that a full calibration run is done prior to attempting to adjust any of the

1018’s internal calibration adjustment trimmers.

A complete set of results will indicate the calibration status of the unit and determine

whether or not re-adjustment is necessary. If the results are significantly different from

those shown on the sample certificate this may indicate a fault which must be rectified

before re-adjustment is attempted.

Re-adjustment of the 1018’s calibration trimmers:

Access to the trimmers requires the top cover of the case to be removed and the rear

panel to be moved away from the rear of the unit. This allows access to the trimmers - see

picture below. Remove the top cover as follows,

Remove the three case fixing screws. These are located in recessed holes in the bottom

of the case. Note that the recessed holes are covered with push fit rubber feet which must

be removed to give access to the fixing screws. Once the screws have been removed

place the 1018 on a flat surface, the top section of the cover can then be eased off and the

rear panel/power supply can be moved back to allow access to the calibration trimmers

which are shown on the diagram below. Please note that the main reference module and

null amplifier module are not shown in this diagram - there are two trimmers on each.

6. Calibration

-Deviation Adjust

+Deviation Adjust

100mA Full Scale Adjust

10V Full Scale Adjust

100mV & 10mV

Full Scale Adjust

100V Full Scale Adjust

1V Zero Adjust 1V Full Scale Adjust

Null Zero Current

Offset Adjust

Null Zero Voltage

Adjust

Page 10

Calibration sequence

A high performance DMM is required for the calibration. Time Electronics’ 5075 or

equivalent is suitable.

Source Function Calibration:

Select ’source’ on the Function switch

Select ’off’ on the Deviation switch

Set all Deviation digit switches to zero

1V range zero:

Select 999.999mV range.

Set output digit switch 000000

Connect the precision DMM to the 1018 output using low thermal leads.

Select a suitable range on the DMM and measure the signal.

The allowed error is 23uV.

It is recommended that it be set to less than 5uV using the zero trimmer on the module

1V range full scale:

Set output digit switch to 999999

Select suitable range on DMM.

Allowed error is 73uV

Adjust gain trimmer on the module for < 10uV

10V range zero:

Select 9.99999V range

Set digit switch to 000000

Allowed error is 200uV

There is no adjustment for this setting

10V range full scale:

Set digit switch to 999999

Allowed error is 700uV

Adjust 10V FS trimmer for 50uV or less

100V range zero:

Select the 99.9999V range

Set digit switch to 000000

Allowed error is 4mV

There is no adjustment for this setting

100V range full scale:

Set digit switch to 999999

Allowed error is 14mV

Adjust the 100V FS trimmer for 1 mV or less

100mV range zero

Select 99.999mV range

Set digit switch to 000000

Allowed error is 7uV

There is no adjustment for this setting

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