Time Electronics 1044 Manuale utente

1044 Voltage and Current

Calibrator

Technical Manual

Contents

1. Introduction 2

2. Specifications 4

3. Operation of the 1044 6

4. Operation of the 4-20mA System 10

5. Battery Replacement 12

6. Recalibration 13

7. Fault Diagnosis 15

8. Guarantee & Servicing 17

French Technical Manual 18

German Technical Manual 36

All Time Electronics' instruments are subject to

continuous development and improvement and in

consequence may incorporate minor detail changes

from the information contained herein.

1 - Introduction

The 1044 has been designed to offer solutions in many applications from

the R&D lab to the service engineer, in fact anywhere an accurate and

low cost calibrator is needed.

We have used our experience in designing instrumentation to bring you

the most versatile and practical calibrator yet. The 1044 can source and

measure voltage and current in one compact unit and the 0.05% accu-

racy is ideal for simulation and calibration in most engineering applica-

tions.

Being virtually foolproof in operation, the 1044 combines the advantages

of digital accuracy with analog controls. Progressing from the familiar

functions of our popular 1030 calibrator, the 1044 offers more ranges,

better accuracy and the ability to measure as well as source, making it

even more of an asset.

The large, easy to read LCD display shows the actual output, even

when the connected load exceeds the specifications. This impor-

tant feature eliminates the risk of large errors when connecting to

unknown loads. The display even shows if the battery becomes

low.

In the source mode, voltage up to 20v and current up to 20mA

may be generated in three ranges, whilst in current source mode,

the 1044 has a high 24V compliance voltage which is ideal power-

ing process control loops.

In the measurement mode, the range and function can be easily

selected and will operate as a multimeter. The measured input is

accurately shown on the LCD display.

The 1044 is housed in a pocket sized, rugged ABS case and

comes with a leatherette carry case containing a compartment for

storing test leads. Connections are by standard 4mm plugs or by

simply clamping the wires under the terminals.

A single 9V battery powers the unit or an optional external 12V DC

power supply from a mains transformer, Time Electronics order

code 7643, or a cigar lighter socket in a car may be used.

2 - Specifications

RANGES

Voltage Source

Range

Resolution

Accuracy

O/P Current

T/C per °C

0 - 200mV

0 - 2V

0 - 20V

100uV

1mV

10mV

± 0.05%

+ ± 2 Count

20mA

± 150ppm

Voltage Measure

Range

Resolution

Accuracy

O/P Voltage

T/C per °C

0 - 200mV

0 - 2V

0 - 20V

100uV

1mV

10mV

± 0.05%

+ ± 2 Count

± 150ppm

<2V = 1MΩ

<20V = 10MΩ

Current Source

Range

Resolution

Accuracy

O/P Voltage

T/C per °C

0 - 200uA

0 - 2mA

0 - 20mA

100nA

1uA

10uA

± 0.05%

+ ± 3 Count

24V Max

± 200ppm

Current Measure

Range

Resolution

Accuracy

Impedance

T/C per °C

0 - 200uA

0 - 2mA

0 - 20mA

100nA

1uA

10uA

± 0.05%

+ ± 3 Count

10Ω

± 200ppm

OUTPUT NOISE

<30ppm of f.s. on voltage, <50ppm of f.s. on current

CONNECTIONS

Connections are made by 4mm banana type connectors or may be

clamped using the wire compression feature.

BATTERIES

1 off PP3, 6AM6, MN1604 or 6LR61 type battery.

Battery life is approximately 30 Hours depending on the current sourced.

Alternatively an optional 12V power supply can be plugged into the

2.5mm socket located on the end of the unit, the tip of the plug should be

positive.

PROTECTION

The 1044 can withstand open circuits, short circuits and reverse polarity

up to 25V. Additional protection is by an internal fuse.

CONSTRUCTION

Construction is in a durable plastic case with sliding cover for battery

storage. Internally the circuit is built on a single compact PCB with plug

in display module. A carry case is also supplied for moderate protection.

DIMENSIONS AND WEIGHT

Length 142mm (5.6”) x Width 75mm (2.9”) x Height 50mm (2.0”)

Weight 280g (0.6 lbs)

3 - Operation of the 1044

CONTROLS

All the operator controls are located on the front panel with calibration

adjustments located inside the unit along with the input/output protec-

tion fuse. Refer to the Fault Diagnosis section for more information.

PRELIMINARY

Operation of the 1044 can be defined as four different procedures; volt-

age source, current source, voltage measure and current measure.

For correct operation ensure that the battery low indicator is not showing

in the display. The output will only be indicated when the polarity switch is

in either ‘normal’ or ‘reverse’ positions, not in the ‘off’ position. Be certain

to check the polarity settings before connecting the unit under test. The

display will show a negative sign ‘-’ if the output is in reverse polarity

mode.

The display will show the actual applied output in source mode so if the

value alters when the unit under test is connected, the loading specifica-

tions might be exceeded. This is also useful because it eliminates poten-

tial errors when connecting to an unknown u.u.t.

Always check the mode of operation and range values before connecting

to the unit under test or to the circuit being measured. If the 1044 will not

source or measure the protection fuse has probably blown due to an ex-

cessive current being applied to the unit. This can be found inside the

1044 - refer to the Calibration section for more details.

SETTING A VOLTAGE OUTPUT

To set a voltage output, set the function switch to V and set the appropri-

ate voltage range. Set to the desired voltage by turning the output adjust

multiturn potentiometer, the output voltage shown in the display will alter.

The unit under test may now be connected observing the polarity.

SETTING A CURRENT OUTPUT

To set a current output, set the function switch to mA and set the appropri-

ate current range ensuring that the output adjust potentiometer is set to

zero. Connect the unit under test. The desired current can be set by turning

the output adjust multiturn potentiometer where the output current shown in

the display will alter. To obtain a current reading, a load must be connected

to the output of the 1044.

Note that if the current output is set to its maximum but is not indicated

on the display, the output load is probably too high or the battery is low.

Therefore reduce the loop resistance or replace the battery.

MEASURING A VOLTAGE INPUT

To measure a voltage input select the V function and select the appropri-

ate range. If the input is unknown then choose the highest range. Select

the measure mode and ensure that the polarity switch is set to normal. The

reading should now be displayed. If the display shows the digit 1 with a

blank character then the unit has over-ranged and must be switched to the

next highest range.

MEASURING A CURRENT INPUT

To measure a current input select the mA function and select the appropri-

ate range. If the input is unknown then choose the highest current range.

Select the measure mode and ensure that the polarity switch is set to nor-

mal. The reading should now be displayed. If the display shows the digit 1

with a blank character then the unit has over-ranged and must be switched

to the next highest range.

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