Time Electronics 1048 Specifications

Time Electronics

1048 Voltage / Current / Loop Calibrator

• Source/measure voltage and current

• 3 source ranges: 0 to 22mA & 0 to 22V

• 3 measure ranges: 0 to 70mA & 0 to 50V

• Accuracy 0.02%

• Transmitter simulator/sink loop control

• Output steps and ramps

• Fine adjustment (inching)

• 20 hours typical battery life

SOFTWARE

DESCRIPTION

A portable instrument that operates as a current and voltage source and a multi-purpose loop calibrator.
High performance and simple operation make it suitable for R&D, service, process control engineers, and
calibration technicians. As a versatile handheld calibrator, the source and measure capabilities with 0.02%
accuracy mean the 1048 is a compact solution for most simulation and test applications.

The 1048 combines the advantages of digital accuracy with analog control. Based on the popular functionality
of the Time Electronics 1044 calibrator, the 1048 offers higher voltage and current across the three ranges,
and improved accuracy. The additional features of transmitter simulation, sink loop control, output stepping

and ramping, and incremental ne adjustment make the instrument ideal for use in the process industry.

The large, easy to read 4.5 digit LCD display shows the actual output, even when the connected load

exceeds the specications. This important feature eliminates the risk of large errors when connecting to

unknown loads. The display also indicates if the battery becomes critically low.

In the source mode, voltage up to 22V and current up to 22mA may be generated in three ranges. When in
current source mode the 1048 has a high 24V compliance voltage which is ideal for powering process loops.
In the measurement mode, the range and function can be easily selected, with the measured input accurately
shown on the display.

The step, ramp, and inching functions are simple operation, with no key press menus to learn, just switches
and buttons. A multi-turn potentiometer controls the output, with up/down incrementing buttons for ne
control. The output can be reversed (+/-) and zeroed at the ick of a switch. The automatic ramp function

enables the user to choose either 5, 11, or 21 point calibration. Manual operation can be quickly restored
by a single push of a button.

• Optional mains power supply

The 1048 is housed in a pocket sized ABS case, with carry case supplied as standard. Connections are by
standard 4mm plugs or by simply clamping the wires under the terminals. A single 9V battery powers the
unit or an external 12V DC power supply may be used which disconnects the internal battery.

APPLICATIONS

Common use is to simulate a transducer or measure the current ow in a transducer loop. The 1048 can be

used to check a 4 to 20mA system in either source or measure modes of operation, with the 24V compliance
voltage powering the loop when current source mode is selected. In the source mode, the 1048 may be

used to calibrate meters, thermocouple indicators, data loggers, for signal injection, semiconductor

characterisation, or as a backing off source. In the measure mode, the 1048 may be used in the same way
as a DMM, checking DC voltages and current over 3 ranges with excellent resolution and accuracy.

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1048 Specifications

TECHNICAL SPECIFICATION

VOLTAGE SOURCE

Range Resolution Accuracy Output Current Temp Coefcient

0 to 220mV 10µV, 100µV above 0.2V 0.05% of full scale

0 to 22V 1mV, 10mV above 20V 0.02% of full scale

VOLTAGE MEASURE

Range Resolution Accuracy Measure Load Temp Coefcient

0 to 220mV 10µV, 100µV above 0.2V 0.05% of fs ± 1 digit 1MΩ

0 to 22V 1mV, 10mV above 20V 0.02% of fs ± 1 digit 10MΩ

CURRENT SOURCE

Range Resolution Accuracy Output Voltage Temp Coefcient

0 to 220µA 10nA, 0.1µA above 200mA 0.05% of full scale

0 to 22mA 1µA, 10µA above 20mA 0.02% of full scale

CURRENT MEASURE

Range Resolution Accuracy Input Load Temp Coefcient

0 to 220µA 10nA, 0.1µA above 200mA 0.05% of fs ± 1 digit 1kΩ

0 to 2.2mA 0.1µA, 1µA above 2mA 0.02% of fs ± 1 digit 110Ω

0 to 22mA

1µA, 10µA above 20mA

20mA ± 6ppm/°C0 to 2.2V 100µV, 1mV above 2V 0.02% of full scale

± 3ppm/°C0 to 2.2V 100µV, 1mV above 2V 0.02% of fs ± 1 digit 1MΩ

24V Max ± 12ppm/°C0 to 2.2mA 0.1µA, 1µA above 2mA 0.02% of full scale

± 8ppm/°C

0.02% of fs ± 1 digit 16Ω

SINK (TX SIM) .......................................... 2 wire transmitter simulation: External excitation voltage, 3V min, 50V max.

The current sink levels are adjustable, with accuracies as in the 3 source ranges shown above. Note: Accuracies in all measure modes are +/- 1 digit.

OUTPUT STEPS ...................................... 5 xed 4mA steps for current output 4, 8, 12, 16 & 20mA

.................................................................. 11 xed 1V steps for voltage output 0,1,2...10V

.................................................................. 21 xed steps 1V/1mA for V & I output 0,1,2...20

Stepping can be done manually or automatically (Autostep). Stepping speed is adjustable (1-9 sec/step). Dwell time (top and bottom) is one step period.
In step mode the accuracy is limited to 0.05% of span +/- 1 digit.

OUTPUT RAMP ....................................... Current Ramp 4 to 20, or 0 to 20 on all ranges.

.................................................................. Voltage Ramp 0 to 10, or 0 to 20 on all ranges.

Ramp time 7 seconds. Dwell (top/bottom) 5 seconds. Manual restart. Ramp operation is also available in Sink (TX SIM).

OUTPUT ADJUSTMENT ......................... A ten turn potentiometer for quick setting, with ne adjust using up/down increment buttons.

Connections ............................................. Made by 4mm connectors or clamped using the wire compression feature.

Power ....................................................... PP3 size, 9V battery. Approximately 20 hours life depending on the current sourced. Alternatively

.................................................................. an optional 12V power supply can be plugged into the 2.5mm socket on the top of the unit.

Protection ................................................. The 1048 can withstand open circuits, short circuits and reverse polarity up to 25V.

.................................................................. Additional protection is by an internal fuse.

GENERAL SPECIFICATION

Dimensions ............................................H142 x W78 x D50mm

Weight ....................................................0.30kg

Operating temperature ..........................-10 to 50°C. Storage temperature -30 to 70°C.

Operating humidity ................................0 to 90% non-condensing at 25°C

Optional Extras .......................................230V or 110V Mains Power Supply. Calibration Certicates – traceable to NPL and UKAS

ORDERING INFORMATION

1048 .......................................................Voltage/Current/Loop Calibrator

7643........................................................230V Mains Power Supply

7652........................................................110V Mains Power Supply

C176 .......................................................Factory (NPL Traceable) Calibration Certicate

C138 .......................................................UKAS Calibration Certicate (ISO 17025)

Due to continuous development Time Electronics reserves

the right to change specifications without prior notice.

Time Electronics Ltd, Unit 11 Sovereign Way, Botany Industrial Estate, Tonbridge, Kent, TN9 1RH. United Kingdom.

T: [phone] F: [phone] E: [e-mail]

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