1048 Handheld Voltage / Current / Loop Calibrator Data Sheet0 pages

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

• Optional mains power supply

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 fine 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 specifications. 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 fine
control. The output can be reversed (+/-) and zeroed at the flick 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.
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 flow 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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