Aim-TTi 1908 and 1908P advanced 5.5 digit bench multimeters

Aim-TTi 1908 and 1908P advanced 5.5 digit bench multimeters

AIM

&

THURLBY THANDAR INSTRUMENTS

1908 | 1908P

5½ digit high performance bench/portable multimeter

Dual display and dual measurement capability Internal rechargeable batteries for true portability High accuracy and resolution: 0.02%, 1μV, 1nA, 1mW Frequency, capacitance and temperature measurements Wide range of maths and data logging functions USB, RS232, GPIB and LAN (LXI) interfaces

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1908 and 1908P 5½ digit bench/portable multimeters affordable, portable precision Key Features

Dual display and dual measurement capability

Internal rechargeable batteries for true portability

High accuracy and resolution: 0.02%, 1μV, 1nA, 1mW

Frequency, capacitance and temperature measurements

Wide range of maths and data logging functions

2 or 4 terminal ohms measurement

Wide true RMS AC; AC + DC measurements

 

Software for remote control and logging included USB, RS232*, GPIB* and LAN* (LXI) interfaces

* RS232, GPIB and LAN interfaces on 1908P only.

Internal rechargeable batteries for ‘use anywhere’ versatility

Unlike most high performance bench multimeters, the 1908 and 1908P can operate without AC power whenever required.

The batteries are charged from the internal power supply and can give up to 40 hours of operation.

This enables the meter to be used in locations where no AC line power is available, or moved around multiple room locations without the nuisance of having to find a power socket.

When precision measurements are needed, handheld portable multimeters may not be up to the task. The 1908/1908P not only offers fully portable precision, but also built-in data logging for remote locations.

Two models - 1908 and 1908P

The 1908 multimeter incorporates a USB interface for remote control and readback.

The 1908P incorporates USB, RS232, GPIB and LXI compliant LAN interfaces making it suitable for a wider range of system applications. Both models can operate from either AC-line power or internal batteries, but the 1908P requires AC-line power when using the remote interfaces.

Dual display and dual measurement system

The 1908 has both a main display and a secondary display. The two displays can be used for a variety of purposes:  To display a measurement along with the selected range (e.g. 100 Vdc).

 To display a measurement in two different units (e.g. ac volts and dBm).

 To display the result of a calculated function (e.g. value and % deviation).

 To measure and display two parameters of one signal (e.g. ac and dc volts).

 To measure and display two different signals (e.g. ac volts and dc current).

Dual measurement/display combinations Primary Display Secondary Display Choices

DCV ACV ACV +DCV DCI ACI ACI + DCI dB ACV DCV ACV ACI DCI ACI ACV * requires multi-lead connection DCI* ACI* DCV DCV* ACV* DCI DCV ACI* DCI* Hz ACV* DCV* Hz Hz Hz ACI* DCI*

Capabilities in detail

Automatic or Manual ranging

Quick response auto-ranging is provided for all measurement parameters ensuring the best possible resolution at all times.

Alternatively manual ranging can be selected. The secondary display can show the range value, giving greater clarity.

Temperature Measurement

Linearised measurement is incorporated for PT100 and PT1000 platinum resistance temperature detectors (RTDs). It can use either a 2 wire or 4 wire connection and can be displayed in oC or oF.

Wideband True RMS AC

True RMS ac gives accurate measurements regardless of the waveform shape.

The wide bandwidth attenuator provides high accuracy within the audio band and gives extended response to avoid errors when measuring switching waveforms.

Measurements are normally ac coupled but, when required, the true RMS value of the ac plus dc components can be shown.

Smart functions for added power

Linear scaling with offset

This function enables a reading to be multiplied by a scale factor (A) and for an offset (b) to be added or subtracted.

This means, for example, that the electrical output of a transducer can be scaled to give a direct readout of the physical parameter e.g. temperature or weight. It is particularly useful with 4-20mA current loops.

Frequency & Capacitance

High accuracy frequency measurement (better than 0.01%) is available from 10Hz to 120kHz. A reciprocal counting technique is used to give up to 0.01Hz resolution and fast update.

Capacitance measurement is also built-in with five ranges up to 120μF.

dB measurements

AC voltages can be displayed in dB as well as voltage. Built-in zero reference scaling enables voltages to be displayed in dBm relative to a choice of impedance from 50W up to 8kW.

The voltage can be displayed simultaneously in the secondary display.

Limits comparison

This function enables the reading to be tested against high and low limits set by the user. The display then shows HI, LO or PASS in addition to the measurement result.

NOTE: the display illustrations on this page are actual size when printed at A4.

Capabilities in detail

Percentage deviation ( %)

This function enables the meter to display the percentage amount by which the reading differs from a nominal value chosen by the user.

It is invaluable for measuring tolerance or stability.

Automatic data logging

The 1908 can store up to 500 readings at any required time interval from 1 reading per second up to 1 reading every 3 hours.

A simple recall sequence allows the readings to be scrolled onto the display whenever required. Alternatively results can be downloaded using the remote interfaces.

As a result, tedious time related measurement sequences can be handled automatically without disrupting your work.

Manual storage of readings is also available eliminating the need for paper and pencil when making a series of measurements.

Storage can also be triggered from contact closure or from the digital interfaces.

Min-Max storage

The Min-Max function stores the highest and lowest values of a set of readings.

This facility has many uses such as checking for power supply glitches and recording peak temperature excursions.

Power measurement in Watts or VA

In addition to dBs, power can be measured in Watts or VA.

For resistive loads the Watts function calculates V audio measurements.

2 /R for any load resistance between 1W and 10kW, a particularly useful function for

External Triggering

An external trigger connector is provided on the rear panel.

This provides for external triggering of measurement hold or measurement log.

An opto-isolated open collector output is available for synchronisation with the measurement update.

The VA function makes use of the dual measurement capability and displays the product of voltage and current.

Safety | Calibration Comprehensive safety protection

The meters incorporates extensive protection against damage from accidental overloads on all ranges including 10 Amps.

They also meet the stringent safety requirements of EN61010-1 2010 and EN61010-2-030 2010 for measurements up to 1kV or 600V (Cat. II).

Kensington Security Slot

A Kensington ® security slot is incorporated into the rear panel.

This enables the instrument to be secured using the widely used Kensington cable system.

Closed case calibration

The meter stores its calibration constants in protected memory and can be recalibrated without ever opening the case.

Remote Interfaces Graphical Interface for PC 1908 - USB interface

The 1908 incorporates a USB interface for remote control and readback. The interface is powered from the controlling device enabling the meter to operate from batteries without additional power drain.

1908P - comprehensive bus interfaces

To meet a wider variety of system needs, the 1908P adds a comprehensive array of digital bus interfaces. USB, RS-232, GPIB and LAN (Ethernet) with LXI support are all included. The GPIB interface is compliant with IEEE-488.1 and IEEE-488.2. GPIB remains a widely used interface for system applications.

applications.

An RS-232/RS-423 interface is provided for use with legacy systems. This type of serial interface remains in common useage and is perfectly satisfactory for lower speed USB provides a simple and convenient means of connection to a PC and is particularly appropriate for small system use. A USB driver is provided which supports Windows 2000 and above including Win 8 and 10.

The LAN interface uses a standard 10/100 base-T Ethernet hardware connection with ICMP and TCP/IP Protocol for connection to a Local Area Network or direct connection to a single PC. This interface supports LXI and is highly appropriate for system use because of its scalable nature and low cost interconnection.

systems. The LAN interface is LXI compliant. LXI (LAN eXtensions for Instrumentation) is the next-generation, LAN-based modular architecture standard for automated test systems managed by the LXI Consortium, and is expected to become the successor to GPIB in many For more information on LXI and how it replaces GPIB, or operates along side it, go to: www.aimtti.com/go/lxi

IVI Driver

An IVI driver for Windows is included. This provides support for common high-level applications such as LabView*, LabWindows*, and HP/Agilent VEE*. * LabView and LabWindows are trademarks of National Instruments. HPVEE (now Agilent VEE) is a trademark of Agilent Technologies. * Windows is a trademark of Microsoft.

Both the 1908 and 1908P are supplied with a Windows* based application called “1908-PC Link” that provides a graphical user interface (GUI) for remote control of the meter from a PC. Connection can be via USB, RS-232, or LAN (Ethernet).

The application provides remote access to the instrument using a point and-click interface arranged similarly to the actual instrument.

Measurement function can be selected for both the main and secondary displays, along with measurement range. The display includes an analog bar-graph with minimum and maximum reading markers.

A logger function enables both measurements to be recorded at set time intervals and displayed in both graphical and tabular views. The logged data can be exported to a CSV file.

The application also provides a means of downloading the contents of the internal logger of the meter itself, and exporting it to a CSV file.

1908P rear panel (protective buffer removed)

Technical Specifications - 1908 and 1908P

MEASUREMENT PARAMETERS & ACCURACY

Accuracies apply for 1 year 19°C to 25°C. Temperature coefficient outside these limits is <0.1 x quoted range accuracy per °C.

Scale Length

The scale length is 120,000 counts (unless otherwise stated) giving a maximum measured value for each range of 119999. Thus for the 100V range the maximum measured value is 119.999 volts Accuracies are quoted in terms of a percentage of the measured value plus a number of least significant digits.

Reading Rate

Varies with measurement parameter. Selectable as 4 readings/second or 20 readings/second for most parameters.

DC Voltage Range

100mV 1000mV 10V 100V 1000V

Accuracy

0.02% ± 3 digits* 0.02% ± 3 digits.

0.02% ± 3 digits.

0.02% ± 3 digits 0.02% ± 3 digits

Resolution

1µV 10µV 100µV 1mV 10mV * after null Input Impedance: 10MW//<100pF, except for Vdc plus Vac measurement when the Maximum Input: NMR: CMR: Max. AC volts 1MW ac attenuator is in parallel with the 10MW dc attenuator.

1kV DC or AC peak, any range.

>60dB at 50/60Hz.

1kW unbalanced CMR is >90dB at DC/50Hz/60Hz.

Maximum AC voltage (45Hz-50kHz) that can be applied without affecting the accuracy of the DC measurement.

Range Max. AC 100mV 6V 1000mV 6V 10V 80V 100V 200V 1000V 1000V

AC Voltage (True RMS) Range

100mV 1000mV 10V 100V 750V

Accuracy

45Hz - 10kHz 10kHz - 30kHz 0.3% ± 100 dig.. 1.5% ± 100 dig..

0.3% ± 100 dig... 0.5% ± 100 dig 0.3% ± 100 dig... 0.5% ± 100 dig 0.3% ± 100 dig.

0.3% ± 100 dig.

0.5% ± 100 dig 0.5% ± 100 dig 20kHz - 100kHz 5% ± 200 dig.

3% ± 100 dig.

3% ± 100 dig.

3% ± 100 dig.

3% ± 100 dig.

Resolution

1µV 10µV 100µV 1mV 10mV Accuracy specifications apply for readings between 10,000 and 120,000 counts. Additional error at crest factor = 3 is typically 0.5%.

Input Impedance: 1MW//<100pF Maximum Input: 750V rms, 1000V peak; any range.

CMR: 1kW Unbalanced CMR is >60dB at DC/50Hz/60Hz

AC + DC Voltage

Total measurement error will not exceed the sum of the separate ac and dc accuracy specifications plus 10 digits.

Resistance Range

100mW 1000mW 10W 100W 1000W

Accuracy

0.05% ± 8 digits 0.05% ± 5 digits.

0.05% ± 5 digits.

0.05% ± 5 digits 0.3% ± 2 digits

Resolution

1mW 10mW 100mW 1W 10W Maximum Input: 1000V DC or AC rms, any range.

Max. O/C Voltage: 3.5V

DC Current Range

10mA 100mA 1000mA 10A (<5A) 10A (>5A)

Accuracy

0.05% ± 5 digits 0.05% ± 5 digits.

0.2% ± 5 digits.

0.2% ± 5 digits 0.5% ± 10 digits

Resolution

100nA 1µA 10µA 100µA 100µA Maximum Input: Voltage Burden: mA ranges - 1.6A DC or AC rms, 1000V, fuse protected.

10A range - 10A DC or AC rms, 1000V, fuse protected.

10mA range - <100mV, 100mA, 1A, 10A ranges - <600mV

AC Current (True RMS) Range

10mA 100mA 1000mA 10A (<5A) 10A (>5A) Accuracy (45Hz to 10kHz) 0.35% ± 20 digits 0.35% ± 20 digits.

0.5% ± 20 digits.

0.5% ± 20 digits 1% ± 20 digits

Resolution

100nA 1µA 10µA 100µA 100µA Accuracy specifications apply for readings between 10,000 and 120,000 counts. Additional error at crest factor = 3 is typically 0.5%.

Maximum Input: mA ranges - 1.6A DC or AC rms, 1000V, fuse protected.

Voltage Burden: 10A range - 10A DC or AC rms, 1000V, fuse protected.

10mA range - <100mV, 100mA, 1A, 10A ranges - <600mV

AC + DC Current

Total measurement error will not exceed the sum of the separate ac and dc accuracy specifications plus 10 digits.

Frequency Range

100Hz 1000Hz 10kHz 100kHz

Accuracy

0.01% ± 1 digit 0.01% ± 1 digit.

0.01% ± 1 digit.

0.01% ± 1 digit

Resolution

0.01Hz

0.1Hz

1Hz 10Hz Scale Length: Frequency Range: 10Hz to >100kHz Input sensitivity: 12,000 counts Better than 30mVrms (100mV range); better than 10% of range for all other Vac and Iac ranges.

Capacitance Range

10nF 100nF 1µF 10µF 100µF Scale Length:

Accuracy

2% ± 5 digits 2% ± 5 digits.

2% ± 5 digits 2% ± 5 digits 5% ± 5 digits 1200 counts

Resolution

10pF 100pF 1nF 10nF 100nF

Temperature

Linearised measurement for PT100 or PT1000 RTD probes, 2-wire or 4-wire measurement, display in o C or o F.

RTD

PT100 PT1000

Range

-50 to 400 o C -50 to 400 o C

Accuracy

0.05% ± 0.5

o C 0.05% ± 0.5

o C

Resolution

0.1

o C 0.1

o C N. B. Accuracy specifications apply to multimeter only, they do not account for additional probe accuracy errors.

Continuity and Diode Test

Continuity: 100W range selected; audible tone sounds for impedance <10W.

Diode Test: Max. O/C Voltage: 3.5V

Maximum Input: Test current approximately 1mA; displays voltages up to 1.2V.

1000V DC or AC rms, any range.

EXTERNAL REMOTE TRIGGER (TTL/CMOS)

Connection: Input: Output: Terminal block on rear panel.

Input to the LED of an opto-isolator through 1kW resistor. Apply >+3V to trigger remote input. Max. Voltage 10V. Opto-isolated open collector output, conducts for 250ms on completion of input trigger. Max. off-state Voltage: 10V. On state sink current 2mA (typical).

DISPLAY

Display Type: Scale Length: Annunciators: Overrange: Overflow: High contrast backlit transflective LCD. Main display 5½ digits 17mm high, Secondary display 6 digits 10mm high.

120,000 counts for most measurement parameters LCD annunciators for all ranges, functions and program modes.

Displays OFL if input too large for range.

Displays -Or- if calculated result overflows display.

Technical Specifications - 1908 and 1908P (continued)

COMPUTING FUNCTIONS

Null (Relative) W Null: Hold: T-Hold: dB: AC plus DC: % Deviation: Ax+B: Limits: Min/Max: Power: VA: Data Logger: Stores current reading and subtracts it from future readings.

Additional non-volatile function for nulling test lead resistance.

Reading is frozen (Touch & Hold) Reading is frozen when stable.

Displays measurement in dBm relative to 600W or other user-entered impedance.

The RMS value of the ac plus dc parts of the signal is calculated and displayed.

Displays % deviation from entered reference value.

Linear scaling of results, with offset.

Reading displayed with HI, LO, or PASS with respect to user-defined high and low limits.

Minimum and maximum reading stored.

Calculates V 2 /R and displays in Watts with respect to a user-defined impedance.

Calculates and displays Volts x Amps.

Manual or automatic storage of 500 measurements. Storage interval 1s to 9999s or at the measurement sample rate, manually from keyboard, or by external triggering..

DIGITAL INTERFACES - 1908

Full digital remote control facilities are available through a USB connection.

USB: Standard USB 2.0 hardware connection. Host Powered.

DIGITAL INTERFACES - 1908P

Full digital remote control facilities are available through the USB, RS232, LAN and GPIB interfaces.

USB: Standard USB 2.0 hardware connection. Host Powered.

RS232: LAN: GPIB: Standard 9-pin D-connector. Baud rate 9600. Ethernet 100/10base-T hardware connection. LXI Conformance: 1.4 LXI Core 2011.

Conforms with IEEE488.1 and IEEE488.2.

SOFTWARE SUPPLIED

IVI Driver: LV/CVI Driver: USB Driver: An IVI driver for Windows is supplied. Full installation for CVI and LabVIEW instrument drivers.

An installation file is supplied calling a standard Windows* USB driver.

POWER REQUIREMENTS

AC Input: 220V-240V or 110-120V AC ±10%, 50/60Hz, by internal a Batteries: Battery Life: djustment; 8VA max. Installation Category II. Internal rechargeable Nickel Metal Hydride > 20 hours with the backlight enabled. Battery life can be increased to > 35 hours with the backlight disabled.

GENERAL

Operating Range: +5°C to + 40°C, 20% to 80% RH Storage Range: -20°C to + 60°C Environmental: Safety: EMC: Security: Size: Weight: Indoor use at altitudes up to 2000m, Pollution Degree 2.

Complies with EN61010-1 2010 and EN61010-2-030 2010.

Complies with EN61326.

Kensington security slot incorporated.

260(W) x 88(H) x 235(D)mm, excl. handle and feet.

2.0kg.

Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the right to alter specifications without prior notice. Available from: Designed and built in Europe by:

Thurlby Thandar Instruments Ltd.

Glebe Road, Huntingdon, Cambridgeshire. PE29 7DR United Kingdom Tel: +44 1480 412451 Fax: +44 1480 450409 Email: [email protected] Web: www.aimtti.com Brochure Part No. 82100-1530 Iss. 0

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