1908 dual measurement 5.5 digit bench multimeter from Aim-TTi

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, 1mW, 0.1μA
Frequency, capacitance and temperature measurements
Wide range of maths and data logging functions
USB, RS232, GPIB and LAN (LXI) interfaces
aimtti.com
aimtti.us
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, 0.1μA, 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 more than 35 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
DCV
ACV
ACV +DCV
DCI
ACI
ACI + DCI
dB
ACV
DCV
ACV
ACI
DCI
ACI
ACV
* requires multi-lead connection
Secondary Display Choices
DCI*
ACI*
ACI*
DCI*
Hz
DCV
Hz
DCV*
ACV*
ACV*
DCV*
Hz
DCI
Hz
DCV
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.
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.
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.
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.
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.
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 an opto-isolated external trigger
input, 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 V2/R for any load
resistance between 1W and 10kW, a particularly useful function for
audio measurements.
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.
Safety | Calibration
Comprehensive safety protection
The VA function makes use of the dual measurement capability and
displays the product of voltage and current.
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 300V (Cat III),
600V (Cat. II) or 1000Vdc/750Vac (for circuits isolated from AC line).
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
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 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.
(Note that operation of the GPIB, RS-232 and LAN interfaces
requires the meter to be powered from AC line.)
The GPIB interface is compliant with
IEEE-488.1 and IEEE-488.2. GPIB
remains a widely used interface for
system 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
applications.
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.
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
systems.
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.
1908P rear panel
(protective buffer removed)
The application provides remote access to the instrument using a pointand-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.
Technical Specifications - 1908 and 1908P
MEASUREMENT PARAMETERS & ACCURACY
DC Current
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.
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
Varies with measurement parameter. Selectable as 4 readings/second or 20
readings/second for most parameters.
Maximum Input:
Voltage Burden:
DC Voltage
AC Current (True RMS)
Reading Rate
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
Input Impedance:
Maximum Input:
NMR:
CMR:
Resolution
1µV
10µV
100µV
1mV
10mV
Range
10mA
100mA
1000mA
10A (<5A)
10A (>5A)
* after null
Typically 10MW//<100pF, except for Vdc plus Vac measurement
when the 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.
Recommended max. peak AC + DC voltage while measuring DC voltage
Range
Max. AC
100mV
1.8V
1000mV
1.8V
10V
18V
100V
180V
1000V
1000V
The table shows the maximum peak AC (45Hz-50kHz) plus DC voltage that can be
applied without affecting the accuracy of the DC measurement due to overload
clamping. These values only apply when the DC component does not exceed the range
maximum and the analogue 50/60Hz rejection filter is enabled.
AC Voltage (True RMS)
Range
100mV
1000mV
10V
100V
750V
Accuracy
45Hz - 10kHz
10kHz - 30kHz
0.2% ± 150 dig. 1.5% ± 200 dig..
0.2% ± 100 dig.. 0.5% ± 100 dig
0.2% ± 100 dig.. 0.5% ± 100 dig
0.2% ± 100 dig. 0.5% ± 100 dig
0.2% ± 100 dig. 0.5% ± 100 dig
Resolution
20kHz - 100kHz
1% ± 200 dig.
1% ± 200 dig.
1% ± 200 dig.
1% ± 200 dig.
1µV
10µV
100µV
1mV
10mV
Accuracy specifications apply for readings between 10,000 and 120,000 counts.
Maximum crest factor = 3 at nominal range maximum.
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
Resolution
100nA
1µA
10µA
100µA
100µA
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
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.
10A range - 10A DC or AC rms, 1000V, fuse protected.
Voltage Burden:
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
Scale Length:
Frequency Range:
Input sensitivity:
Accuracy
0.01% ± 1 digit
0.01% ± 1 digit.
0.01% ± 1 digit.
0.01% ± 1 digit
Resolution
0.01Hz
0.1Hz
1Hz
10Hz
12,000 counts
10Hz to >100kHz
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
Resolution
10pF
100pF
1nF
10nF
100nF
1200 counts
Total measurement error will not exceed the sum of the separate ac and dc accuracy
specifications plus 10 digits.
Temperature
Resistance
Linearised measurement for PT100 or PT1000 RTD probes, 2-wire or 4-wire
measurement, display in oC or oF.
Range
100W
1000W
10kW
100kW
1000kW
10MW
Accuracy
0.05% ± 8 digits
0.05% ± 5 digits.
0.05% ± 5 digits.
0.05% ± 5 digits
0.05% ± 5 digits
0.3% ± 2 digits
Resolution
1mW
10mW
100mW
1W
10W
100W
Maximum Input: 1000V DC or AC rms, any range.
Max. O/C Voltage: 3.5V
RTD
PT100
PT1000
Range
-50 to 400oC
-50 to 400oC
Accuracy
0.05% ± 0.5oC
0.05% ± 0.5oC
Resolution
0.1oC
0.1oC
N. B. Accuracy specifications apply to multimeter only, they do not account for additional probe accuracy
errors.
Continuity and Diode Test
Continuity:
Diode Test:
Max. O/C Voltage:
Maximum Input:
1000W range selected; audible tone sounds for impedance <10W.
Test current approximately 1mA; displays voltages up to 1.2V.
3.5V
1000V DC or AC rms, any range.
Technical Specifications - 1908 and 1908P (continued)
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.
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 V2/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..
POWER REQUIREMENTS
AC Input:
Batteries:
Battery Life:
230V or 115V AC ±10%, 50/60Hz, by internal adjustment;
20VA max.
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:
Storage Range:
Environmental:
Safety and EMC:
Security:
Size:
Weight:
+5°C to + 40°C, 20% to 80% RH
-20°C to + 60°C
Indoor use at altitudes up to 2000m, Pollution Degree 2.
Complies with EN61010-1, EN61010-2-030, EN61010-2-033 &
EN61326-1. For details, request the EU Declaration of Conformity
for this instrument via http://www.aimtti.com/support
(serial no. needed).
Kensington security slot incorporated.
250(W) x 97(H) x 295(D)mm in bench-top configuration
213.5(W) x 86.5(H) x 269(D)mm ( 2U/ ½ - rack) in rack-mount
format
3.2kg.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the right to
alter specifications without prior notice.
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. (AC line power is required for RS232, LAN and GPIB interfaces.)
USB:
Standard USB 2.0 hardware connection. Host Powered.
RS232:
Standard 9-pin D-connector. Baud rate 9600.
LAN:
Ethernet 100/10base-T hardware connection.
LXI Conformance: 1.4 LXI Core 2011.
GPIB: 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.
Available from:
riešenia na presné meranie
Designed and built in Europe by:
Elso Philips Service
Jilemnického 2; 911 01 Trenčín
tel:
+421 32 6582410
fax:
+421 32 6582592
email: [email protected]
web:
www.elso.sk
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. 1

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