Technical Specifications - 1908 and 1908P

Brochure Part No. 82100-1530 Issue 3

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

Accuracy

Resolution

Input Impedance

100mV

0.02% ± 3 digits*

1µV

10.11M

Ω

1000mV

0.02% ± 3 digits

10µV

10.11M

Ω

10V

0.02% ± 3 digits

100µV

10.0M

Ω

100V

0.02% ± 3 digits

1mV

10.1M

Ω

1000V

0.02% ± 3 digits

10mV

10.11M

Ω

* after null

Typical Input

10MW//<1000pF, except for Vdc plus Vac measurement when the

Impedance:

1MW AC attenuator is in parallel with the 10MW DC attenuator.

Maximum Input:

1kV DC or AC peak, any range.

NMR:

>60dB at 50/60Hz.

CMR:

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

Recommended max.peak AC + DC voltage while measuring DC voltage

Range

100mV

1000mV

10V

100V

1000V

Max. AC

1.8V

1.8V

18V

180V

1000V

The table shows the maximum peak AC (45Hz-50Hz) 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

Accuracy

Resolution

45Hz - 10kHz

10kHz - 30kHz

30kHz - 50kHz

100mV

0.2% ± 150 dig. 1.5% ± 200 dig.

-

1µV

1000mV

0.2% ± 100 dig. 0.5% ± 100 dig.

2% ± 200 dig.

10µV

10V

0.2% ± 100 dig. 0.5% ± 100 dig.

2% ± 200 dig.

100µV

100V

0.2% ± 100 dig. 0.5% ± 100 dig.

2% ± 200 dig.

1mV

750V

0.2% ± 100 dig. 0.5% ± 100 dig.

2% ± 200 dig.

10mV

Accuracy specifications apply for readings between 10,000 and 120,000 counts.

Maximum crest factor = 3 at nominal range maximum.

Input Impedance:

1MW//<1000pF

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

2-wire or 4-wire measurement

Range

Accuracy

Resolution

100W

0.05% ± 8 digits

1mW

1000W

0.05% ± 5 digits

10mW

10kW

0.05% ± 5 digits

100mW

100kW

0.05% ± 5 digits

1W

1000kW

0.3% ± 2 digits

10W

10MW

0.3% ± 2 digits

100W

Maximum Input:

1000V DC or AC rms, any range.

Max. O/C Voltage: 3.5V

DC Current

Range

Accuracy

Resolution

10mA

0.05% ± 5 digits

100nA

100mA

0.05% ± 5 digits

1µA

1000mA

0.2% ± 5 digits

10µA

10A (<5A)

0.2% ± 5 digits

100µA

10A (>5A)

0.5% ± 10 digits

100µA

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 Current (True RMS)

Range

Accuracy (45Hz to 10kHz)

Resolution

10mA

0.35% ± 20 digits

100nA

100mA

0.35% ± 20 digits

1µA

1000mA

0.5% ± 20 digits

10µA

10A (<5A)

0.5% ± 20 digits

100µA

10A (>5A)

1% ± 20 digits

100µA

Accuracy specifications apply for readings between 10,000 and 120,000 counts.

Maximum 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

Accuracy

Resolution

100Hz

0.01% ± 1 digit

0.01Hz

1000Hz

0.01% ± 1 digit

0.1Hz

10kHz

0.01% ± 1 digit

1Hz

100kHz

0.01% ± 1 digit

10Hz

Scale Length:

12,000 counts

Frequency Range:

10Hz to >100kHz

Input sensitivity:

Better than 30mVrms (100mV range);

better than 10% of range for all other Vac and Iac ranges.

Capacitance

Range

Accuracy

Resolution

10nF

2% ± 5 digits

10pF

100nF

2% ± 5 digits

100pF

1µF

2% ± 5 digits

1nF

10µF

2% ± 5 digits

10nF

100µF

5% ± 5 digits

100nF

Scale Length:

1200 counts

Temperature

Linearised measurement for PT100 or PT1000 RTD probes, 2-wire or 4-wire

measurement, display in oC or oF.

RTD

Range

Accuracy

Resolution

PT100

-50 to 400oC

0.05% ± 0.5oC

0.1oC

PT1000

-50 to 400oC

0.05% ± 0.5oC

0.1oC

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:

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

Max. O/C Voltage: 3.5V

Maximum Input:

1000V DC or AC rms, any range.

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: info@aimtti.com Web: www.aimtti.com

Technical Specifications - 1908 and 1908P (continued)

Available from:

EXTERNAL REMOTE TRIGGER (TTL/CMOS)

Connection:

Terminal block on rear panel.

Input:

Input to the LED of an opto-isolator through 1kW resistor.

Apply >+3V to trigger remote input. Max. Voltage 10V.

Output:

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:

High contrast backlit transflective LCD.

Main display 5½ digits 17mm high,

Secondary display 6 digits 10mm high.

Scale Length:

120,000 counts for most measurement parameters

Annunciators:

LCD annunciators for all ranges, functions and program modes.

Overrange:

Displays OFL if input too large for range.

Overflow:

Displays -Or- if calculated result overflows display.

COMPUTING FUNCTIONS

Null (Relative)

Stores current reading and subtracts it from future readings.

W Null:

Additional non-volatile function for nulling test lead resistance.

Hold:

Reading is frozen

T-Hold:

(Touch & Hold) Reading is frozen when stable.

dB:

Displays measurement in dBm relative to 600W or other

user-entered impedance.

AC plus DC:

The RMS value of the AC plus DC parts of the signal is calculated

and displayed.

% Deviation:

Displays % deviation from entered reference value.

Ax+b:

Linear scaling of results, with offset.

Limits:

Reading displayed with HI, LO, or PASS with respect to

user-defined high and low limits.

Min/Max:

Minimum and maximum reading stored.

Power:

Calculates V2/R and displays in Watts with respect to a

user-defined impedance.

VA:

Calculates and displays Volts x Amps.

Data Logger:

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 RS232, LAN, USB and GPIB

interfaces.(AC line power is required for RS232, LAN and GPIB interfaces.)

RS232:

Standard 9-pin D-connector. Baud rate 9600.

USB:

Standard USB 2.0 hardware connection. Host powered.

LAN:

Ethernet 100/10base-T hardware connection.

LXI Conformance: 1.4 LXI Core 2011.

GPIB (optional):

Conforms with IEEE488.1 and IEEE488.2.

Remote Command

Processing Time:

Typically <100ms.

SOFTWARE SUPPLIED

IVI Driver:

An IVI driver for Windows is supplied.

LV/CVI Driver:

Full installation for CVI and LabVIEW instrument drivers.

USB Driver:

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

adjustment; 20VA max. Installation Category II.

Batteries:

Internal rechargeable Nickel Metal Hydride

Battery Life:

> 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:

Indoor use at altitudes up to 2000m, Pollution Degree 2.

Safety and EMC:

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)

Security:

Kensington security slot incorporated.

Size:

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.

Weight:

3.2kg.

Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the right to

alter specifications without prior notice.