Precision Measurement Instruments from TTi - Thurlby Thandar Instruments

  1604 - Description and Specifications

1604 - 40,000 Count LED Bench Multimeter

  40,000 counts, auto/manual ranging
  Accuracy and resolution, 0.08%, 10µV, 10mW
  Large and bright LED display (14mm/0.56")
  True RMS ac functions, wide ac bandwidth
  Frequency measurement
  Relative, T-Hold and Min-Max functions included
  Isolated RS232 interface standard

 

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A value-for-money DMM

The 1604 is a low-cost auto/manual ranging bench-top DMM with a large and bright LED display. It offers 4¾ digit (40,000 count) scale length, true RMS ac measurements, a basic accuracy of 0.08% and a resolution of 10µV, 10mOhms and 0.1µA.

A substantial bench-top instrument

The 1604 is a robust mains-powered bench-top instrument. Unlike a hand-held multimeter it stays where you put it even with heavy test leads connected. The multi-position tilt stand ensures that the large display is always readable.

Smart functions

The 1604 incorporates several “smart” functions such as Relative measurement and Minimum-Maximum storage. The T-Hold function enables readings to be held on the display automatically each time a new test point is probed.

True RMS ac ranges

All AC measurements on the 1604 are True RMS. This avoids the errors on non-sinusoidal waveforms associated with other multimeters. Good ac bandwidth enables measurement within the audio band and ensures that higher frequency components of switching waveforms are included within the measurement result.

Frequency measurement

The 1604 has a frequency function which can be selected on any ac range in order to measure the frequency of the signal. Frequencies up to 40kHz can be measured and the maximum resolution is 0.1Hz.
Isolated RS-232 interface

The 1604 is fitted with an isolated RS-232 interface. This permits remote control and data-logging to disk using optional Windows based software.
DISPLAY and RANGE CONTROL
0.56” (14mm) LED display. Annunciators for all ranges, functions and 'smart' modes. Scale Length 4¾ digits 
(± 40,000 counts) except ac ranges ( 4,000 counts). Reading rate 2.5 per second. Each measurement function can use automatic or up/down manual ranging.
RS-232 INTERFACE
Opto-isolated bi-directional RS-232 interface. 9600 baud.
GENERAL
Power: 230V or 115V AC nominal 50/60Hz, adjustable internally; operating range ±14% of nominal; 3VA max.; Installation category II
Size: 260(W) x 88(H) x 235(D)mm, excl. handle/feet.
Weight: 2.0kg (4.4lb)
Operating Range: + 5°C to 40°C, 20-80% RH.
Storage Range: - 40°C to 70°C
Safety: Complies with EN61010-1.
EMC: Complies with EN55081-1 and EN50082-1.

All accuracies apply for 1 year, 19oC to 25oC.  Temperature coefficient outside these limits is <0.1 x quoted range accuracy per oC.

DC VOLTAGE

Range

Accuracy

Resolution

Notes

400mV

0.08% ± 4 dig.

10µV

 Max. Input 265V DC/AC rms

4V

0.08% ± 4 dig.

100µV

Input impedance 10MW nominal Max. input 1kV DC or AC pkNMR: >60dB @ 50/60HzCMR: >90dB @ DC/50Hz/60Hz

 

40V

0.08% ± 4 dig.

1mV

400V

0.08% ± 4 dig.

10mV

1000V

0.09%  4 dig.

100mV

AC VOLTAGE (True RMS, 4000 count scale length)

Range

Accuracy

Resolution

  

45Hz - 400Hz

400Hz - 5kHz

5kHz - 20kHz

  

400mV

0.5% ± 4 dig.

 

1% ± 4 dig.

3% ± 4 dig.

100µV

4V

2% ± 4 dig. 

5% ± 4 dig.

1mV

40V

10mV

400V

3% ± 4 dig.

100mV

750V

1% ± 4 dig.

  

1V

Accuracies apply for readings between 10% and 100% of full scale. Additional error at crest factor = 3 is typically 1%.  Input impedance = 10MOhms nominal.  Max. input = 750V rms, 1kV pk. (265V rms on 400mV range).  1kOhm unbalanced CMR = >60dB at DC or 50Hz (60Hz rejection available as factory option).

RESISTANCE

Range

Accuracy

Resolution

Notes

400W

0.15% ± 6 dig.*

10mW

* 400Ohm specification applies after null Max. input 265V DC or AC rms on any range
.Max. open circuit voltage 4V 
40MOhm  accuracy applies up to 20M thereafter add 1%

4kW

0.1% ± 4 dig.

100mW

40kW

0.1% ± 4 dig.

1W

400kW

0.15% ± 4 dig.

10W

4MW

0.3% ± 6 dig.

100W

40MW

1.0% ± 10 dig.

1kW

DC CURRENT

Range

Accuracy

Resolution

Notes

4mA

0.1% ± 4 dig.

0.1µA

Max. input 1A (Fused)
Voltage burden <500mV 

400mA

0.1% ± 4 dig.

10µA

10A (up to 1A)

0.3% ± 4 dig.

1mA

Max. input 10A (Fused)
Voltage burden <500mV 

10A (up to 5A)

1.0% ± 4 dig.

1mA

10A (up to 10A)

3.0% ± 10 dig.

1mA

AC CURRENT (True RMS, 4000 count scale length)

Range

Accuracy

Resolution

Notes

1mA

0.5% ± 4 dig.

1µA

Max. input 1A (Fused)
Voltage burden <500mV

100mA

0.5% ± 4 dig.

100µA

10A (up to 1A)

0.8% ± 4 dig.

10mA

Max. input 10A (Fused)
Voltage burden <500mV

10A (up to 5A)

1.5% ± 4 dig.

10mA

10A (up to 10A)

3.0% ± 4 dig.

10mA

Accuracies apply over 45Hz to 10kHz for readings between 10% and 100% of range.  Additional error at crest factor = 3 is typically 1%.

FURTHER FUNCTIONS

Continuity: Selects 4kW range and sounds audible tone for impedance <10W.  Max. input 265V DC or AC rms.
Diode Test: Displays junction voltages up to 3V at a test current of 1mA at 1V.   Max. open circuit voltage approximately 4V.  Max. input 265V DC or AC rms.
Null: (Relative): Stores current reading and subtracts it from future readings.
Hold: Reading is frozen until released.
T-Hold: Reading is frozen when it becomes stable.
Min/Max: Minimum and maximum readings are stored.

 Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the right to alter specifications 
 without prior notice.

Thurlby Thandar Instruments Limited
Glebe Road, Huntingdon, Cambridgeshire PE29 7DR United Kingdom
Tel: +44 1480 412451  Fax: +44 1480 450409  Web: www.tti-test.com  Email: sales@tti-test.com