SPECIFICATIONS
LOGGING INTERVAL 1, 5, 10, 30 seconds, 1, 5, 10, 30 minutes, or 1, 2, 4, 12 or 24 hours, programmable for each channel. Readings can also
AND SPEED be reduced to averages, maxima or minima at these intervals. Typically 10 channels per second in total.
INPUT CHANNELS 60 channels maximum, depending on input cards installed, plus 2 resident digital inputs and 2 relay outputs.
Analogue Inputs
STANDARD
ANALOGUE Each LAC1 multiplexer card can select analogue inputs from:
CARD, LAC1 Either: 15 channels of differential voltages and/or 3-wire resistances
Or: 30 channels of single-ended (common ground) voltages and/or 2-wire resistances
Directly measures voltages up to ±2V or resistances <1MΩ. Voltages up to ±50V and currents can be measured using
precision divider or shunt resistors mounted directly on the input screw terminals, or on an LPR1 or LPR1V card.
4-WIRE CARD, LFW1 Each LFW1 card can handle up to 12 bridge, potentiometric, differential voltage or 2- or 4-wire resistance sensors.
4-wire resistance measurements virtually eliminate cable resistance errors. 4-wire Pt100 platinum resistance thermometers,
(e.g. DIN 43760/BS1904 types) are measured over -200 to +850°C. In the -17 to +57°C range of Logger and
Pt100 temperature, resolution of 0.01°C and accuracy of ±0.2°C are obtained.
AC/DC INPUT CARD, Each ACD1 card provides 15 measurement channels which may be individually configured for AC voltage (true rms), DC
voltage
ACD1 (differential), 2- or 3-wire resistance. DC and resistance specifications are the same as for LAC1.
VOLTAGE READINGS Full Scale Resolution (12 bits + sign)
4 ranges, user-selected Range 1: ±4mV 1µV
or autoranged: Range 2: ±32mV 8µV
Range 3: ±262mV 64µV
Range 4: ±2.097V 0.5mV
DC Accuracy Logger temperature 15 to 25°C -20 to +60°C
(typical figures Full scale error ±0.07% (0.04%) ±0.2% (0.1%)
in brackets) Long term stability ±0.25% (0.02%) over 1 year
Differential offset ±10µV (3µV) ±0.02% ±12µV ±0.02%
Noise (0.2µV rms)
Input impedance 100MΩapprox.
Common Mode Range ±2V or ±1.05V if “+” input is closer to logger 0V than “-” input
Common Mode Rejection Ratio (140dB), on voltage range 1
AC Accuracy Input level Sinusoidal signals Sinusoidal signals Non-sinusoidal signals
(mV ac rms) 45-60 Hz, -20 to +60°C 65-1000 Hz Crest factor 1.0 to 1.7
0 to 10 Reads zero in this range Reads zero in this range Reads zero in this range
10 to 50 ±3mV maximum additional
50 to 100 ±0.6% reading ±0.25mV ±0.6% reading error ±1.0% reading
g100 to 2000 ±0.6% readin
© 2006 Delta-T Devices Ltd v1.1 Page 10
