Omega Vehicle Security OMB-NETSCAN 1500 User Manual download pdf (Page 131)

Hardware 7-13

Digital Filtering:

•

Averages 32 samples at 50/60 Hz for line cycle noise rejection (VDC measurements)

Voltage Range

, Accuracy

and Resolution:

•

±100 mV

0.02% 3.05

V/bit

•

±1 V

0.02% 30.5

V/bit

•

±5 V

0.02% 153

V/bit

•

±10 V

0.02% 306

V/bit

Note 1:

Accuracy is based on 18 to 28

C, 1 year; includes cold junction compensation; excludes thermocouple errors;

thermocouple readings based on NIST Monograph 175. Resolution given is the typical value. Add ±5°C for common

mode voltages greater than 25 VAC.

Note 2:

Voltage range is maximum peak-to-peak signal for AC volts.

Note 3:

For AC voltages where the frequency of the input signal is an integer multiple of the AC line cycle ±1%; with line cycle

integration enabled.

Note 4:

Specified for coupling impedance >30 M

Ω

and common mode frequency < 60 Hz. 300 VDC or 300 VAC peak before

equipment damage occurs.

Note 5:

There is a 4700 pico-farad, polypropylene capacitor connected across the input terminals of each channel. This

capacitor filters input noise when measuring signals from thermocouples. When the circuit card is set to the ±100 mV

range, the capacitor reacts with user source impedance to form a low pass filter. The filter pole frequency is:

1/(2*pi*(RSHI + RSLO)*4700 * 10

-12

), where RSHI and RSLO are the source resistance of the input leads.

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Omega Vehicle Security OMB-NETSCAN 1500 User Manual Page 131

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