Technical Specifications

The following tables summarise the technical parameters for the various input modules which can be supplied for use with the NetPod instrumentation. The specifications shown for the strain gauge interfaces are worst case and supplied units should operate above the results displayed in the table

Specifications

High Resolution

Low Resolution

Fast card

CMMR

160 dB

160 dB

160 dB

Sample Rate

0.1 - 2 KHz

0.1 - 60 Hz

0.1 - 78 KHz

Isolation

1500V RMS

1500V RMS

Dynamic Range

150 dB

96 dB

Signal/Noise

See Note 1

> 88 dB

> 88 dB

Gain Accuracy
(Accuracy as % reading)

0.1 %

0.1%

0.1%

Settling Time

2 ms

65 ms

0.03 ms

Input Range: V1

± 5.0 V

± 2.5 V

V2

V3

V4

± 50 V
± 500 V
± 300mV

±25 V
± 250 V

Resolution: V1

V2

V3

V4

0.6 mV
6.0 mV
60.0 mV
35.7 nV

80 mV
0.8 mV
8.0 mV

2.0 mV
45 mV
0.15 mV

Input Offset: V1

V2

V3

± 1 mV/°C
±10 mV/°C
±100 mV/°C

± 1 mV/°C
±10 mV/°C
±100 mV/°C

Stability: V1

V2

V3

10 ppm/°C
10 ppm/°C
10 ppm/°C

20 ppm/°C

15 ppm/°C

Input V1
Impedance V2

V3

V4

2 MW
2 MW
20 MW
20 MW

2 MW
2 MW
20 MW

20 MW
20 MW
2 MW

Overload

250 V RMS

250 V RMS

250 V RMS

Converter Type

Sigma Delta

Gain
(Software Selectable)

1,2,4,8,16 note 2

1,2,32, 128

1

Lineraity
(accuracy as % of range)

0.0015 %

0.0015%

0.005%

Ethernet Specifications

10BaseT Network

Transmion - 10Mbps baseband
Star layout

Maximum segment length per UTP drop cable is 100 metres
Most common network cable is 24 AWG twisted pair
Segment lengths adjustable using wiring hubs and bridges

10BaseT networks are easily upgradeable for 100BaseT and GigaStream operations

Serial Port
Communications

RS485 Network

Support for up to 32 NetPods

5 wire multi-instrument configuration

Transmission speed 9600 baud Typical
Segment length 1.2 Km

Poll rate 100 ms

RS232 Link

Single user operation

9600 baud transmission speed - adjustable

Current Input

± 80 mA, 0-20 mA
0-60 mA, 4-20 mA
User Defined

± 80 mA, 0-20 mA
0-60 mA, 4-20 mA
User Defined

Note 1 (range V1)

16

Details for interface cards NPAI24-V1H1 NPAI24-V2H1 NPAI24-V3H1
NPAI16-V1 NPAI16-V2 NPAI16-V3H NPAI16-V78K

Table 1