H&B LDU 179.1, Техническое руководство

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LDU 179.1 Technical Manual rev. 1.10 - February 2019 Page 7 of 45
3. Introduction and Specifications
The model LDU 179.1 is a very precise high-speed digital amplifier for weighing and force measurements with
strain gauge (SG) sensors. The LDU 179.1 can be used in legal for trade as well as for industrial applications.
The device features a CAN interface with support for the CANopen protocol as well as a full duplex RS232
interface using a straightforward ASCII command set. The LDU 179.1 and the well known LDU 78.1, both use
nearly the same command set. The LDU 179.1 with its accurate A to D converter and a sample rate of up to 1200
measurement values per second, is particularly suitable for static or dynamic measurements and control
purposes.
Specifications
Accuracy class III or IIII
Test certificate according OIML R76
10 000 intervals or n x 10 000 intervals
(n = 1, 2, 3)
Maximum number of verification scale intervals (n) 10 000
Minimum input voltage per VSI µV 0.2
Measuring range (FS) mV/V ±3.3
Maximum resolution at FS (approx.) incr. ±880000
Measuring rate Hz 9.4 to 1200
Digital filter cut-off frequency (-3dB) Hz 0.25 to 18
Bridge excitation voltage V
DC
5
Maximum bridge excitation current mA 115
Load cell cable length (for n = 10 000) m/mm
2
726
Maximum resistance per wire (for n = 10 000)
Ω
12.3
Linearity error (relative to full scale) % ±0.0005
Temperature effect on zero (relative to full scale) %/10 K ±0.0003 (Typical)
Temperature effect on span %/10 K ±0.001 (Typical)
Interface 1 CAN
Bit rate kbits/s 10 to 1000
Protocol CAN Open
Interface 2 RS-232
Baud rate bits/s 9600 to 460800
Frame format 8 data bits, 1 stop bit, no parity bits
Protocol Readable ASCII
Logical inputs 2
Maximum input voltage V
DC
30
Threshold voltage (approx.) V
DC
6
Input resistance (approx.) k
Ω
8
Logical outputs 2
Maximum voltage V
DC
30
Maximum current A 0.5
Supply voltage V
DC
10 to 30
Power consumption (without load cells) mW <250
Operating temperature range °C -15 to +55
Storage temperature range °C -30 to +70
Dimensions (LxWxH) excluding pins mm 81.3 x 30.7 x 6.5
Weight g 28
Protection IP20