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Transducer for Measurement Bridges
     
Specifications (Maximum values at 25°C, unless otherwise stated)
| General |
A |
C |
D |
Unit |
| Linearity error in the 50 mV range1 |
0.01 |
0.02 |
0.05 |
% |
| Calibration error, SCM 15/90 (0-64 mV = 0-10 V)1 |
0.05 |
0.1 |
|
% |
| 3 dB-bandwidth, SCM 10/32/70/82, typ.2 3 |
4-15 |
4-15 |
4-15 |
Hz |
| 3 dB-bandwidth SCM 15/90S, programmable4 |
3-15k |
3-15k |
|
Hz |
| Influence of operating voltage (24 VDC), typ. |
0.005 |
0.005 |
0.005 |
%/V |
|
| Input: |
A |
C |
D |
Unit |
| Input current, typ. |
1 |
1 |
30 |
nA |
| Noise 0.1-10 Hz, pp RTI, typ. |
0.5 |
1.0 |
1.5 |
µV |
| Error when switching range, SCM 15/901 |
0.2 |
0.3 |
|
% |
| Common mode input range, unipolar SCM 10/32/70/82 |
1 bis 7 |
1 bis 7 |
1 bis 7 |
V |
| Common mode input range, bipolar und SCM 15/90 |
-7 bis 7 |
-7 bis 7 |
|
V |
|
| Stability of zero point with respect to: |
A |
C |
D |
Unit |
| Temperature (RTI)1 |
0.3 |
1 |
5 |
µV/K |
| Aging, 1 year (RTI)1 |
5 |
10 |
|
µV |
| Aging, 10 years (RTI)1 |
20 |
40 |
|
µV |
|
| Stability of the amplifier with respect to: |
A |
C |
D |
Unit |
| Temperature1 |
25 |
70 |
150 |
ppm/K |
| Aging, 1 year1 |
400 |
800 |
|
ppm |
| Aging, 10 years1 |
1200 |
2500 |
|
ppm |
|
| Voltage output (SIGS 10/15, SCM 70/90) |
A |
C |
D |
Unit |
| Output impedance, typ. |
50 |
50 |
50 |
Ohm |
| Max. output current, typ. |
5 |
5 |
5 |
mA |
| Min. output voltage SCM 10/70 unipolar, typ. |
6 |
6 |
40 |
mV |
| Max. output voltage SCM15/90, typ. |
10.5 |
10.5 |
|
V |
| Min. output voltage SCM 15/90, typ. |
-10.2 |
-10.2 |
|
V |
|
| Current output (SIG 15/32, SCM 82/90) |
A |
C |
D |
Unit |
| Load, max. |
300 |
300 |
300 |
Ohm |
| Load, typ. |
390 |
390 |
390 |
Ohm |
| Max. current (for 24 V supply) |
20.5 |
20.5 |
20.5 |
mA |
|
| Bridge supply: |
A |
C |
D |
Unit |
| Temperature drift1 |
25 |
35 |
70 |
ppm/K |
| Current, max. (for 24 V supply) |
120 |
120 |
120 |
mA |
| Deviation from reference1 |
0.5 |
1 |
2 |
% |
| 1 |
The typical error is two to four times smaller than the quoted maximum error. |
| 2 |
Second order low-pass filter. Much higher frequencies can be delivered on request (up to approx. 10 kHz). |
| 3 |
The response time (to 1% of the final value during a jump in the input signal) varies between approx. 50 ms (for 15 Hz cut-off frequency) and approx. 300ms (for 4 Hz cut-off frequency). |
4 |
The response time (to 1% of the final value during a jump in the input signal) is around 300 ms (standard). In modules with a programmable cut-off frequency (SIGS15S, SCM 90S), it varies between approx. 40us (15 kHz) and 2.1 ms (330 Hz) in the upper range and between 2.1 ms (330 Hz) and approx. 300 ms (3.3 Hz) in the lower range). |
| Temperature range |
°C |
| Recommended |
0/60 |
| Operable |
-20/90 |
Output
- Voltage output: for modules with a fixed range (SIGS 10, SCM 70), switchable between -11 V and +11 V. For programmable modules, selectable between -10 V and +10 V. For modules with a fixed range and unipolar power supply, the minimum output voltage is approx. 6 mV (D-Typ: approx. 40 mV).
- Current output: standard 0-20 mA or 4-20 mA, secure against short circuits; when ordering fixed range modules (SIGS 32, SCM 82), please specify whether 0-20 mA or 4-20 mA.
- Option: frequency output (max. 20 kHz), galvanically isolated, can be connected to a bus, see "Modules with Frequency Output" for more information.
Power Supply
- All DIN-rail modules (SCM 70-90) are designed to cope with unregulated, highly variable, industrial voltages (24 VDC).
- SCM 70/82: standard 24 VDC supply voltage. A bipolar power supply is required for a negative output voltage (e.g., ±15 V). Current requirement without load approx. 5 mA
- SCM 15/90: standard 24 VDC supply voltage. Thanks to the built-in DC-DC converter, a negative output voltage does not require a negative supply voltage. Current requirement without load approx. 28 mA.
- Other supply voltages (also AC) available on request.
Ranges/Programming
- In the programmable versions (SIGS 15/SCM 90), the measurement range is selected via SMD switches (in steps of 1 mV, measurement range max. ±127 mV, zero point max. ±15 mV), intermediate values selectable via potentiometer. Switchable bridge supply (5 V or 10 V). Output switchable (voltage/current), current output switchable between 0-20 mA and 4-20 mA. In the SIGS15S and SCM 90S modules, a potentiometer is used to select a cut-off frequency between 3 Hz and approx. 15 Hz.LI>
- Any input and output range is deliverable (as long as technically feasible) for the fixed range modules (SIGS 10/32, SCM70/82).
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