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SIRIUS

® 

TECHNICAL REFERENCE MANUAL 



5.13. STGM / STGM+ 



The STGM module is a universal ampliﬁer perfectly ﬁtting for strain gage and voltage              

measurements. 

5.13.1. STGMv3: Speciﬁcations 

Inputs 

Input types 

Voltage 

Full / Half / Quarter bridge strain (120 Ω and 350 Ω) 

ADC Type 

24-bit delta-sigma dual core with anti-aliasing ﬁlter 

Sampling Rate 

Simultaneous 200 kS/sec 

Dual Core Ranges (Low 

range) 

±10 V (±500 mV) 

±1 V (50 mV) 

±100 mV (±5 mV) 

±10 mV (±0.5 mV) 

Gain accuracy 

±0.05 % of reading 

Offset accuracy (Dual 

Core) 

±5 (2) mV 

±0.5 (0.2) mV 

±0.1 (0.1) mV 

Offset accuracy after 

Balance Ampliﬁer 

0.2 mV 

0.02 mV 

Typ. Dynamic Range @ 

10 kS (Dual Core) 

-137 dB (-152 dB) 

-137 dB (-147 dB) 

-130 dB (-132 dB) 

-112 dB (-112 dB) 

Typ. Noise ﬂoor @ 10 kS 

(Dual Core) 

-105 dB (-121 dB) 

-104 dB (-111 dB) 

-95 dB (-95 dB) 

-75 dB (-75 dB) 

Typ. CMR @ DC…50 Hz / 

400 Hz / 1 kHz 

88 / 86 / 84 dB 

97 / 96 / 95 dB 

111 / 110 / 102 dB 

Gain Drift 

Typical 10 PPM/K, max. 40 PPM/K 

Offset Drift 

Typical 0.3 μV/K + 5 ppm of range/K, max 2 μV/K + 10 ppm of range/K 

Gain Linearity 

<0.02 % 

Inter Channel 

Phase-mismatch 

0.02° * ﬁn [kHz] + 0.1° (@ 200 kS/sec) 

Channel Crosstalk 

-120 dB @ 10 kHz 

Input Coupling 

DC 

Input Impedance 

10 MΩ 

Max. Common Mode 

Voltage 

Isolated version: ±500 V 

Differential version: ±12 V 

Overvoltage Protection 

In+ to In-: 50 V continuous; 200 V peak (10 msec) 

Excitation Voltage 

Free programmable (16-bit DAC) 

Predeﬁned levels 

0, 1, 2.5, 5, 10 and 15 VDC 

Accuracy 

±0.05 % ±2 mV 

Drift 

±50 ppm/K ±100 μV/K 

Load stability 

0 % to 100 % load <0.01 % 

Noise @ 10 V / 350 Ω 

<150 μVrms @ 10 kS 

Line regulation over 20 Ω 

of change 

<0.005 % @ 120 Ω load 

Sense Impedance 

100 kΩ to Exc / >100 MΩ to GND 

Current limit 

45 mA 

SIRIUS

V20-1 175 / 336  

Brand	DEWESOFT
Model	SIRIUS Series
Category	Data Loggers
Language	English

DEWESOFT SIRIUS Series User Manual

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