Fizoptika VG910H - Output Voltage of the Differential Output; Output Voltage of the Single-Ended Output

www.fizoptika.com FIZOPTIKA Fiber Optic Gyroscopes. VG910 series. Information Guide
Version #8 of 25/05/2018 Page 8 of 20
1.6.1. Output Voltage of the Differential Output
The gyro provides output voltages via two leads (OUT+, OUT-) biased at U0=1V to Common lead (GND). Both have
1kOhm impedance formed by serial resistors (shown in the Connection diagram for VG910H).
From U
(+)
= U0 + ½ SF ∙ Ω and U
(-)
= U0 - ½ SF ∙ Ω the returns are:
1) Output differential voltage U
Ω
= U
(+)
- U
(-)
= SF∙Ω (SF=8 mV/deg/s ±15%, full scale ±2V)
2) Bias voltage U
(+)
+ U
(-)
= 2U0
The positive and negative outputs of the unit should be connected to differential input amplifiers with an input impedance
of at least 500kOhm referred to ground. The amplifier should also have a good common mode rejection and a suitable
bandwidth for the application. The gyro bandwidth 1 kHz is formed by 2
nd
order LPF.
Diagnostics. Gyro failure (abnormal response to rotation) may be detected by the monitoring of U0 or +5V current (I
+5
)
- criteria (1): U0 change >0.1V (>99% confidence)
- criteria (2): I
+5
change > 20mA (>70% confidence)
1.6.2. Output Voltage of the Single-ended Output
The gyro provides output voltages via two leads - OUTPUT, AGND (shown in the Connection diagram for VG910F).
Output voltage U
Ω
= SF∙Ω (SF=7 mV/deg/s ±15%, full scale ±2.5V)
The gyro bandwidth 1 kHz is formed by 3
d
order LPF.
Diagnostics
Gyro failure (abnormal response to rotation) may be detected by the monitoring +5V current (I) change from the
certificate value (I*)
Failure criteria: if I > (I*+30mA) or I < (I*-10mA), confidence > 80%.