npi DI-01N

The DI-01N unit is designed for differentiating or integrating time dependent signals.

A low pass filter system with Bessel characteristic is integrated to realize a distortion free differentiation of very slow signals. Four time constants are available, set with a potentiometer. The selected time constant can be tuned between 0 and 100 %.

In differentiator mode a variable damp factor can be activated (damp potentiometer) in order to avoid instability.
Output signals with DC offset can be adjusted with trim pots. A reset switch and a reset input are implemented to reset the system if necessary.

Specifications

INPUT IMPEDANCE:
1 MΩ / 20 pF

OUTPUT IMPEDANCE:
250 Ω

RESET INPUT:
1 kΩ / TTL (active high, +5V)

INPUT VOLTAGE RANGE:
±10 V (integrator mode), d/dt (U_in)max = 10 V / µs (differentiator mode)

OUTPUT VOLTAGE RANGE:
±10 V

FILTER:
2 pole low pass Bessel filter, attenuation: 24 dB/octave, cut-off frequency (fs) = 10 Hz

OFFSET:
separate external trim pots, range: ±10 V

TIME CONSTANTS:
10 s, 1 s, 0.1 s, 0.01 s (switch), 0...100 % (potentiometer)

DAMP FACTOR (diff. mode):
K=1...1000


Functional Data

DIFFERENTIATOR MODE:
U_out=T d/dt U_in (for damp=1)
frequency response: F(p)=((K-1)/K)*(pT/1+pT0), T0=T/K, K=1...1000

INTEGRATOR MODE:
U_out=1/T*integral(U_in)
frequency response: F(p)=1/pT

DIMENSIONS:
12 HP (606 mm) x 3 U (128.5 mm), 7" (175 mm) deep.

Options

DI-01N  Differentiator/Integrator Module