Cable Loss & Frequency Filter Calculator

Estimate the signal attenuation and the cut-off (−3 dB) frequency introduced by a transmission cable for voltage-mode, current-mode and IEPE signal chains. Gold fields are inputs.

Cable run SHARED

Length of cable meters

Cable specific resistance (R_c) Ohm/km

Cable resistance (one conductor) —

Pick a transmission cable in the Voltage or Current card to auto-fill its datasheet capacitance and resistance. R_c is shared across all modes — the last cable selected sets it.

Voltage mode V

Transmission cable (3-core / triad)

Output resistance from device (R_out) Ohm

Input monitor resistance (R_in) kiloOhm

Conductors number (2 pair, 3 triad) + shield

Capacitance core-to-core (C_ww) pF/m

Capacitance core-to-shield (C_ws) pF/m

Ohmic loss—

Overall capacitance C_total—

Cable capacity C_c—

Cut-off F_v —Hz

Current mode I

Transmission cable (2-core / pair)

Reading resistor in monitor (R_r) Ohm

Conductors number (2 pair, 3 triad) + shield

Capacitance core-to-core (C_ww) pF/m

Capacitance core-to-shield (C_ws) pF/m

Overall capacitance C_total—

Cable capacity C_c—

Uses cable resistance from cable run—

Cut-off F_c —Hz

I.E.P.E. mode IEPE

Constant current supplied (I_ps) mA

Sensor supply consumed, min (I_min) mA

Sensor sensitivity (Sens) mV/g

Max amplitude expected (A_max) g

Remaining current available I_a = I_ps − I_min—

Cable capacity (from current mode)—

Limit F_iepe —Hz

Additional slew-rate limit set by the available drive current. The usable bandwidth is the lowest of F_iepe and the current-mode cut-off F_c.

Field to enter (compulsory) Result — cut-off frequency Intermediate result

Cable Transmission Distance Graphs

Maximum frequency of interest transmittable over a given cable distance, from sensor to monitor, for voltage mode, current mode (MPC4) and current mode with a GSI 127 low-impedance input.

Cable & system parameters

Cable presets (datasheet)

Current-mode cable (2-core pair)

Voltage-mode cable (3-core triad)

Cable (from datasheet)

Current-mode capacitance (pair) pF/m

Voltage-mode capacitance (triad) pF/m

Cable resistance Ohm/km

Current transmission

Measuring resistance — MPC4 Ohm

Measuring resistance — GSI 127 Ohm

Voltage transmission

Sensor / conditioner output impedance Ohm

Pick a cable preset above to auto-fill its datasheet capacitance and resistance. Cable resistance is shared by all three curves — the last preset chosen sets it.

Maximum frequency of interest vs. distance

Distance (m)	Voltage (Hz)	Current (Hz)	Current w/ GSI (Hz)