Vibration Comparator Frequently Asked Questions

Question number FAQ-1392

Regarding voltage output (THR, AC, DC)

The VC has three types of voltage output: THR, AC, and DC, and outputs them simultaneously.
The THR and AC outputs can be used as analysis signals for devices such as FFT analyzers, while the DC output can be used as a recorder output.

Voltage output	Rear panel terminal block	Output voltage
THR	No.10： + No.11：COM	The input signal is amplified and output at the "THRGAIN" magnification displayed in the COND MONI menu below. This magnification is automatically determined by the input range and SENS sensitivity setting and cannot be changed arbitrarily. (This is a signal output that does not pass through the bandpass filter.) (Example) When using Accelerometer with a value of 5 mV/ms^-2; When the menu display shows ×1 or ×5, the voltage output will be at the following ratios. THR output = 5 mV/ms^{- 2} (in the case of ×1) THR output = 25 mV/ms^{- 2} (in the case of ×5) Maximum output voltage ±5 V
AC	No.14： + No.15：COM	Select one of the A, B (or C) bands. It will output a band-limited AC signal in that band. The bar indicator outputs the ±full-scale value as ±100% (= ±5V). Maximum output voltage: ±5V
DC	No.12： + No.13：COM	The AC signal, band-limited within the A, B (or C) band as indicated, is converted to an RMS value and output as a DC signal. If integration is ON, the integrated signal is output. The bar indicator's value from 0 to full scale (when the scale is set to ×1) is output as 0 to +100% (= 0 to +5V). Maximum output voltage: +5V When the VC-0253 current output option is installed, the "DC" terminal becomes a current output. It converts 0 to 5V to 4mA to 20mA and outputs the current.

Voltage output

Rear panel terminal block

Output voltage

THR

No.10： +
No.11：COM

The input signal is amplified and output at the "THRGAIN" magnification displayed in the COND MONI menu below. This magnification is automatically determined by the input range and SENS sensitivity setting and cannot be changed arbitrarily.
(This is a signal output that does not pass through the bandpass filter.)

(Example) When using Accelerometer with a value of 5 mV/ms^-2;
When the menu display shows ×1 or ×5, the voltage output will be at the following ratios.

THR output = 5 mV/ms^{- 2} (in the case of ×1)
THR output = 25 mV/ms^{- 2} (in the case of ×5)

Maximum output voltage ±5 V

No.14： +
No.15：COM

Select one of the A, B (or C) bands. It will output a band-limited AC signal in that band.

The bar indicator outputs the ±full-scale value as ±100% (= ±5V). Maximum output voltage: ±5V

No.12： +
No.13：COM

The AC signal, band-limited within the A, B (or C) band as indicated, is converted to an RMS value and output as a DC signal. If integration is ON, the integrated signal is output.

The bar indicator's value from 0 to full scale (when the scale is set to ×1) is output as 0 to +100% (= 0 to +5V). Maximum output voltage: +5V

When the VC-0253 current output option is installed, the "DC" terminal becomes a current output. It converts 0 to 5V to 4mA to 20mA and outputs the current.

(Note) Even when the bar indicator's display scale is enlarged (e.g., SCL X2), the full scale when the enlargement is OFF is 100%.

Full scale 100 m/ ^s²
If the acceleration amplitude is 50 m/ ^s²

Whether PEAK or RMS
The AC output voltage is 2.5 V per amplitude.
The DC output voltage is 1.76 V
This is what it will be

■ Checking the gain of the THR output

Press the MENU key to open the CONDITION SET menu.
Use the ∧ and ∨ keys to move the cursor to 8:MONI (highlight it), then press the ENT key.
Opens the COND MONI menu.

1: Check the magnification displayed in the THR GAIN section.

■THR, AC, DC output terminal

Last updated: 2018-03-01