Instruction manual

Setting Tachometer Pulse Inputs
6-5
Setting Tachometer Pulse Inputs
You can use the tachometer pulse inputs to the PULSE IN A/B connectors of the LX-120.
Number of Input Channels 16 bits mode: 2 channels 32 bits mode: 1 channel or 2 channels
Input Format Threshold Level + 0.5 V, + 1 V, + 2.5 V, + 5 V, + 10 V, + 20 V selectable
(Maximum input voltage +/- 50 V)
(Applicable input frequency 450 kHz)
Input impedance 100 k Ω
Measurement mode (1) pulse (gate): Pulse count mode within the gate time
Range: 1 to 255 times of the sampling frequency
Accuracy: ± 2 counts
(2) pulse (total): Total counts from measurement start to stop
Accuracy: ± 5 counts
(3) period: Cycle count mode
Range: 1 msec、5 msec、10 msec、50 msec、
100 msec、500 msec、1 sec
Accuracy: +/- 0.3 % (at 16 bits mode) +/- 0.2 % (at 32 bits mode)
(4) frequency: Frequency measurement mode
Range: 10 Hz、20 Hz、50 Hz、100 Hz、200 Hz、
500Hz、1 kHz、10 kHz、20 kHz
Accuracy: +/- 0.3 % (at 16 bits mode) +/- 0.2 % (at 32 bits mode)
(5) rpm: RPM measurement mode
Range: 1500 rpm、3000 rpm、6000 rpm、9000 rpm、
12000 rpm, 18000 rpm, 24000 rpm
Accuracy: +/- 0.3 % (at 16 bits mode) +/- 0.2 % (at 32 bits mode)
Divided Rate: 1 ～ 255
Moving Average: 1 ～ 16
Number of Pulse per Revolution: 1 ～ 255
Tachometer Pulse Timing If the measurement mode is either of cycle count mode, frequency
measurement, or RPM mode:
Use LSB 1 bit for the tachometer pulse timing
Note that this function is available at the sampling frequency of 48 kHz
or lower.
■ In case of 16bits A/D, 1 x 16 bits tachometer pulse input channel is equivalent to 1 x analog input channel.
1 x 32 bits tachometer pulse input channel is equivalent to 2 x analog input channels. In case of 24 bits A/D,
1 x 32 bits tachometer pulse input channels is equivalent to 1 x analog input channel. Therefore, if you turn
ON tachometer pulse input channel(s), in order keep the same analog input channels, lower the sampling
frequency is required by following the setting of tachometer pulse input channel(s).
Set ■ Moving Average to [1] only, when the sampling frequency of 102.4 kHz, 100 kHz, 96 kHz, 65.536
kHz, 51.2 kHz, 50 kHz, 48 kHz, or 32.768 kHz is selected.
■ Only 1 x 32 bits tachometer pulse input can be selected when the sampling frequency of 102.4 kHz, 100
kHz, 96 kHz, or 65.536 kHz is selected.
■ The LX Navi cannot monitor the tachometer pulse input in waveform display. Use the digital display to
monitor.
■ The LX cannot playback the recorded tachometer pulse input signals. Process the data as digital data file.
■ You cannot use the tachometer pulse input channels and the generator output function at the time.
In 24 bits A/D, 16 bits mode of tachometer input is not available.■