Teac GX-1, Instruction Manual

Page: 95 / 122

Amplifiers
4-28
F/V Input Amp (AR-GXFV)
When analyzing the behavior of revolving bodies, such as in engines
or turbines, you sometimes need to record signals corresponding to the
number of revolutions. The AR-GXFV converts into voltages the fre-
quency of the pulses issued according to the revolutions, and records
the resulting values.
The AR-GXFV has a function for dividing the input signal so that the
AR-GXFV can handle a wide range of frequencies. You can use Pulse
Counts Per Rotate in GX Navi to set this function. This value is
reflected in SLOPE, and you can obtain the frequency by multiplying
the AD conversion value by the SLOPE value.
Units of rpm (revolutions per minute) are usually used. To convert the
frequency Hz to rpm, if you use Change Unit to set 1 Hz = 60 rpm,
processing will be in rpm units. For example, when 4 pulses are
obtained for one revolution, set the frequency division ratio to 4, and
use Change Unit to set 1 Hz = 60 rpm. Processing will then be done in
rpm units. In such a case, if the frequency division ratio is recorded as
an unchanged 1, use Change Unit to set 4 Hz = 60 rpm, or 1 Hz = 15
rpm.
■
Specifications
Number of channels : 2
Input : TTL (pulse width
≥
500 ns) or AC switching
Input impedance : 10 k
Ω
Sensitivity (at AC input) : ±50 mV, ±100 mV, ±500 mV, ±1 V
Frequency range : TTL mode : 1, 100, 1 k, 10 k, 100 k, 500 kHz
(Maximum input frequency: 575 kHz)
AC mode : 10 to 200, 10 to 500, 10 to 1 k, 10 to 10 k, 10 to 20 kHz
(Maximum input frequency: 230 kHz,
Maximum permissible input voltage: ±10 V)
Response time : 10 msec
Pulse count : TTL mode : 1 to 255 (pulses/rotate x frequency-range
≤
500 kHz)
AC mode : 1 to 255 (pulses/rotate x frequency-range
≤
200 kHz)
Setting for moving average : 1 to 16 (sampling cycle: 1 ms)
Transformation precision : ±[(input-frequency ÷ 1000) + (set-frequency-range ÷ 3125)] Hz
Sampling frequency : 1 Hz to 200 kHz
Power consumption : Approx. 1.44 W
Input connector : BNC