|
Accelerometer/Microphone & Differential Amplifier 4290
Description
The Model 4290 Accelerometer/Data Amplifier is a dual-channel,
medium gain device. Each channel can be configured as an AC-coupled
amplifier with constant-current
excitation for sensors, or as a differential input AC or DC
amplifier. Designed for use in the instrumentation systems test
environment, it includes many features that simplify the test
setup of accelerometers and other sensors requiring differential
input signal processing.
Design Features
In order to simplify the setup of a large number of channels,
the 4290 contains both Zero and Calibrate signal relays, which
can be controlled from either the front panel or remotely via
the RS-232 serial link. When actuated, the Zero relays provide
the user with the ability to short the input of any amplifier
to determine a base line noise for the amplifier. This is a
simple way to deduce the amount of noise contributed by the
sensor prior to amplification. A quick check of gain settings
and accuracy can be made by activating the Calibrate signal
relay that applies one of three internal DC reference signal
levels (1V, 100mV, 40mV) or a user-supplied AC or DC signal
to the input of a selected channel. These two features allow
the user to quickly troubleshoot large channel count systems.
Reduced High Frequency Noise
The 4290 provides a full 100 kHz bandwidth at a gain of 200.
High frequency noise is significantly reduced using a 4 pole
low pass filter with programmable cutoffs at 1, 5, or 20kHz.
A bypass mode in this filter allows the user to utilize the
full 100 kHz bandwidth if desired. |
| |
|
