Analog Filter/Amplifier Systems

Precision PF-1U-FA

Multi-Channel Programmable Filter/Amplifier Systems

Exceptional Desktop Performance with a Choice of 8 or 16 Channels in a Compact Package

 

PF-1U-FA Multi-Channel Programmable Filter/Amplifier System

The PF-1U-FA Multi-Channel Programmable Filter/Amplifier System is ideal for conditioning low-level voltage inputs in front of high-resolution digital data acquisition systems.

Fully programmable 8-channel and 16-channel configurations are available in standard or high-performance models. A choice of 4 and 8-pole filter characteristics is available in low-pass and band-pass configurations. Fully programmable gain is distributed around the filter to reduce the possibility of clipping on out-of-band signals.

PF-1U-FA Description

The PF-1UA-FA series is a multi-channel programmable filter/amplifier system in a compact rack mountable or bench top package. Fully programmable 8-channel and 16-channel configurations are available in high performance or standard configurations with a selection of input connector configurations.

For units with BNC input connectors, an optional programmable current source is provided on each channel to interface the PF-1U to IEPE transducers.

For applications requiring balanced twisted/shielded cable inputs, a LEMO connector input option is available. Fully programmable input configuration (single-ended or differential) is supported for systems configured with LEMO input connectors.

Standard PF-1U-FA Model

The standard PF-1U-FA configuration offers 4-pole low-pass filters with five programmable cutoffs and gain programmable to x1,024.

High performance PF-1U-FA Model

The high performance PF-1U-FA offers a choice of 4 or 8-pole low-pass and band-pass filters with cutoffs programmable from 1 Hz to 204.6 kHz. The high performance PF-1U-FA has an upgraded wideband (500 kHz) low-noise amplifier with transducer DC suppress capability. Gain is programmable to x8,192.

View the PF-1U-FA Specification Sheet >

PF-1U-16FA 16-Channel Filter Amplifier

PF-1U-8FA 8-Channel Filter Amplifier

Innovative Technologies and Features:

Pre-Filter and Post-Filter Gain

The PF-1U-FA amplifier gain is distributed both before and after the filter to provide protection from large out-of-band energy or transients that could cause clipping before the filter, distorting the data. The post-filter gain has resolution of better than 0.05% to enable system scaling of the outputs to match the full-scale input of the external recording device. Overload detectors alert the user to over-voltage conditions.

Flat/Pulse Low-Pass Filter Technology

The PF-1U-FA low-pass filters may operate in either a “flat” mode for maximally flat pass-band amplitude response with sharp roll-off or in a “pulse” mode for low phase distortion and optimized transient response.

The “flat” mode provides passband characteristics nearly identical to a Butterworth filter while providing a much sharper roll-off. This mode is a good choice for applications such as spectral analysis. The “pulse” mode has time domain response similar to the Bessel filter yet provides superior amplitude response characteristics. The “pulse” mode is ideal for time domain applications including transient (shock) measurements and waveform analysis.

PF-1U-FA Salient Features:

PF-1U-FA Common Features:

Number of Channels:

  • 16 (PF-1U-16FA)
  • 8 (PF-1U-8FA)

Input Connectors:

  • Standard: Individual isolated BNC’s at front panel
  • Option I: Individual BNC input with programmable (IN/OUT) 6mA current source with 26 V compliance for powering IEPE transducers
  • Option 3: Individual isolated LEMO front panel input connectors. Programmable single-ended or balanced differential input

Output Connectors:

  • Individual isolated BNC’s at rear panel

Inputs:

  • Balanced differential input with programmable AC/DC coupling

Outputs:

  • DC coupled, single-ended

Test Support:

  • Test input and monitor output busses

Input Power:

  • 12 to 24 VDC external AC to DC power supply provided with unit

Control:

  • Ethernet remote control
  • Local control via supplied Window based Graphical User Interface (GUI)
  • Store up to four setups in non-volatile RAM allowing pre-configured applications

Standard PF-1U-FA Model Features:

Pre-Filter Gain:

  • x1 to x64 in x2 steps

Post-Filter Gain:

  • x0.5 to x16 with 0.05% resolution

Filters:

  • 4-pole flat/pulse low-pass filters with five programmable cutoffs between 100 Hz to 30 kHz and filter bypass (190 kHz)

High Performance PF-1U-FA Model Features:

Pre-Filter Gain:

  • x1 to x512 in x2 steps

Post-Filter Gain:

  • x0.25 to x16 with 0.05% resolution

Filters:

  • Choice of 4 or 8-pole low-pass flat/pulse filters or 8-pole band-pass filters with over 2000 programmable cutoffs from 1 Hz to 200 kHz and filter bypass (500 kHz)

Zero Suppress:

  • Programmable DC voltage inserted at channel input

PF-1U Standard vs. High Performance Comparison Table

 

PF-1U Standard Performance

PF-1U High Performance

Gain

Overall Amplifier Gain: x0.5 to x1024X with 0.05% resolution

Pre-Filter Gain: x1 to x64 in x2 steps

Post-Filter Gain: x0.5 to x16 with 0.05% resolution

Overall Amplifier Gain: x0.25 to x8192  with 0.05% resolution

Pre-Filter Gain: x1 to x512 in x2 steps

Post-Filter Gain: x0.25 to x16 with 0.05% resolution

Frequency Response

DC to 100 kHz 0 dB ±0.1 dB; –3 dB at 190 kHz

DC to 200 kHz 0 dB ±0.1 dB; –3 dB at 500 kHz

Noise

14 nV per rt. Hz at 1 kHz and pre-filter gain >64x, typical

7 nV per rt. Hz at 1 kHz and pre-filter gain >64x, typical

Zero Suppress

Not included in standard model

0.64 V and 10 V Range

Filter Type

LP4FP: 4-pole low-pass filter with programmable maximally flat pass band (Flat Mode) or linear phase (Pulse Mode) responses.

LP4FP (4-pole) and LP8FP (8-pole) low-pass filter with programmable maximally flat-pass band (Flat Mode) or linear phase (Pulse Mode) responses.

HP4F/LP4FP: 8-pole band pass filter. HP4F Flat Mode 4-pole high-pass filter cascaded with LP4FP 4-pole low-pass filter having programmable maximally flat pass band (Flat Mode) or linear phase (Pulse Mode) responses.

Filter Cutoff Frequencies

FX02: 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz, Bypass

Flat Mode:
2 Hz to 2.046 kHz in 2 Hz steps 2.2 kHz to 204.6 kHz in 200 Hz steps and Bypass

Pulse Mode:
1 Hz to 1.023 kHz in 1Hz steps .1 kHz to 102.3 kHz in 100 Hz steps and Bypass