HP E1431A VXI 8-Channel 25.6 kHz Digitizer

The HP E1431A digitizer is a C-size, 1-slot, register-based VXI module that simplifies system integration by implementing the entire measurement front end -- everything you need all in a single-wide C-size VXI module. These include, 8 differential/grounded inputs, AC/DC coupling, 4 mA constant current power for accelerometers, individual gains, programmable digital filters, simultaneous sample and hold, and separate 16-bit A/Ds per channel.

Data transfers to other VXI modules is over the VXI Local Bus. Use it with the HP E1562A/B Data Disk to attain transient captures with aggregate sample rates up to 2.62 MSa/s. That's 40 channels at 25.6 kHz bandwidth, or 80 channels at 12.8 kHz. Or use it with the HP E1485A/B signal processor module to create custom high-speed digital signal processing applications.

[ Features ]

25.6 kHz bandwidth/channel
16-bit A/Ds
Digital anti-alias filters
Built-in signal conditioning
High-speed Local Bus support
VXIplug&play-compatible with Windows^® 95/HP-UX drivers (See HP E2091D / E2094D product pages)

Note: Configuration software that allows you to easily select compatible interfaces, controller platforms, and VXI test system components is available on CD ROM. Order the "Test System and VXI Products Catalog and CD ROM" from the Test & Measurement Catalogs available at this web site.

[ Specifications ]

Frequency
Input frequency range: dc to 25.6 kHz
Frequency spans: 25.6 kHz to 0.39 Hz (2x steps)
Internal sample rate: 65,536 Hz to 1 Hz (2x steps)
External sample rate: <=65,536 Hz
Block sizes: 1 to 16,384 samples
Word sizes: 16- or 32-bit word transfers




Input
Full scale input ranges: 5 mVpk to 10 Vpk (1, 2, 5)
Input impedance (DC coupled):
	Differential: 2 M ohms nominal
	High side to chassis: 1 M ohms, 35 pF nominal
	Low to chassis (floating): 1 M ohms, 0.01 µF nominal
	Low to chassis (grounded): <90 ohms typical
AC coupling 3 dB frequency: <1 Hz
Common mode rejection ratio:



Frequency		DC Coupled	AC Coupled

<67 Hz			65 dB		   -
67 Hz to 1000 Hz	55 dB		   -
45 Hz to 1000 Hz	  -		45 dB



Amplitude over-range detection:
	Common mode overload: ±12.5 Vpk
	Differential mode overload: +3 dBfs nominal (at 100 kHz) 
	ADC overload: +3 dBfs (nominal) 
Residual DC after auto-zero: <=1% of Full Scale, or <=1 mVdc




Amplitude
Amplitude accuracy at 1 kHz: ±1% (±0.086dB) ±0.035% of FS 
Flatness relative to 1 kHz: ±0.5% (±0.043 dB)




Cross Channel Matching 
(in the same mainframe)
Cross channel magnitude: ±3% (±0.26 dB)
Cross channel phase match:



Frequency Span	Phase

25.6 kHz span	±1.0º
12.8 kHz span	±0.5º
1 kHz		±0.1º



Cross channel delay match:



Frequency Span	Delay

25.6 kHz span	±200 ns
12.8 kHz span	±100 ns
<1 kHz		±100 ns


Cross-mainframe time delay: 70 ns delay typical plus 6 ns per meter of cable




Dynamic Range
Resolution: 16 bits
FFT noise floor: <=-90 dB 
Note: Hanning window, 800 lines, 16 RMS averages

Spurious-free dynamic range: >80 dB
Channel to channel crosstalk: <-125 dB
Input noise level (>=100 Hz): <40 nV rms/squareroot of Hz




Trigger
Trigger modes: Input Channel (Same HP E1431A), Input Channel (Other HP E1431A)
Maximum trigger delay:
	Pre trigger: 16,383 sample periods
	Post trigger: >1 million sample periods




Transducer Constant Current Source
Current source accuracy: 4.5 mA, ±0.5 mA
Open circuit voltage: +24 Vdc
Harmonic distortion: <-80 dBfs
Intermodulation distortion: <-75 dBfs

Backplane Connector Shielding
To ensure compliance with RFI levels specified in standards EN55001 and
CISPR11, this product requires the backplane connector shields installed
in an HP VXI C-size mainframe.  Option 918 is available with the
purchase of a new mainframe; accessories, HP P/Ns E1400-80920 and
E1421-80920 (one kit permainframe), are available for retrofitting
existing HP mainframes HP E1401A/B and HP E1421A, respectively.

[ Ordering ]

HP E1431A	VXI 8-Channel 25.6 kHz Digitizer
   Opt 0B0	Delete manual set
   Opt 0B1	Add manual set
   Opt 1BP	Mil std 45662A calibration w/ test data
   Opt UK6	Commercial cal. certificate w/ test data

   Opt W01	Convert 3 year return to HP to 1 year onsite warrranty
   Opt W32	3 year customer return calibration service
   Opt W34	3 year customer return standards compliant calibration service
   Opt W50	5 year customer return repair service
   Opt W52	5 year customer return calibration service
   Opt W54	5 year customer return standards compliant calibration service

   E1400-80920	Shield, backplane connector
   E1421-80920	Shield, backplane connector kit

Trademarks:
Windows is a U.S. registered trademark of Microsoft Corp.

[ Key Literature ]