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Part #$US
SSH-04399.00
SSH-08550.00
DC/DC Converter34.00
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SSH-xx

Simultaneous Sample and Hold Card

Features
  • This product has been discontinued. Please contact us for help in finding a suitable replacement.
  • Sample Up to Eight Analog Inputs simultaneously
  • Full Differential Inputs
  • Switch-Selectable Gains on a Per-Channel Basis
  • Full +10V range Capability
  • <200 pS Aperture Uncertainty Between Channels
  • <0.01 Microvolt per Microsecond Droop Rate
  • Input Overvoltage Protection to 24 Volts
In order to minimize size and cost, most PC-based data acquisition systems employ only one A/D converter with analog multiplexers controlling signals to the converter. Thus, inputs must be read sequentially and data representing the inputs are skewed in time by the time required for A/D conversion. Use of simultaneous sample and hold techniques minimizes that time skew by capturing the inputs simultaneously. This is useful in applications such as transient analysis, frequency analysis, phase-sensitive measurements, and oscillographic recording and display.

Models SSH-04 and SSH-08 install external to the computer and contain four and eight identical circuits respectively. Each circuit consists of a differential-input, programmable-gain amplifier and a sample and hold amplifier. Outputs at the sample and hold amplifiers are coupled through a multiplexer to a common buffer amplifier. The unit can sample differential inputs simultaneously and couple analog outputs to an AD12-8, analog-to- digital converter card. These units can also be used with AD12-16 and AD12-16F if a cable adaptor model CA37-1 is added at the I/O connector of the A/D converter card. For applications that require more than eight channels, multiple SSH-08's can be connected in parallel for as many as 64 analog channels. Sample time is 1 microsecond and aperture uncertainty is 200 picoseconds. Each analog input is overvoltage protected for 28V continuous and spikes to 50V. Analog inputs to be sampled connect via screw terminals. The input circuit is a precision instrumentation amplifier with full differential input, low offset, and very low bias current. Full power bandwidth is 300 KHz and amplifier gain is switch selectable in the range of 1, 10, 100, 200 and 500. Also, a special gain range is possible by means of a user-set resistor installation. Outputs to the A/D converter are via DB37 connectors. An on-board DC-DC converter provides isolated power.

The sample and hold amplifier used is a fast precision integrated circuit with an internal capacitor and accuracy compatible with 12-14 bit conversion requirements. Sample/hold commands can be derived from external TTL signals or by a variety of user-defined signals generated in software and coupled from the A/D card through the interface connector.

Additional circuits on the card provide control of sample/hold commands. Commands may be applied from either external sources or, under program control, via counters in the A/D card. A mode control DIP switch on the card selects the initiation method. Methods available include single sample, and timed control of multiple samples. Timed control of multiple samples is useful in rotating machinery applications.

Specifications

  • Inputs: Differential, high-voltage protected to 28V continuous. Maximum Common Mode Voltage: ±10V
  • Gain Selectable (per channel): 1, 10, 100, 200, 500 plus one user selectable gain setting.
  • Slew Rate: 10 V/µSec.
  • Settle Time to 0.01%:
    Gain1: 5 µSec.
    Gain 10: 3 µSec.
    Gain 100: 4 µSec.
    Gain 500: 30 µSec.
  • Gain Errors:
    Gain 1: 0.02%
    Gain 10: 0.5%
    Gain 100: 0.7%
    Gain 1000: 1.0%
  • Gain Non-Linearity:
    Gains 1 and 10:±0.01% of full scale.
    Gain 100: ±0.02% of full scale.
    Gain 1000: ±0.04% of full scale.
  • Acquisition Time: <1 microsecond to 0.01% for a 10 volt step input.
  • Aperture Delay: <10 nSec (sample to hold switch time).
  • Aperture Uncertainty: < 200 pSec.
  • Output Droop Rate: 0.01 µV/µSec typical, 1 µV/µSec max.
  • Interchannel Isolation: -80 db.
  • Hold Mode Offset Temp. Coefficient: 10 microvolt/°C.

Power Required

  • With optional DC-DC Converter: (Required when using ±10V output) +12 VDC at 330 mA and +5 VDC at 700 mA.
  • Without DC-DC Converter: +12 VDC and -12 VDC at 125 mA each and +5 VDC at 40 mA.
  • Power Supply Common Mode Voltage Rejection: > 60 db.

Size

  • 8" long, includes standoffs and can be installed in T-Box enclosure.

Environmental

  • Operating Temperature Range: 0° to 60°C.
  • Storage Temperature Range: 50° to +120°C.
  • Humidity: 0 to 90% RH, non-condensing.
Regulatory Compliance
Declaration of Conformity, and Test Reports are on file. Users must use appropriate shielded cables.


 
ModelPrice (USD)
SSH-04399.00
SSH-08550.00
DC/DC Converter34.00


Available Reference Manuals

Available Software Downloads

Further information about available ACCES Software:

Drivers And Operating Systems
What drivers and other support we provide for various operating systems.

Setup Programs, Samples, And Utility Software
A description of the software package that comes with each ACCES card.

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

Custom Software Services
A description of some of our custom software offerings. Did you know we offer free programming services to qualifying customers?

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