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Stanford Research Systems / SRS SR620

Stanford Research (SRS) SR-620 - Universal Time Interval and Frequency Counter with Option 01 - High Stability Oven Timebase
  • Stanford Research Systems / SRS SR620 for sale
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$2295.00 Sorry, Out of Stock

Model: Stanford Research Systems / SRS SR620     Condition: Reconditioned

  • 25 ps single-shot time resolution
  • 1.3 GHz frequency range
  • 11-digit frequency resolution (1 s)
  • Statistical analysis & Allan variance
  • Graphical output to XY scopes
  • Hardcopy to printers and plotters
  • GPIB and RS-232 interfaces
  • Optional ovenized timebase

    Features and Specifications:

    The SR620 Time Interval Counter performs virtually all of the time and frequency measurements required in a laboratory or ATE environment. The instrument's single-shot timing resolution and low jitter make it the counter of choice for almost any application.

    Measurements:

    The SR620 measures time interval, frequency, pulse-width, rise and fall time, period, phase and events. Time intervals are measured with 25 ps rms resolution, making the SR620 one of the highest resolution counters available. Frequency is measured from 0.001 Hz to 1.3 GHz, and a choice of gates ranging from 1 period to 500 seconds are provided. The SR620 delivers up to 11 digits of frequency resolution in a 1 second measurement. It's suitable for measurement applications ranging from short-term phase locked loop jitter, to long-term drift of atomic clocks. All measurement modes are supported by a wide variety of flexible arming and triggering options.

    Histograms & Strip Charts:

    Unlike conventional counters that only have numeric displays, the SR620 Frequency Counter provides live, graphical displays of measurement results. Graphical data is available in three formats: a histogram showing the distribution of values within a set of measurements, a strip chart of mean values from successive measurements, or a strip-chart of jitter (standard deviation or Allan variance) values from successive measurements. Up to 250 strip chart points, or histogram bins, can be displayed.

    Both histograms and strip charts can be displayed on any oscilloscope with an X-axis input (see pictures), or can be plotted on an HP-GL compatible plotter or dot-matrix printer. Convenient cursors allow you to read the value of any data point in the histogram or strip chart. Autoscale and zoom features make it simple to display all, or any portion, of the graphs.

    Complete Statistical Calculations

    The SR620 can make measurements on a single-shot basis, or calculate the statistics of a set of measurements. Sample sizes from one to one million can be selected. The SR620 will automatically calculate the mean, standard deviation or Allan variance, minimum and maximum for each set of measurements.

    Reference Output

    A precision 50 % duty cycle square wave (1 kHz) is available at the front-panel REF output. The REF output can be used as a source of start or stop pulses for any of the SR620's measurement modes. For instance, the length of a cable connected between REF and the B input can be precisely determined by measuring the time delay between REF and B.

    Built-In DVMs and Analog Outputs

    Two rear-panel DVM inputs make measurements of DC voltages with 0.3 % accuracy (±20 VDC range). These values may be read via the interfaces or displayed directly on the front panel.

    Two DAC outputs continuously provide voltages proportional to the mean and the jitter of the measurement sample. These 0 to 10 V outputs can drive strip chart recorders, or they can be set to provide fixed or scanned output voltages.

    Built-In Auto-Calibration

    A sophisticated, built-in auto-calibration routine nulls insertion delays between start and stop channels, and compensates for the differential nonlinearites inherent in analog time-measurement circuitry. The auto-calibration routine takes about two minutes to perform, and should be run every 1000 hours of operation.

    10 MHz Reference

    The choice of timebase affects both the resolution and accuracy of measurements made with the SR620. SRS offers a choice of a standard timebase with an aging coefficient of 1 × 10-6/year, or an optional ovenized-oscillator timebase with only 5 × 10-10/day aging, and about an order of magnitude better short-term stability than the standard timebase. A rear-panel input lets you connect any external 5 MHz or 10 MHz source as a timebase.

    Computer Interfaces

    St

  • Power Cord
    Users Manual

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    Stanford Research Systems / SRS SR620

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    Requirements

    Our normal service includes 90 day warranty, all standard accessories and manuals, and restoration to "nearly new" condition. Discounts may be offered for reduced service levels. Please let us know which of these you would be willing to consider for the price discount.

    Reduced Warranty Period:
    Do you require manuals and accessories for the instrument?
    Will you accept an instrument with minor cosmetic and physical flaws if it operates properly?

    Are you willing to prepay your order by check or wire transfer to avoid credit card fees?

    Additional Info


    Equipment Offer Sent

    Your offer has been sent to our sales department for review. You should expect a response within one business day or less.

    Thank you for allowing us the opportunity to assist with your test equipment needs. We hope to earn your business.

    Error Sending Request

    We are very sorry but an error on the server is preventing your request from being processed.

    Please contact us via email or toll free at (800) 673-4102 and we will be happy to assist you with this request.

    We would also greatly appreciate it if you could provide us with this error code: 999

    Unable to Process Offer

    Your offer was received but we are unable to process it for the following reason:
    ???

    Please correct the issue indicated and resubmit or contact us via email or toll free at (800) 673-4102 and we will be happy to assist you with this request.