These used oscillators are fully checked out and come with a fresh Calibration Certificate traceable to the NIST! Our Price! $500.00 Ea.
These oscillators are great for stand-alone Frequency Standards, Super-Accurate Time Bases for frequency counters and for most any critical timing application. Diagnostic outputs include: Atomic Resonance Lock Indication, Crystal Oscillator Voltage and Rubidium Lamp Voltage Monitor. Very simple to use, (comes with a schematic of the test fixture that we use to calibrate); minimum requirement is a supply voltage at appropriate current capacity and an indicator (we use an LED) of resonance lock. Also included is the optional Model EEK-10 Heat Sink, and the correct (used) mating output connector. Weight is only 2.2 lbs. Lehman Scientific warranties these units for a period of 6 months. Quantities available. These are available for shipment to the US and Canada. Other countries will be handled on a case to case basis.
NOTE: Very limited quantity still remaining for sale, discounted units available, please call for details. NIST-traceable calibration is no longer available.
|Output:||10MHz Sine Wave, 0.5Vrms into 50 Ohms|
|Signal to Noise:||>120dB in 1Hz band at more than 200Hz from nominal frequency|
|Power Requirements:||28VDC nominal (23 to 32VDC), 13W at 25 deg C, requires approx. 1.7Amp for first 10 minutes for warm-up|
|Long Term Stability:||<1 X 10E-10/mo. (typ. 3 X 10E-11/mo.)|
|Short Term Stability:||<5 X 10E-11 for 1sec. (typ. 2 X 10E-11)|
|Voltage Change:||<1 X 10E-10 from 23V to 32V|
|Temperature Change:||<1 X 10E-9 from -25 deg C to +65 deg C (typ. 5 X 10E-10)|
|Magnetic Field:||<1 X 10E-12/Am(-1)|
|Altitude:||<5 X 10E-13/mbar|
|Operating Temp. Range:||-25 deg C to +65 deg C|
|Storage Temp. Range:||-30 deg C to +70 deg C|
ESI Model SR 1050 High-Accuracy Resistance Transfer Standard, 1MW steps. (Inv #8182, 8183) Precision transfer measurements up to 11 MW relative to a single 10kW resistance standard can be obtained with the SR 1050 transfer standard. It consists of eleven 1MW resistors capable of being switched in series, parallel, and series-parallel combinations. Transfer Accuracy: limited only by short-term repeatability of resistance values, typically +/- 2ppm. Very good used condition, checked, guaranteed. Price: $1295.00
Guildline Model 4410 Portable DC Voltage Standard. This standard is designed for instrumentation laboratories which must maintain a knowledge of the absolute magnitude of the Volt to within a few parts per million of the National standard. Features: Eight independent outputs, four at 10 Volts and four at 1.018 Volts, simple and reliable operation, low drift, low noise, minimal leakage and line coupling, easily transported, long battery backup, low temperature coefficient, and it is acceptable for National Certification. The output terminals are of gold-plated copper to reduce thermal EMFs and also have custom-molded insulators of very high resistance and low moisture absorption. Silvered mica capacitors and high loss toroidal inductors are used to minimize RF interference. The precision resistors are wound of "Evenohm" wire from a single spool on selected mica cards in a single layer. Multiple resistors of a similar value are used to provide coherence of drift and temperature coefficient, even after temperature cycling. The annealing process and stress-relief after mounting ensure great stability with time and temperature. The reference modules are housed in a heavy cast aluminum oven enclosure controlled to 33 deg C. Great care is taken in routing the Teflon wiring to reduce temperature gradients. The multiple outputs are the most important feature since they provide greatly improved confidence. By a simple intercomparison of the four outputs, any perturbation in an output can be readily detected. In each of the four reference modules, eight precision reference elements are averaged to reduce drift, temperature coefficient and noise.
Specifications: Outputs: Four at 10V, four at 1.018V, Influence of Battery Voltage Limit (between the limits of 11.6V and 14V): below noise level, Noise (0.3 to 10Hz bandwidth): less than 0.1ppm RMS, Annual drift (each of the eight outputs): First year- less than -3 +/- 2 ppm, Second year- less than -2 +/- 2 ppm, Temperature Coefficient: less than +/- 0.04ppm/deg C, Isolation, AC: less than 120nA case to guard leakage current, Leakage Resistance (Outputs to Guard or Case): greater than 10E10 Ohms, Operation on Battery: at least 60 hours. We have two of these superior quality voltage standards in excellent used condition. Each is in current calibration with Calibration Reports (voltages certified to 7 decimal places for the 10V outputs, and 8 decimal places for the 1.018V outputs), and NIST-traceable Certifications. Each has a traceability book, which contains copies of the Calibration Certifications of each instrument used for for calibration. These units were shipped to us "hot" so the traceability is intact. Excellent used condition, checked, guaranteed. Price: $4995.00 each
Julie Research Laboratories DMR Decade Resistance Set. Consists of twelve nearly identical resistors in an oil bath. Designed to be used as a/an: Ultra-Precision Voltage Divider with voltage division up to ten times the basic set accuracy (Note: these decades are the same ones used in JRL's VDR-106 Primary-Standard Voltage Divider), Laboratory Resistance Standard for thousands of resistance values from 1/12R to 12R (where R is the basic resistor in the set), and Laboratory Measurements in conjunction with galvanometers, standard cells, etc. Specifications: Total Number of Individual Resistors- 12, Resistance of Individual Resistors- See Below, Absolute Accuracy- +/- 0.0015%, Stability, Absolute- better than +/- 0.0015%, Relative (resistor to resistor)- +/- 0.0005%, Voltage Rating between terminals of a resistor- 200Vmax.
DMR-104 12 each 1,000 Ohm resistors in set, used, checked- Price: $375.00
DMR-106 12 each 100,000 Ohm resistors in set, used, checked- Price: $375.00
Leeds & Northrup 4210 Thomas-Type One-Ohm Resistance Standard. The long-time standard of the industry. Specifications: The resistance is factory adjusted to one absolute ohm between potential leads. Limit of Error- 5 ppm (0.0005%) at 25 deg. C, Stability- Typically does not exceed 1 ppm/year under normal use, Current Rating- 0.1 A in stirred oil, Connections- Four-terminal current/potential type. Comes with the original case although the original foam insert has been modified. This resistor is in very good condition. Used, guaranteed. Price: $1650.00
Leeds & Northrup Model 6113 Current Shunt. (Inv #7635) A four-wire device; the current terminals will accept up to 4/0 wire. Resistance: 0.005 Ohms, Current Capacity: 100 Amps (estimated). There is a tag added by the last owner lising test data: 50A - 5.001034 mOhm / 100A - 4.998070 mOhm. We could not find any additional information about this shunt. Good used condition, guaranteed. Price: $200.00
Otto Wolff NF 250-4 a 11 "Resistor for Heavy Loads", 0.00001 International Ohms. If you are looking for the ultimate in stability, this resistor/shunt may satisfy your needs. This particular Standard Resistor was tested and certified by the PTR (Physikalisch-Technische-Reichsanstalt) in 1907! Resistors tend to become more stable with age, and this one should be extremely stable. For heavy loads Otto Wolff builds standard resistors of Manganin sheet, mounted in cylindrical brass containers which are filled with petroleum (mineral oil). If required, an electric motor can be installed to drive the built-in agitator, or an external refrigeration unit can be connected to circulate coolant through the built-in cooling coil. Specifications: Resistance: 0.00001 International Ohm, Typical Stability (for resistors monitored over a period exceeding 40 years): 0.001% to 0.002% per year, Temperature Coefficient: less than 15 X 10E-6/ degree C, Maximum Load (in still oil, can be increased by agitation or greatly increased by using external oil cooling): 7,000 Amperes. Resistor is shipped drained of oil. Includes shipping/storage case, shipping weight approx. 140 pounds. Good used condition, checked, guaranteed. Price: $7995.00
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