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.
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| 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
General Radio Type 1562-A Sound
Level Calibrator. (Inv #7629) The 
Type
1562-A is a vonvenient and accurate self-contained device for
checking the calibration of sound measuring instruments. It can
calibrate Type 1551, 1565, 1558-A, 1558-BP, 1564, 1525 Sound-Level,
Octave Band Noise Analyzer, Sound and Vibration Analyzer, Dound
Data Recorder, and any instrument that uses a Western Electric
640-AA Laboratory Standard Microphone. The calibrator can accomodate
1-1/8" microscopes and 1" and 1/2" with the included
adapters. Specifications: Acoustic Output: 125, 250, 500, 1000,
and 2000Hz +/- 3%, Sound Pressure Level: 114 dB re 20uN/m squared. This calibrator uses a round-style
9V battery that is readily available, however, if you choose,
we will adapt it to use the modern rectangular 9V battery at no
extra charge. The case shows some wear. Good used condition, checked,
guaranteed. Price: $395.00
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-105 12 each 10,000 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 4223-B Reichsanstalt 0.001 Ohm Standard Resistor.
This standard is commonly used for very
accurate current measurements and as a four-terminal comparison
standard for low-resistance measurements. Specifications- Current
Rating: 100 Amperes, Wattage Rating: 10 Watts, Limit of Error
from Nominal: +/- 0.005%, Accuracy of Measured Value (at time
of manufacture) +/- 0.002% at 30 Amps, +/- 0.05% at 100 Amps,
Stability: 20 ppm/yr. These resistors are very rare finds! Used,
checked, guaranteed. Price: $1495.00
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
Transmation Model 1045 Digital
Calibrator and Signal Indicator. (Inv 
#7765,
7766, 7767) The Model 1045 can simulate and/or measure current
or voltage signals that fall within the millivolt, volt, and milliamp
ranges as indicated in the chart below. Input and Output signal
values are indicated on the front-panel four-digit liquid crystal
display. Each signal type has a separate set of terminals for
input and output connections permitting simultaneous input and
output operations. Extremely versatile, the Model 1045, in addition
to simultaneous process signal simulation/measurement, can simulate
a two-wire transmitter. It can also measure the output of a two-wire
transmitter while simultaneously powering the transmitter from
the 1045's own 24 VDC supply. Very good used condition, brand-new
Nicad battery packs, includes case and charger, checked, guaranteed.
Price: $765.00
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