10 Volt 10 V VDC Voltage Reference Standard, Nulled to Fluke 732A or 732B

Description

We
are a USA manufacturer.
The
item for sale is
a
10.000000VDC
Precision Voltage Reference. It accepts 13.0VDC to 35.0VDC INPUT. The
OUTPUT is 10.000000 VDC ±0.0006% (±
6
ppm)
at 14.5VDC (+-0.
5
VDC)
INPUT. The other unit we have listed is the 10.000000VDC +-
0.000
2
%
.
The tighter absolute accuracy certification and the correspondingly higher price, are the only differences between
this unit and our
professional
product, the +-0.000
2
%
voltage standard. The typical error of the professional standard is +-2ppm. The +-0.0006% 10VDC standard (the one in
this
description) has (4) four nonmagnetic, gold-flashed, color-coded
banana-sockets w/binding posts for INPUT and OUTPUT connections. The
internal connections are soldered or bolted.
The
regulator IC is socketed for low hysteresis and to prevent heat
damage to the IC during manufacture. The main board is a low-hysteresis PCB
design, which prevents output drift due to mechanical stresses on the
regulator IC and other internal components. We integrate the
reference IC (TI REF102C) with (2) low-pass filters for AC
noise-suppression, shielding against induced thermoelectric effect,
and temperature compensation. We highly recommend the same leads be used by end users as are used during the final calibration procedure. Those are available here:
https://www.ebay.com/itm/253405049160
The
+-0.0006% standard can be power-cycled without affecting the absolute
accuracy (+-6ppm). Our testing indicates that under 100% up time at
10M Ohm load, long-term drift is < 3.0ppm/120 days, < 12.0ppm/15 months, < 21.0ppm/30 months. Drift in the powered down state is < 4.0ppm/year.
Theory
of Operation:
DC
input is fed to a capacitor configured with a die-embedded
precision resistor within the regulator IC. This shorts out AC
harmonic artifacts on the input side using a class 1
low-pass
filter
.
The regulator IC employs a laser-trimmed zener diode as a precision
voltage regulator and input (+) voltage feed to the on-die op amp.
The op amp operates in voltage-feedback mode with the gain set by a
voltage divider with an in-loop, precision external trimmer. The
6.7VDC produced by the zener reference is raised to an output that is
within +-5.0mVDC (0.05%) of 10.0VDC. The op amp output is cleaned of
high-frequency AC produced by the on-chip zener, by an output
low-pass filter that employs an on-die resistor and an external
capacitor. The resultant signal has a noise level of <=2uVp-p, which is easily filtered by most bench DMMs. The gain of the on-die op amp is trimmed by a potentiometer selected for its performance over time and temperature.
During
calibration, the manual adjustment of the op amp gain (output)
trim-pot, while nulling the output to a Fluke 732A or 732B Precision
DC Standard, traceable to the United States Institute of Standards
and Technology (NIST) and the Josephson Junction array at Fluke
Instrument Company in the USA , and then monitoring the calibration
on a daily-calibrated Agilent 3458A 8-1/2 digit multimeter, results
in unparalleled precision for a device in this market tier.
Secondly,
the unit employs passive temperature compensation (TC) using a
precision thermistor and heat-transfer coupling between the regulator
IC and the TC thermistor. The heat-transfer coupler lowers the
temperature
difference
over
time, between the regulator IC and the TC thermistor, which is the
same as saying it lowers the delta(deltaT/T) between the regulator IC
and TC thermistor. The thermistor disciplines the output gain to
change the device’s output voltage in an equal but opposite magnitude
to the temperature drift of the raw regulator IC, which provides:
(TdriftRegIC= ~(-)
2.5
ppm/degC)
+ (deltaVout=~(+)
2.5
ppm/degC)=0ppm
temperature drift between 17C and 26C (64F and 80F); 20-50% RH.
But
that is in an ideal world! In our situation the drift has been
reduced to <=+-6ppm over the range 17C-26C, which is 1/
4
the
typical
temperature
drift for the bare TI-REF102C IC.
The
passive temperature compensation relies on the fact that the TC
thermistor response is roughly linear over the range 17-26 degrees C,
negating the need for a power-hungry, electrically noisy onboard
oven! This produces a total current draw of 3.0mA, making the unit
usable with (2) 9V batteries wired in series (Duracell Procell or
Energizer Industrial recommended). The unit will run continuously for
at least two weeks on one set of batteries.
This
is a +-6ppm DC standard that fits in a pants or shirt pocket, weighs
about 3 ounces (84 grams), maintains its calibration across power
cycles, can be powered by a DC power supply (switching or linear, or
even a wall-wart) OR inexpensive 9V batteries, and drifts < 3.0ppm/120 days. Ripple rejection is: 111:1, or 11,000%. The internal noise created by the device is: 2uVp-p.
Among
the photos is a laboratory null voltage-offset setup. See
configuration data at the end of the listing.
All
units are nulled to a
characterized
732A or 732B DC standard. The +-0.0006% standard consumes roughly
45mW. From cold start the device settles in one-half hour. Warm
cycling requires several seconds to five minutes to resettle. Maximum
output load is 10.0 mA (1kOhm). The internal resistance (output
impedance) is 0.17 Ohms (170 milliohms). The unit is durable and
maintenance-free. It measures approximately 1.5″ x 2.25″ x
1.75″.
Calibration
is available any time for 35.00USD with one-day turn-around time.
Contact the seller (kaysert) on the eBay email system for calibration
service, or see our calibration listing. Test equipment and interconnect leads are not included.
Questions,
use the link below. Thank you for viewing our eBay.com listing!
The
following information may be of use to certain buyers. Null-offset
configuration data: The null setup (second photo) is as follows:
Fluke 732B OUTPUT (-)ground(-)
and
OUTPUT (-)ground(-) on the +-0.0006% standard
tied
together
.
Power Supply 14.5 Volt DC (+) and (-) to INPUT of the +-0.0006% DC
standard; (+) OUTPUT of Fluke 732B
and
(+) OUTPUT of +-0.0006% DC standard
to
DMM
(+) high
and
(-)
low.
Some
qualitative aspects:
this
device is a revolutionary voltage standard at an affordable price. If
you want to get your lab synced to the SI volt, our 0.0006% standard
provides one possible way to do it. The device does not require
continuous power. It will endure hard power cycling and retain its
absolute accuracy of +-6ppm. To date, the results show drift to be < 3.0ppm/120 days! Tests to determine the effects of relative humidity on the output voltage demonstrate a 17% RH range between 25% and 42% RH has no measurable effect on output voltage. Based on tests done with each unit, and also a number of unsolicited test results from outside sources, we have estimated the actual absolute error of our +-0.0006% DC standard to be < +-6ppm, with 95% confidence. The error at the calibration temperature (documented on the included calibration certificate) is between 30uV and 40uV (3ppm and 4ppm); confidence 95%.
A
good application:
In
many instances it is more desirable to ship our unit (shipping weight
= 4 oz.; 112 gm.) from place to place in a powered-down state, than
to ship a Fluke 732B in a powered-up state, because the accuracy
required for a particular application may be less than the 732B
provides, and shipping costs are much less.
We
furnish a traceable certificate with each unit. All units are
burned-in for a year or more before final calibration and shipment!
The
buyer can have this device calibrated 25 times for the cost of one
calibration of a Fluke 732B! Nothing else will get the SI volt in the
door at a lower cost. We have 100% positive feedback. We’ve sold
hundreds of voltage standards on eBay! They have been tested with the
finest instruments available. And we are continuously improving the
design and performance.
We
have two complete calibration labs that are checked against each
other four times per year. We’ve done seven years of R&D and
testing on this unit. The specification of +-6.0ppm is conservative.
Among
our buyers are four United States Government defense contractors, two
calibration labs, two University physics departments, an industrial
R&D lab, and buyers in the following nations:
USA
UK
Ireland
South
Africa
Slovenia
Latvia
Japan
Netherlands
Norway
Finland
Russian Federation
Germany
France
Spain
Canada
Italy
Australia
Denmark
Argentina
Sweden
Greece
Belgium
Austria
Bulgaria
Hungary
Switzerland
Brazil
China
Malta
Israel
Malaysia
If
you’re still not convinced, read the feedback comments!
Five
Star Seller. Great to deal with.
Everything
excellent.
Great
item! Fast shipping! Thanks.
Great.
No problems.
Just
as advertised; Good/Fast shipping; great seller. A+
A
metrology standard at a bargain price. Fast delivery. Friendly
expert seller. A++
Very
Fast Shipping, 1hr warm-up on Agilent 34461A & 0.0006% ref –
10.00000, Fantastic!
Item
appears to perform properly.
A+
Excellent service and good communications! Works as described! Thx!
alles
super, danke
Excellent
item. Fast shipment. Works as advertised. Good seller.
Item
received quickly, well packed, and as advertised. Highly Recommend
!!!!!
Perfect
– great instruction and delivery
Item
delivered very promptly in good operating condition.
As
described and good shipping. Thank you.
Fast
shipping, product as claimed. Great service.
Arrived
promptly as described
Thank
you for viewing our eBay.com listing. Questions, use the link above.