VREF-399 Spec Sheet
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Download PDF Product Flyer  ,
User Manual
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Product Description
The Symmetric Research VREF-399 is a precision voltage reference
suitable for general lab use and for applications such as the
calibration of high resolution A/D converters. The reference provides
excellent long term voltage stability with the same voltages returned
from one power on cycle to the next.
The voltage reference as a whole is floating. Any one of the outputs may be taken as ground, with the other outputs then distributed positive or negative from the grounded output. This results in a very flexible test instrument which can be used in a variety of applications.
Voltages are available on individual banana jacks, with each of the six jacks approximately one volt apart. A calibration tag with the voltages as measured at the time of production is included with each system. There are no trim pots to be adjusted, all voltages are permanently fixed.
The system is easy to use, requiring only power and connections to the reference banana jacks. A PDF User manual, desktop enclosure, power supply, banana plugs, and alligator cables are included with the "in the box" system.
Specifications Table
For more detailed specifications, please see the User Manual.
| VREF-399 Specs | ||
| Outputs: | 6 floating outputs in 1 volt increments | |
| Output Range: | -5v to +5v depending on ground location | |
| Short term output noise: | 5 microvolts peak to peak | |
| Thermal stability: | Max 2 ppm per degree C, typical 0.3 ppm | |
| Voltage Reference: | Heated buried zener, NSC LM399, AN161 | |
| Output Buffering: | Op amp, low noise, TI OPA2277 | |
| Power Supply Voltage: | Min 14.7, typical 17, max 30 vdc | FAQ note |
| Power Supply Current: | Operating 60 mA, warmup max 200 mA | |
| Board Dimension: | 2.50" W x 5.00" D | |
| Enclosure Dimension: | 2.50" W x 5.00" D x 1.25" H | |
| ROHS Compliance: | Compilant by exemption | FAQ note |
| Price: | See "in the box" table below | |
Documents and Software
These documents represent the complete specs for this product.
They can also be found on our
Downloads page.
| VREF-399 Documents & Software | ||||
| Category | Description | Rev | File | # bytes |
| Product Flyer | VREF-399 specs | 2012/01/01 | flyvref399.pdf | 103,175 |
| User Manual | VREF-399 user manual | 2010/01/15 | manvref399.pdf | 678,437 |
Price Table
The following items may be purchased individually or at a discount as a bundled "in the box" system. When purchasing a VREF-399 "in the box" system, the following are included:
| VREF-399 In The Box | ||
| Item | Description | Price |
| WITHCASE-VREF-399 | Precision voltage reference with 6 outputs and case | $175 |
| CABLE-VREF399-BANANA6 | Six stainless steel banana plugs with solder lugs | $14 |
| CABLE-VREF399-ANALOGOUT | Three 12" banana plug to alligator cables (24 gauge wire) | $20 |
| TRANS-WALL-12V-DC TRANS-EURO-12V-DC |
12 vdc, 500 ma wall transformer, 110 vac input (or substitute a 220 vac euro transformer on request) |
$15 |
| CD-VREF-399 | CD with PDF user manual | $1 |
| Individual item subtotal = | $220 | |
| "In the box" discount ( box contents photo ) | - $20 | |
| VREF-399 | Final price (how to order) = | $200 |
Options
Some users may want to consider these additional options:
| VREF-399 Options | ||
| Item | Description | Price |
| CABLE-VREF399-ANALOGOUT | Three more banana plug to alligator cables beyond those already "in the box" | $20 |
| SUB-TRANS-EURO-12V-DC | Substitute a 220 vac Euro style wall transformer | $0 |