The 2724A Resistance Standard is a fully variable programmable resistance standard that provides over 10 million resistance values ranging from 100 micro-ohms to 11 gigohms. The unit accomplishes this feat by using microprocessor technology coupled with an extremely high resolution A/D converter to "synthesize" the programmed value of resistance. Basic Accuracy to 7 ppm Short Term Stability to 2 ppm (10 ppm-1 yr) Calibrates 7 1/2 digit DMMs Two/Four Terminal.
Valhalla Scientific 2724A Specs
| Output Configuration |
Selectable 2-wire or 4-wire low thermal EMF terminals; front and rear provided in parallel |
| Leakage Current |
±2pA ±0.2pA/°C |
Maximum Noise and Thermals
(4-wire mode) |
| |
DC to 10Hz |
10Hz to 10kHz |
| Standard Mode |
±4µV |
±40µV |
| Fast Mode |
±30µV |
±300µV |
| CPR Mode |
±2µV |
±20µV |
|
| Dimensions |
89mm (3.5")H x 432mm (17")W x 432mm (17")D |
| Weight |
7.2 kg (16 lb) net, 10.5kg (23 lb) |
| Power Requirements |
115 or 230VAC ±10% @ 50 to 400Hz; 50VA max |
| Temperature |
Operating: 0°C to 50°C Storage: -30°C to 70°C |
| Humidity |
Up to 70% RH at 40°C (non-condensing) |
Resistance
Range (Ω)
|
Accuracies Resistance (ppm of setting)
|
Stability
(DC to 1Hz)
|
| 90 Days |
180 Days |
360 Days |
24 Hour |
1 Year |
| 0 to 120 |
±7ppm ±2mΩ |
±9ppm ±3mΩ |
±11ppm ±4mΩ |
±2ppm |
±10ppm |
| .12K to 1.2K |
±7ppm ±7mΩ |
±9ppm ±9mΩ |
±11ppm ±11mΩ |
±2ppm |
±10ppm |
| 1.2K to 12K |
±7ppm ±50mΩ |
±9ppm ±63mΩ |
±11ppm ±75mΩ |
±2ppm |
±10ppm |
| 12K to 120K |
±7ppm ±500mΩ |
±9ppm ±630mΩ |
±11ppm ±750mΩ |
±2ppm |
±10ppm |
| 120K to 1.2M |
±12ppm ±5Ω |
±15ppm ±7Ω |
±18ppm ±9Ω |
±2ppm |
±10ppm |
| 1.2M to 12M |
±20ppm ±50Ω |
±25ppm ±63Ω |
±30ppm ±75Ω |
±2ppm |
±10ppm |
| 12M to 120M |
±40ppm ±1KΩ |
±50ppm ±1.5KΩ |
±60ppm ±2KΩ |
±500Ω |
±50ppm |
| .12G to 1.2G |
±0.1% ±50KΩ |
±0.15% ±63KΩ |
±0.2% ±75KΩ |
±50KΩ |
±50ppm |
| 1.2G to 11G |
±0.1% ±5MΩ |
±0.15% ±6.3MΩ |
±0.2% ±7.5MΩ |
±5MΩ |
±0.05% |