NSCL maintains the following standards as the reference measurement standards of DC voltage, DC current, resistance and capacitance for Syria and for the dissemination of the related units:
- Two Fluke 732A as the reference measurement standards of DC voltage. The back to back method, using a digital voltmeter, is used to perform measurements.
- A current source serially connected to a set of Yokogawa 2792 resistors as the reference measurement standard of DC current, where a reference digital multimeter (Fluke 8508A) is used to measure the dropped voltage.
- A set of five double-wall standard resistors Yokogawa 2781 as the reference measurement standard of resistance, where a current comparator resistance bridge (Guildline 9975) is used to perform measurements.
- A set of four-dry nitrogen capacitors GR 1404A and GR 1404B as the reference measurement standard of capacitance, where a capacitance measuring assembly bridge (GR 1620-AP) is used to perform measurements.
| Measured quantity/Calibrated item |
Range |
Expanded uncertainty (K=2) |
| DC voltage sources |
| Standard cells |
1.018 V |
1.9 ppm |
| Solid state voltage standards |
1 V, 1.018 V, 10 V |
(1.3 to 2.1) ppm |
| DC voltage calibrators |
1 mV to 1000 V |
(2.4 to 830) ppm |
| DC voltage meters |
| Standard DC voltage meters |
100 mV to 1000 V |
(2.8 to 17) ppm |
| DC voltage meters |
1 mV to 100 mV |
(17 to 830) ppm |
| DC current |
| Sources |
100 μA to 100 A |
(16 to 300) ppm |
| Measuring instruments |
100 μA to 100 A |
(14 to 300) ppm |
| DC resistance |
| Fixed standard resistors and resistance boxes |
10 mΩ to 10 MΩ |
(8 to 30) ppm |
| Current shunts |
1 mΩ to 10 mΩ |
(22 to 300) ppm |
| Capacitance |
| Fixed capacitors and capacitance boxes |
100 pF to 10 μF at Freq 1 kHz |
(20 to 380) ppm |
| Capacitance bridges & capacitance meters |
1 pF to 10 μF at Freq 1 kHz |
(110 to 380) ppm |
| Dissipation factors |
> 1 ∙ 10-6 to 1 at Freq 1 kHz |
1000 ppm . tan δ + 50 ppm |
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