Parameter
Specification
Model
SWDRB
Manufacturer
SWARAJYA Instruments
Type
Programmable Decade Resistance Box
Resistance Range
1 Ω to 1 GΩ (1,000,000,000 Ω)
Resolution / Step Size
1 Ω
Decade Ranges
1 Ω, 10 Ω, 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ, 100 MΩ
Number of Decades
9 decades
Total Range
1 Ω to 1 GΩ (Selectable in 1 Ω steps)
Setting Method
Manual (Keypad) / Programmable (RS232 / USB Interface)
Display
2.8 inch TFT LCD – shows selected resistance, mode, and status
Manual Operation
4×4 Keypad for direct numeric input
Programmable Interface
RS232 and USB communication
Output Configuration
4-wire (Kelvin) terminals for high accuracy measurements
Basic Stability
±100 ppm (for 10 Ω to 10 MΩ)
 
Accuracy
 
– 1 Ω range
±0.2%
– 10 Ω to 10 MΩ
±0.1%
– 100 MΩ range
±0.5%
Temperature Coefficient
≤ 100 ppm/°C (typical)
Maximum Power Rating
0.5 W per decade (typical, derate at higher resistance)
Maximum Voltage
250 V DC (maximum safe operating voltage)
Operating Temperature
0°C to +50°C
Storage Temperature
-20°C to +70°C
Relative Humidity
Up to 85% RH non-condensing
Insulation Resistance
≥ 10 MΩ between circuits and case
Settling Time
< 200 ms after range change
Power Supply
230 V AC ±10%, 50 Hz
Dimensions (W × D × H)
350 × 400 × 85 mm
Weight
  8 kg
Enclosure Type
Metal (Al)body with anti-static powder coating
Front Panel
4-wire output terminals, TFT display, keypad, RS232 & USB ports
Protection
Overvoltage and ESD protection on communication and terminal lines
Calibration
Calibrated as per ISO/IEC 17025: 2017