Description
The ST-105 is a calibration box with standard ratios. It is used for calibration of any turn ratios measurement system. Housed in a rugged, waterproof case, it is very lightweight.
Features
- Housed in a rugged, lightweight waterproof case
- Standard Ratio to calibrate Turns Ratio Meters
- 2 years standard warranty
Specifications

Area of use:
Portable to use indoor and outdoor including heavy industrial electromagnetic environments
Enclosure:
Industrial high-impact plastic case
Max. permitted test voltage:
100VAC
Ratio ranges:
1:1 / 1:10 / 1:100 / 1:1'000 / 1:10'000
Operating temperature:
-10°C (14°F) to +30° C (86°F)
Storage temperature:
-20°C ( -4°F) to +70°C (158°F)
Degree of protection (closed door):
IP67, dust-tight and water immersion up to a 1-meter depth
Size:
L: 270 mm (10.62”) W: 246 mm (9.68”) H: 124 mm (4.87”)
Weight (instrument):
3.8 kg (8.3 lbs.)
Specifications are subject to change without notice
Accuracy

Measurement parameters
Nominal Ratios
Initial Accuracy (at 100kΩ Load)
1:1
± 0.001%
1:10
± 0.005%
1:100
± 0.03%
1:1'000
± 0.05%
1:10'000
± 0.2%