Stage 1
Test current flows from the external AC source into the device under test via an isolation relay.
CURRENT MEASUREMENT & TRANSFORMER OPTIONS
VOLTECH AC INTERFACE
HOW IS CURRENT MEASURED USING THE AC INTERFACE?
Stage 2
The current returns through another relay and passes through a current transformer (CT) fitted to the AC Interface.
Stage 3
The CT scales down the current so that the AT3600/AT5600 tester can measure it.
VOLTECH CURRENT TRANSFORMERS
CT 10-20 (Included in the Package)
Measurement Range: 50 mA to 10 A
Ratio: 1:20
Max Current: 10 A
Function: Scales larger currents down (e.g., 5 A → 0.25 A) so the AT tester can handle them
Default Settings: Most users can use the default 1:20 ratio in the AT software
Note: Very low currents (<50 mA) will also be scaled down and may be more affected by noise
CT 0.1-1 (Sold Separately)
Measurement Range: 1-100 mA
Ratio: 1:1
Purpose: Measures smaller currents (1–100 mA) while testing at higher voltages
Use Case: Ideal for precision testing where accurate low-current measurement is critical