TCPA300 and TCPA400 Performance Verification
Making DC Curr
ent Loops
You need to construct simple current loops to complete some tests for the
amplifiers. The current loops are also used in the DC gain accuracy tests for
the p robes.
5-Turn DC Current Loop
Construct the loop using a cylindrical form approximately 3 inches in diameter:
1. Wind exactly 5 turns of #18 coated wire around the form.
2. Scrape about a half-inch of coating off of the ends of the wire.
NOTE. Ensure that the current loop has exactly 5 turns. A significant error will
re sult for each turn variance from 5 turns.
The 5-turn DC current loop is also used in the current probe performance
verification and adjustment procedures.
50-Turn DC Current Loop
Construct the loop using a cylindrical form approximately 3 inches in diameter:
1. Wind exactly 50 turns of #13 coated wire around the form.
2. Scrap
e about a half-inch of coating off of the ends of the wire.
NOTE. Ensure that the current loop has exactly 50 turns. A significant error will
re sult for each turn variance from 50 turns.
The 50-turn DC current loop is also used in the current probe performance
verification procedures.
4 TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Service Manual
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