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Instrument Controls and Indicators
1. Positive (+) terminal
2. GUARD terminal
3. Negative (-) terminal
4. 9-pin remote control socket
5. USB device interface
6. Navigation/OK buttons and select burn/breakdown
7. TEST button with associated HV warning lamp
8. Backlight button
9. Range rotary switch
10. Save button
11. Test mode rotary switch
12. LED indicating line power / mains
13. Filter button
14. Display
15. Power socket
16. Functional earth terminal – S1-1568 only