TESTO 770 - Measuring AC;DC Current

7 Carrying out a measurement
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7.2.1 Measuring A AC or A DC
7.2.1.1 Automac measuring mode
For every DC current measurement always zero the instrument with
[ ] before measuring.
1. Switch instrument on: set rotary switch to .
- The instrument switches on.
- testo 770-1/-2/-3 (0590 7703): The instrument is in AUTO A mode.
testo 770-3 (0590 3770): The instrument is in manual measuring mode.
Switch to automac measuring mode: press [ ] >2 s.
2. Enclose the live conductor and centre it in the jaws.
- The instrument automacally detects the A AC or A DC mode.
- The measured value is shown on the LC display.
7.2.1.2 Manual measuring mode
For every DC current measurement always zero the instrument with
[ ] before measuring.
✓ testo 770-1/-2/-3 (0590 7703): Instrument is in automac measuring mode
AUTO A
1. Exit AUTO A measuring mode: press [ ] <1 s.
2. Switch between A AC and A DC: press [ ] <1 s.
- The measured value is shown on the LC display.
Switch to automac measuring mode: press [ ] >2 s.
- The instrument is in automac measuring mode when AUTO is illuminated
on the LC display.