TESTO 770 - Power Measurement (testo 770-3 only)

7 Carrying out a measurement
21
7.4.2 testo 770-3
7.4.2.1 Automac measuring mode
Automac detecon for resistance and connuity.
Change to manual measuring mode for diode test and capacitance.
1. Switch instrument on: set rotary switch to .
- The instrument is switched on.
2. Connect test leads: black test lead to black jack, red test lead to red jack.
Then connect test leads to the test object.
- The instrument is in AUTO RCDC measuring mode.
- The instrument detects resistance and connuity and automacally adjusts
the measuring range.
- The measured value is shown on the LC display.
7.4.2.2 Manual measuring mode
3. Disable AUTO RCDC measuring mode: press [ ] <1 s.
4. Switch between between resistance, connuity, diode test and capacitance:
press [ ] <1 s.
- The measured value is shown on the LC display.
> Switch back to AUTO mode: press [ ] >2 s.
7.5 Power measurement (testo 770-3 only)
For the power measurement, two measurements are carried out at the same me.
The voltage of the measurement object is measured via the COM jack, V input
jack and using two test leads. The current of the measurement object must be
measured using the clamp meter. From these two factors, the instrument
automacally calculates the dierent types of power, as well as the power factor.
For the DC power measurement always zero the instrument with
[ ] before measuring.
1. Switch instrument on: set rotary switch to .
- The instrument switches on.
- The instrument is in the mode for power measurement with alternang
current/voltage.
2. Enclose the live conductor and centre it in the jaws.