User Manual

Connecting signals
Remove any conn
ections to the normal ALO terminal!
WARNING. Connections to the normal AMPS terminals can have high voltage.
To avoid erro
rs and a risk of electric shock, remove all connections to ALO.
EXT ALO and ALO are connected inside the PA3000 and so connections to AHI,
ALO, and A1A can have the same potential as EXT ALO.
3. Set up the P
A3000 to measure current from the EXT AHI and EXT ALO
terminals.
Press
.
Select
Inputs and press .
Select Shunt and press .
Select
External and press .
Press
to return to the measurement display.
4. Scale the measurement on the display.
The default scale is 1 V = 1 A.
In thi
sexamplewhereR=0.001Ω. The scaling factor is specified in
amps-per-volt, so in this case, the scaling factor is 1000.
To en
ter a scale factor for current:
Press
.
Sel
ect
Inputs and press .
Select Scaling and press .
Select
External Shunt and press .
Us
e
to clear the entry.
Enter the new scale factor (100).
Press
Press to return to the measurement display.
The PA3000 is now r eady to m ake measurements using an external shunt.
32 PA3000 Power Analyzer User Manual