USING VOLTAGE AND CURRENT TRANSDUCERS
Page 22 © Voltech 2010 PM1000+ Power Analyzer User Manual
Use the delete key to clear the entry.
Type the new scale factor (100)
Press OK
Press „MENU‟ to return to the measurement display.
The PM1000+ is now ready to make measurements using a CT.
3.3. TO CONNECT AN EXTERNAL RESISTIVE SHUNT:
Using resistive shunt is a straightforward method of extending the current measuring
range of the PM1000+. The shunt resistor is connected in series with the load and the
voltage across the shunt is directly proportional to current.
That voltage may be connected directly to the External Current Inputs of the PM1000+.
For example, a 1milli-ohm shunt is to be used to measure 200A rms.
1. Check the voltage that will be generated is suitable for the PM1000+
V = I x R (Ohm‟s law)
V
shunt
= I x R
shunt
V
shunt
= 200 x 0.001 Ohms
V
shunt
= 0.2V
This is well within the 1V rating of the PM1000+‟s External Current Inputs
2. Connect the shunt in series with the load and to the EXT-HI and EXT-LO inputs
as shown.
To Next Page
Loading...
