User Manual

Connecting signals
Table 2: Signal inputs on rear panel (cont.)
Item Description
4
30 A current high connection (AHI)
5
Current low connection (ALO, common to both the 30 A and 1 A shunt)
6
1 A current high connection (A1A)
7
External shunt current input high (EXT AHI)
8
External shunt current input low (EXT A LO)
9
±15 V supply for powering external transducers
Voltage
Voltagesofupto600V
rms
can be connected directly to the red and black 4 mm VHI
and VLO safety sockets a t the rear of each measurement channel of the PA3000.
Current
The PA3000 has two built-in current shunts. The fi rst shunt allows currents of up
to 30 A
rms
,200A
pk
to be connected directly to the blue and gray 4 mm AHI and
ALO safety sockets at the rear of each me asurement channel of the PA3000. The
second shunt allows up to 1 A
rms
,5A
pk
to be connected directly to the yellow and
gra
y 4 mm A1A and ALO safety sockets also on the rear of each meas urement
channel.
External current inputs
The external current inputs accept a voltage of up to ±20 V
pk
that is proportional
to
the current being measured. This input allows a wide range of external current
transducers to be connected, from low milliamp current shunts to h igh amplitude
transducers. For e ach type of transducer, the PA3000 can be sc aled to read the
correct current. (See page 47, Inputs.)
The choice of cur rent transducer will depend on:
The current being measured, including peaks and transients.
The accuracy required.
The bandwidth required: Unless the waveforms are purely sinusoidal, a
bandwidth in excess of the fundamental frequency will be required.
Whether t here is DC curre nt present.
Convenience of connection – that is, using a clamp-on current transformer,
with jaws that open, for quick connection in a fixe d wiring harness.
The effect of the transducer on the circuit.
PA3000 Power Analyzer User Manual 29