User Manual

The menu system
The following s
elections are a vailable:
Volts. This is the default selection; the phase is calculated with respect to the
voltage signa
lonthefirst channel in the group.
Amps. Phase is calculated with respect to the current signal on the first
channel in t
he group.
External Frequency 1 / 2. Phase is calculated w i th respect to the external
input signa
l.
Frequency Range.
There are
three frequency ranges:
>10 Hz. This is the default selection.
1 – 100 Hz
0.1 – 10 Hz
If the fundamental frequency is greater than 50 kHz, then the range should be set
to >10 Hz. For measurements where the fundamental is below 50 kHz, the range
of >10 Hz is recommended, especially at low signal levels. The 1 – 100 Hz and
0.01 – 10 Hz ranges should only be used with slow signals; using these ranges
slows
the update rates.
Bandwidth
The bandwidth is set on a per-group basis. Setting the bandwidth to low applies
a 10 kHz, two-pole filter to the voltage and c urrent channel inputs. High is the
def
ault selection.
Scaling
Scaling adjusts the scaled output of transducers, such as current transformers, so
th
at the true measured current is displayed on the power analyzer. The scaling
factor affects every measured value related to the input to which it is applied. The
maximum scale factor is 100000; the minimum is 0.00001. The default selection
is 1.0000 for all scale factors.
Volts scaling. Enter the scale factor of the transducer. For example, a 100:1
voltage transformer is used to measure 15 kV. The output of the transformer is
15000 / 100 = 150 V. Enter the scale factor 100, and the power analyzer will
display 15,000 V.
Amps scaling. Enter the scale factor of the transducer being used. For example,
the Tektronix CL1200 produces 1 A for every 1000 A flowing in the opening of
the CL. It is a 1000:1 current transformer. Enter the scale factor 1000 and the
power analyzer will display the correct current.
Scale factor = Transducer Input C urrent ÷ Transducer Output Current.
52 PA3000 Power Analyzer User Manual