Helios PD2-6400 High Voltage & High Current Meter
Instruction Manual
41
Math Function (
nmath
)
Within the
Math
menu is the power function, P = I*V,
available on this meter to calculate the apparent
power. This math function is a combination of input
channels A and V, and will display when channel P is
selected in the
Display
menu. The actual function, as
calculated by the meter, is P = ( [A*V] + C )*F, where
C is the
adder
constant and F is the
Factor
constant.
Math Constants (
Const
)
The
Math Constants
menu is used to set the
constants used in channel P math. The math function
includes input channel A and V, as well as the adder
constant C, and factor constant F.
The
Adder
constant (C) may be set from -99.999 to
999.999.
The
Factor
constant (F) may be set from 0.001 to
999.999.
Low-Value Cutoff (
CutofF
)
The low-value cutoff feature allows the meter to be
programmed so that any noise picked up from nearby
transformers or other electric devices that cause an
otherwise zero reading to fluctuate always displays
zero on the meter. The cutoff can be disabled to
display negative values.
The cutoff value may be programmed from 0.1 to
999,999. The meter will display zero below the cutoff
value. Programming the cutoff value to zero disables
the cutoff feature. The cutoff function is independent
for Channel A and V.
Analog Output Programming
(
AoutPr
)
The
Analog Output Programming
menu is used to
program the behavior of the 4-20 mA output. The
following parameters and functions are programmed
in this menu:
1. Source: Source for generating the 4-20 mA
output
2. Overrange: Analog output value with display in
overrange condition
3.
Underrange: Analog output value with display in
underrange condition
4. Break: Analog output value when current input
break is detected
5. Max: Maximum analog output value allowed
regardless of input
6. Min: Minimum analog output value allowed
regardless of input
7. Calibrate: Calibrate the internal 4-20 mA source
reference used to scale the 4-20 mA output
Analog Output Source
The analog output source can be based on either of
the input channels (Ch-A, Ch-V), the power channel
(Ch-P), maximum stored value of either input channel
(Hi-A, Hi-V), minimum stored value of either input
channel (Lo-A, Lo-V), relay set points, or the Modbus
input.
Analog Output Calibration
To perform the analog output calibration, it is
recommended to use a milliamp meter with a
resolution of at least 0.1 µA to measure the output
current. The values saved internally during this
procedure are used for scaling the 4-20 mA output in
the
Setup
menu.
Analog Output Calibration
Procedure
1. Wire the PD2-6400 4-20 mA output to a current
loop that includes a power supply (internal or
external 12 to 24 VDC), and the mA input on the
digital meter. See
2. Turn on all devices. Allow for a 15 to 30 minute
warm-up.
3. Go to the Advanced Features menu, and
navigate to the Analog Output Programming
(
AoutPr
)/Calibration (
Calib
) menu and press
Enter
.
4. The display will show
4 nmA
. The PD2-6400 mA
output should now be close to 4 mA. Press Enter
and the display will show 04.000. Enter the actual
value read by the digital mA meter and press
Enter
.
5. The display will show
20 nmA
. The PD2-6400 mA
output should now be close to 20 mA. Press
Enter
and the display will show 20.000. Enter the
actual value read by the digital mA meter and
press
Enter
.
6. The meter will now calculate the calibration
factors and store them.
7. Press
Menu
to exit and return to Run mode.
