AC VOLTS
FREQUENCY
AC AMPS #1
AC AMPS #2
ZERO AC AMPS #1
ZERO AC AMPS #2
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To calibrate the VAAFH meter volts, Hz. and Amps, you will
need a separate reference test meter, AC RMS voltage and
current probe to measure AC RMS current. All reference meters
should have an accuracy of 1% or better. Also you will need a
stable voltage and load source. Load source can be lamps or
heaters. NOTE: These loads may drift a little so always re verify
measurements before adjusting calibration value. Calibration
should be performed after installation is complete.
Remove the cover from the VAAFH interface box to gain access
to its terminal block. This will be needed to measure AC voltage.
WARNING: High voltage is present at terminal block.
AC Volts
Apply AC mains and DC power to circuit. Do not apply a load
at this time. Measure the AC RMS voltage at TB1 terminals 9
and 10. Go to the sub-menu of the AC VOLTS calibration menu
and adjust the value up or down using the up or down buttons
so it matches the measured reading then press the
*
(accept)
button when done.
Frequency
Frequency does not typically need calibration. If frequency
needs calibration a frequency meter will be needed. Measure
the frequency at TB1 terminals 9&10. Got to the sub-menu of
the calibration frequency menu and adjust the value up or down
using the up or down buttons then press the
*
(accept) button
when done. WARNING: High voltage is present at
terminal block.
Zeroing AC Amps #1 and #2
Apply AC mains and DC power to circuit. Do not apply any
load at this time. Go to the sub-menu of the calibrate menu
and select either the ZERO AC AMPS #1 or #2. Zeroing amps
should be done before calibrating AC Amps.
AC Amps #1 and #2
Apply AC mains and DC power to circuit and apply a load.
Measure the AC RMS current through the load wires (#1 or
#2). Go to the sub-menu of the AC AMPS (#1 or #2) calibration
menu and adjust the value up or down using the up or down
buttons so it matches the measured reading then press the
*
(accept) button when done.
ATTENTION
:
Calibration should only be performed by
qualified personnel. Published accuracies are based on proper
calibration in conjunction with the 773-5385-0 meter interface. If
it is determined that calibration is needed, first ensure all sense
transformers are terminated properly to the meter prior
to calibrating.
If the Amps show a positive number when zero amps are
being passed through the current transformer it is possible to
automatically zero the amps #1 or amps #2 from the “Calibrate”
page. At low values of CT voltage there is a slight interaction
between the Zero Amps and the
Calibrate Amps and it may require you to re-calibrate slightly
after you have used the Zero Amps feature.
If the user accidentally zeros the amps #1 or amps #2 while
positive amps are actually being passed through the current
transformer, the meter will no longer display amps correctly
and the amps offset will have to be cleared. This is done by
holding the
q
key for more than 10 seconds while the meter
is displaying “NO YES NO NO” on the “Setup”
g
”Reset Alarm
Bell” page. This feature has been hidden to make it difficult to
do by accident.
Trying to calibrate the instrument when in simulate mode will be
problematic since the simulated inputs are constantly changing.
F) Calibration DC
Selecting the CALIBRATE DC menu brings up the following
sub-menu:
DC VOLTS
DC AMPS
ZERO DC AMPS
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DC Volts
Apply DC power to circuit. Do not apply a load at this time.
Measure the DC voltage at interface terminal block, across
(+)DCV and (-) DCV. Go to the sub-menu of the DC VOLTS
calibration menu and adjust the value up or down using the up
or down buttons so it matches the measured reading then press
the
*
(accept) button when done.
Zeroing DC Amps
Apply DC power to circuit. Do not apply any load at this time.
Go to the sub-menu of the calibrate menu and select: ZERO
DC AMPS. Zeroing DC amps should be done before calibrating
DC Amps.
DC Amps
Apply DC power to circuit and apply a load. Measure the DC
170 Cherry Avenue
West Sayville, NY 11796
www.kussmaul.com
Ph: 800-346-0857
Fax: 631-567-5826
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