User manual

User Manual – Rev B FCS Series II
6.4 Output Calibration
The output calibration is performed automatically when the measurement calibration takes
place. As such, there is no need to perform this calibration again. The output calibration
coefficients may be viewed by selecting the OUTPUT CAL screen.
Output gain is set at the factory and the output calibration coefficients are pre-set. They is no
need to change the factory default settings unles he fo wing s occu
1 one or mo s as ser e a
2 curren d. (CI P 703-1
3. Replacem
If the output gains are found to be out of toleranc eed t be adjus d. This requires
r f the top cover and s e do ied rvice per nnel. In that ca e,
refer to the non-routine gain calibration section.
The factory output calibration coefficients are shown in the table below.
s any of t
a a
llo condition
c
rs:
. Replacement of r re amplifie result of vic tion.
. Replacement of the t limit boar /N 7004- )
ent of the controller board. (CI P/N 7004-715-1)
e, they n
ne by qualif
o
se
te
so semoval o hould only b
Output
Phase
OUTP CAL value Current Limit Board
Adjustment Pots
A or 1 R1 450
B or 2 R2 450
C or 3 R3 450
Table 6-2: Output Calibration Coefficients - Factory Defaults.
6.5 Phase Offset Calibration
The phase offsets for phase B and C can be calibrated using the OUTPUT CALIBRATION
screen. The same calibration can be done over the IEEE-488, RS232C, LAN or USB bus if
needed. Refer to the Lx/ Ls programming manual (P/N 7004-981) for command syntax on bus
calibration.
Phase offset calibration requires a phase meter for reference. See section 6.1 for recommended
equipment list.
For front panel calibration, proceed as follows.
1. Program the output frequency to 400 Hz.
2. Select the phase to be checked/calibrated (Phase B or C) using the PHASE key. Phase
A calibration is only relevant if the FCS unit is used in External Sync or LKS mode. In
that case, phase A offset is with respect to the external reference signal.
3. Program full-scale voltage and measure phase angle between phase A and B or A and
C using a phase meter.
4. Press the MENU key several times to display OUTP CAL, then press the ENTER key.
5. Again you must enter the password, which will be the value for the highest voltage
range and press ENTER.
6. Press the ↓ key to point to the PHASE OFST value. This will be the phase calibration
value for the phase selected.
7. Adjust the calibration value as needed while monitoring the external phase meter
reading so the output phase angle is calibrated. Press the ENTER key to save the
calibration.
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