NF KP3000GS, Instruction Manual

Page: 163 / 279

4. Advanced Operation
PROGRAMMABLE AC/DC POWER SOURCE 144
4.12 Using AGC Function
The AGC (Automatic Gain Control) function calculates the ratio (calibration factor) of the output
voltage measured value (effective value) versus the output voltage setting value automatically and
continuously while this function is on, and multiplies the gain of the output amplifier by the
calculated value, intending to match the output voltage with the setting value. With this function, the
output voltage fluctuation can be suppressed even when the load is fluctuated. When the AGC
function is set to on, the icon
is displayed.
As the detected part of the output voltage calibrated by the AGC function, either the sensing input
terminal (the Remote sensing function is on) or the output terminal (the Remote sensing function is
off) can be selected. By combining the Remote sensing function with the AGC function, you can
compensate the voltage drop due to wiring to the load.
The AGC function can be set to on in the AC-INT, AC-VCA, AC-SYNC, DC-INT, and DC-VCA
modes. However, for the AC mode, it can be set to on only when the waveform is a sine wave.
When the AGC function is on, the waveform cannot be changed to other than a sine wave. When the
mode is changed to ACDC mode, when the signal source is changed to EXT or ADD, or when the
Sequence or Simulation function is selected, the AGC function is forcibly set to off. When the
Autocal function is on, the AGC function cannot be used.
For the specification of the AGC function, see
10.16
.
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Notes
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
If the output voltage setting is out of the "Operation range" shown in
10.16
, the calibration is
not performed while the AGC function setting remains on and the icon is still
displayed.
 If the difference is out of the "Calibration range" shown in 10.16 , the AGC function is forcibly
set to off, and the icon disappears.
 If the limiter operates while the AGC function is on, the AGC calibration is not performed.
When the limiter operation is completed, the AGC calibration restarts. If the protection
function is activated, the output is turned off, but the AGC setting remains on.
 The on/off setting of the AGC function is kept even if the output range is changed.
 When the AGC function is forcibly set to off, the settings saved in the System Setting Memory
are not updated.
 The AGC function updates the calibration factor continuously while the AGC function is on.
In contrast, the Autocal function continues to use the calibration factor obtained when Autocal
is turned on until Autocal is turned off. Therefore, in the AGC function, the output voltage is
calibrated properly even when the load is fluctuated, but there is the response time to reflect
the update of the calibration factor. Meanwhile, in the Autocal function, the output voltage
may not be calibrated properly when the load is fluctuated, but once Autocal is turned on,
there is no response time needed for calibration.
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