Amplifying The External Signal Input (Optional) - NF DP015S Instruction Manual

4.20

Amplifying the External Signal Input (Optional)

When you select EXT for the signal source, you can output the amplified external signal. Also, when
you select ADD for the signal source, you can output the amplified external signal after the internal
signal is added. For the specifications of the gain setting range and the input voltage range, see
10.22.3.
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 The gain setting value is retained for each of 100 V/200 V ranges.
 Within the same range, the same value is retained for the gain setting value, regardless of the
combination of the AC/DC mode and the signal sources (VCA, EXT, ADD).
 If the voltage after the external signal is amplified, or if the total voltage of the amplified
external signal and the internal signal exceeds ±220 V (100 V range)/±440 V (200 V range),
the output voltage is clipped at that value.
 If the signal source is set to EXT, the calculation is carried out in certain intervals by the
measurement function of this product. Therefore, the measurement operation cycle may
become inappropriate depending on the external signal frequency, resulting in the instable
measured value display. In that case, set [ADD] for the signal source and configure the settings
as below. When the signal source is set to [ADD], the measurement calculation is performed in
optimum interval for the frequency which is set for the internal signal source. This may solve
the instability of the measured value display.
 Set the frequency for the internal signal source so that it is equal to the one for the external signal.
 Set zero for ACV and DCV.
 You cannot amplify the external signal in the polyphase model or polyphase system. Also, you
cannot select EXT or ADD for the signal source.
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 Operation procedure
1. Input the signal to be amplified from the external signal input connector.
2. Press the [Osc] soft-key and select [2: Source], then : select [4:EXT] or [5:ADD].
DP Series

4.20 Amplifying the External Signal Input (Optional)

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