External Signal Input; External Synchronous Signal Input (Signal Source Sync Only); Voltage Setting Signal Input (Signal Source Vca Only) - NF DP420LS Instruction Manual

11.22 External Signal Input

The external signal input works differently depending on the selection of the signal source.

11.22.1 External Synchronous Signal Input (Signal Source SYNC only)

This is the signal to synchronize the frequency of the internal signal source with the one of the
external signal source.
When the signal source is SYNC, you can select whether to synchronize with this external signal
input or the power input frequency of this product. When synchronizing with the power input
frequency, no signal input is needed.
Synchronization signal source switch
Synchronization frequency range
Input terminal
Input impedance
Threshold of input voltage
Minimum pulse width
Nondestructive maximum input voltage

11.22.2 Voltage Setting Signal Input (Signal Source VCA only)

This is the signal to set the output voltage amplitude of the internal signal source (DC input).
Output voltage (Vpk) = Voltage setting signal (Vdc) x Gain (Vpk/Vdc)
Example 1) For the AC mode, signal source = VCA, the gain of 100.0, and the voltage setting
signal input of 1 Vdc, the output voltage is 100 Vpk
Example 2) For the AC mode, signal source = VCA, the gain of 141.4, and the voltage setting
signal input of 1 Vdc, the output voltage is 141.4 Vpk(=100 Vrms)
Gain setting range
Setting resolution
Gain accuracy
Input terminal
Input impedance
Input voltage range
Nondestructive maximum input voltage
*48: In the polyphase system, the setting is common to all the phases.
*49: In the DC mode or 45 Hz to 65 Hz, the gain is the factory default, the rated output voltage, and
no load.
DP420LS/DP480LS
Single
External synchronization signal (EXT)
or Power input (LINE)
40 Hz to 500 Hz
BNC connector (rear panel, unbalanced)
1 M
TTL level
500 s
10 V
Single
*48 100 V range: 0.0 to 220.0 times
200 V range: 0.0 to 440.0 times
*48 0.1
*49 5 %
BNC connector (rear panel, unbalanced)
Also used as the external synchronization signal input
1 M
2.2 V (A/D resolution: 10-bit)
10 V
11.22 External Signal Input
Polyphase system Factory default
LINE
Polyphase system Factory default
100
200
253