48
To activate this function, configure the settings below:
Configure → Config 2 → External Ref. → Level
Figure 48 - External Reference Voltage Function
12.1.1
AC Couple
AC couple is selected by setting: Configure → Config 1 → Couple → AC. The reference
voltage is proportional to the Instrument voltage.
1 Vdc reference voltage = 30 Vac Instrument
NOTE: Input voltage cannot exceed 0 to 10 V in AC couple mode.
12.1.2
DC Couple
DC couple is selected by setting: Configure → Config 1 → Couple → DC. The reference
voltage is proportional to the source voltage.
±1 Vdc reference voltage = ±42 Vac source
NOTE: Input voltage cannot exceed -10 V to +10 V in DC couple mode.
This function is not supported when Configure → Config 1 → Couple → AC+DC.
12.2
Trigger In
To activate the Trigger function, follow the settings: Configure → Config 2 → External Ref.
→ Level.
This instrument has a trigger input on pin 17 of the digital IO interface. Trigger_in is high at
5 V and low at 0 V. The Instrument will respond to the falling edge of Trigger_in and
Ext_OnOff (external output control) according to the following control table and timing
diagram.
/Trigger_in
/Ext_OnOff
Result
Falling Edge
LOW
Instrument output STOP
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