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Using Scanner Interface
Electrical Characteristics
Figure 9-4
Circuit diagram of the scanner interface output signals
e4981aue0045
Input signal
Each input signal is connected to the cathode side of the photo coupler LED.
The anode side of the LED is connected to the drive source voltage.
Table 9-4
and
current flowing through the LED depends on the setups of the drive source
voltage, and the external trigger (EXT_TRIG) signal resistance setup switch (S1,
S2).
The S1, S2 switches belongs to electrical switches that can be control by the
following SCPi command :SYSTem:SCANner:TRIGger:VOLTage <para>
Table 9-4
Electrical characteristics of the scanner interface input signals
162
Interface Board (E4981-66537)
shows the electrical characteristics of the input signals.
Figure 9-6
show the circuit diagram of the input signals. The amount of
Input vol tage [V]
Input signal
LOW
/CH0 - /CH7,
/CH_VALID
0 - 1
EXT_TRIG
The current can be calculated by the following formula:
I = (DCV-Vf-Low)/R
Low = 0 V
EXT_TRIG Vf = 1.3 V (typical)
\CH0 -\CH7 \CH_VALID Vf = 1.1 V (typical)
S canner
interface
connector
/INDEX
/EOM
COMMON
Input current (LOW) [mA] (typical)
Pull-up source vol tage: EXT_DCV
HIGH
5 V
4.8
EXT_DCV
3.7
Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter
Figure 9-5
9 V
15 V
13.3
17.0
4.7
6.0
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