Keysight E4981A 120 Hz/1 kHz/1 MHz Capacitance Meter 155
Using Scanner Interface
Using Multi-correction Function
Making a selection using the scanner interface
To select a channel through the scanner interface, use the /CH0 - /CH7 and
/CH_VALID signals. For information on these signals, refer to “Input/Output
Signal Pin Assignment” on page 158.
A channel number is expressed in binary notation by the HIGH level (0)/LOW
level (1) of the /CH0 - /CH7 signals. The /CH7 signal is the most significant bit
and the /CH0 signal is the least significant bit. For example, if the /CH7 signal
is LOW and the /CH0 - /CH6 signals are HIGH, the expressed number is 128; if
the /CH0 - /CH1 signals are LOW and the CH2 - /CH7 signals are HIGH, the
expressed number is 3.
The /CH_VALID signal enables/disables the setting of the signals from /CH0 to
/CH7. If the /CH_VALID signal is LOW, a trigger will set the channels of the
E4981A to the channel numbers specified by the signals from /CH0 to /CH7.
The procedure to set the channel is given below.
Step 1. Set the /CH_VALID signal to HIGH.
Step 2. Set up a channel number using the /CH0 - /CH7 signals.
Step 3. Set the /CH_VALID signal to LOW.
Step 4. Generate a trigger.
For information on the setup timing of the /CH0 - /CH7 and /CH_VALID
signals, refer to Figure 9-3 on page 160.
Difference in execution timing depending on the channel selection
method
When the front panel or SCPI command is used to select a channel, the
selection is executed immediately. On the other hand, when the /CH0 to
/CH7 and /CH_VALID signals of the scanner interface are used, the channel
selection is not executed immediately after setting the signals but when a
trigger is generated.
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