45
Using the Agilent 81101A
The Mode/Trigger Screen
Furthermore, you can specify the pulse and trigger sources.
The following table provides a list of possible parameter combinations.
The rows refer to the numbers in the figure.
The pulse period source can be selected from internal oscillator, internal
PLL, and external CLK-IN:
If you have to trigger after an external event, use the startable
oscillator (
internal Osc.
), which starts on the external signal with a
fixed latency.
If you do not have to trigger but need a high accuracy frequency, then
use the
internal PLL
clock generation circuitry.
For even more accuracy, you can use the external CLK-IN.
In triggered/gated mode the internal PLL can be used as an arming
source. However, the internal PLL cannot be used as pulse and arming
source at the same time.
The following sections explain the individual mode combinations in
more detail. For each combination of trigger mode and pulse mode,
typical timing diagrams are provided, showing single and double pulses.
➀
Trigger Mode Continuous Triggered Gated Ext. Width
➁
Pulse Mode Pulses Burst Pulses Burst Pulses Burst
➂
Pulse Type
Single/Double Single/Double Single/Double
➃
Length
265536 265536 265536
➄
Period Source
internal Osc.
internal PLL
CLK-IN
internal Osc.
internal PLL
CLK-IN
internal Osc.
internal PLL
CLK-IN
➅
Arming Source
MAN
key
Ext. Input
MAN
key
Ext. Input
PLL
MAN
key
Ext. Input
MAN
key
Ext. Input
Trigger Out
marks each pulse period generated
Strobe Out
not used
↑
on 1st
↓
on last
not used
↑
on1st
↓
on last
not used
↑
on 1st
↓
on last
not used