Rohde & Schwarz ZNB20, Руководство пользователя

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GUI Reference
R&S
®
ZNB/ZNBT
518 User Manual 1173.9163.02 ─ 38
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"PASS "represents pass for all traces with enabled limit check. A trace without limit
lines or with disabled individual limit check always passes the global check.
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"FAIL" means that the limit check for one or more traces failed.
Remote command:
CALCulate:CLIMits:FAIL?
TTL1 Pass / TTL2 Pass
Assigns the active trace to the low-voltage (3.3 V) TTL output signals at the USER
PORT (see
Chapter 10.2.1.1, "USER PORT" , on page 1252).
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If "TTL1 Pass" is selected and the active trace passes the limit check (including
upper/lower limits and ripple limits), then the TTL signal is applied to pin 13 of the
USER PORT.
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If "TTL2 Pass" is selected and the active trace passes the limit check (including
upper/lower limits and ripple limits), then the TTL signal is applied to pin 14 of the
USER PORT connector.
If the active trace exceeds the limits, then no TTL signal is generated. It is possible to
activate both pass/fail signals for the same trace or assign several traces to a signal.
To generate the signals, the limit check of the active trace must be switched on.
Monitoring several traces
If a channel contains several traces, is possible to assign them one after another to
each pass/fail signal. The procedure divides the traces of the channel into four groups
that are either assigned to signal 1, to signal 2, to both signals, or to none of them.
If several traces with independent limit check are assigned to a pass/fail signal, then
the TTL signal is generated only if all traces are within limits. It is switched off as soon
as one trace exceeds the limits.
Application: Graduated limit check
The two pass/fail signals can be used to distinguish three quality levels of a DUT. The
test is performed with a looser and a tighter set of limit lines that are assigned to two
traces with identical channel and trace settings. The limit check for the two traces is
monitored by means of the signals "TTL1 Pass" / "TTL2 Pass", respectively.
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If the DUT is passed in both limit checks, the quality is good.
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If the DUT is failed in the limit check with tighter limits, the quality is still sufficient.
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If the DUT is failed in both limit checks, the quality is poor.
Instead of using two traces, it is possible to consider two groups of traces that are
assigned to "TTL1 Pass" and "TTL2 Pass".
Remote command:
CALCulate<Chn>:LIMit:TTLout<Pt>[:STATe]
Lines Softtool