34411A AGILENT TECHNOLOGIES, 34411A Datasheet - Page 10

• Manufacturer Part Number: 34411A
• Description: MULTIMETER, DIGITAL, BENCH, 6-1/2 DIGIT
• Manufacturer: AGILENT TECHNOLOGIES

Specifications of 34411A

• Dmm Type: Bench
• Voltage Measuring Range Dc: 100mV To 1000V
• Voltage Measuring Range Ac: 100mV To 750V
• Current Measuring Range Dc: 100µA To 3A
• Current Measuring Range Ac: 100µA To 3A
• Lead Free Status / RoHS Status: na

The 34411A level trigger is
specified in units of any mea-
surement function. In this case,
a DCV measurement is being
made at 50 k samples/s. With
1 million readings, 20 seconds
of data can be stored at this
rate. Pre- and post-triggering
allows you to create a scope-
like capture of the waveform
around an event. The DMM will
continuously make measurements
until the level trigger is met. It
will retain the pre-trigger count
of measurements and then begin
the count of post-trigger mea-
surements. This is an excellent
alternative to waiting for an
asynchronous event, and there
is no discontinuity of measure-
ments between pre- and post-
trigger counts.
Figure 5. Using a precision timer to sample signals
Trigger
Trigger
Delay
Sample #1
Interval
Sample #2
Interval
Delayed sampling from occur-
rence of an external trigger
In many applications, you need
to wait a period of time before
actually making a measurement,
as illustrated in the example
where we discussed precision
DC measurements of pulses.
There are many reasons for
delaying a measurement. You
may need to wait for the signal
to settle – as is typical when
you are measuring large resis-
tances in the presence of stray
capacitance. In the ballast
application we discussed earlier,
a delay is needed to make the
instrument wait until after the
initial high-voltage discharge
has taken place, so the quies-
cent AC voltage level can be
measured.
Sample #3
10
Interval
Both the 34410A and 34411A
have a hardware-coupled
external trigger input. A delay
can be inserted between the
external event and the start
of any measurement. This
delay can be zero, and the
measurement engine starts its
measurement in less than 1 µs
from the external trigger (DC
measurement). The delay can
also be up to 3600 seconds
(with 20 µs resolution).
Both the 34410A and 34411A
have a precision sample timer
with very little jitter (<100 ns).
An external trigger event can
start a single measurement
or a burst of measurements
spaced by the sample timer.
Figure 5 illustrates the concept
of a separate trigger delay
and sample intervals. Sample
intervals can be as low at
100 µs for the 34410A and
20 µs for the 34411A.