Specifications

System readings and
throughput rates
The 34410A and 34411A have
excellent programming and
data retrieval performance.
This performance is exhibited
in the tables below, which are
straight from the data sheet.
There are three paths described
in the system reading architec-
ture diagram. See Figure 11.
• Path A – this is the reading
rate into reading storage.
Top speed into memory is
50,000 readings/s, which
is a function of the A-to-D
sampling rate. Any measure-
ment – DC or AC – will
generate a pulse on the
voltmeter complete signal
of the DMM. That signal
can be used to measure all
sample rates on a scope
or frequency counter.
• Path B – this is the time it
takes to retrieve readings
from reading storage (DMM
memory to PC). This speed
is dependent both upon the
data format and the interface.
Data format can be ASCII
(15 bytes), binary 32 (4 bytes),
or binary 64 (8 bytes). Inter-
faces include the physical
interfaces of GPIB, LAN,
and USB 2.0, and also
LAN: VXI-11 or sockets.
• Path C – this is the time it
takes to programmatically
trigger a reading (or readings)
and retrieve the results into
a computer. Single reading
times are shown in the direct
I/O table and represent a
“READ?” command, which is
the same as the
“INIT;:FETCH?” command.
• Since the data rates are so fast
when you use binary format,
the PC can keep up with any
sample rate by simply issuing
requests for blocks of readings
at periodic times while making
continuous measurements at
up to 50,000 readings/s rate.
Only two modes are not fast
enough to keep up with
50,000 readings/s: ASCII and
64-bit binary over GPIB.
17
DMM memory to PC (Maximum reading rate out of memory)
1
Drawing – Path B
Reading GPIB USB 2.0 LAN (VXI-11) LAN (Sockets)
Format Readings/s Readings/s Readings/s Readings/sec
ASCII 2,850 2,000 4,800 4,000
32-bit Binary 89,000 265,000 110,000 270,000
64-bit Binary 47,000 154,000 60,000 160,000
Direct I/O Measurements (Single reading – measure and I/O time)
1
Maximum Reading
Drawing – Path C Rate into Memory
Function Resolution GPIB USB 2.0 LAN LAN
or to Direct I/O
(NPLC) ms ms (VXI-11) (Sockets) (Readings/secs)
ms ms Drawing – Path A or C
DCV/2-wire 0.006 (0.001) 3.0 3.6 5.0 3.5 10,000 (50,000)
Resistance
ACV/ Fast Filter 10.0 10.0 10.0 10.0 500
Frequency 1 ms Gate
1
1/2 scale input signal, immediate trigger, trigger delay 0, auto-zero off, auto-range off, no math, null off,
60 Hz line frequency, Specifications are for 34410A or (34411A). See manual for performance on other functions.
Figure 11. System Reading Architecture