4
A-to-D converter noise performance
Integration time
(NPLC)
Resolution
(ppm of range)
1
Normal mode
rejection (dB)
2
Readings/second
4
0.001 30 0 50,000
0.002 15 0 25,000
0.006 6 0 10,000
0.02 3 0 3,000
0.06 1.5 0 1,000
0.2 0.7 0 300
1 0.3 55 60 (50)
2 0.2 110
3
30 (25)
10 0.1 110
3
6 (5)
100 0.03 110
3
0.6 (0.5)
1. Resolution is defined as the typical DCV 10 V range RMS noise.
Auto-zero on for NPLC ≥ 1. See manual for additional noise characteristics.
2. Normal mode rejection for power line frequency ± 0.1%.
3. For power-line frequency ± 1% 75 dB and for ± 3% 55 dB.
4. Maximum rate with auto-zero off for 60 Hz and (50 Hz) operation.
System reading and throughput rates
DMM memory to PC (maximum reading rate out of memory)
1
Drawing – Path B
Reading format GPIB
readings/sec
USB 2.0
readings/sec
LAN (VXI-11)
readings/sec
LAN (sockets)
readings/sec
ASCII 4,000 8,500 7,000 8,500
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
Drawing – Path C
Maximum reading
rate into memory
or to direct I/O
(readings/sec)
Drawing–Path A or C
Function Resolution
(NPLC)
GPIB
msec
USB 2.0
msec
LAN
(VXI-11)
msec
LAN
(sockets)
msec
DCV/2-wire
resistance
0.001 2.6 2.9 4.6 3.2 50,000
ACV/
frequency
Fast filter
1 ms gate
10.0 10.0 10.0 10.0 500
1. ½ scale input signal, immediate trigger, trigger delay 0, auto-zero off, auto-range off, no math, null off,
60 Hz line frequency. See manual for performance on other functions.
System performance
Function
change
(msec)
1
Range change
LAN/GPIB
(msec)
2
Auto-range
(msec)
3
Maximum
external
trigger rate
Maximum
internal
trigger rate
DCV/2-wire
resistance
22 3.9/2.6 7.5 5,000/s 50,000/s
ACV/frequency 37 6.5/6.4 19 500/s 500/s
1. Time to change from 2-wire Resistance to this specified function, or DCV to 2-wire resistance using the
SCPI ”FUNC” command
2. Time to change from one range to the next higher range, ≤ 10 V, ≤ 10 MΩ
3. Time to automatically change one range and be ready for the new measurement, ≤ 10 V, ≤ 10 MΩ
DMM
input
DMM memory
50 k readings
non-volatile
Path ‘A’
Path ‘C’ Path ‘B’
PC
USB
LAN
GPIB
ADC
L4411A/
34410A/
34411A
DMM
System reading architecture
100
10
1
0.1
0.01
0.001 0.01 0.1 1 10 100
Integration time (NPLC)
RMS noise (ppm of range)
System reading architecture
(178 paginas)
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