技术资料.pdf - 第37页
37 34934A multi - channel close speeds over GPIB (msec) Isolate for fixed mode Auto 100 mode Auto 0 mode Close 2 channels Close 5 channels Close 10 channels Close 60 channels 0.97 0.43 0.22 0.13 1.22 0.54 0.28 0.17 1.31 …
36
Typical System Speeds (measurements made on
a 3.2GHz PC running VB6 in Windows XP Pro)
Single channel reading times in msec
Direct measurements
– direct to I/O (includes
switch, measure time and I/O time)
Direct measurement
to memory(GPIB)
Single-channel
1,2
GPIB
msec
USB 2.0
msec
LAN (w/VXI 11)
msec
Measurement into
memory msec
Single channel, DCV
2.83
3.14
4.57
1.90
Single channel, ACV
5.00
5.35
5.75
4.00
Single channel, ohms
2.91
3.14
4.65
1.90
Single channel while changing scale
(eg MEAS DCV 10 / MEAS DCV 1)
9.52
10.64
11.76
8.40
Single channel while changing function
(eg. MEAS ACV / MEAS DCV)
128
120
120
120
Command execution time
3
34925A
Open or Close
Read?
Close/Read/Open
Init/*WAI
Close/Init/Open
0.7
2.9
4.8
1.9
3.7
0.9
3.3
5.3
2.1
4.1
1.6
4.7
6.5
3
4.7
34923A
Open or Close
Read?
Close/Read/Open
Init/*WAI
Close/Init/Open
0.9
2.9
5.3
1.9
4.2
1.2
3.3
5.8
2.1
4.7
1.8
4.7
6.5
3
5.2
34921A
Open or Close
Read?
Close/Read/Open
Init/*WAI
Close/Init/Open
4.7
2.9
14
1.9
12.4
5 3
3
15
2.1
14
5.3
4.7
15
3
4
34934A
Close
Read?
Open
1.8
2.8
1.5
2.2
3.1
1.8
3.1
4.8
3.2
Note:
1. Readings were made with minimum NPLC, delay 0, display off, autozero off
2. All times include the issue of “READ?” and the retrieval of data
3. CLOSE or OPEN bus transfer times allowed to overlap previous command; command parse times overlap current
activity until IO latency dominant
37
34934A multi-channel close speeds over GPIB (msec)
Isolate
for
fixed
mode
Auto
100
mode
Auto 0 mode
Close 2
channels
Close 5
channels
Close 10
channels
Close 60
channels
0.97
0.43
0.22
0.13
1.22
0.54
0.28
0.17
1.31
0.56
0.29
0.21
Single channel measurement rates – DMM reading rates
1,2
Function
Resolution
Rds/s
DCV
4½ digits (0.02 plc)
5½ digits (1 plc)
6½ digits (10 plc)
3000
59
6
2-wire resistance
4½ digits (0.02 plc)
5½ digits (1 plc)
6½ digits (10 plc)
2000
58
6
Thermocouple
(0.02 plc)
0.1
o
C (1 plc)
1000
59
RTD/Thermistor
1
o
C (0.02 plc)
0.1
o
C (1 plc)
0.01
o
C (10 plc)
1900
58
6
ACV
6½ fast (200Hz)
6½ med (20Hz)
6½ slow (3Hz)
350
350
350
Frequency, period
4½ digits (10 ms)
5½ digits (100 ms)
6½ digits (1 s gate)
70
9
1
Note:
1. Readings speeds for 60Hz; autozero off
2. For fixed function and range, readings to memory, scaling and alarms off, autozero off.
38
Scanning measurement rates to bus or memory
Direct measurements – direct to I/O (includes switch,
measure time and I/O time)
Measurement into
memory
Scanning channels
1
GPIB
ch/sec
USB 2.0 ch/sec
LAN (w VXI 11)
ch/sec
Into memory ch/sec
Scanning DCV or 2-wire ohms
34925A
34923A/24A
34921A/22A
920
588
109
860
572
109
980
605
109
1000
625
109
Scanning ACV
2
34925A
34923A/24A
34921A/22A
318
260
88
315
260
88
323
260
88
318
260
88
Scanning temperature
34921A
109
109
109
109
Scanning digital in 34950A
660
592
815
1038
Note:
1. Speeds are for 4 1/2 digits, delay 0, display off, autozero off and scanning is within bank on the same module; add
10ms for between banks or modules for 2-wire measurements; 4-wire measurements are slower
2. Add additional time for filter setting on ACV
Data out of memory to LAN, USB, or GPIB (data transfer rate with 1000 channel blocks)
GPIB rds/sec
USB 2.0 rds/sec
LAN (w VXI 11)
1
rds/sec
Readings
2560
2400
3542
Readings with timestamp
1304
1230
1826
Readings with all format options ON
980
926
1361
Note:
1. LAN large block throughput rate is increased by approximately 30% using LAN sockets