技术资料.pdf - 第36页

36 Typical S ystem Spee ds (measurements m ade on a 3.2GHz PC running V B6 in Windows X P Pro) Single channel reading times in msec Direct measurements – direct to I/O (includ es switch, measure time and I/O time) Direct…

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1. One hour warm-up and a fixed configuration with slow AC filter, sine wave input, and 6½ digits. Temperature within ±
5°C of temperature at calibration (Tcal between 18-28°C)
2. 90 minute warm-up and a fixed configuration and 6½ digits. Temperature within ± 1°C of temperature at calibration
(Tcal between 18-28°C)
3. Relative to calibration standards
4. 20% over range on all ranges except 300VDC and AC ranges and 1 ADC and AC current ranges
5. For sine wave input > 5% of range; for inputs from 1% to 5% of range and < 50 kHz add 0.1% of range additional
error; for AC filter slow
6. For sine wave input >5% of range, limited to 1 x 10
8
volt-hertz. Typically, 30% of reading error at 1 MHz.
7. Accuracy for 4-wire ohms. Add 4 ohms uncertainty (typical) for 2-wire ohms function due to conductor and contact
resistance variability in the DMM. The 2-wire resistance accuracy can be improved by measuring a short on each
channel and using the built-in y = Mx + b scaling function. See User Guide, Chapter 3. The series resistance of the
34923/24/25/33/34 limits the use of the 100 ohms resistance range. Keysight recommends the use of 4-wire ohms for
resistance measurements. For high accuracy voltage measurements, select the DMM input resistance setting of > 10
G ohms to minimize the impact of relay contact resistance.
8. For inputs >100 mV; for inputs 10 mV to 100 mV multiply % of reading error X 10; for 1 sec aperture (6 1/2 digits)
9. Specified only for inputs > 10 mA. For AC filter slow
10. Add 50 uV error for 34923A/24A/33A and 7 μV error for the 34925A
11. Voltage measurements using Fixed-Z input impedance for the 100 V and 300 V ranges.
Additional low frequency error for ACV, ACI (% of reading)
Frequency
AC Filter Slow
AC Filter Medium
AC Filter Fast
10 Hz – 20 Hz
20 Hz – 40 Hz
40 Hz – 100 Hz
100 Hz -200 Hz
200 Hz – 1 kHz
> 1 kHz
0
0
0
0
0
0
0.74
0.22
0.06
0.01
0
0
-
-
0.73
0.22
0.18
0
Additional error for frequency, Period (% of reading)
Aperture (Digits)
Frequency 1 second (6½ digits) seconds (5½ digits) 0.01 seconds (4½ digits)
3 Hz – 5 Hz
5 Hz – 10 Hz
10 Hz – 40 Hz
40 Hz – 100 Hz
100 Hz – 300 Hz
300 Hz – 1 kHz
> 1 kHz
0
0
0
0
0
0
0
0.12
0.17
0.2
0.06
0.03
0.01
0
0.12
0.17
0.2
0.21
0.21
0.07
0.02
Temperature measurement accuracy
Temperature 1-year
accuracy
Type Best Range
1
Extended Range
1
Temperature
coefficient/
o
C
Thermocouple
(34921A only, includes
cold junction accuracy
on terminal block)
B
E
J
K
N
R
S
T
1100
o
C to 1820
o
C
-150
o
C to 1000
o
C
-150
o
C to 1200
o
C
-100
o
C to 1200
o
C
-100
o
C to 1300
o
C
300
o
C to 1760
o
C
400
o
C to 1760
o
C
-100
o
C to 400
o
C
1.2
o
C
1.0
o
C
1.0
o
C
1.0
o
C
1.0
o
C
1.2
o
C
1.2
o
C
1.0
o
C
400
o
C to 1100
o
C
-200
o
C to -150
o
C
-210
o
C to -150
o
C
-200
o
C to -100
o
C
-200
o
C to -100
o
C
-50
o
C to 300
o
C
-50
o
C to 400
o
C
-200
o
C to -100
o
C
1.8
o
C
1.5
o
C
1.2
o
C
1.5
o
C
1.5
o
C
1.8
o
C
1.8
o
C
1.5
o
C
0.03
o
C
0.03
o
C
0.03
o
C
0.03
o
C
0.03
o
C
0.03
o
C
0.03
o
C
0.03
o
C
RTD
R
0
from 49 Ω to 2.1 kΩ
-200
o
C to 600
o
C
0.06
o
C
0.003
o
C
Thermistor
2.2k, 5k, 10k
-80
o
C to 150
o
C
0.08
o
C
0.002
o
C
Note:
1. For total measurement accuracy, add temperature probe error, for < 1 oC accuracy, an external fixed reference is
required.
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.