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7451A/7461A/7461P Digital Multimeter Operation Manual
7.1.3 Resistance Measurement (2W
, LP-2W
, 4W
, LP-4W
)
7-9
Low Power 2W
and 4W
measurements (LP-2W
/LP-4W
)
Response time:
300 M
= 5 s
(Time until the measurement value reaches within 0.1% of the final value)
3 M
/30 M
= 0.5 s
(Time until the measurement value reaches within 0.1% of the final value)
Additional error depending on the integration time
Voltage between input terminals without connections.
9.5 V or less
Maximum allowable applied voltage
Range
Maximum
display
Resolution
Measurement
current
Measurement accuracy *1
(% of r digits)
Temperature coefficient *5
(ppm of r digits)/
C
24 hours
23
C
1
C *2
90 days
23
C
5
C
1 year
23
C
5
C
Auto-zero
ON
Auto-zero
OFF
300
319.999
1 m
100
A
0.0030+30.0
0.0080+40.0
0.0150+40.0
10.0+5.0
10.0+50.0
3000
3199.99
10 m
100
A
0.0020+5.0
0.0080+11.0
0.0150+11.0
10.0+1.0
10.0+5.0
30 k
31.9999
100 m
10
A
0.0020+5.0
0.0080+11.0
0.0150+11.0
10.0+1.0
10.0+5.0
300 k
319.999
1
1
A
0.0070+5.0
0.0300+11.0
0.0300+11.0
30.0+1.0
30.0+5.0
3000 k
3199.99
10
100 nA
0.0600+20.0
0.1800+33.0
0.2000+33.0
100.0+5.0 *3
100.0+5.0 *3
30 M
31.9999
100
10 nA
0.6000+20.0
1.7000+33.0
2.0000+33.0
1000.0+5.0 *4
1000.0+5.0 *4
*1
Integration time: 10 PLC, Auto zero: ON for 2W
, Display digit: 5 1/2
The measurement cable resistance and 0.2
(internal circuit resistance error) are added to the digit error in 2W
measurement.
*2
Relative value with respect to the calibration standard
*3
115 ppm/
C is added to the temperature coefficient in the temperature range of 30
C to 50
C.
*4
1150 ppm/
C is added to the temperature coefficient in the temperature range of 30
C to 50
C.
*5
The temperature coefficient in Auto-zero ON is used in the 4W
measurement.
Integration time
Additional error
(digit + m
)
100
s
IT
200
s
-
In a 3 1/2-digit display
2+20
200
s < IT
2 ms
Includes FAST1 and FAST2. In a 4 1/2-digit display
10+20
2.01 ms < IT < 9.99 ms
-
In a 5 1/2-digit display
20+20
10 ms <
IT < 1 PLC
-
In a 5 1/2-digit display
2+20
1 PLC
IT < 10 PLC
Integral multiple of 1 PLC
In a 5 1/2-digit display
1+0
10 PLC < IT
10 s
Integral multiple of 1 PLC
In a 5 1/2-digit display
2+0
Between
and COM
1000 Vpeak
Between COM and the chassis
500 V
Between 4W
Hi-4W
Lo
200 Vpeak
Between 4W
Hi, 4W
Lo and the chassis
500 V