ADCMT 7451A - Resistance Measurement (2 W, LP-2 W, 4 W, LP-4 W)

7451A/7461A/7461P Digital Multimeter Operation Manual
7.1.3 Resistance Measurement (2W, LP-2W, 4W, LP-4W)
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7.1.3 Resistance Measurement (2W, LP-2W, 4W, LP-4W)
• 7461A/61P
2W and 4W measurements
Low Power 2W and 4W measurements (LP-2W/LP-4W)
Response time: 100 M = 5 s
(Time until the measurement value reaches within 0.1% of the final value)
1 M/10 M = 0.5 s
(Time until the measurement value reaches within 0.1% of the final value)
Range
Maximum
display
Resolution
Measurement
current
Measurement accuracy *1
(% of reading + digits)
Temperature coefficient *4
(ppm of reading + 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
100  119.9999 100  10 mA 0.0030+30.0 0.0060+35.0 0.0080+35.0 6.0+5.0 6.0+5.0
1000  1199.999 1 m 1 mA 0.0020+5.0 0.0060+5.0 0.0080+8.0 6.0+1.0 6.0+5.0
10 k 11.99999 10 m 100 A 0.0020+5.0 0.0060+5.0 0.0080+8.0 6.0+1.0 6.0+5.0
100 k 119.9999 100 m 10 A 0.0020+5.0 0.0060+5.0 0.0080+8.0 6.0+1.0 6.0+5.0
1000 k 1199.999 1  5 A 0.0020+10.0 0.0060+30.0 0.0080+30.0 10.0+5.0 10.0+7.0
10 M 11.99999 10  500 nA 0.0150+10.0 0.0200+30.0 0.0300+30.0 30.0+5.0 *3 30.0+7.0 *3
100 M 119.9999 100  50 nA 0.3000+100.0 0.5000+100.0 0.6000+100.0 700.0+5.0 700.0+7.0
*1 Integration time: 10 PLC, Auto-zero: ON for 2W, Display digit: 6 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 15 ppm/C is added to the temperature coefficient in the temperature range of 30C to 50C.
*4 The temperature coefficient in Auto-zero ON is used in the 4W
measurement.
Range
Maximum
display
Resolution
Measurement
current
Measurement accuracy *1
(% of reading + digits)
Temperature coefficient *4
(ppm of reading + 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
100  119.9999 100  1 mA 0.0030+30.0 0.0070+50.0 0.0100+60.0 6.0+5.0 6.0+8.0
1000  1199.999 1 m 100 A 0.0020+30.0 0.0070+50.0 0.0100+60.0 6.0+5.0 6.0+8.0
10 k 11.99999 10 m 10 A 0.0020+30.0 0.0070+50.0 0.0100+60.0 7.0+5.0 7.0+8.0
100 k 119.9999 100 m 5 A 0.0020+15.0 0.0070+50.0 0.0100+60.0 10.0+5.0 10.0+25.0
1000 k 1199.999 1  500 nA 0.0150+15.0 0.0450+50.0 0.0500+60.0 65.0+5.0 *3 65.0+8.0 *3
10 M 11.99999 10  50 nA 0.3000+100.0 0.6000+100.0 0.8000+100.0 700.0+5.0 700.0+8.0 
*1 Integration time: 10 PLC, Auto zero: ON for 2W, Display digit: 6 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 15 ppm/C is added to the temperature coefficient in the temperature range of 30C to 50C.
*4 The temperature coefficient in Auto-zero ON is used in the LP-4W measurement.