Agilent Technologies U1251A manual Electrical Specifications, DC Specifications, Accuracy

Specifications 8

Electrical Specifications

DC Specifications

Table 7-1DC Accuracy ± (% of reading + Number of Least Significant Digit)

			Test Current/		Accuracy
Function	Range	Resolution	Burden Voltage	U1251A		U1252A
	50.000 mV	0.001 mV	-	0.05 + 50 [2]	0.05 + 50 [2]
	500.00 mV	0.01 mV	-
	1000.0 mV	0.1 mV	-
Voltage [1]	5.0000 V	0.0001 V	-	0.03 + 5	0.025 + 5
	50.000 V	0.001 V	-
	500.00 V	0.01 V	-		0.03 + 5
	1000.0 V	0.1 V	-

Notes for DC voltage specifications:

1Input impedance: >1GΩ for 50 mV to 1000 mV ranges. For U1251A, input impedance is 10 MΩ (nominal) for 5 V to 1000 V

ranges. For U1252A, input impedance is 10 MΩ (nominal) in parallel with 1.1 MΩ at dual display.

2The accuracy could be 0.05 % +10 for U1251A and 0.05 % + 5 for U1252A. Always use the Null function to zero out the thermal effect before measuring the signal.

			Test Current/		Accuracy
Function	Range	Resolution	Burden Voltage	U1251A	U1252A
	500.00 Ω [3]	0.01 Ω	1.04 mA	0.08 + 10	0.05 + 10
	5.0000 kΩ [3]	0.0001 kΩ	416 µA
	50.000 kΩ	0.001 kΩ	41.2 µA	0.08 + 5	0.05 + 5
	500.00 kΩ	0.01 kΩ	4.12 µA
Resistance	5.0000 MΩ	0.0001 MΩ	375 nA	0.2 + 5	0.15 + 5
	50.000 MΩ [4]	0.001 MΩ	187 nA	1 + 10	1 + 5
	500.00 MΩ [4]	0.01 MΩ	187 nA	-	3 + 10 < 200MΩ/
					8 + 10 > 200MΩ
	500.00 nS [5]	0.01 nS	187 nA	1 + 20	1 + 10

Notes for resistance specifications:

3The accuracy of 500 Ω and 5 kΩ is specified after Null function, which is used to subtract the test lead resistance and the thermal effect.

4For the range of 50/500 MΩ, the R.H. is specified for < 60 %.

5The accuracy is specified for < 50 nS and after Null function with open test lead.

Agilent U1251A/U1252A User’s and Service Guide 151