Agilent Technologies 34401A manual AC Characteristics Measuring Characteristics

Chapter 8 Specifications

AC Characteristics

Measuring Characteristics

Measurement Noise Rejection [ 8 ]

AC CMRR	70 dB
True RMS AC Voltage
Measurement Method:	AC-coupled True RMS – measures
	the ac component of input with up
	to 400 Vdc of bias on any range.
Crest Factor:	Maximum 5:1 at full scale
AC Filter Bandwidth:
Slow	3 Hz – 300 kHz
Medium	20 Hz – 300 kHz
Fast	200 Hz – 300 kHz
Input Impedance:	1 MΩ ± 2%, in parallel with 100 pF
Input Protection:	750 V rms all ranges
True RMS AC Current
Measurement Method:	Direct coupled to the fuse and shunt.
	AC-coupled True RMS measurement
	(measures the ac component only).
Shunt Resistor:	0.1 Ω for 1 A and 3 A ranges
Burden Voltage:	1 A range: < 1 V rms
	3 A range: < 2 V rms
Input Protection:	Externally accessible 3A, 250 V fuse
	Internal 7A, 250 V fuse

Settling Considerations

Applying >300 V rms (or >1 A rms) will cause self-heating in signal-conditioning components. These errors are included in the instrument specifications. Internal temperature changes due to self-heating may cause additional error on lower ac voltage ranges. The additional error will be less than 0.02% of reading and will generally dissipate within a few minutes.

Operating Characteristics [ 9 ]

Function	Digits	Reading/s	AC Filter
ACV, ACI	61⁄2	7 sec/reading	Slow
	61⁄2	1	Medium
	61⁄2	1.6 [ 10 ]	Fast
	61⁄2	10	Fast
	61⁄2	50 [ 11 ]	Fast
System Speeds [ 11 ] , [ 12 ]
Function or Range Change			5/sec
Autorange Time			<0.8 sec
ASCII readings to RS-232			50/sec
ASCII readings to GPIB			50/sec
Max. Internal Trigger Rate			50/sec
Max. External Trigger Rate to Memory			50/sec
Max. External Trigger Rate to GPIB/RS-232			50/sec

[ 1 ] Specifications are for 1-hour warm-up at 61⁄2 digits, Slow ac filter, sinewave input.

[ 2 ] Relative to calibration standards.

[ 3 ] 20% overrange on all ranges, except 750 Vac, 3 A range.

[ 4 ] Specifications are for sinewave input >5% of range. For inputs from 1% to 5% of range and <50 kHz,

add 0.1% of range additional error. For 50 kHz to 100 kHz, add 0.13% of range.

[ 5 ] 750 Vac range limited to 100 kHz or 8x107 Volt-Hz.

[ 6 ] Typically 30% of reading error at 1 MHz.

[ 7 ] For frequencies below 100 Hz, slow AC filter specified

	for sinewave input only.
[ 8 ]	For 1 kΩ unbalance in LO lead.
[ 9 ]	Maximum reading rates for 0.01% of ac step
	additional error. Additional settling delay required

when input dc level varies.

[ 10 ] For External Trigger or remote operation using default settling delay ( Delay Auto ).

[ 11 ] Maximum useful limit with default settling delays defeated.

[ 12 ] Speeds are for 41⁄2 digits, Delay 0, Display OFF, and Fast AC filter.

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