HP 34401A User Manual page 216

Chapter 8 Specifications
DC Characteristics
Measuring Characteristics
DC Voltage
Measurement Method: Continuously integrating, multi-slope III
A/D converter.
A/D Linearity: 0.0002% of reading + 0.0001% of range
Input Resistance:
0.1 V, 1 V, 10 V ranges Selectable 10 M or >10 G
100 V, 1000 V ranges 10 M
Input Bias Current: < 30 pA at 25°C
Input Terminals: Copper alloy
Input Protection: 1000 V on all ranges
Resistance
Measurement Method: Selectable 4-wire or 2-wire ohms.
Current source referenced to LO input.
Max. Lead Resistance: 10% of range per lead for 100 , 1 k
(4-wire ohms) ranges. 1 k per lead on all other ranges.
Input Protection: 1000 V on all ranges
DC Current
Shunt Resistor: 0.1 for 1A, 3A. 5 for 10 mA, 100 mA
Input Protection: Externally accessible 3A, 250 V fuse
Internal 7A, 250 V fuse
Continuity / Diode Test
Response Time: 300 samples/sec with audible tone
Continuity Threshold: Adjustable from 1
DC:DC Ratio
Measurement Method: Input HI-LO / Reference HI-LO
Input HI-LO 100 mV to 1000 V ranges
Reference HI-Input LO 100 mV to 10 V ranges (autoranged)
Input to Reference Reference LO to Input LO voltage < 2 V
Reference HI to Input LO voltage < 12V
Measurement Noise Rejection
60 Hz ( 50 Hz ) [ 5 ]
DC CMRR
Integration Time
100 PLC / 1.67s (2s)
10 PLC / 167 ms (200 ms)
1 PLC / 16.7 ms (20 ms)
0.2 PLC / 3 ms (3 ms)
0.02 PLC / 400 s (400 s)
Teflon is a registered trademark of E.I. duPont deNemours and Co.
[11]
1%
to 1000
140 dB
Normal Mode Rejection
[ 6 ]
60 dB
[ 7 ]
60 dB
[ 7 ]
60 dB
[ 7 ]
0 dB
0 dB
Operating Characteristics
Function Digits Readings/s
DCV, DCI, and 6 1 0.6 (0.5)
2
Resistance 6 1 6 (5)
2
60 (50)
5 1
2
300
1
5
2
1000
1
4
2
System Speeds
[ 9 ]
Function Change
Range Change
Autorange Time
ASCII readings to RS-232
ASCII readings to HP-IB
Max. Internal Trigger Rate
Max. External Trigger Rate to Memory
Max. External Trigger Rate to HP-IB
Autozero OFF Operation
Following instrument warm-up at calibration temperature 1°C
and <10 minutes, add 0.0002% range additional error + 5 V.
Settling Considerations
Reading settling times are affected by source impedance,
cable dielectric characteristics, and input signal changes.
Measurement Considerations
HP recommends the use of Teflon or other high-impedance,
low-dielectric absorption wire insulation for these measurements.
Specifications are for 1-hour warm-up at 6
[ 1 ]
Relative to calibration standards.
[ 2 ]
20% overrange on all ranges, except 1000 Vdc, 3 A range.
[ 3 ]
Specifications are for 4-wire ohms function, or 2-wire
[ 4 ]
ohms using Math Null. Without Math Null, add 0.2
additional error in 2-wire ohms function.
For 1 k unbalance in LO lead.
[ 5 ]
For power-line frequency 0.1%.
[ 6 ]
For power-line frequency 1%, subtract 20 dB.
[ 7 ]
For 3%, subtract 30 dB.
Readings speeds for 60 Hz and ( 50 Hz ) operation,
[ 8 ]
Autozero Off.
Speeds are for 4 1 digits, Delay 0, Autozero OFF,
[ 9 ]
2
and Display OFF. Includes measurement and data
transfer over HP-IB.
Add 20 V for dc volts, 4 A for dc current, or
[ 10 ]
20 m for resistance.
For these ranges, inputs beyond 17V are
[ 11 ]
clamped through 100 k (typical).
[ 8 ]
Additional
Noise Error
0% of range
0% of range
0.001% of range
0.001% of range [10]
0.01% of range [10]
26/sec
50/sec
<30 ms
55/sec
1000/sec
1000/sec
1000/sec
900/sec
1
digits.
2
8
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