Datasheet

12
Measurement characteristics
DC voltage
Measurement method: Keysight patented continuously integrating
multi-slope IV A/D converter
A/D linearity: 0.0002% of reading + 0.0001% of range
Input resistance:
0.1 V, 1 V, 10 V range
100 V, 1000 V range
Selectable 10 MΩ or >10 GΩ
10 MΩ ± 1%
Input bias current: <30 pA at 25 °C
Input terminals: Copper alloy
Input protection: 1000 V on all ranges
True RMS AC voltage
Measurement type: AC–coupled True RMS.
Measures the AC component of the input.
Measurement method: Digital sampling with anti-alias filter
Maximum input: 400 DCV, 1100 Vpeak
Input impedance: 1 MΩ ±1%, in parallel with <100 pF
Input protection: 750 Vrms all ranges
DC and True RMS AC current
AC measurement type: Directly coupled to the fuse and shunt.
AC True RMS measurement (measures the AC
component only).
AC measurement
method:
Digital sampling with anti-alias filter
Input protection 3 A: Externally accessible 3.15 A, 500 V fuse
(Replacement part number 2110-1547 3.15 A
external fuse)
Internal 11 A, 1000 V fuse
(Replacement part number 2110-1402 11 A
external fuse)
Input protection 10 A:
(34461A only)
Internal 11 A, 1000 V fuse
(Replacement part number 2110-1402 11 A
external fuse)
AC crest factor and peak input
Crest factor: 10:1 maximum crest factor, (3:1 at full-scale).
Measurement bandwidth limited to 300 kHz for
signal plus harmonics.
Peak input: 300% of range or maximum input
Overload ranging : Will select higher range if peak input overload is
detected
during auto range. Overload is reported in manual
ranging.
Resistance
Measurement method: Selectable 4-wire or 2-wire ohms.
Current source referenced to LO input.
Maximum lead
resistance
(4-wire ohms):
10% of range per lead for 100 Ω, 1 kΩ ranges.
1 kΩ per lead on all other ranges.
Input protection: 1000 V on all ranges
Continuity/diode test
Response time: 300 samples/s with audible tone
Continuity threshold: Fixed at 10 Ω
DC ratio
Measurement method: Input HI-LO/reference (sense) HI-LO
Input HI-LO: 100 mV to 1000 V ranges
Reference (sense) HI-Input
LO:
100 mV to 10 V ranges (autoranged)
Input to reference
(sense):
HI and LO reference (sense) terminals reference
to LO input <12 V
Temperature
PT100 platinum RTD sensor, α= 0.00385Ω/Ω/°C; DIN/IEC 751.
Measurement conversions limited to -200 to 600 °C.
5 kΩ thermistor β= 3891; YSI 44007 or equivalent.
Measurement conversions limited to -80 to 150 °C.
Measurement noise rejection
60 Hz (50 Hz ) for 1 kΩ LO lead unbalance ( ± 500 V peak maximum)
DVC CMRR: 140 dB
AVC CMRR: 70 dB
Integration time Normal mode rejection
1
100 PLC/1.67 s (2 s) 60 dB
2
10 PLC/167 ms (200 ms) 60 dB
2
1 PLC/16.7 ms (20 ms) 60 dB
2
0.2 PLC/3 ms (3 ms) 0 dB
0.02 PLC/400 s (400 s) 0 dB
Frequency and period
Measurement method: Reciprocal-counting technique.
Measurement is AC-coupled using AC measurement
functions.
Voltage ranges: 100 mVrms full scale to 750 Vrms. Auto or manual
ranging.
Gate time: 10 ms, 100 ms, or 1 s
Measurement consider-
ations
All frequency counters are susceptible to error when
measuring low-voltage, low-frequency signals.
Shielding
inputs from external noise pickup is critical for
minimizing
measurement errors.
Autozero OFF operation
Following instrument warm–up at a stable ambient temperature ±1 °C and <10
minutes.
Add 0.0002% of range + 5 V for DCV or + 5 mΩ for resistance.
Measurement settling considerations
ACV, ACI, Frequency, Period
Default delays are selected to give first reading right for most measure-
ments. Errors will occur when attempting to measure the frequency or period
of an input following a DC offset voltage change. The input blocking RC time
constant must be allowed to fully settle (up to 1 second) before the most
accurate measurements are possible.
Applying >300 V ACrms or >1 Arms 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 other functions or ranges. The additional error will gener-
ally dissipate within a few minutes.
DCV, DCI, Resistance
Applying >1 A DC will cause self-heating in signal-conditioning compo-
nents. These errors are included in the instrument specifications. Internal
temperature changes due to self-heating may cause additional error on other
functions or ranges. The additional error will generally dissipate within a few
minutes.
Reading settling times are affected by source impedance, cable dielectric
characteristics, and input signal changes. Keysight recommends the use of
PTFE or other high-impedance, low-dielectric absorption wire insulation for
these measurements.
Measurement Characteristics 34460A / 34461A
1. For power-line frequency ± 0.1%
2. For power-line frequency ± 1%, the NMR is 40 dB
For ± 3%, use 30 dB