AC Characteristics
Measurement Noise Rejection
[ 8 ]
AC CMRR
True RMS AC Voltage
Measurement Method:
Crest Factor:
AC Filter Bandwidth:
Slow
Medium
Fast
Input Impedance:
Input Protection:
True RMS AC Current
Measurement Method:
Shunt Resistor:
Burden Voltage:
Input Protection:
70 dB
AC-coupled True RMS – measures
the ac component of input with up
to 400 Vdc of bias on any range.
Maximum 5:1 at full scale
3 Hz – 300 kHz
20 Hz – 300 kHz
200 Hz – 300 kHz
1 M
Ω ± 2%, in parallel with 100 pF
750 V rms all ranges
Direct coupled to the fuse and shunt.
AC-coupled True RMS measurement
(measures the ac component only).
0.1
Ω for 1 A and 3 A ranges
1 A range: < 1 V rms
3 A range: < 2 V rms
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.
Measuring Characteristics
Function
ACV, ACI 6
1
⁄
2
6
1
⁄
2
6
1
⁄
2
6
1
⁄
2
6
1
⁄
2
7 sec/reading
1
1.6
[ 10 ]
10
50
[ 11 ]
AC Filter
Slow
Medium
Fast
Fast
Fast
System Speeds
[ 11 ] , [ 12 ]
Function or Range Change
Autorange Time
ASCII readings to RS-232
ASCII readings to GPIB
Max. Internal Trigger Rate
Max. External Trigger Rate to Memory
Max. External Trigger Rate to GPIB/RS-232
5/sec
<0.8 sec
50/sec
50/sec
50/sec
50/sec
50/sec
Operating Characteristics [ 9 ]
Reading/s
Digits
[ 1 ] Specifications are for 1-hour warm-up at 6
1
⁄
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 8x10
7
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 4
1
⁄
2
digits, Delay 0, Display OFF, and
Fast AC filter.
8
Chapter 8 Specifications
219
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