Dc voltage – Fluke 45 User Manual
Page 106
45
Users Manual
DC Voltage
Resolution
Accuracy
Range
Slow
Medium
Fast
(6 Months)
(1 Year)
300 mV
3 V
30 V
300 V
1000 V
—
—
—
—
—
10 µV
100
µ
V
1
mV
10
mV
100 mV
100 µV
1
mV
10 mV
100 mV
1 V
002 % + 2
0.02 % + 2
0.02 % + 2
0.02 % + 2
0.02 % + 2
0.025 % + 2
0.025 % + 2
0.025 % + 2
0.025 % + 2
0.025 % + 2
100 mV
1000 mV
10 V
100 V
1000 V
1 µV
10 µV
100
µ
V
1 mV
10 mV
—
—
—
—
—
—
—
—
—
—
0.02 % + 6
0.02 % + 6
0.02 % + 6
0.02 % + 6
0.02 % + 6
0.025 % + 6
0.025 % + 6
0.025 % + 6
0.025 % + 6
0.025 % + 6
Input Impedance
10 M
e in parallel with <100 pF
Note
In the dual display mode, when the volts ac and volts dc functions are
selected, the 10 M
Ω
dc input divider is in parallel with the 1 M
Ω
ac
divider.
Normal Mode Rejection Ratio
>80 dB at 50 Hz or 60 Hz, slow and medium rates
>54 dB for frequencies between 50-440 Hz, slow and medium rates
>60 dB at 50 Hz, fast rate (Note: Fast rate has no filtering)
Maximum Allowable AC Voltage While Measuring DC Voltage or (AC + DC)
Voltages
Peak Normal Mode Signal
Range
Max Allowable Peak AC
Voltage
NMRR* >80 dB†
NMRR >60 dB†
300 mV
3 V
30 V
300 V
1000 V
100 mV
1000 mV
10 V
100 V
1000 V
15 V
15 V
1000 V
1000 V
1000 V
15 V
15 V
50 V
50 V
200 V
15 V
15 V
300 V
300 V
1000 V
* NMRR is the Normal Mode Rejection Ratio
† Normal Mode Rejection Ratio at 50 Hz or 60 Hz
±
0.1 %
Common Mode Rejection Ratio
>90 dB at do, 50 or 60 Hz, (1 k
e unbalanced, medium and slow rates)