True Rms AC Voltage ACCoupled

Range

Resolution

Slow

Medium

Fast

300 mV

-

10 MV

100 MV

3 V

-

100 MV

1 mV

30 V

-

1 mV

10 mV

300 V

-

10 mV

100 mV

750 V

-

100 mV

1 V

100 mV

1 MV

-

-

1000 mV

10 MV

-

-

10 V

100 mv

-

-

100 V

1 mV

-

-

750 V

10 mV

-

Frequency

Linear Accuracy

dB Accuracy

Power*

Max Input at Upper Freq

Slow

Medium

Fast

Slow/Med

Fast

20-50 Hz

1% + 100

1% + 10

7% + 2

0.15

0.72

2% + 10

750 V

50 Hz -10 kHz

0.2% + 100

0.2% + 10

0.5% + 2

0.08

0.17

0.4% + 10

750 V

10 - 20 kHz

0.5% + 100

0.5% + 10

0.5% + 2

0.11

0.17

1% + 10

750 V

20 - 50 kHz

2% + 200

2% + 20

2% + 3

0.29

0.34

4% + 20

400 V

50 - 100 kHz

5% + 500

5% + 50

5% + 6

0.70

0.78

10% + 50

200 V

* Error in power mode will not exceed twice the linear accuracy specification

Accuracy specifications apply within the following limits, based on reading rate:

Slow Reading Rate: Between 15,000 and 99,999 counts (full range) Medium Reading Rate: Between 1,500 and 30,000 counts (full range) Fast Reading Rate: Between 150 and 3,000 counts (full range)

Decibel Resolution

Resolution

Slow & Medium

Fast

0.01 dB

1 MW in parallel with <100 pF

Maximum Crest Factor 3.0

Common Mode Rejection Ratio

>60 dB at 50 or 60 Hz (1 kW unbalanced medium rate)

Maximum Input

750 V rms, 1000 V peak

2 x 107 Volt-Hertz product on any range, normal mode input

1 x 106 Volt-Hertz product on any range, common mode input

(AC + DC) Voltage Accuracy

Total Measurement Error will not exceed the sum of the separate ac and dc accuracy specifications, plus 1 display count. Refer to the table under "Maximum Allowable AC Voltage While Measuring DC Voltage or (AC + DC) Voltage" located on page 1-6.

Note

When measuring AC + DC, (or any dual display combination of AC and DC) in the fast reading rate, the Fluke 45 may show significant reading errors. This results from a lack of filtering on the DC portion of the measurement for the fast reading rate. To avoid this problem, use only the "slow" and "medium" reading rates for AC + DC or AC and DC combinations.

Maximum Frequency of AC Voltage Input While Measuring AC Current

When the meter makes ac current and ac voltage measurements using the dual display, the maximum frequency of the voltage input is limited to the maximum frequency of the current function. For example, if you are making an ac current measurement on the 10 A range, the maximum frequency of the voltage input must be less than 2 kHz.

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