Fluke 45 user manual Decibel Reference Resistance, Maximum Crest Factor, AC + DC Voltage Accuracy

Models: 45

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Decibel Reference Resistance

45

Users Manual

Decibel Reference Resistance

8000

500

124

8

1200

300

110

4

1000

250

93

2

900

150

75

 

 

800

135

50

 

 

600 *

125

16

 

 

 

 

 

 

 

 

*Default resistance

Reading displayed in watts (POWER)

Input Impedance

1 Me in parallel with <100 pF

Maximum Crest Factor

3.0

Common Mode Rejection Ratio

>60 dB at 50 Hz or 60 Hz (1 ke 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) Voltages" located on page A3.

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.

Page 105
Image 105
Fluke 45 Decibel Reference Resistance, Maximum Crest Factor, AC + DC Voltage Accuracy, Input Impedance, Maximum Input