2620A/2625A

Users Manual

AC Signal Cross Talk Into an AC Voltage Channel

ACV Error Ratio =

Range

⎡

VACrms(error)

 

⎤

⎢

 

 

⎥

 

 

⎣VACrms(crosstalk ) × Frequency(crosstalk ) ⎦

 

Ratio (worst case)

Ratio (typical)

× ⎢

 

⎥ ×

⎢

 

 

 

⎥

× ⎢

 

 

 

⎥ ×

 

⎢

 

 

 

 

⎥

 

 

 

 

 

 

 

 

 

 

 

 

 

 

⎣v × Hz ⎦

⎣v ×

Hz ⎦

 

⎣v × Hz ⎦

 

⎣v

× Hz ⎦

 

30.000 V

1.2

× 10-6

⎢

 

 

 

⎥ 2.6

× 10-7

⎢

 

 

 

⎥

 

 

 

 

 

 

 

 

 

 

 

1.2 ×

⎣v ×

Hz ⎦

3.4 ×

 

⎣v

× Hz ⎦

 

150.00/300.00

10-5

⎢

 

 

⎥

10-6

⎢

 

⎥

 

 

 

 

 

 

 

 

 

 

 

⎣v × Hz ⎦

 

 

 

 

 

 

⎣v × Hz ⎦

For example, to find the typical effect of a 60 Hz, 220V ac signal on another channel for the 300 mV range, you would calculate: 220 X 60 X 1.4 X 10-8= 0.18 mV.

AC Signal Cross Talk Into an Ohms Channel

AC Frequency = 50, 60 Hz, ±0.1%

 

 

1

 

⎡ Ohms(error) ⎤

 

 

OHMS Error Ratio

 

= ⎢

 

 

⎥

 

 

 

 

 

 

 

 

 

 

 

⎣VACrms(crosstalk ) ⎦

 

 

Range

 

 

 

 

Ratio (worst case)

Ratio (typical)

⎡Ohms ⎤

 

 

 

 

× ⎢

 

 

 

⎥

3.0000 ke

 

 

 

 

 

 

 

⎣ Vrms ⎦

2.4 ×

 

×

30.000ke 3.1 × 10-

4 ⎡ kOhms ⎤

⎣

Vrms ⎦

⎣

Vrms ⎦

 

 

 

 

 

 

 

 

⎢

-5

⎡ kOhms⎥

⎤⎢

⎥

 

 

 

 

 

 

 

 

⎢

 

⎥

8.4 × 10

 

⎢

 

⎥

 

 

 

 

 

 

 

 

 

 

 

 

Vrms

 

 

 

 

 

 

 

 

 

 

⎣ Vrms

⎦

 

 

⎣

⎦

 

 

 

 

 

 

 

 

 

 

300.00 ke

5.6 × 10

-3

⎡ kOhms

⎤

 

 

3.7 × 10

-3⎡ kOhms ⎤

 

⎢

 

⎥

 

 

 

⎢

 

 

⎥

 

 

 

 

 

 

 

 

 

 

 

⎣

Vrms

⎦

 

 

 

 

 

 

⎣ Vrms

⎦

3.0000 Me

3.8 × 10

-4

⎡ MOhms ⎤

3.8 × 10

-5

⎡ MOhms ⎤

 

 

⎢

 

 

⎥

 

⎢

 

 

 

⎥

 

 

 

 

 

 

 

 

 

 

 

 

 

 

⎣

Vrms

 

⎦

 

 

⎣ Vrms

 

⎦

 

 

 

 

 

-3

⎡ MOhms ⎤

 

 

 

⎡ MOhms ⎤

 

10.000 Me

1.4 × 10

 

⎢

 

 

⎥

 

 

 

4.3 × ⎢

 

 

 

 

⎥

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

⎣

Vrms

 

⎦

 

 

 

⎣

Vrms ⎦

 

For example, to find the typical effect of a 60 Hz, 100V ac signal on another channel for the 30 kΩ range, you would calculate: 100 X 8.4 X 10-5 = 0.008 kΩ.

AC Signal Cross Talk Into a Frequency Channel

Frequency measurements are unaffected by cross talk as long as the voltage-frequency product is kept below the following limits:

Worst Case

Typical

 

V x Hz Product Limit

3.7 × 104 (V × Hz)

1.0 × 106 (V × Hz)

These values assume no more than 1000 pf of capacitance between either end of the resistor (HI and LOW ) and

earth ground.

D-2

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Image 178
Fluke 2625A, 2620A user manual AC Signal Cross Talk Into an AC Voltage Channel, AC Signal Cross Talk Into an Ohms Channel
Page 177 Page 179

2625A, 2620A specifications

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