Fluke 2620A User Manual page 178

2620A/2625A
Users Manual
AC Signal Cross Talk Into an AC Voltage Channel
ACV Error Ratio =
Range
30.000 V
150.00/300.00 1.2 10
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
AC Signal Cross Talk Into an Ohms Channel
AC Frequency = 50, 60 Hz, ±0.1%
OHMS Error Ratio
For example, to find the typical effect of a 60 Hz, 100V ac signal on another channel for
the 30 k range, you would calculate: 100 X 8.4 X 10-5 = 0.008 k .
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
V x Hz Product Limit
These values assume no more than 1000 pf of capacitance between either end of the resistor (HI and LOW ) and
earth ground.
D-2
VACrms crosstalk
v Hz v Hz
-6
1.2 10
v Hz
-5
v Hz
Ohms error
1
=
VACrms crosstalk
Range
Ohms
3.0000 ke
Vrms
kOhms
4
Vrms
300.00 ke
3.0000 Me
10.000 Me
VACrms error ( )
( ) Frequency crosstalk
Ratio (worst case)
v Hz v Hz
-7
2.6 10
v Hz
-6
3.4 10
v Hz
( )
( )
Ratio (worst case)
2.4
kOhms
Vrms
-5
8.4 10
Vrms
kOhms
-3
5.6 10
Vrms
MOhms
-4
3.8 10
Vrms
MOhms
-3
1.4 10
Vrms
Typical
4
3.7 10 (V Hz)
( )
Ratio (typical)
-8
= 0.18 mV.
Ratio (typical)
30.000ke 3.1 10
Vrms
kOhms
-3
3.7 10
Vrms
MOhms
-5
3.8 10
Vrms
MOhms
4.3
Vrms
6
1.0 10 (V Hz)
-