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Appendices
Crosstalk Considerations
B
B-3
10.000 Me 1.4 × 10
-3
MOhms
Vrms
4.3 × 10
-4
MOhms
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.
1
These values assume no more than 1000 pf of capacitance between either end of the resistor (HI and LOW ) and
earth ground.
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 × 10
4
(V × Hz) 1.0 × 10
6
(V × Hz)
AC Signal Crosstalk into a Temperature Channel
Frequency = 50, 60 Hz
TEMPERATURE Error Ratio =
°
Cerror
VACrms crosstalk
()
()
Worst case Typical
Types J, K, E, T, N: 2.7 × 10
-3
°
C
Vrms
5.0 × 10
-4
°
C
Vrms
Types R, S, B, C: 1.1 × 10
-2
°
C
Vrms
2.0 × 10
-3
°
C
Vrms
Type PT (RTD): 8.6 × 10
-5
°
C
Vrms
No Effect