28 II Ex
Calibration Information
8
Frequency Counter Sensitivity and Trigger Levels
Input Range
Minimum Sensitivity (RMS Sine Wave)
Approximate Trigger Level
(DC Voltage Function)
5 Hz – 20 kHz 0.5 Hz – 200 kHz
600 mV dc 70 mV (to 400 Hz) 70 mV (to 400 Hz) 40 mV
600 mV ac 150 mV 150 mV -
6 V 0.3 V 0.7 V 1.7 V
60 V 3 V
7 V (≤140 kHz)
4 V
600 V 30 V
70 V (≤14.0 kHz)
40 V
1000 V 100 V
200 V (≤1.4 kHz)
100 V
Duty Cycle (Vdc and mVdc)
Range Accuracy
0.0 % to 99.9 %
[1]
Within ± (0.2 % per kHz + 0.1 %) for rise times <1 μs.
[2]
[1] 0.5 Hz to 200 kHz, pulse width >2 μs. Pulse width range is determined by the frequency by the frequency of the signal.
[2] For 6 V dc range, accuracy is unspecified.
Input Characteristics
Function
Overload
Protection
Input
Impedance
(nominal)
Common Mode
Rejection Ratio
(1 kΩ unbalance)
Normal Mode Rejection
1000 V rms
10 MΩ <100 pF
>120 dB at dc, 50 Hz
or 60 Hz
>60 dB at 50 Hz or 60 Hz
1000 V rms
>120 dB at dc, 50 Hz
or 60 Hz
>60 dB at 50 Hz or 60 Hz
1000 V rms
10 MΩ <100 pF
(ac-coupled)
>60 dB, dc to 60 Hz
Open Circuit
Test Voltage
Full Scale Voltage Typical Short Circuit Current
To 6 MΩ
5 MΩ or
60 nS
600 Ω 6 kΩ 60 kΩ 600 kΩ 6 MΩ 50 MΩ
Ω
1000 V rms <7.0 V dc <1.7 V dc <1.9 V dc
500 μA 100 μA 10 μA 1 μA 0.4 μA 0.2 μA
1000 V rms <7.0 V dc 2.200 V dc 1.0 mA typical
MIN MAX Recording
Nominal Response Accuracy
100 ms to 80 %
(dc functions)
Specified accuracy ±12 counts for changes >200 ms in duration
120 ms to 80 %
(ac functions)
Specified accuracy ±40 counts for changes >350 ms and inputs >25 % of range
250 μs (peak)
[1]
Specified accuracy ±200 counts for changes >250 μs in duration
(add ±100 counts for readings over 6000 counts)
(add ±100 counts for readings in Low Pass mode)
[1] For 6 V range: 1 ms
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