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
μ
s.
[1] 0.5 Hz to 200 kHz, pulse width >2
μ
s. Pulse width range is determined by the frequency by the frequency of the signal.
Input Characteristics
Function
Overload
Protection
Input
Impedance
(nominal)
Common Mode
Rejection Ratio
(1 k
Ω
unbalance)
Normal Mode Rejection
L
1000 V rms
10 M
Ω
<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
K
1000 V rms 10 M
Ω
< 100 pF
(ac-coupled)
> 60 dB, dc to 60 Hz
Open Circuit
Test Voltage
Full Scale Voltage
Typical Short Circuit Current
To 6 M
Ω
5 M
Ω
or
60 nS
600
Ω
6 k
Ω
60
k
Ω
600
k
Ω
6
M
Ω
50 M
Ω
Ω
1000 V rms
<7.0 V dc
<1.7 V dc
<1.9 V dc 500
μ
A 100
μ
A 10
μ
A 1
μ
A 0.4
μ
A 0.2
μ
A
G
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
μ
s (peak)
[1]
Specified accuracy
±
100 counts for changes >250
μ
s 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
