Signametrics
14
2.9 Timing Measurements (SMX2042, 44)
2.9.1 Threshold DAC
•
The Threshold DAC is used for selecting a detection threshold to give optimal frequency and
timing measurements.
± (% of s volts)
Selected VAC
range [1]
Threshold range (DC
level)
Threshold
DAC
resolution
Highest allowed input
Vp-p
Typical one year setting
uncertainty
330 mV
-1.0 V to +1.0 V
0.5 mV
1.900 V
0.2% + 4 mV
3.3 V
-10.0 V to +10.0 V
5.0 mV
19.00 V
0.2% + 40 mV
33 V
-100.0 V to 100.0 V
50 mV
190.0 V
0.2% + 0.4 V
250 V
-500 V to 500 V
500 V
850.0 V
0.2% + 4 V
[1] This table should be used in conjunction with the AC volts section above.
2.9.2 Frequency and Period Measurement
ACV Mode
•
Input Impedance
1 M
Ω
with < 300 pF
Frequency Range
1 Hz - 100 Hz
100 Hz-1 kHz
1 kHz-10 kHz
10 kHz-100 kHz 100 kHz-300 kHz
Resolution
1 mHz
10 mHz
100 mHz
1 Hz
1 Hz
Uncertainty is ±0.002% of
reading ± adder shown
4 mHz
20 mHz
200 mHz
2 Hz
5 Hz
Input Signal Range [1]
10% - 200%
of range
10% - 200%
of range
10% -200%
of range
10% - 200%
of range
45% -200%
of range
[
1] Input RMS voltage required for a valid reading. Do not exceed 250 V RMS input. For example, 10% -200%
of range indicates that in the 330 mVAC range, the input voltage should be 33 mV to 660 mV RMS.
ACI Mode
•
Input Impedance
10
Ω
in the 3 mA and 30 mA ranges, 0.1
Ω
in the 330 mA and 2.5 A ranges.
Frequency Range
1 Hz - 100 Hz
100 Hz-1 kHz
1 kHz-10 kHz
10 kHz-500 kHz
Resolution
1 mHz
10 mHz
100 mHz
1 Hz
Uncertainty
0.01% ±4 mHz
0.01% ±20 mHz
0.01% ±200 mHz
0.01% ±2 Hz
Input Signal Range,
3.3 mA, 330mA Ranges
[1]
10% -500%
of range
10% - 500%
of range
10% -500%
of range
10% - 500%
of range
Input Signal Range,
33 mA, 2.5A ranges
50% -100%
of range
50% - 100%
of range
50% - 100%
of range
50% - 100%
of range
[1] Input current required to give a valid reading. For example, 10% -500% of range indicates that in the 3.3 mA
range, the input current should be 0.33 mA to 16.5 mA.
2.9.3 Duty Cycle Measurement
Frequency Range
1 Hz to 100 Hz
100 Hz to 1 kHz
1 kHz to 10 kHz
10 kHz to 100 kHz
Resolution
0.02%
0.2%
2%
20%
Typical Uncertainty is
±0.03% of reading ±
adder shown
0.03%
0.3%
3%
20%
Full scale reading
100.00 %
100.00 %
100.00 %
100.00 %
2.9.4 Pulse Width
± (% of r sec)
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