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HP E1312A and HP E1412A Multimeter Specifications 177Appendix A
Frequency and Period Characteristics
Accuracy Specifications ±(% of reading) [1] [4]
Additional Low-Frequency Errors (% of reading) [4]
Integration Time (number PLCs)
Frequency
100 & 10 1 & 0.2 0.02
3Hz-5Hz 0 0.12 0.12
5Hz-10Hz 0 0.17 0.17
10Hz-40Hz 0 0.2 0.2
40Hz-100Hz 0 0.06 0.21
100Hz-300Hz 0 0.03 0.21
300Hz-1kHz 0 0.01 0.07
>1kHz 0 0 0.02
Measuring Characteristics
Frequency and Period
Measurement Method: Reciprocal-counting technique. AC-coupled input using the ac voltage
measurement function.
Voltage Ranges: 100 mV rms full scale to 300V rms. Auto or manual ranges.
Gate Time: 10 ms, 100 ms or 1 second.
Settling Considerations
Errors will occur when attempting to measure the frequency or period of an input following a dc offset voltage
change. The input blocking RC time constant must be allowed to adequately settle (up to 1 second) before the
most accurate measurements are possible.
Measurement Considerations
All frequency counters are susceptible to error when measuring low-voltage, low-frequency signals. Shielding
inputs from external noise pickup is critical for minimizing measurement errors.
Function Range [3] Frequency
24 Hour [2]
23°C ± 1°C
90 Day
23°C ± 5°C
1 Year
23°C ± 5°C
Temperature
Coefficient
0°C - 18°C
28°C - 55°C
Frequency,
Period
100mV
to
300V
3Hz - 5Hz
5Hz - 10Hz
10Hz - 40Hz
40Hz - 300kHz
0.10
0.05
0.03
0.006
0.10
0.05
0.03
0.01
0.10
0.05
0.03
0.01
0.005
0.005
0.001
0.001