GW Instek GDM-8261 - Frequency and Period Characteristics; Operating Characteristics

APPENDIX
189
Frequency and Period Characteristics
Frequency Period
[3]
Range
[2]
Frequency
24 Hour
[1]
23˚C±1˚C
90 Day
23˚C±5˚C
1 Year
23˚C±5˚C
Temperature
Coefficient/˚C
[5]
100 mV
to
750 V
[4]
3Hz - 5Hz 0.1 0.1 0.1 0.005
5Hz - 10Hz 0.05 0.05 0.05 0.005
10Hz - 40Hz 0.03 0.03 0.03 0.001
40Hz - 300kHz 0.006 0.01 0.01 0.001
Accuracy Specifications: ± % of reading
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 750 V rms. Auto or
manual ranging.
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
fully settle (up to 1 sec ) 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.
Operating Characteristics
Function Digits Readings/s
Frequency,
Period
6 ½ 1
5 ½ 10
4 ½ 100
[ 1 ] Relative to calibration standards.
[ 2 ] 20% overrange on all ranges, except 750 Vac.
[ 3 ] Input > 100 mV. For 10 mV to 100 mV inputs, multiply % of reading
error x10.
[ 4 ] 750 Vac range limited to 100 kHz
[ 5 ] 0˚~18˚C & 28˚~55˚C
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