6.6 Performance Testing
6-5 ZM2376
6.6.1 Measurement Frequency Accuracy
Connection: Connect the HCUR terminal and the frequency counter input with a coaxial cable.
Setting: After the initialization (_SHIFT_
+ [INIT], and _1_
key operations),
set the measurement frequency 1kHz (initial value) and measurement signal level
1Vrms (initial value).
Measurement: Measure the frequency with the frequency counter.
Evaluation: If the values on the counter are within the following range, it is normal.
Set value ± 100ppm (0.999900 to 1.000100kHz)
Remarks: For the measurement of 1kHz, a reciprocal type counter equipped with a noise
rejection filter is suitable. If an unsuitable counter is used, it will cause a wrong
trigger or an insufficient resolution, resulting in an incorrect measurement. In such a
case, set the measurement frequency to 1MHz and execute the measurement with
gate time of 1s.
6.6.2 Measurement Signal Level Accuracy
Connection: Connect the HCUR terminal and the input terminal of AC voltmeter with a coaxial
cable. The cable length should be approx. 1m or less.
Setting: After initializing the setting, set the measurement frequency and measurement
signal level according to the contents in table stated below.
Measurement: Measure the output voltage with the AC voltmeter.
Evaluation: If the values indicated on AC voltmeter are within the specification range in table, it
is normal.
Measurement frequency 1kHz (initial value)
Values indicated on AC voltmeter
Specification: ± (8% + 5 mVrms)
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