NF ZM2371, Instruction Manual

Page: 227 / 255

8.7 Performance Testing
8-4 ZM2371/ZM2372
8.7 Performance Testing
Performance testing is conducted as part of preventive maintenance to prevent performance
degradation of the
ZM2371/ZM2372
. Besides, conduct it if needed after acceptance inspection,
periodic inspection or repair.
If the result of a performance testing does not meet the specifications, calibration or repair
is required. Contact NF Corporation or one of our representatives.
The performance testing should be conducted in the following conditions.

Power voltage: 100 to 230V ±10% (250V or less)

Ambient temperature: 23±5°C

Ambient humidity: 20 to 70%RH, non-condensing

Warm up: 30 min or more

Operation mode: 0: Set it with refer to
“6.1 Outline and Switching of Operation
Mode”
.
Take the following precautions when you conduct a performance testing.

The setting contents for each test item contains the descriptions of items which should be
further changed after initializing the setting.
Setting the initialize

“3.5.4 Initialization”
_ SHIFT _ + [INIT], _ 1 _
Key operation
8.7.1 Measurement Frequency Accuracy
Connection: H
CUR
terminal → Frequency counter input
Setting: After the initializing operation (
_ SHIFT _ + [INIT], _ 1 _
Key operation), 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 preset value
±
100ppm
(0.999900kHz to 1.000100kHz), it is normal.
8.7.2 Measurement Signal Level Accuracy
Connection: H
CUR
terminal → AC voltmeter input
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
120Hz 1kHz 10kHz 100kHz
Values indicated on AC voltmeter
Specification :
±
(10% + 5mVrms)
Measurement
signal level
0.1Vrms 85mVrms to 115mVrms
1Vrms 0.895 Vrms to 1.105 Vrms
5Vrms 4.495Vrms to 5.505 Vrms