36
8.2
OPERATING CONDITIONS AND TESTING
•
Environmental operating conditions:
Environmental temperature range: from -10
°
C to +50
°
C.
Relative humidity (R.H.): from 20% to 80%.
•
Storage temperature:
from -20
°
C to +60
°
C.
•
Condensation:
non-condensing environment.
•
Insulation resistance:
≥
500 M
Ω
between voltmeter input connectors short-circuited between each other and instrument frame, between
power socket and instrument frame.
≥
2 M
Ω
between voltage and current inputs.
•
Insulation voltage:
Tested to 2000 Vrms at 50 Hz for 60 seconds between voltmeter input connections (including neutral).
Tested to 3000 Vrms for 60 seconds between each connector and the instrument frame.
•
Construction standards:
Safety : IEC 1010-1, EN 61010-1, 600V cat. III
EMC : EN 50081-1, EN 50082-1, EN55022.
IEC 801-2, ENV50140 IEC 801-3, IEC 801-4
Conformity : CEE 89/336 (EMC)
CEE 73/23 - CEE 93/68 (Low Voltage Directive)
8.3
POWER REQUIREMENTS
•
External mains power:
230V
∼
±
10% 50/60 Hz or 110V
∼
±
10% 50/60 Hz
•
Consumption:
4 VA.
•
Internal battery power:
6V 940mAh N1-Cd battery with five 1,2V 940mAh elements in series.
8.4
PRIMARY MEASUREMENTS
•
Measuring method:
fixed sampling, A/D conversion.
•
Sampling frequency:
2,5 KHz.
•
Number of samples per phase:
250 (100 msec).
•
Measuring frequency:
~ 1,2 sec.
•
Automatic zero regulation:
every 1 minute.
