NF FRA51602, Instruction Manual

Page: 52 / 286

3.2 Input and output connectors
3
-
14
FRA 51602
This rating is for when there is no transient overvoltage. For measurements in mains circuits were
transient overvoltages can occur, use the MEASUREMENT CATEGORY specifications described
previously.
！
WARNING
Do not apply voltages that exceed the rated isolation voltage. Doing so may result in
insulation breakdown and risk of electrical shock. Damage to the instrument may also
result.
！
CAUTION
Applying an external signal to the OSC output connector will damage the internal
circuits. Never input a signal to the OSC output connector.
■ Ratings for isolation between CH1, CH2, and OSC
The analyzer input connectors (
CH1
and
CH2
) and the oscillator output connector (
OSC
) are all
mutually isolated.
Isolation voltage : 600 V CAT II or 300 V CAT III (between
CH1
,
CH2
, and
OSC
, to BNC ground)
Figure 3-8 Isolation withstand voltage between signal connectors
The maximum isolation voltage is restricted according to the frequency as described below. Applying
high voltages at high frequencies may result in a large AC current flowing in floating capacitance within
the instrument, creating a risk of damage to the equipment. Be certain to use the instrument at voltages
below the rated isolation voltage.
○ Maximum isolation voltage by frequency
Below 45 Hz : 600 Vpk (AC+DC)
45 Hz to 100 kHz : 600 Vrms
100 kHz to 2 MHz : 600 Vrms (AC) × 100 ÷ F, where F is frequency in kHz
For frequencies of 45 Hz or higher, the RMS voltage including DC is 600 Vrms or less and the peak
voltage is 849 Vpk or less.
OSC CH1 CH2
600 V CATII
300 V CATIII
600 V CATII
300 V CATIII
600 V CATII
300 V CATIII