TOS8870A
SPECIFICATIONS
37
Chapter 7
SPECIFICATIONS
This Chapter provides electric and mechanical speci
fi
cations and descriptions of options.
7.1 Withstanding Voltage Tester
Table 7-1
WITHSTANDING VOLTAGE TESTER
Test Voltage
Applied AC Voltage
0 V to 2.5 kV/0 V to 5 kV (tow ranges)
Output Rating
500 VA (5 kV, 100 mA with 100 V line voltage).
*1
*1.
The heat radiation of the output section of the tester is designed to be 1/2 of the rated output, taking the size, weight,
cost, etc., into consideration. Therefore, use it within the limitations shown in Table7-2. If it is used in excess of
these limitations, the temperature of the output section rises excessively and the internal protection circuit may be
activated. In this case, cancel the test for a while and wait until the normal temperature is restored.
Waveform
AC line waveform
Voltage regulation
Better than 20% (for maximum rated load to no load, with 100 V line
voltage)
Switching
With zero-start type switch
Output Voltmeter
Scales
2.5 kV f.s / 5 kV f.s, two ranges linear scales
Class of meter
JIS Class 1
Accuracy
5
°
C to 15
°
C
15
°
C to 35
°
C
:
±
3 % f.s
:
±
1.5 % f.s (with a sine wave
*2
)
*2.
Crest factor of 1.35 to 1.41, distortion of 3% or less
Indication
Mean-value response, effective-value scale graduation
Judgment of Test Result
Judgment
Window comparator system
PASS-FAIL judgment.
Output cutoff by leak-
age current detection
FAIL judgment when leakage current larger than high limit reference
value is detected.
FAIL judgment also when leakage current smaller than low limit ref-
erence value is detected.
When FAIL judgment is made, output is cutoff and FAIL alarm is gen-
erated.
If no FAIL judgment is made after preset period has elapsed, PASS
signal is generated.
High limit reference value
(CUTOFF CURRENT)
0.5/1/2/4/8/10/100 mA (7 values)
By combinations of above values, a range of 0.5 mA to 25.5 mA can
be covered in 0.5 mA steps.
Low limit reference value
(LOWER REFERENCE)
0 to one-half of high limit reference values
(continuously variable)
Accuracy of judgment
*3
*3.
The current which
fl
ows due to stray capacitances of the output circuit and leadwires causes an error. The overall
accuracy of judgement is the above-mentioned accuracy of judgement plus a factor caused by this current. Typical
values of this type of currents are shown in the Table7-3. Note that, when a test is made with a high voltage and
high sensitivity, the current which
fl
ows through the stray capacitances may become larger than the preset low limit
reference value and low limit judgement may become unavailable.
±
5 % of high limit
±
20 % of low limit reference value (one-half of high limit reference
values at maximum counterclockwise). (Other are non-calibrated.)
Judging method
Absolute value of leakage current is integrated and compared with
preset limit reference value
Calibration
Calibrated with rms value of sine wave, using a pure resistance load.
No-load output voltage
need for detection
*4
*4.
When making an FAIL judgement test with the output terminals shorted, a certain level of no-load output voltage is
needed due to the internal resistance of the output circuit. The voltages shown here are this type of output voltages.
2.5 kV range
Approx. 450 V when set at 100 mA
5 kV range
Approx. 550 V when set at 100 mA
Test time
Timer :0.2 s to 99.9 s (
×
0.1 range)
±
50 ms
1 s to 999 s (
×
1 range)
±
0.5 s
Terminals
Terminals for monitoring of leakage current
