 |
Current measurement |
|
|
range |
±1 mA |
|
resolution
(current display when measuring) |
1 pA |
|
resolution (recorded
data) |
0.1 pA |
|
accuracy |
0,5% of the
measured value ±1 pA after 1 hour warming up |
|
impedance |
10 k |
|
protection |
up to 100 mA respectively 1kV for 50 ms |
|
noise
suppression |
up to 10 µA eff at 50 / 60 Hz mains frequency |
|
filtering (current display when measuring) |
mean value in 1 s intervals |
|
filtering (recorded data) |
mean value in intervals increasing proportionally with the time from the voltage source switching
moment |
|
Voltage
source |
|
|
voltage
range when switched on |
+30 ...+2000 V |
|
maximum
current sourcing when switched on |
<+5 mA |
|
impedance when switched on |
<20 k |
|
impedance when switched to zero |
<0.2 |
|
current
limiting when switching cap. loads |
<±100 mA for 20 ms |
|
Capacitance
measurement |
|
|
the load capacitance is indirectly measured by computing the
ratio charge to voltage when the voltage
source is switched off for measuring of the
depolarisation current. However, the current measurement
is not impaired by a load capacitance depassing the range
listed below. |
|
load capacitance measuring range at 2 kV source voltage |
25 nF |
|
accuracy at 2 kV source voltage |
±2
% ±5 pF |
|
load capacitance measuring range at 1 kV source voltage |
50 nF |
|
accuracy at 1 kV source voltage |
±2 % ±10 pF |
|
load capacitance measuring range at 500 V source voltage |
100 nF |
|
accuracy at 500 V source voltage |
±2 % ±20 pF |
|
load capacitance measuring range at 100 V source voltage |
500 nF |
|
accuracy at 100 V source voltage |
±2 % ±100 pF |
|
Computer |
|
|
display |
15" TFT, 262'144 colours, resolution
1024x786 pixels |
|
processor |
Intel Pentium III 705 MHz |
|
memory |
SDRAM 128 MB (up to 256 MB optional) |
|
hard disk |
10 GB |
|
standard interfaces |
CD-ROM, 3½" Floppy, 2x PCMCIA, parallel
and serial ports, Ethernet |
|
options |
additional serial ports, Audio in/out,
external Monitor out |
|
Software |
|
|
operation system |
windows 98 SE |
|
measuring and control program |
installed ready to use, outputs for each
measurement one file with polarisation data, one file with
depolarisation data and one file with general measurement
descriptions |
|
standard evaluation software |
installed ready to use, easy to use, extensive
possibilities to postprocess, display, print and export the
measured data, computation of the complex capacitance in
function of frequency, computation of a lumped equivalent
circuit of the measured insulation, computation of recovery
voltages and the derived "polarisation spectrum",
computation of polarisation indexes and of insulation
resistances according to all known standards and definitions |
|
advanced evaluation software |
quality assessment of oil-paper insulation
systems quantitative determination of moisture content in
pressboard and of oil conductivity for power transformers |
|
Miscellaneous |
|
|
weight |
17,3 kg |
|
power
supply |
90 ... 260 V, 47 ... 63 Hz, <160 VA |
|
size |
514 x 185 x 428 (width x depth x height in mm) |
|
temperature (use) |
0 ... 35 °C |
|
temperature (stock) |
-10 ... 50 °C |
|
pressure |
70 ... 106 kPa |
|
humidity |
5 ... 80% non condensing |
|
acceleration |
< 2 g |
|
length of standard measurement cables |
15 m |
|
|
|
|
|
