 |
|
PRECISION
RESISTANCE MEASUREMENT |
|
|
|
Model 5895 Micro ohmmeter
High Accuracy Transformer Measurement.
|
|
|
5895
Transformer Micro ohmmeter.
This Micro ohmmeter, Type 5895, has been specifically designed for the
fast measurement of the resistance of large transformers.
5895 Micro ohmmeter is
equally suitable for the measurement of any resistance where a large
amount of inductance is also present.
|
|
An integral timer and printer
are also
incorporated to enable precise readings to be
recorded at
exact and programmed time intervals.
Whilst being practical in use the
instrument also has safety features to protect both the operator and
the instrument from the hazards associated
with this type of
measurement.
This micro ohmmeter instrument is suitable for the resistance measurement requirement of
BS171 Part 2 or Part 1 IEC 76-5.
|
|
|
|
|
IEEE-488 Interface included as standard.
Speed of Measurement
Stable accurate measurements can be achieved in a fraction of the
time required than when using more traditional bridge methods. For an
average size distribution transformer the resistance reading is
available within 10 seconds
|
| Typical
Reading Times |
10 Seconds |
11KV, 220 KVA Transformer |
| 40 Seconds |
132 KV, 240 MVA Transformer |
| 100 Seconds |
400KV, 220KVA Transformer |
|
|
|
5895
Micro ohmmeter method of operation
A high test current and unique circuitry is used to rapidly drive
the core into saturation and to eliminate any oscillation of the
magnetic field, thus enabling a steady reading to be obtained quickly.
A large high intensity LED is illuminated when the instrument is in
the “Read” mode and remains ON when the instrument is switched to
“Zero” until any E.M.F.'s, generated in the transformer as the
magnetic field collapses, have fallen to a safe level for the leads to
be removed.
|
Specifications
|
| RANGE |
FULL SCALE |
RESOLUTION |
TEST CURRENT |
ACCURACY |
| 100
Ω |
180.00
Ω |
10
mΩ |
0.1 Amps |
0.1% |
| 10
Ω |
18.000
Ω |
1.0
mΩ |
0.5 amps |
0.1% |
| 1
Ω |
1.8000
Ω |
0.1
mΩ |
1.0 Amps |
0.1% |
| 100
mΩ |
180.00
mΩ |
10
µΩ |
5.0 Amps |
0.1% |
| 10
mΩ |
18.000
mΩ |
1
µΩ |
5.0 Amps |
0.1% |
| 10
mΩ |
1.8000
mΩ |
0.1
µΩ |
10 Amps |
0.2% |
| Supply |
110/120 V 50/60
Hz |
220 / 240 V 50/60
Hz |
| VA Rating |
500 VA |
| Dimensions |
460 x 460 x 150 mm |
| Net Weight |
16.5kg |
|
