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Gossen Metrawatt METRAHIT T-COM PLUS Manual

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64 GMC-I Messtechnik GmbH
Technical Data
Insulation Resistance Measurement in Selector Switch Positions (a-b) (a-E) (b-E)
1)
1)
During insulation resistance measurement (
M
Ω
@UISO
): If
ERROR is displayed as
„Error“
>> limits:
U
interference
> 10 ... 20 V and U
interference
≠ U
ISO
, Ri < 10 kΩ @ Uiso 10 V,
Ri < 100 kΩ @ Uiso 100 V
2)
Interference voltage measurement TRMS (V AC + DC) with 120 kΩ input resist-
ance, bandwidth 15 Hz ... 500 Hz, measuring error 3% + 30 Digit
Ripple voltage < 4 Vss 50 Hz, parallel capacitance < 3 μF
Interference-immune Capacitance Measurement in Selector Switch
Positions (a-b) (a-E) (b-E)
Measuring voltage U
0
= 2 Vss approx. 1 Hz, parallel resistance > 5 M
Ω
Ripple voltage < 4 Vss 50 Hz
Galvanic Signature Ascertainment in Selector Switch Positions (a-b)
Prerequisites:
Parallel resistance > 200 kΩ, parallel capacitance < 1 μF,
Ripple voltage < 4 Vss 50 Hz
and exclusively high-resistance DC voltage
Influencing Quantities and Influence Error
1)
With zero balancing
Measuring Range Resolution
Nominal Voltage
U
ISO
(U
INS
)
Intrinsic Error
under Reference
Conditions
±
(% rdg + d)
6 V ... 110 V
2)
0.1 V
Ri
approx.
120 k
Ω
3 + 30
5 ... 310.0 kΩ 0.1 kΩ 10//100 V 3 + 5
0.280 ... 3.100 MΩ 1 kΩ
10
//100 V
3 + 5
02.80 ... 31.00 MΩ 10 kΩ
10
//100 V
5 + 5
028.0 ... 310.0 MΩ 100 kΩ
10
//100 V
5 + 5
Measuring
Function
Switch
Setting
Nom.
Voltage
U
N
@100k
Open-
Circuit
Voltage
U
o
Nom.
Cur-
rent I
N
@100k
Short-
Circuit
Cur-
rent I
k
Acoustic
Signal
for
Overload Capacity
Value Time
U
interference
/
MΩ
ISO
— —— —
U > 110
V
110 V Cont.
MΩ
ISO
100 V Max.
120 V
> 1.0
mA
<1.2
mA
U > 110
V
100 V
10 s
8.7 V 11 V 0.09 < 0.260 U > 110V 100 V 10 s
Measuring
Range
Resolution
3100/1100
Digit
Intrinsic Uncertainty under
Reference Conditions
± ( ... % rdg. + ... d)
Measuring
Cycle (max.)
Overload
Capacity
300 nF 100 pF 2 + 10 2 s
600 V / PTC
max. 10 s
3 μF 1 nF 2 + 10 2 s
10 μF 10 nF 5 + 10 2 s
Signature if interference value is stable in range plus decision value
available
–50% ... +30%
approx. +60% ... +200%
not available < +20%
Influencing
Quantity
Sphere of
Influence
Measured Quantity /
Measuring Range
1)
Influence Error
(...% rdg. + ... d) / 10 K
Temperature
0 °C ... +21° C
and
+25° C ... +40° C
V 0.2 + 5
V 0.4 + 5
300 Ω ... 3 MΩ 0.5 + 5
30 MΩ 1 + 5
mA/A 0.5 + 5
mA/A 0.8 + 5
30 nF ... 300 μF1 + 5
Hz 0.2 + 5
°C/°F (Pt100/Pt1000) 0.5 + 5
… 64 …


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