Manual

62 Gossen Metrawatt GmbH
Insulation Measurement
(METRAHIT IM XTRA BT and METRAHIT IM E-DRIVE BT only)
1
TRMS interference voltage measurement (V
AC+DC
) with 1 M input resistance,
frequency response width: > 65 Hz ... 500 Hz, accuracy: 3% + 30 digits
2
Current for the M measurement with U
ISO
is limited to 1 mA. And thus when measuring small
insulation resistances, U
Actual
deviates from U
Set
, i.e. U
Actual
is correspondingly smaller.
Example: at R
ISO
200 k max. 200 V
Inter-Turn Short Circuit Test (only METRAHIT IM XTRA BT or METRAHIT IM
E-DRIVE BT and optional COIL adapter)
1
TRMS interference voltage measurement (V
AC+DC
) with 1 M input resistance,
frequency response width: > 65 Hz ... 500 Hz, accuracy: 3% + 30 digits
2
The time value may vary by up to 10% for different COIL adapters. This is entirely without conse-
quence if you perform measurements with the same COIL Adapter and compare them.
Inductance measuring ranges of optional COIL Adapters:
• COIL Adapter XTRA (Z270M): 10 μH to 5 H
• COIL Adapter 50 mH (Z270F): 10 μH to 50 mH
Internal Clock
Time format DD.MM.YYYY hh:mm:ss
Resolution 0.1 s (measured values timestamp)
Accuracy 1 minute per month
Temperature influence 50 ppm/K
Reference Conditions
Ambient temperature +23 C 2 K
Relative humidity 40%  75%
Meas. quantity frequency 45 Hz  65 Hz
Meas. quantity waveform Sinusoidal
Supply voltage 4.0 V 0.1 V
Influencing Quantities and Influence Error
1
With zero balancing
Frequency Influence for V
AC
/ V
AC+DC
Voltage Ranges
1
For sinusoidal input signals > 10% to 100% of the range (mV range: as of 30% of the range), at 1% to
10% of the range: f < 50 kHz, intrinsic error increased by 0.2% of the upper range limit.
2
Overload capacity of the voltage measurement input:
Power limiting: frequency x voltage max. 6 x 10
6
V x Hz @ U > 100 V
Frequency Influence for I
AC
/ I
AC+DC
Current Measuring Ranges
1
For sinusoidal input signals > 10% to 100% of the range.
1
Except for sinusoidal waveform
Measuring Range Resolution
Nominal Voltage
U
ISO
Intrinsic Uncer-
tainty at Reference
Conditions
 (% MR + d)
3 ... 1000 V
1
1V Ri=1M  3 + 3
300 k
2
0.1 k
50, 100, 250, 500, 1000 V
2 + 10
3M 1k
50, 100, 250, 500, 1000 V
2 + 10
30 M 10 k
50, 100, 250, 500, 1000 V
2 + 10
300 M 100 k
50, 100, 250, 500, 1000 V
5 + 10
3000 M 1M
250, 500, 1000 V
5 + 10
Measuring
Function
Nominal
Voltage
U
N
Open-
Circuit
Voltage
U
o
max.
Nomi-
nal
Cur-
rent I
N
Short-
Circuit
Cur-
rent I
k
Acoustic
Signal
for
Overload Capacity
Value Time
U
interference
/
M
@
U
ISO
— —— —
U > 1000
V
1000 V Cont.
M
@
U
ISO
50
100
1.2 x
U
INS
1.0 mA < 1.4
mA
U > 1000
V
1000 V 10 s
250,
500 V
1000 V
1.12 x
U
Iso
Measuring Range Resolution
Nominal Voltage
U
ISO
Intrinsic Uncer-
tainty at Reference
Conditions
 (% MR + d)
0.3 V ... 1000 V
1
Ri=1M  3+ 30 > 100 d
10.0 ... 30.9 μs 0.1 [μs]
1000 V
1% MR ± 10 d
2
31 ... 250 μs 1 [μs]
Influencing
Quantity
Sphere
of Influence
Measured Qty./
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  ... 3 M 0.5 + 5
30 M 1 + 5
mA/A 0.5 + 5
mA/A 0.8 + 5
30 nF ... 300 F2 + 5
Hz 0.2 + 5
C/F (Pt100/Pt1000) 0.5 + 5
Deviation
1
Frequency Range
300 mV range
± (...% MR + ... d)
3 V, 30 V, 300 V range
2
± (...% MR + ... d)
1000 V range
2
± (...% MR + ... d)
15 Hz ... 45 Hz, 2 + 30 2 + 30 2 + 30
> 65 Hz ... 1 kHz, 0.5 + 30 0.5 + 30 1 + 30
> 1 kHz ... 10 kHz, 2 + 30 1.5 + 30 10 + 30
> 10 kHz ... 20 kHz, 3 + 30 1.5 + 30 –
> 20 kHz ... 50 kHz, 3 + 30 5 + 30 –
> 50 kHz ... 100 kHz, 10 + 30 10 + 30 –
Influence Error
1
Frequency Range
300 A to 300 mA
± (...% MR + ... d)
1 A range
± (...% MR + ... d)
15 Hz ... 45 Hz, 2 + 30 2 + 30
> 65 Hz ... 1 kHz, 1 + 30 1 + 30
> 1 kHz ... 2 kHz, 1 + 30 1 + 30
> 2 kHz ... 5 kHz, 1 + 30 3 + 30
> 5 kHz ... 10 kHz, 5 + 30 5 + 30
Influencing
Quantity
Sphere
of Influence
Measured Qty./
Measuring Range
Influence Error
1
Crest Factor CF
1 ... 3
V, A
 1% rdg.
> 3 ... 5  3% rdg.
Influencing
Quantity
Sphere
of Influence
Measured Quantity Influence Error
Relative
Humidity
75%
3 days
instrument off
V, A, , F, Hz, C 1 x intrinsic uncertainty
Battery Voltage
—
Ditto
in intrinsic uncertainty
Included
Influencing
Quantity
Sphere of Influence
Measured Qty./
Measuring Range
Damping
Common Mode
Interference
Voltage
Interference quantity max. 1000 V V > 90 dB
Interference quantity max. 1000 V
50 Hz ... 60 Hz sinusoidal
3 V , > 90 dB
30, 300 V > 150 dB
1000 V > 150 dB
Series Mode
Interference
Voltage
Interference quantity: V ,
respective nominal value of the measuring
range,
max. 1000 V , 50 Hz ... 60 Hz
sinusoidal
V > 50 dB
Interference quantity max. 1000 V V > 50 dB