Test The Fuses - Fluke 175 Calibration Information Manual

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175, 177, 179
Calibration Information
Overload
Function
Protection
Volts ac
1000 V rms
Volts dc
1000 V rms
mV/
1000 V rms
Ohms/Capacitance
1000 V rms
Continuity/Diode test
1000 V rms
7
[1]
10
V-Hz maximum.
[2]
For circuits <0.3 A short circuit. 660 V for high energy circuits.
Function
Overload Protection
mA
Fused, 44/100 A, 1000 V FAST Fuse
A
Fused, 11 A, 1000 V FAST Fuse
[1] [2]
Input Range
600 mV
6 V
Volts ac
60 V
600 V
1000 V
6 V
60 V
Volts dc
600 V
1000 V
mA
AC/DC Amps
A
[1]
Maximum input for specified accuracy = 10X Range or 1000 V.
[2]
Noise at low frequency and amplitude may exceed the frequency accuracy specification.
[3]
Unspecified but usable depending on quality and amplitude of signal.
[4]
In mA and A ranges, frequency measurement is specified to 30 kHz.

Test the Fuses

To test the fuses (see Figure 1):
1.
Set the Rotary Switch to .
2.
Plug a test lead into the V terminal and touch the probe to the 400 mA (to test the 440 mA Fuse)
or 10 A terminal (to test the 11 A Fuse).
If the display shows a resistance value in the range shown in Figure 1, the fuse is good.
If the display reads , replace the fuse and test again.
If the display shows any other value, have the Product serviced. See How to Contact Fluke
earlier in this manual.
6
Input Impedance
[1]
(Nominal)
>10 M < 100 pF
>10 M < 100 pF
[2]
>10 M < 100 pF
Open Circuit Test
Voltage
[2]
<8.0 V dc
[2]
<8.0 V dc
600 mA overload for 2 minutes maximum, 10 minutes rest minimum
20 A overload for 30 seconds maximum, 10 minutes rest minimum
Frequency Counter Sensitivity
Typical Sensitivity (RMS Sine Wave)
2 Hz to 45 Hz
45 Hz to 10 kHz
[3]
Unspecified
80 mV
0.5 V
0.6 V
5 V
3.8 V
50 V
36 V
500 V
300 V
0.5 V
0.75 V
4 V
3.8 V
40 V
36 V
500 V
300 V
5 mA
4 mA
0.5 A
0.4 A
Common Mode Rejection Ratio
(1 k Unbalanced)
> 60 dB @ dc, 50 Hz or 60 Hz
>120 dB @ dc, 50 Hz or 60 Hz
>120 dB @ dc, 50 Hz or 60 Hz
Full Scale Voltage To:
600 k
50 M
<660 mV dc
<4.6 V dc
2.4 V dc
Overload
10 kHz to 20 kHz
20 kHz to 50 kHz
150 mV
1.0 V
4.1 V
39 V
320 V
1.4 V
4.3 V
39 V
320 V
4 mA
0.4 A
Normal Mode Rejection
> 60 dB @ 50 Hz or 60 Hz
> 60 dB @ 50 Hz or 60 Hz
Short Circuit Current
<1.1 mA
<1.1 mA
50 kHz to 100 kHz
400 mV
Unspecified
2.8 V
Unspecified
5.6 V
9.6 V
45 V
58 V
380 V
NA
4.0 V
Unspecified
6.6 V
13 V
45 V
58 V
380 V
NA
[4]
4 mA
NA
[4]
0.4 A
NA
[3]
[3]
[3]

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