Overload Protection For All Functions And Ranges: Rated Voltage - Fluke 21 Instruction Sheet

Overload protection for all functions and ranges: Rated voltage.

Function Input Impedance (Nominal)
, m ,
, m
>10 M , <50 pF
Common Mode
Rejection Ratio
(1 k Unbalanced)
>120 dB at dc,
50 Hz, or 60 Hz
>60 dB dc to 60 Hz
Open Circuit Test
Voltage
<3.1 V dc
<2.8 V dc (typical)
Open Circuit Test
Voltage
<3.1 V dc
Short Circuit Current (typical)
21/75:
400 A
500 A
V
F
0.0 V
0.6 V
1.2 V
2.0 V
Normal Mode Rejection
>60 dB at 50 Hz or 60 Hz
Full Scale Voltage
To 3.2 M
<440 mV dc
<420 mV dc
(typical)
Full Scale Voltage
2.0 V dc
23/77:
300 A
400 A
Current (typical)
21/75: 23/77:
0.5 mA 0.4 mA
0.4 mA 0.3 mA
0.3 mA 0.2 mA
0.1 mA 0.1 mA
32 M
<1.4 V dc
<1.3 V dc
(typical)