Fluke 77 - Manual (Page 12)

77/75/23/21 English Instruction Sheet
Page 12
Overload protection for all functions and ranges: Rated voltage.
Function Input Impedance (Nominal)
L , m L , K >10 M
Ω
, <50 pF
Common Mode
Rejection Ratio
(1 k
Ω
Unbalanced)
Normal Mode Rejection
L , m L >120 dB at dc,
50 Hz, or 60 Hz >60 dB at 50 Hz or 60 Hz
K >60 dB dc to 60 Hz
Open Circuit Test
Voltage Full Scale Voltage
To 3.2 M
Ω
32 M
Ω
e <3.1 V dc
<2.8 V dc (typical) <440 mV dc
<420 mV dc
(typical) <1.4 V dc
<1.3 V dc
(typical)
Open Circuit Test
Voltage Full Scale Voltage
G R <3.1 V dc 2.0 V dc
Short Circuit Current (typical)
e
21/75:
400 µ A
23/77:
300 µ A
G R
500
µ
A 400
µ
A
G
V
F
Current (typical)
0.0 V
0.6 V
1.2 V
2.0 V
21/75:
0.5 mA
0.4 mA
0.3 mA
0.1 mA
23/77:
0.4 mA
0.3 mA
0.2 mA
0.1 mA