B&K Precision 5491B - Manual - Manual (Page 15)

15
Figure 2-5 Input terminals
Table 2-1 Input protection Limits
Function Input Terminals Maximum Allowable Input
DCV to COM 1010V DC
ACV,HZ to COM 757.5V AC RMS,1000V Peak
mA, HZ 500mA to COM 200mA (Model 5491B: 500 mA) DC
or AC RMS
20A,HZ 20A to COM 20A DC or AC RMS
Ω to COM 500V DC or AC RMS
, to COM 500V DC or AC RMS
All functions Any terminals to earth 1000V DC or 1000V peak AC
2.6.3 Power-up Sequence
On power-up, the multimeter performs self-tests on its EPROM and RAM and lights all segments and
annunciators for about 1 second. If a failure is detected, the instrument momentarily displays an error
message and the ERR annunciator turns on.
If the instrument passes self-tests, the firmware revision will be displayed momentarily.
2.6.4 High Energy Circuit Safety Precautions
To optimize safety when measuring voltage in high energy distribution circuits, read and use the
directions in the following.
When making measurements in high energy circuits, use test leads and accessories that meet the
following requirements:
 Test leads and accessories must be fully insulated.
 Only use test leads that can be connected to the circuit (e.g., alligator clips, spade lugs, etc.) for
Input-High terminal for Volts, ohms, Hz, period, diode and
continuity measurements
2 mA-200 mA for 2831E, 5 mA-500 mA for model 5491B
range DC/AC current input terminal for DC/AC current
measurements
Common terminal
2 A (5 A for model 5491B) and 20 A range current input
terminal for DC/AC current measurement
T1AL/250 V type fuse for the mA measurement range