Bk-precision 5491B - Manual User Manual download pdf (Page 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

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

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 77 78

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Bk-precision 5491B - Manual User Manual Page 15

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