Selecting The Input Terminals - Agilent Technologies 3458A User Manual

Selecting the Input
Terminals
WARNING
Caution
50 Chapter 3 Configuring for Measurements
the CALSTR command; this can be read later using the CALSTR?
command.) The following example shows how to use the TEMP? command
to monitor the multimeter's internal temperature (in degrees Celsius).
10 OUTPUT 722;"TEMP?"
20 ENTER 722;A
30 PRINT A
40 END
The autocal constants are stored in continuous memory (they remain intact
when power is removed). Therefore, it is not necessary to perform autocal
simply because power has been cycled.
The multimeter has both front and rear terminals for measurement
connections. The front panel Terminals switch allows you to select between
the two (depressed = Rear, out = Front). You cannot select the input
terminals from remote. The measurement connection illustrations in this
chapter show the front terminal connections only. For rear terminal
connections, connect each wire to the similarly labeled rear terminal. We
recommend high impedance, low dielectric absorption cables for all
measurement connections.
Only qualified, service trained personnel who are aware of the
hazards involved should remove or install the multimeter or
connect wiring to the multimeter. Disconnect the multimeter's
power cord before removing any covers, changing the line
voltage selector switches, or installing or changing the line
power fuse.
Measuring high voltage is always hazardous. All multimeter
input terminals (both front and rear) must be considered as
hazardous whenever inputs in excess of 42V are connected to
any terminal. Regard all terminals as being at the same
potential as the highest voltage applied to any terminal.
Agilent recommends that the wiring installer attach a label to
any wiring having hazardous voltages. This label should be as
close to the input terminals as possible and should be an eye
catching color, such as red or yellow. Clearly indicate on the
label that high voltages may be present.
The current input terminals (I) are rated at
maximum non-destructive input of <1.25A RMS. Current inputs
are fuse protected. The multimeter's input voltage ratings are:
HI to LO Input:
Table 9: Input Ratings
Rated Input
± l000V peak
±
1.5A peak with a
Maximum Non-
Destructive Input
±1200V peak