Agilent Technologies 4349B, Руководство пользователя

Страница: 69 / 233

4349B
LINE Switch
P ower ON/OFF switch. In the 1 (ON) position power is applied and all operating voltages
are applied to the instrument. In the 0 (OFF) position no power is applied and no operating
voltages are applied to the instrument.
The 4349B's settings are held in backup memory for 72 hours after power is turned OFF , and
are restored as the current settings when power is turned ON again within the 72 hours period.
The backed up settings are:
T est voltage entry for each channel
Measurement parameter
A uto / Hold range
Measurement range for each channel
Measurement time
A veraging rate
Trigger mode
Trigger delay
Comparator ON / OFF state
High and low limit value for each channel
Contact check ON / OFF state
Display mode
Chassis T erminal
The Chassis terminal is tied to the instrument's chassis .
INPUT (Ch1, Ch2, Ch3, and Ch4) T erminals
These are the terminals used to connect the test leads to measure the DUT . The connector
type is triaxial, which is congured as a center conductor , an inner shield, and an outer shield.
The outer shield, connected to the ground, shields the test the test signal from noise . The
inner shield, to which nothing should be connected, guards the very small current signal, and
cuts the leakage current of the contact check signal. The center conductor , lead to the test
electrode , is the test signal path.
The 4349B has four channels , Ch1, Ch2, Ch3, and Ch4 (If your 4349B is equipped with
Option 001, 2 Channels , there are only two channels , Ch 1 and Ch 2.), and a measurement
is simultaneously performed at each channel when the 4349B is triggered to make a
measurement. The displayed channel is selected using .
Each channel has the respective settings for the following functions:
T est voltage entry
Measurement range (in Hold Range mode)
Limit values for comparator
Caution
DO NOT apply a dc voltage exceeding 6 50 V, or dc current exceeding 6 50 mA
to the UNKNOWN terminals , or the 4349B's input circuits will be destroyed.
Function Reference 3-3