Section 4
OM6530-C1-00
19 November, 2019
4-20
4.5.1.
AUTORANGING - Current
The simplest technique for measuring low currents is to use the autoranging feature of the
6530:
1.
Connect the unknown current source.
2.
Select the
<Measure>
function key in the
Main Menu
3.
Select the
<Current>
function key in the
Measure Option Menu
4.
Select the
<Start>
function key to initiate the measurement cycle.
5.
The 6530 will proceed to determine the correct range and take continuous
measurements.
6.
The autoranging feature of the 6530 will track slow changes in the magnitude of the
unknown current, but if the current changes by a large step value, or if the polarity
changes, the instrument must be forced to autorange again by pressing the
<Stop>
function key to terminate the measurement and then the
<Start>
function key to initiate
the measurement cycle.
7.
Select the
<Set Up>
function key in the
Measure Option Menu
8.
Change the polarity of the expected measurement process by selecting the appropriate
polarity from the available options
<Po>, <Polarity ->.
9.
Press the front panel menu control key
<PREVIOUS>
to return menu control to the
Measure Option Menu
.
10.
Select the
<Start>
function key to initiate the measurement cycle.
4.5.2.
MANUAL RANGING - Current
Manual ranging of the 6530 TeraOhm Bridge-Meter is more complex than the
autoranging function. Reference to the Time Diagram shown in Figure 4-1 and Table 8-5
are useful when operating the 6530, especially in the manual ranging mode. In order to
manual range an approximate value of the current to be measured must be known.
Knowing the current the user must then select an integration capacitor, an integration
threshold voltage, and the shunt for the measurement. The integration capacitor value
may be selected from one of 27 pF, 270 pF or 2700 pF. The threshold may be 0.1 V, 1 V
or 10 V. The shunt can be on or off.
The selection of the capacitor, the threshold, and the shunt affects the integration time
according to the formula:
2 x C x V
threshold
x Shunt
T =
______________________________
I
Where: T is the integration time in seconds,
Содержание 6530 Series
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