Section 4
OM6530-C1-00
19 November, 2019
4-10
The 6530 will display the suggested range of the resistor based on the selected settings.
This suggestion can be ignored but it may have a direct effect on the accuracy of the
measurement and/or the length of time for a measurement to take place. In Auto Range
mode the parameters are automatically selected up to the Max Volts setting.
4.4.3.
RESISTANCE, MANUAL RANGING
Manual ranging of the 6530 TeraOhm Bridge-Meter is more complex than using the
autoranging function. To fully understand the manual mode, Section 1.1.2 (Principle of
Operation) should be reviewed.
The manual mode permits the operator to select the test voltage, the threshold voltage and
the integration capacitor. The operator may also select these constants through the GPIB
or RS-232C remote communication link. The instrument then measures the integration
time and calculates the value of the unknown resistance. If the operator selects
inappropriate measurement constants, the full accuracy of the instrument may not be
achieved. To make a good selection, an approximate value of the unknown resistor is
required. This may be obtained from a prior knowledge or from a repetitive sequence of
measurements starting from any assumed value. The instrument works best if the
integration time is between 0.54 and 54.0 seconds, however it will work at reduced
accuracy with an integration time as short as 5.4 milliseconds or as long as 1000 seconds.
The integration capacitor value may be selected from one of 27, 270 or 2700 picofarads.
The 2700 pF capacitor is the most stable and should be used if possible.
The threshold may be 0.1 V, 1 V or 10 V. The test voltage may be selected between the
limits of (1 to 1000) V in steps that are decimal multiples of 1 and 3 of either polarity (±).
