Section 5: Measurement options Model 6517B Electrometer Reference Manual
5-18 6517B-901-01 Rev. C / August 2015
Display resolution
The Model 6517B can display readings at 3.5, 4.5, 5.5, or 6.5 digit resolution. The display resolution
of a reading depends on the selected resolution setting (fixed or auto). The default display resolution
for every function is 5.5 digits. The "Integration times set-by-resolution (all functions)" table below
summarizes the relationship between speed (SET-BY-RSLN setting) and the selected resolution
setting. With auto resolution selected, the instrument selects the optimum resolution for the present
speed (integration period setting). See the table "Auto resolution (all functions)" below.
The display resolution for ohms readings may be less than what was selected. For example, assume
for an ohms measurement that the measured current is 00.100 pA (20 pA range, 4½ digit resolution).
If you discount the leading zeroes, the amps reading actually has a usable resolution of 2½ digits
(0.100 pA). Since the current measurement only uses 2½ digits, the resolution of the ohms display is
also limited to 2½ digits.
Integration times set-by-resolution (all functions)
Resolution Integration time
Auto*
3.5 d
4.5 d
5.5 d
6.5 d
1.00 PLC
0.01 PLC
0.02 PLC
0.20 PLC
2.00 PLC
*With AUTO resolution selected, display resolution is set to 6.5 digits.
Auto resolution (all functions)
Resolution* Integration time
3.5 d
4.5 d
5.5 d
6.5 d
0.01 to <0.02 PLC
0.02 to <0.20 PLC
0.20 to <2.00 PLC
2.00 to 10.00 PLC
*If SET-BY-RSLN integration is selected, display resolution is 6.5 digits
and the integration time 1.0 PLC.
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