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Section 2: Getting started
A/D CONTROLS
With this GENERAL menu item, you can control line synchronization, and enable or disable humidity
and external temperature measurements.
LINE-SYNC: Synchronizing A/D conversions with the power line frequency increases common mode
and normal mode rejection. When line cycle synchronization is enabled, the measurement is initiated
at the first positive-going zero crossing of the power line cycle after the trigger (see the figure below).
When LINE-SYNC is selected, the power line frequency is displayed and the options for line
synchronization are displayed:
ENABLED: Enables line synchronization
DISABLED: Disables line synchronization
A/D conversions assume an integration time of ≤ 1 PLC (Power Line Cycle)
Changing the state of line synchronization halts triggers and puts the instrument into idle. Press TRIG
to return to re-arm triggers.
DATA-STAMP: This menu item is used to enable or disable humidity and external temperature
measurements. The relative humidity reading is controlled by placing the cursor on HUMIDITY and
using a RANGE key to toggle between the desired state (ON or OFF). In a similar manner, external
temperature is enabled or disabled from the TEMPERATURE item.
Temperature measurements can be expressed in °C, °F or K (see
GENERAL menu to select the reading unit).
LIMIT-CTRL: The Model 6517B incorporates an A/D hardware limit circuit to detect out of range noise
spikes. When enabled (ON), the "OutOfLimit" message is displayed when an out of range noise spike
occurs. With the hardware OFF, the error message is disabled. In the OFF state, out of range spikes
may cause erroneous readings.
2-28
Figure 8: Line cycle synchronization
Model 6517B Electrometer Reference Manual
Display
(on page 8-6) of the
6517B-901-01 Rev. C / August 2015
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