Section 5: Measurement options
Model 6517B Electrometer Reference Manual
5-4
6517B-901-01 Rev. C / August 2015
Figure 56: V-source (FVMI configuration) - equivalent circuit
Ammeter LO internally connected to V-source LO through METER Connect option of CONFIG V-
source menu.
When the voltage source is connected to a capacitor, the inherent noise of the preamplifier is
amplified. This is expected performance. Adding a series resistance does not decrease the noise.
However, shunting the output of the V-source (LI to LO) with a 0.1 µF capacitor reduces this noise.
Ammeter LO to V-source LO connection
The
METER CONNECT
option of the
CONFIG V-SOURCE
menu (see the table in
VSource
configuration
(on page 5-2)) is used to make or break the internal connection between V-source LO
and ammeter LO and is summarized as follows:
1. From
the
CONFIG V-SOURCE
menu, select
METER CONNECT
to display the connection
options (on or off).
2. To connect meter LO to V-source LO, place the cursor on the
ON
option and press
ENTER
.
Conversely, to disconnect meter LO from V-source LO, place the cursor on
OFF
and press
ENTER
.
3. Use
the
EXIT
key to back out of the menu structure.
Setting voltage source value
The following information covers the V-source display, and explains how to select range and set the
voltage value.
Displaying voltage source value
With the instrument in the normal measurement display state, the programmed voltage source value
is displayed on the right hand side of the secondary display. If in another display state, you can
display the voltage source as follows:
If a multiple (NEXT) display is currently being displayed, press and hold in the
NEXT
key (or
PREV
key) until the
NEXT
display state is canceled.
If you are in a menu structure, use the
EXIT
key to back out of it.
While in the multiple (NEXT) display state, you can temporarily display the voltage source value by
pressing the
VOLTAGE SOURCE
up or down
key. The voltage source value appears on the
secondary display for three seconds, unless an editing operation is performed (
Adjusting voltage
source value
(on page 5-5)).
